Verify it indeed has vacuum - I have seen the ports blocked solid from PCV carbon gunk buildup requiring removal of the TBI to clean out. Mainly working on it due to oil leaks and was "taught" about the PCV's role in reducing oil leaks. (PCV was plugged solid in the TBI.) Lets say your injectors do open at the higher pressure. If your oil level is correct and you are making sure that the oil type is correct, the most common cause of low oil pressure is too much dirt in the pickup to the oil pump. Normally the oil pump is taking the oil from the bottom of the oil pan from a pipe. Before that pipe, there is often a net that will prevent any big metal pieces to go ... The GM TBI (Throttle Body Injection) system uses a pair of low pressure fuel injectors mounted above the throttle body opening. Unlike a port fuel injection system, that sprays fuel into the intake manifold runner just above the intake valve, the injectors in this system spray fuel directly into the throttle body above the throttle plate. Could just be the sender. My gauge acts crazy after an oil change...it will jump around for a few miles then be back to normal. Mine shows 30-40 lbs at idle and increases with revs. Jan 12, 2019 · Any and all of the other reason that create a high oil pressure situation depend on the pressure relief valve to reduce the oil pressure coming out of the pump. If the oil pressure is reading high, then the pressure relief valve is not relieving the excess pressure as it should. Many of the common initiating causes are listed below. I recently bought a 2006 with about 148k. I did an oil change as soon as I bought just to be good. I have started noticing that when the engine gets up to temp, and I come to a stop and I idle, that the oil pressure drops down to the bottom of the gauge almost into the "Low" section but the light doesn't come on. Oct 21, 2009 · try bypassing the oil pressure switch on the back of the block behind the distributor, if there oil pressure switch goes bad it will do this. had one that drove me nuts trying to fix it then figured out I had to buy a book and low and behold thee it was 3 wire oil pressure switch you can't see between the engine and fire wall just behind the distributor and costs 8 bucks to buy new. Apr 25, 2015 · I just put a new oil pump in my 350 after i chromed out the engine and new intake. i have high oil pressure now . i have a mechanical pressure gauge high oil pressure in my sbc 350 (idle, best, engine, sensor) - Automotive -Sports cars, sedans, coupes, SUVs, trucks, motorcycles, tickets, dealers, repairs, gasoline, drivers... 95 Chevy 350 TBI acceleration problems Results 1 to 8 of 8 Discuss 95 Chevy 350 TBI acceleration problems in the alt.trucks.chevy forum at Car Dealer Forums; Symptoms are as follows: When first started it runs fine for a few seconds then ... Low idle oil pressure is a common issue on 350's like your 10# at idle. I've seen a lot of folks get tied up in their underwear over it and they have spent a lot of time and money trying to fix something thats not broken. Oil flow is the more important issue, if your pressure rises 10# per thousand rpm I would leave it alone and just drive it. If your oil level is correct and you are making sure that the oil type is correct, the most common cause of low oil pressure is too much dirt in the pickup to the oil pump. Normally the oil pump is taking the oil from the bottom of the oil pan from a pipe. Before that pipe, there is often a net that will prevent any big metal pieces to go ... Nov 17, 2016 · The minimum oil pressure at idle is only 5 psi (34.5 kpa). The minimum oil pressure at 2000 engine rpms is 35 psi (241 kpa). Both of these pressures are using a mechanical oil pressure gauge that can measure the low 5 psi readings. Your oil pressure gauge should not be more than a 100 psi gauge or the readings may not be accurate. Engine Building & Overhauling - Low to no oil pressure on a small block 350 - Okay guys, i have searched through tons of oil pressure forums on here and havent found my answer. so i have a 350 that was just rebuilt. i have low to no oil pressure unless its cold and it shows 15-20 psi. but when it warms up some it... My 8.3 Cummins has low oil pressure at hot idle . I installed a mechanical gauge on the engine to make sure that it wasn't the dash gauge. It idles at around 8 to 10 Lbs. when hot . As soon as you bring up the idle to around 900 RPM ,it goes up to around 20 Lbs. and increases with RPM. If plug 3 is missing you will have very low oil pressure (near zero) at all times. If hole E was plugged you would have excessively high oil pressure with cold oil or any time the engine is above idle speed. Plug 5 missing might not cause any problem, as it is a low pressure port and may be covered by the pan gasket. My oil pressure on start up is about 15-20 psi and at cruising speed is about 45 psi. After the engine is hot, and I go to idle, the oil pressure drops to 4-5 psi, and the alarm goes off. Increasing the rpms to 1000 brings the pressure back up to 10-15 and the alarm stops. Dec 25, 2010 · Need help if anyone has any good advice on a 78 Camaro Z28 350's oil pressure. When the car is first cranked it shows about a 60 psi, but when the car gets to operating temperature, around 200 degrees F, at idle the oil pressure drops rapidly and steadies at about a 13-15 psi. Per my dash gauge I'm seeing (once warmed up) only 20 psi at idle, up to 30-35 in low speed driving, about 40 on the highway. Seems low to me, what do people usually see for oil pressure? My 2010 has 55,000 miles and so far I don't see it burning any oil at all, but have only owned it for about 6,000 miles. Oct 14, 2013 at 10:16 AM #2. Hey guys the 350 in my car has very very low oil pressure at hot idle. Cold idle its very good. Hot idle in gear is literally sitting just over 0 on the gauge. In neutral it comes up to like 4 or 5psi, then when cruising it looks ok. Just slightly under 20psi. The annoying thing is that it doesn't have many miles since rebuilt. - has no/low oil pressure at idle - when you start the truck it shows no psi, give it a slight (100-200 rpm) rev and the pressure comes right up on the idiot light gauge. Pressure stays up until the truck gets hot then it loses PSI again but only at idle - replaced the oil psi sender behind the oil filter to rule it out - problem persists Verify it indeed has vacuum - I have seen the ports blocked solid from PCV carbon gunk buildup requiring removal of the TBI to clean out. Mainly working on it due to oil leaks and was "taught" about the PCV's role in reducing oil leaks. (PCV was plugged solid in the TBI.) Lets say your injectors do open at the higher pressure. What temperature to season cast ironI bought a 94 chevy 350 tbi and finnally got it to idle right. i rebuilt the top end and have replaced my entire ignition system except the ignition coil. it idles great but if i put it in any gear except neutral and park it will start shuddering badly. i have no idea what to do except map sensor. this is my first car and first big project Jan 25, 2010 · I own a 1987 Chevrolet R10 pickup with a 5.7 TBI, the L05 I believe. It has the automatic 3-speed with overdrive. Despite 190,000 miles on the clock she has run perfectly until now, although quite heavy on gas. Over the last few months I have experienced a multitude of running problems, including fuel mileage down from 12-15 mpg to the very low single digits. Here is a list of current symptoms ... MERCRUISER HORN WARNING SYSTEMS Page 4 / 10 90-898301003 JUNE 2007 1995–Current 5.7L, 7.4L, 8.2L Inboard/Tow Sport Carbureted Engines Models 1995–Current Inboard/Tow Sport Carbureted Engines 5.7L 7.4L 8.2L Horn Output Possible Cause Corrective Action Engine Usage Available For Consumer Solid horn on key on, but goes off when oil pressure switch Jan 15, 2003 · just a general rule of thumb,15lb of oil pressure per 1000 rpms.15 at idle is ok. The block and heads are original but the block was bored .20 over. Although engine has new internal parts we used parts that resembled original parts. Like a solid lifter cam. The instrument gauges on the floor are new. When the oil pressure drops at idle the temperature gauge goes up, not in the red, which makes sense to me. The block and heads are original but the block was bored .20 over. Although engine has new internal parts we used parts that resembled original parts. Like a solid lifter cam. The instrument gauges on the floor are new. When the oil pressure drops at idle the temperature gauge goes up, not in the red, which makes sense to me. Mar 24, 2012 · Hi I have a 1994 k1500 350 tbi and have been chasing a problem with intermittent rough idle and low idle in gear runs fine when reved and going down the road and I can also hear a quiet muffled backfire through the exhaust at idle that is also intermittent. Help would be greatly appreciated Dec 25, 2010 · Need help if anyone has any good advice on a 78 Camaro Z28 350's oil pressure. When the car is first cranked it shows about a 60 psi, but when the car gets to operating temperature, around 200 degrees F, at idle the oil pressure drops rapidly and steadies at about a 13-15 psi. idle speed” is. We will see how this compares to what the “target idle speed” is set at in the chip. The “minimum idle speed” must be less than the “target idle speed”, otherwise, during normal operation, the IAC pintle could bottom out on the air passage seat of the TBI, and damage will occur to the stepper motor of the IAC control. Chevy 350s used as crate replacement, engines or have been sitting for a long period during a restoration project, may develop a tapping or clicking sound once the engine is running. This is usually due to the oil galleys being blocked or restricted, or due to low oil pressure. The galleys should be cleared and the oil pump replaced. Today's ... Other problems included: low oil pressure. The oil pressure warning light was coming on at idle after the engine heated up. To combat this, first I used 20w-50 oil to provide more viscosity at high temperatures. Then, I changed the oil every 200 miles about 4 times. Every time I changed the oil, more old sludge and dirt came out. If pressure is low at idle, even if it still acceptable, it means the engine is getting well worn. If it has good compression and doesn't smoke, you might be able to replace bearings and oil pump, and be all set. Those can be done without removing the engine from the car. Materials would be less than $200.00 if you can do it yourself. Apr 25, 2015 · I just put a new oil pump in my 350 after i chromed out the engine and new intake. i have high oil pressure now . i have a mechanical pressure gauge high oil pressure in my sbc 350 (idle, best, engine, sensor) - Automotive -Sports cars, sedans, coupes, SUVs, trucks, motorcycles, tickets, dealers, repairs, gasoline, drivers... Apr 25, 2015 · I just put a new oil pump in my 350 after i chromed out the engine and new intake. i have high oil pressure now . i have a mechanical pressure gauge high oil pressure in my sbc 350 (idle, best, engine, sensor) - Automotive -Sports cars, sedans, coupes, SUVs, trucks, motorcycles, tickets, dealers, repairs, gasoline, drivers... Jul 13, 2015 · About 30 miles later I let up off the throttle and noticed that the oil pressure looked like it dropped to zero. It was a warm day and the heat from the motor was real high. I was afraid that I had a leak and lost oil. I checked the oil and it was still full. At 70 mph the oil pressure went up to about 15 psi. The idle pressure was about 6 psi. You don't state what the oil weight is that you are using. You may want to verify what weight is recommended, since you describe it as a stock 350. For comparison, a relative had a stock 350 which had a 10# idle pressure new, and i was amazed that he never had trouble using it as a farm truck and now has over 100k miles. Mar 27, 2007 · Chevy is known for low oil pressure. But for this 4 banger, I was wondering, cause as soon as the needle touches 210, the pressure will drop to 0, but the light doesn't come on, and I have let it idle and it never starts knocking or ticking. Low oil pressure (5-10 psi) when the engine is warm and idling is fairly typical on a small block. As long as the pressure picks up when you open the throttle it's usually ok. Especially if you have 50 psi cold. If the pressure does not pick up when you open the throttle, then you have a problem. Per my dash gauge I'm seeing (once warmed up) only 20 psi at idle, up to 30-35 in low speed driving, about 40 on the highway. Seems low to me, what do people usually see for oil pressure? My 2010 has 55,000 miles and so far I don't see it burning any oil at all, but have only owned it for about 6,000 miles. Oct 14, 2013 at 10:16 AM #2. So 10psi near idle, and going up from there. That said, a recently rebuilt or healthy V8 motor should give you much more pressure than that. Like bill said, 30psi at idle, and i think i'm at 60psi when i lay on it or and up to RPM cruising speed. THe long crank seems to indicate HPOP issue but the no oil pressure at idle indicates a restriction of either the oil filter\bypass valve hung open not allowing pressure to build or a restricted oil pickup screen in oil pan. Can rule out an oil pressure sensor either since they are known to have problems. Low idle oil pressure is a common issue on 350's like your 10# at idle. I've seen a lot of folks get tied up in their underwear over it and they have spent a lot of time and money trying to fix something thats not broken. Oil flow is the more important issue, if your pressure rises 10# per thousand rpm I would leave it alone and just drive it. I recently bought a 2006 with about 148k. I did an oil change as soon as I bought just to be good. I have started noticing that when the engine gets up to temp, and I come to a stop and I idle, that the oil pressure drops down to the bottom of the gauge almost into the "Low" section but the light doesn't come on. MERCRUISER HORN WARNING SYSTEMS Page 4 / 10 90-898301003 JUNE 2007 1995–Current 5.7L, 7.4L, 8.2L Inboard/Tow Sport Carbureted Engines Models 1995–Current Inboard/Tow Sport Carbureted Engines 5.7L 7.4L 8.2L Horn Output Possible Cause Corrective Action Engine Usage Available For Consumer Solid horn on key on, but goes off when oil pressure switch Oct 21, 2009 · try bypassing the oil pressure switch on the back of the block behind the distributor, if there oil pressure switch goes bad it will do this. had one that drove me nuts trying to fix it then figured out I had to buy a book and low and behold thee it was 3 wire oil pressure switch you can't see between the engine and fire wall just behind the distributor and costs 8 bucks to buy new. Apr 25, 2015 · I just put a new oil pump in my 350 after i chromed out the engine and new intake. i have high oil pressure now . i have a mechanical pressure gauge high oil pressure in my sbc 350 (idle, best, engine, sensor) - Automotive -Sports cars, sedans, coupes, SUVs, trucks, motorcycles, tickets, dealers, repairs, gasoline, drivers... chevy 350 low oil pressure whats the deal? well i start the motor and i get 40 psi i drive for about 20 min and pressure just keeps dropping i drive for a hour stop a light i look im getting 5-3 psi some times 10 i have to stay on the gas to keep pressure to keep it up! im running 10 w 30 new oil,new filiter? whats the deal Fuel pressure on a TBI unit should stay constant under all throttle conditions. There should be less than 1 psi of pressure difference from idle to WOT operation of the TBI unit. A pressure drop of more than 1 psi under these conditions indicates an issue with the fuel delivery system. Apr 25, 2015 · I just put a new oil pump in my 350 after i chromed out the engine and new intake. i have high oil pressure now . i have a mechanical pressure gauge high oil pressure in my sbc 350 (idle, best, engine, sensor) - Automotive -Sports cars, sedans, coupes, SUVs, trucks, motorcycles, tickets, dealers, repairs, gasoline, drivers... Mine ran at 20+psi on hot 800rpm idle (when the accusump was empty) and went to 65 psi max. the idle worried me (especially as I had set the low oil pressure warning at 25psi) but the experts told ... Chevy 350s used as crate replacement, engines or have been sitting for a long period during a restoration project, may develop a tapping or clicking sound once the engine is running. This is usually due to the oil galleys being blocked or restricted, or due to low oil pressure. The galleys should be cleared and the oil pump replaced. Today's ... Re: Low Oil Pressure 1994 GMC my 94 with the 305 is 60 when cold,40-55 when warm and around 30-40 at idle like when stopping at red lights.kind of freaked me out too when i first bought it and i got on here and the good guys on here said it was a normal thing in these trucks.thank goodness for you experts.keep up the good work. Nov 17, 2016 · The minimum oil pressure at idle is only 5 psi (34.5 kpa). The minimum oil pressure at 2000 engine rpms is 35 psi (241 kpa). Both of these pressures are using a mechanical oil pressure gauge that can measure the low 5 psi readings. Your oil pressure gauge should not be more than a 100 psi gauge or the readings may not be accurate. Oct 09, 2013 · Oil pressure drop after warmup on the 95 Chevrolet G20 van! what could it be? ... Chevy Tbi running rich problem solving - Duration: ... Low Oil Pressure at Idle SOLVED - Dodge - Jeep ... THe long crank seems to indicate HPOP issue but the no oil pressure at idle indicates a restriction of either the oil filter\bypass valve hung open not allowing pressure to build or a restricted oil pickup screen in oil pan. Can rule out an oil pressure sensor either since they are known to have problems. idle speed” is. We will see how this compares to what the “target idle speed” is set at in the chip. The “minimum idle speed” must be less than the “target idle speed”, otherwise, during normal operation, the IAC pintle could bottom out on the air passage seat of the TBI, and damage will occur to the stepper motor of the IAC control. No need to bleed air with it being that close. While Merc does indicate a minimum oil pressure of around 4psi, this should only be seen after coming off plane with the engine hot. After a short time of idling, the pressure should start coming up a bit more. Something isn't right because the pressure goes from 65 to 3, that is a very large swing. Bad esn fix t mobileDec 25, 2010 · Need help if anyone has any good advice on a 78 Camaro Z28 350's oil pressure. When the car is first cranked it shows about a 60 psi, but when the car gets to operating temperature, around 200 degrees F, at idle the oil pressure drops rapidly and steadies at about a 13-15 psi. Fuel pressure on a TBI unit should stay constant under all throttle conditions. There should be less than 1 psi of pressure difference from idle to WOT operation of the TBI unit. A pressure drop of more than 1 psi under these conditions indicates an issue with the fuel delivery system. Oil pressure is controlled by a Injection actuator pressure sensor and valve. Oil pressure goes as high as 3000 psi. This oil pressure controls the fuel injectors fuel flow. The engine computer controls and regulates this do to the fuel schedules programmed. The computer will shut down the engine due to oil, low oil, low pressure. If your oil level is correct and you are making sure that the oil type is correct, the most common cause of low oil pressure is too much dirt in the pickup to the oil pump. Normally the oil pump is taking the oil from the bottom of the oil pan from a pipe. Before that pipe, there is often a net that will prevent any big metal pieces to go ... Apr 25, 2015 · I just put a new oil pump in my 350 after i chromed out the engine and new intake. i have high oil pressure now . i have a mechanical pressure gauge high oil pressure in my sbc 350 (idle, best, engine, sensor) - Automotive -Sports cars, sedans, coupes, SUVs, trucks, motorcycles, tickets, dealers, repairs, gasoline, drivers... I know, everyone is probably saying "Oh man, not another low oil pressure thread" but this has a solution. I recently rebuilt my engine and have yet to put many miles on it. (working on it little by little to get it how i like) I bought a full rebuilt kit for it. including new oil pump. When my engine gets warm, my oil pressure drops to 5 lbs. Used toro mower decks for sale