the car runs like shit when it warms up - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-08-2007, 07:38 PM   #11
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I tested the pressure and got 41 psi with the key on and then I started the car and got 37 psi. This seems about right to me.
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Old 08-09-2007, 02:14 AM   #12
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I guess I'm going to try to clean the TB and sea foam the engine. Would I be able to reuse the TB gasket and apply some gasket sealant around it?
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Old 08-09-2007, 02:33 AM   #13
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I was searching around and found a topic about the oil pressure sender unit.

Quote:
Originally Posted by willwren
Ted is right on the money. My Oil Pressure is starting to do the same thing on the Zilla. I know it'* the sender. But as Ted pointed out, the fuel delivery depends on the oil pressure. This was done to protect the engine. If the oil pressure drops (due to a bad sender or some mechanical failure), it will cut off the fuel to protect the motor.

Don't ignore it.
Is it true that fuel delivery is depended on the oil pressure?
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Old 08-09-2007, 09:12 AM   #14
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Not 100%.

Oil and fuel pressure are not directly related. There are parameters that if your oil LEVEL sensor reads empty that you should have no fuel. I know for a fact on my 97 that I can run at 3,000 rpms with only 5psi of oil pressure. Which we all know is smoked bearing land.
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Old 08-09-2007, 09:35 AM   #15
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Have you ever replaced the fuel pressure regulator? They are famous for failing on theses cars.
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Old 08-09-2007, 10:59 AM   #16
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If you read above, Barry, you'll see he already checked his fuel pressure (which is done after the FPR), although I'd like to see him do it again at idle, and pull the vacuum line off the FPR and record that pressure too.
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Old 08-09-2007, 02:11 PM   #17
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I did read the above, but my son'* '97 SE was hard starting and had ok fuel pressure. Took it to the shop and they replaced regulator and all was fine. I actually think there was a recall or TSB on the regulators.
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Old 08-09-2007, 02:22 PM   #18
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The regulator I have now is from a junk yard, I got 2 of them from there, but one of the screens was ruptured I don't know if I put the wrong one in the car. I'm going to look at my FPR. I'm going to have to get in contact with my friend again for that fuel pressure gauge again.

I forgot that another reason why my car is running bad in hot weather could be that I'm low on oil. It'* below the bottom notch. I was going to seafoam and change the oil + ring seal and spark plugs after I did my heavy duty TB cleaning, but haven't got around to it.
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Old 08-09-2007, 02:36 PM   #19
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Quote:
Originally Posted by Barry
I did read the above, but my son'* '97 SE was hard starting and had ok fuel pressure. Took it to the shop and they replaced regulator and all was fine. I actually think there was a recall or TSB on the regulators.
The recall was for 1997 L36'* only. The topic author doesn't even use the same FPR.
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Old 08-09-2007, 03:59 PM   #20
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Quote:
Originally Posted by trigga_b
I forgot that another reason why my car is running bad in hot weather could be that I'm low on oil. It'* below the bottom notch. I was going to seafoam and change the oil + ring seal and spark plugs after I did my heavy duty TB cleaning, but haven't got around to it.
What is an oil + ring seal?

Remember when I said you were killing me by not checking the oil and not making sure you had any? I was wrong.. you are killing your motor. Congrats... I hope you take better care of the next one.
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