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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 11-03-2004, 09:57 PM   #1
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Okay, I have been trying to diagnose a problem I have been having with the motor sputtering and a roiugh idle.

I was told to disconnect the TPS and see if it runs different.

I did this. No difference in the way it ran.

Only one difference though. My check engine light has NEVER come o before. It was on this time. When I hooked it back up. Check engine light went off.

If the TPS was bad, wouldn't the light have come on before? Oh have I found my problem?

1994 Bonneville SE

To go more into detial about the problem........

If I drive around and only press the gas pedal the minimum amount, I have no problems. It does not sputter or jerk. If I give it moderate to full throttle, It will surge and it is very oblvious that it is only getting 50% power at most.

In nuetral, I can slowly rev the motor and it will build RPMS without sputtering. But even in nuetral, if I quickly press the gas pedal down, it will sputter again.

I am assuming this is an OBD1 computer. How much do the readers cost?

p.*. - I have also unpluged the EGR valve and did not notice a difference in the way it runs.

p.*.*. - When I first start the car, it is very noticable that it does not sputter as bad and has a lot more power. But it still surges, just gets worse as it comes up to temp.
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Old 11-03-2004, 10:13 PM   #2
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Could be a bad fuel pressure regulator, bad injector, or maybe just a plugged fuel filter. When was the last time you changed the fuel filter?
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Old 11-03-2004, 10:17 PM   #3
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sorry, I changed it about a month ago.

the problem did not start until after it set undriven for about 2 1/2 weeks. I had to put a tranny in it.

I did not have to hook or unhook anything up when I did that. Nothing but the tranny itself ofcourse....In fact, I drove it to the shop to put the tranny in, which I did myself, what a pain...... and I noticed it on the way to the shop.
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Old 11-03-2004, 10:18 PM   #4
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I take it that the fuel pressure regulator is the small cylinder thing attached to the fuel rail that has a vacuum hose coming straight out of the top. I unplugged that vacuum hose and it did not change the way the car ran.
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Old 11-03-2004, 10:29 PM   #5
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Do you have a fuel pressure gauge? Screw it in to the schroeder valve on the fuel rail. I believe that if you unplug the vacuum line to the Fuel pressure regulator, the pressure should go up.
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Old 11-03-2004, 10:53 PM   #6
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Check the FPR by removing the vacuum hose with the engine running. If fuel leaks out of the nipple, replace it.
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