96 Bonne rough idle, No codes - Page 4 - 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 02-02-2011, 09:40 PM   #31
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I would just replace it. But if your smelling gas, then the diaphragm is leaking.
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Old 02-03-2011, 08:12 AM   #32
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Hey buddy Ive read through all the convo in here and though to suggest to look into a camshaft position sensor. These things don't usually go out fast, die very slowly and worthen the cars mpg'* w them. Once it gets to a bad territory where're the signal flactuation becomes way off then the codes show up. Check into it, it migh j be it. It migh be slowly lying to PCU and messing up you mpg. Also usually when they do get bad I mean toward check engine light bad, you would knotice a half sec less throtle response, specially on idle. Give it a sudden gas on idle see if it stumbles a bit or tiny atleast before raising rpm. Also if this is the case, sometimes it might not be exactly the sensor itself but rather it'* magnetic pick up, reluctor or whatever they call it. On bonnie both of the sensor and thr pick up should be behind the chain cover. Hope this helps somewhat
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Old 02-03-2011, 08:07 PM   #33
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Thanks bud. This does help. Im pretty sure the its the FPR, there is a stong smell of gas in the vacuum tube. I thought about cam sensor being a problem. Is it possible to test if the cam sensor is functioning correctly, I really don't have the means to remove the pulley with impact. Also whats a pcu?

Has anybody ever bought a fuel pressure regulator kit. Theres no picture or description of contents. I don't see a reason to buy an entire new unit. Im guessing its like a carb kit, new gaskets springs, strainer, diaphram, etc. I found a kit for $30 w/ shipping, versus $80 for the whole unit. Let me know
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Old 02-03-2011, 08:17 PM   #34
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If a cam sensor goes it it really causes few problems. I believe Bill said 1 in 6 starts may cause a problem.

Personally I have not played with the rebuild kit, sorry I can't help you there. I may have a few FPRs sitting on the shelf. I could ship you one for $30
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Old 02-04-2011, 05:13 PM   #35
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thanks danthurs. the saga continues...... I ended up stopping by the dealer and putting one in. The new fpr didn't totally fix the problem. I did notice a difference in the idle, seems to be a smoother, but the engine still stumbles from time to time.
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Old 02-04-2011, 05:38 PM   #36
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np Eric. Its not hard yet its not easy, i guess its more like time consuming to get to the Cam sensor. PCU i totally messed up on it, i was meant to say CPU, thats what u get when u dont sleep alot lately. as far as the kit, glad u got whole thing instead, i wouldnt mess w/that, i didnt evne know u can rebuild those or should i say if it was worsth doing so. Cause those regulators usually just a small EGR like but w/fuel passage device which controlled usually by vacuum how much gas is needed or should go back in tank (if not mistaken). also, about the checking the Cam, honestly not sure but dealer or good shop might, not sure how again but maybe by some devise that feels magnetic pulses and can tell if its not of.
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