Rough idle around 1000 - Update 1/16/08, Wasn't PCM. - 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 01-07-2008, 10:49 PM   #31
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Quote:
Originally Posted by Skippy1827
where is the ECT?
Right under the thermostat housing, right side of the lower intake manifold. There'* a little 3 pin connector and cable going to it.
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Old 01-08-2008, 06:10 PM   #32
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Ok, stalled again today. Let'* sum this up and see if it looks like a bad PCM.

1. Hard starts in the morning
2. Stalled when letting off at WOT 2 times.
3. Frequent CEL when accelerating up a hill, claims a bad BCS
4. Stinky exhaust after WOT, and bad MPGs in general. (Cat was replaced with a high-flow a while back)
5. Rough idle/idles no less than 975-1000
6. Ruled out coolant temp sensor for PCM, as I am getting a accurate reading on the scantool.
7. Was told by previous owner that it DID idle properly, but noticed it idled differently shortly after getting a jumpstart.

I am determined that it is a bad PCM, since I am having all these symptoms. I had previously checked the fuel pressure, and it is in spec. FPR is good, no smell of fuel in the vacuum line.
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Old 01-08-2008, 09:30 PM   #33
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When the CEL light comes on....what does the code read? If you can check that - it would help to narrow it down. A rough idle and hard start/stalling could be caused by a number of things. Remember the basics of engine operation...spark, fuel, and compression. Could be as simple as a bad wire or an O2 sensor....but check the code.
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Old 01-08-2008, 09:35 PM   #34
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Whoops, forgot to say the number. Code 57 - Boost Control Problem.
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Old 01-09-2008, 01:29 PM   #35
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#&*[email protected]$^&(#[email protected]%(&* Stalled AGAIN today.Checked my codes, still have the 57- Boost Control Problem and a new one, 34 - Mass Air Flow Sensor Circuit. Exhaust was SUPER stinky when I started back up, go figure.

Why me? Especially when it stalled on a 55mph country road with ditches on both sides, I had to coast to the nearest road.
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Old 01-10-2008, 03:30 PM   #36
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Well..... I am officially calling it a bad PCM. Why you may ask? Got TONS of new codes today, stalled 2 times, almost a 3rd but it sputtered back to life.

History codes - 26, 34, 57, 43

Current (Today'* codes) - 26, 34, 36, 57, 43

I feel like I am reading lottery numbers.

26 - Quad-Driver " A " Fault
34 - Mass Air Flow Sensor Circuit
36 - Transaxle Shift Control Problem
57 - Boost Control Problem
43 - Electronic Spark Control Circuit

Forgot to mention what the tranny was doing. I stopped when it stalled, started it, put it in drive, pushed the gas, BARELY moved. I think the TCC was locked up, because when I tried to accelerate, it felt like I was driving against a brick wall.
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Old 01-10-2008, 03:59 PM   #37
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Before all the craziness with the stalling and PCM weirdness I would have you check your PCV valve and MAP sensor.

Good Luck.
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Old 01-13-2008, 06:13 PM   #38
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Special thanks to Crash93SSEi. he is sending me a spare PCM so I can determine if it'* my problem.

Thanks Ryan!
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Old 01-16-2008, 07:52 AM   #39
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Well, no change with a different PCM. :( Still idles the same, stalls out after letting off after a hard WOT, exhaust smells funky.

Something tells me my PCM codes were my loose battery cable. I found it to be loose.

Next up is checking the fuel pressure and FPR. I do have a vacuum pump, how much should I pump it up on the FPR to check for leakdown?
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Old 01-16-2008, 12:11 PM   #40
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The Code 43 has me intrigued....

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