Engine revving on its own? - 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 05-12-2010, 11:36 AM   #11
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Thanks!! Seeing as how the most I've done is change a fuel pump, my under engine skills and logic are a little less stellar than most.

Talked to my friend who used to own this car; he said he had an engine light about a month before he sold it to me, came up as crank sensor, it went away. He said that shouldn't be what causes those rpms surging, but what do you guys think?

Excited to get the code today.
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Old 05-12-2010, 07:19 PM   #12
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Doubt its the crank sensor, but who knows. The code will give you a more definitive answer.
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Old 05-12-2010, 07:23 PM   #13
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Quote:
Originally Posted by ChibiBlackSheep View Post
Remove oil cap, pull upwards.
You also have to take the oil filler neck off. That just twists off as well.
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Old 05-13-2010, 03:30 AM   #14
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The same thing happens with my 97 SE.I'm going to replace the IAC today and check my fuel pressure due to the fact that I've been getting P0171 codes and I'm suspecting a weak fuel pump.I'll let you know if the IAC fixes the revving.
I changed my IAC.It still surges upon startup sometimes but I beleive that is related to my P0171 code.I still have to check the rest of my vacuum lines for a leak.Are you sure your check engine light is working?
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Old 05-15-2010, 05:48 PM   #15
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Code is 102, the MAF code. Going to clean it today and hope that fixes it. RPMs surging upon start up now happens everytime.
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Old 05-16-2010, 06:00 PM   #16
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Cleand MAF sensor and put it back in; no rpm surging and no engine light.
Hopefully it stays this way. Thanks guys!
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Old 05-16-2010, 06:59 PM   #17
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Could have been the problem. Bad signals to the PCM can cause that.
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Old 05-22-2010, 02:57 AM   #18
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Okay, I never reset it(stupid me), so this MAY be the issue.
But..

Light came back today, rpm surging came back today, and frequent stalling came back today.

This was right after I took the MAF sensor out and cleaned it again, it started stalling while in drive for about 10 miles, it died about 4 times.

Another 30 miles no events.

Ideas? I did notice a small crack in a what I suppose is vacuum line connection. I'll take pictures tomorrow.

Should I clean the IAC?
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Old 05-22-2010, 07:59 AM   #19
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Unplug the MAF and drive with it unplugged. If it runs better, the MAF is bad.
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Old 05-23-2010, 02:04 AM   #20
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Drove with MAF unplugged; car still surged rpms on startup and had an awful rough idle at startup, but actual driving had no stall outs.

However I only had stall outs last night, after a week or two of this rpm surging.

So does this mean MAF is bad(with it unplugged would RPMS still surge?)?
Or IAC valve?
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