Still fighting idle problems. - 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 02-06-2006, 12:08 PM   #1
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Default Still fighting idle problems.

I went to start my car today and it would not idle. I would start it, it would run for about a half of second and then die. I had to hold the gas down just to get it to idle. After that, the car would finally idle, but it would surge between 800-1200 rpms. It then finally cleared out back to normal. It threw a code for a couple seconds and it came up with TPS 21 code. I already replaced the TPS sensor. I'v been having a feeling my IAC valve is crapping out. I cleaned it and it didnt help. Would a bad IAC throw a TPS code? Help, Im sick of trying to figure this out.
The car still idles at 1300-1400 RPMS when it is warmed up.

Rob
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Old 02-06-2006, 02:40 PM   #2
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First idea is you may not have disconnected the battery for 30 mins after changing the sensor. That'* the first thing I'd try.
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Old 02-06-2006, 03:16 PM   #3
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Default Re: Still fighting idle problems.

When you replaced the TPS, did you calibrate it? If the TPS voltage is too low or too high, it'll set a code, and that happened to me before I knew that the TPS was adjustable, but I never noticed any symptoms other than an SES light.

Was the TPS code the only code present? Check the electrical connector for the TPS, and if you have access to a scan tool, a scan would probably be helpful.
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Old 02-06-2006, 08:37 PM   #4
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I did reset the battery multiple times. I did calibrate the TPS also. I get all the correct voltages. I still think its my IAC valve making things screwy. The car started great after work today, and no SES lights.

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Old 02-06-2006, 08:53 PM   #5
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At this point, you may want to look for vacuum leaks, clean your maf and IAC to ensure the passages are clean.
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Old 02-07-2006, 07:26 AM   #6
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Me and my dad checked for vaccuum leaks, I cleaned my IAC and the car has a new MAF.
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Old 02-07-2006, 09:13 AM   #7
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We have seen a few sensors come out of the box bad. If you are still getting the code for TPS, have checked voltage and tried adjusting/unplugging. Seems that something is amiiss there.

Double check the wiring for bare or rubbed spots going to the TPS/Throttle Body area..besides that..I think it may be a bad sensor.
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Old 02-07-2006, 09:20 AM   #8
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I'd be curious to see you check the wiring between the TPS and the PCM.
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Old 02-07-2006, 11:54 AM   #9
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It has only thrown the TPS code once since I put the new one on. I honestly think it threw the TPS code because I was fighting with the car, trying to make it idle. I was pushing the gas pedal down while the idle surged back and forth. It then cleared out. Before I replaced my TPS, my old one was throwing the code constantly. The car did idle normal before I took the thottle body off, cleaned it and the IAC, and put on the new TPS sensor. I even took the throttle body off a second time and replaced the gasket. Still problems. Would the computer throw a code for the IAC if it was bad/malfunctioning?


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Old 02-08-2006, 11:52 AM   #10
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I just realized when I start my car from a cold start, it idles only at 900-1000rpms. When my car warms up, thats when my idle gets to 1400 RPMS. It seems like its doing the opposite of what its suppose too.

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Rob
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