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Go Back   3800Pro.com Forum > Engine > DTC's, Problems & Troubleshooting

DTC's, Problems & Troubleshooting Getting an engine related DTC? Check here for assistance.

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Old 05-02-2010, 11:31 PM
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Random high Idle on Series I

Hello all and thanks for taking the time to look over this. My 88 has a weird idle problem that I can't figure out. I don't get an engine light but I'm getting VERY high idle intermittently. I have recently replaced the TPS, ignition module, cam and crank sensors and spark plugs. The wires tested fine. my live data shows the TPS voltage increases as well as the throttle position %. I wrote down almost everything on the live data readout of my Actron CP9145:

2nd GEAR SW: OFF
3RD GEAR SW: OFF
4TH GEAR SW: OFF
AC CLUTCH: OFF
AC HEAD PRES: NORM
AC REQUEST: OFF
BATTERY (V): 13.3
LTFT: 122
LTFT TRCL: 0
BOOST (%): 0
EVAP DUTY (%): 20
EVAP SOLENOID: ON
MIL: OFF ( I did get a code 0123 but I erased it and ignored it)
COOLANT TEMP: 211 (is this normal for these engines?)
EGR REQ (%): 0
EGR VLVPOS (v): 0.7 (this was the same with the engine running and not running. I'm confused as to whether or not it's working properly)
EGR VLVPOS (%): 0
KS COUNTER: 4
EXH 02: I'm going to say Stoich because it was going back and forth between lean and rich very fast like an A/F ratio gauge would do.
FUEL CUTOFF: NO
IAC POSITION: 44
IDLE REQ RPM: 750
INJ PW (MS): 3.3
STFT: 135 (I have no idea what my fuel trim is supposed to be at)
KNOCK RET: 0
LOOP STATUS: CLSD
MAF (GR/S): 4
IAT: 136
02S (MV): 60-800 (constantly bouncing)
02S CROSSCNTS 0-3
PNP SW: P/N
PROM ID: 4774
RUN TIME: 15:58
SPARK ADV: 18 deg
THROTTLE (%) 0 (sometimes the idle will go up and this number while physically at 0% will go up to about 7%)
TPS (V): 0.37 (when the above happens, this voltage will also go up to somewhere near .7)
TRANS TEMP: 199
VSS: 0 MPH

Maybe one of you pros can look at my STFT and LTFT and some of the voltages and tell me if things look ok to you. This was written down at idle and everything up to temp.
Thanks, TJ
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Old 05-03-2010, 06:45 PM
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Smile

Update: Well, I bought some CRC MAF cleaner and went to town on it. It seems to have a bit more power and a smoother idle. No high idle issues yet but...we'll see I guess.
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Old 05-09-2010, 10:40 AM
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Did you replace the IAC valve?

Your idle air control valve could be on the fritz, just gummed up and not closing. Try changing it.

I had this problem with my 94 Regal and it was throwing a 122 code (TPS voltage low) and replacing the TPS fixed it, I see you've tried that though.
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Old 05-11-2010, 11:51 PM
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I have not replaced or even looked at the IAC. I haven't seen the high idle since I cleaned the MAF sensor. The IAC will be my next victim if the high idle problem shows its ugly face again though. Thanks for the response.
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