high idle - update - 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 12-21-2007, 12:22 AM   #1
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Default high idle - update

Several things going on here - here'* the proscan report:

Requesting MIL Status & DTC Count
TX: 0101
RX: 41018307E500
MIL: On
Stored DTCs: 3
Requesting List of Stored DTCs
TX: 03
RX: 43010701220507
Stored DTC: P0107
Stored DTC: P0122
Stored DTC: P0507
Requesting List of Pending DTCs
TX: 07
RX: 47010700000000
Pending DTC: P0107
Checking for Freeze Frame Data
TX: 020200
RX: 4202000507
Freeze freeze data found for P0507
Freeze Frame: Reading Fuel System Status
TX: 020300
RX: 4203000200
Fuel System 1: CL
Fuel System 2:
Freeze Frame: Reading Calculated Load
TX: 020400
RX: 4204000E
Calculated Load: 5.49
Freeze Frame: Reading Engine Coolant Temp
TX: 020500
RX: 42050082
Engine Coolant Temp (F): 194
Freeze Frame: Short Term Fuel Trim (Banks 1,3)
TX: 020600
RX: 4206007F
STFT Bank 1 (%): -0.78125
STFT Bank 3 (%): -100.78125
Freeze Frame: Long Term Fuel Trim (Banks 1,3)
TX: 020700
RX: 4207008B
LTFT Bank 1 (%): 8.59375
LTFT Bank 3 (%): -100.78125
Freeze Frame: Short Term Fuel Trim (Banks 2,4)
TX: 020800
RX: NODATA
Freeze Frame: Long Term Fuel Trim (Banks 2,4)
TX: 020900
RX: NODATA
Freeze Frame: Intake Manifold Pressure
TX: 020B00
RX: 420B0039
Intake Manifold Pressure (inHg): 8.26086956521739
Freeze Frame: Engine RPM
TX: 020C00
RX: 420C001B86
Engine RPM (rev/min): 1761.5
Freeze Frame: Vehicle Speed
TX: 020D00
RX: 420D0000
Vehicle Speed (mph): 0
Freeze Frame: Ignition Timing Advance
TX: 020E00
RX: NODATA
Freeze Frame: Reading Monitor Test Results
TX: 0101
RX: 41018307E500
Misfire Monitoring Supported?: Yes
Misfire Monitoring Completed?: Yes
Fuel System Monitoring Supported?: Yes
Fuel System Monitoring Completed?: Yes
Comprehensive Component Monitoring Supported?: Yes
Comprehensive Component Monitoring Completed?: Yes
Catalyst Monitoring Supported?: Yes
Catalyst Monitoring Completed?: Yes
Heated Catalyst Monitoring Supported?: No
Heated Catalyst Monitoring Completed?: Yes
Evaporative System Monitoring Supported?: Yes
Evaporative System Monitoring Completed?: Yes
Secondary Air System Monitoring Supported?: No
Secondary Air System Monitoring Completed?: Yes
A/C System Refrigerant Monitoring Supported?: No
A/C System Refrigerant Monitoring Completed?: Yes
Oxygen Sensor Monitoring Supported?: Yes
Oxygen Sensor Monitoring Completed?: Yes
Oxygen Sensor Heater Monitoring Supported?: Yes
Oxygen Sensor Heater Monitoring Completed?: Yes
EGR System Monitoring Supported?: Yes
EGR System Monitoring Completed?: Yes

If you guys remember correctly when we got it running after the UIM/LIM failure the idle was way high. I installed a new TPS, no changed. I adjusted the butterfly back because my son accidently tightened the retaining nut on the end of the shaft of the butterfly. At this point I wonder if the high idle really ever got fixed. I did remove the MAF and looked at it. I know I didn't clean it when I cleaned the TB. I went to do that tonight and we don't have a #[email protected]&*% Q-Tip. One other piece of info... 2 days ago it started doing this thing were it wont start when it cold unless you step on the gas and pump it a little bit. When you let off of of the gas to let it idle it wants to die and then it catches itself and starts to idle around 1100 rpm How do I need to proceed. As always...TIA. Sorry about the long post.
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Old 12-22-2007, 07:09 PM   #2
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High Idle? Have you tried changing out the IAT sensor, or testing it? That could be it...

http://www.bonnevilleclub.com/forum/...e=article&k=24

In fact, that'* the only thing I can think of...
The P0107 DTC is a MAP (MAF) code, as I think you know... Cleaning it SHOULD fix it, if it doesn't, try getting one at a pick n pull.
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Old 12-24-2007, 11:01 AM   #3
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Thanks Petra. I have cotton swabs now So I'll clean the MAF and do the resisitance check on the IAT sensor. Thats the sensor located in the air intake bellows right?

I'll get back to ya.
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Old 12-26-2007, 10:48 PM   #4
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Update -

I've checked all of the vacuum lines, cleaned the MAF, and verified that the IAC is moving. I've also replaced the TPS (when the UIM/LIM procedure was replaced last month. I ohmed out the IAT. It read 5.56K @ 50 degree air temp. I'm starting to believe this is more of a mechanical issue with the butteryfly being stuck open enough to be letting to much air past it and causing the high idle. What else can I do to check this out further? Can anyone else think of anything else to try before I take the TB back off and inspect?

BTW, the ses light went out, but that probably was cleared because we've had the battery cable off today putting in the amp and sub for my son.

Thanks...
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Old 12-27-2007, 03:38 PM   #5
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I REALLY need help here guys. I'm totally out of ideas, I've tried everything I can think of and I can't find the problem :( Can someone please help. thank you.
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Old 12-27-2007, 06:57 PM   #6
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Quote:
Originally Posted by BMWhound
I REALLY need help here guys. I'm totally out of ideas, I've tried everything I can think of and I can't find the problem :( Can someone please help. thank you.
Based on the information available, we can only speculate without knowing the history of what your repairs have been, or without knowing if your car was in gear, or neutral when the freeze frame data was recorded. If the engine was loaded, or unloaded would make a difference in vacuum readings. You should take a close look at the manifold vacuum data (8.26 inHg) as a possible source of your high idle problem. This is an extremely low vacuum on an unloaded engine! In addition, check the TPS reading on the scanner at idle, and post your findings.
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Old 12-27-2007, 07:53 PM   #7
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Z,

Thanks for the reply. As far as the repairs that I have done, I have replaced th UIM and LIM gaskets as previously stated in my earlier post. This included cleaning the TB, and replacing the TPS sensor. Check this link out http://www.bonnevilleclub.com/forum/...ic.php?t=89507
After these repairs, the car was ok except for the high idle @ 1000 rpm. The car ran fine till a week ago when It wouldn't start with out putting your foot on the gas pedal and opening the TB plate a little. We also have a ses light now as well. With codes

P0107
P0122
P0507

I just got the proscan software a few weeks ago, so I'm still trying to figure it out. I can navigate the software ok, but the values I see don't mean anything to me because I don't understand if they are good or bad......know what I mean I need help diseminating all the data. For instance "Intake Manifold Pressure (inHg): 8.26086956521739 " What should it be? and why is it that low? BTW, the car was in park when the FF was taken. Can you explain this further:
Quote:
In addition, check the TPS reading on the scanner at idle
I'm not sure I can look at that with the version of the prodata software that I have. Thanks in advance for your help.
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Old 12-27-2007, 09:58 PM   #8
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I had a fast idle when I forgot to put the PCV back in. It is important that it has a good seal (ie: o-ring).
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Old 12-27-2007, 10:08 PM   #9
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Quote:
Originally Posted by Bigfoot
I had a fast idle when I forgot to put the PCV back in. It is important that it has a good seal (ie: o-ring).
Been there done that. I actually checked that again today. I'm 100% sure thats not the problem. thanks anyway
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Old 12-27-2007, 10:18 PM   #10
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Your DTC’* interputed:
P0107 MAP sensor detects manifold pressure/vacuum out of range
P0122 TPS out of range-- low circuit voltage
P0507 Idle out or range (Obviously high)

Wow, you have really been through the ringer with this one. First, one of your DTC’* are consistent with low manifold pressure/vacuum, or a bad MAP sensor. Vacuum @ idle should be in the range of 16-18 in hg. You should use a vacuum gage on one of the manifold vacuum ports to confirm the scan readings. Are you sure that the MAP sensor was not damaged during all of this work and has a good vacuum source? (Good seal or vacuum hose)

The reason I ask you to check the TPS reading with a scanner is; you need to see what the PCM is using for the TPS voltage. You can check the voltage @ the TPS with a DMM and it may check within range (.5v – 4.0v @ WOT), however that does not mean that the PCM is using that same information to work with. You can have the TPS reading (voltage) scanned at one of the major part suppliers. This “scanned” reading is very important! More than likely, the idle air control IAC is not your problem.

Things to check:
1) Engine vacuum @ idle (using manual vacuum gage)
2) MAP sensor readings (using scanner)
3) TPS readings (using both DMM @ the TPS & then with scanner)
4) IAC counts (using a scanner)

Also, FYI here is a good link on the TPS DTC (P0122)
http://www.gearchatter.com/viewtopic...ighlight=p0122
Note: This is not vehicle specific TPS information, but can be used as a guide
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