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Prev Professional Automotive Repair Technical Discussions for January 29, 2008
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Open Help Requests for GM
Help Request Answers
1994 Buick LeSabre Custom 3.8L No Start, Misfire, MIL Lamp on VIN: 1G4HP52LXR
Car came in as intermittent no start with codes PO 101 Mass Air circuit/signal and PO1626 loss of fuel enable signal from Pass-key Module. This vehicle after repairing bad Grounds and power supply fuse connections has now developed to a intermittent Drivabilit... Trouble codes: P00, P00
1997 Cadillac Seville SLS 4.6L squeeky belt after alternator replacement VIN: 1G6KS52Y3V
Hello fellow Cadillac techs. We have a situation in our shop were the serpentine/alternator belts come back squeeking in a couple of days after the alternator has been replaced. The alternators in question are AC/DELCO #'s 334-2411 (first design) & 334-2470 (2...
1989 Chevrolet C1500 Cheyenne 5.7L No Closed Loop VIN: 2GCEC14K0K
Well..., ECM never enters Closed Loop. Data stream showed coolant temperature at 145Deg and steady, so we changed thermostat. Now it shows coolant temperature above 195Deg; MAP voltage about 0.9vdc; O2 voltage normal at idle. At cruise, O2 voltage drops off to...
1997 Chevrolet Cavalier 2.2L wipers VIN: 4J23HJ341H
first thanks to all who read this;this one is beating me up .after what i thought was a simple fix turned to sh.. ,i ordered another dalay module and dubble checked my wiring voltages and resistances all tested ok.i ran a redundant ground just cuz.installed a ...
1998 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 3G1JC5244W
Hello all, I was wodering if any of you could help me to get some info regarding the EGR system on this vehicle. The code re-occurs Immediately. Tested with Vantage on road test, no activity on pintle feedback circuit (pin C ) or EGR control (pin A). On open ... Trouble codes: P0403 (EGR system)
1999 Chevrolet Venture 3.4L Poor Idle Quality, Misfire VIN: 1GNDX03E7X
heres a good one to all the gm techs i've been on this vehicle for days and i can't figure it out. at idle the fuel trims go up to -17% and has a slight miss it clears up at about 1500-2000 rpms, it also keeps setting misfire codes on bank 1. monotoring misfir... Trouble codes: P0300, P0301, P0303, P0305
1999 Chevrolet Silverado 1500 5.3L Engine VIN: 2GCEK19TXX
Cylinder # 4 misfire (P0304) resets consistantly. Unplugging (new) injector & (new) coil on cyclinder 4 makes no difference to idle quality. Spark plug gets dark on the cylinder. Compression seems ok. Vaccuum guage connected to intake while running does not fl...
2005 Chevrolet Express 1500 5.3L Starting VIN: 1GBFG15T85
The complaint is will not crank @ times. It has occured 2 times for the customer. No click or noise when cranking. Lights, all accesories work fine. Starter, battery connections are clean & tight. Customer is leaving Thursday for an out of town trip & does not...
1996 Geo Prizm LSi 1.6L MIL Lamp on VIN: 1Y1SK5266T
This Geo came from another shop with this code set. It will reset after clearing as soon as it is started. If cleared with engine running, it will stay off. Have performed testing as outlined in technical information. One problem is that the wire colors in MOD... Trouble codes: P1300 (icm circuit)
1995 Oldsmobile Aurora 4.0L No Start, Hesitation, Stall VIN: 1G3GR62C6S
this car came to me after the owner tried to fix himself. it exhibits long crank time and he says going down the road it will stumble and not go over 2000 rpms. after he shuts it off for awhile it restarts. i have checked the cat its fine but the fuel pressure...
1990 Pontiac Bonneville LE 3.8L No Start, Misfire VIN: 1G2HX54C8L
When i received this vehicle it acted like the valve timing was off. It pops through the intake hard enough to blow vacuum lines off. Pulled timing cover to discover the chain was dead on with no play when reversing directions. The magnet on the cam gear on th...
1995 Pontiac Grand Am SE 2.3L No Power VIN: 1G2NF55D2S
Car has no power.Idles good will accel.ok out of gear.In gear barely move.No misfire.All scan reading look ok.Exhaust smells rich but no smoke.I think timing chain may have jumped a tooth or two.Only way to check is to remove front cover on this quad 4 engine....
2000 Pontiac Grand Prix GT 3.8L Ignition/Shiftlock VIN: 1G2WP52K9Y
6 months ago this car came to me with the complaint that it wouldnt come out of park once in a blue moon.We could never duplicate the problem but read in archives that a few of you guys had ran into this and solved it with a new shiftlock solenoid.On it went a...
2003 Pontiac Bonneville SE 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out VIN: 1G2HX52K83
help!!! this car will run great and just like you flip a switch it goes lean, fuel trims climb to + 25 o2s drop to 0 runs real rough and you can not barely move, when this is going on the fuel pressure and volume are good, i have ran this car with the maf unpl...
2005 Pontiac G6 GT 3.5L Starter VIN: 1G2ZH54875
Hi and thanks in advanced for your help. The starter won't disengage sometimes for a short period. We called our local dealer and they said they did a computer reflash for a starter update with no help to the problem and wasnt sure what to do. Thanks
2000 Saturn LS2 3.0L No Start, Poor Idle Quality, MIL Lamp on VIN: 1G8JW52RXY
vehicle was brought in for an intermitant no start/ hard start issue. customer states that the vehicle will crank but not start. after several minutes of cranking vehicle will finally start, sometimes will idle very rough until driven, and the mil light will i... Trouble codes: P727, P0335, B (crank sensor-no engine speed detected), P1780 (trans code- unkown- seems to be related to not signal to or from ecm)

Fixes & Summaries for GM
Fix/Summary Answers
2005 Buick LeSabre Custom 3.8L dash lites,gauges VIN: 1G4HP52KX5
Thanks to everyone for several good ideas;I did try another battery but had the same problem;rechecked and located more grounds. Dennis was good enough to tell me that a new instrument cluster cured his customers Buick with the same symptoms and I recommended ...
1991 Cadillac Fleetwood 4.9L Misfire VIN: 1GEDZ90B1M
Many thanks to all who responded to my plea. After 30 plus years I missed the simplest item (maybe I'm getting to old). I pulled the valve cover as suggested and measured rocker lift and compared to other cylinders. I feel embarrased that I had to ask for h...
1995 Cadillac DeVille 4.9L Suspension VIN: 1G6KD52B9S
the xar had the up graded relay for the struts in it aready but i guess blown the relay put a new in it it been ok thanks for all the help josh [...]
2000 Cadillac hearse 4.6L No Start, no crank VIN: 1GEEH90Y5Y
Hi Everyone, Thanks for the replies,I kinda got lost and went away from he basics with this one. Checked for replays this morning and 2 guys said check the Grounds. Went through the fixes, several people mentioned the ground under the alternator. They did not ... Trouble codes: U1000, U1096, U1301.
1995 Chevrolet C1500 Suburban 5.7L Excessive Emissions
This vehicle has been fixed. I removed the EGR valve to check that all passages were clear, no excessive carbon was present, cleaned the valve and reinstalled it, no improvement. Remember the scanner read either 0 or 100%, this fit nicely with information t... Trouble codes: 44 (Lean condition).
1996 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 1GCEK19R1T
Well, where to start? To get the vehicle running we replaced the crank sensor and retimed distributor, apparently someone else worked on the vehicle before we got it. Also had to replace the fuel spider and regulator due to fire damaged. would have been n...
2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13592
The member from Tenn.I think his name was John was right on the money!!! The batt connection had just enough green corrosion on it that there was not a real good mechanical or electrical connection. His post said to check the battery. He had this happen too hi... Trouble codes: P0601, P0604, P0606, P0607.
2004 Chevrolet Colorado Z71 3.5L Poor Idle Quality VIN: 1GCDS14694
Cleaned throttle body as some suggested and condition improved. Although I still suspect a possible valve issue the customer elected to take vehicle and give it a few days, heard from him today and said all is good. Thanks for all the replies. Trouble codes: P0506 (Idle control system RPM too low), P0106 (MAP or BARO ckt. out of range).
2004 Pontiac Montana 3.4L Heater VIN: 1GMDX13E74
First I want to thank everyone for their replies. The Montana has been gone for a week now, temperatures around these parts have been reaching -35 celcius, and I have heard from the customer that all is great. I first checked the operation of all external link...
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