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Prev Professional Automotive Repair Technical Discussions for October 12, 2010
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Open Help Requests for GM
Help Request Answers
1991 Buick LeSabre Limited 3.8L Excessive Emissions VIN: 1G4HR54C4M
mass air reads aprox 20gps at idle runs rich inj pw 14ms wire good from mas sensor to ecm changed prom ecm & mafs reads air flow when sensor un pluged when motor stopes air flow 0gps
1999 Buick LeSabre Custom 3.8L Pcm VIN: 1G4HP52K0X
Hi guys. Got probably a simple fix here. Have no communication with my pcm thru my tech ii and i checked my wires and found that i either have a problem with my wiring harness or a problem with the pcm. So cut the purple wire at the dlc and the pcm (pin # 59 p...
2005 Cadillac CTS 3.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G60P567X5
Thanks in advance for all your help. car came in yester day running rough, scanned and found codes P0206,P0306, P0523, PO521, AND PO443, So we put in new a/c delco plugs and other shop put in autolite plugs. after replacing the plugh all of the codes went away... Trouble codes: P0206 (Injector circuit problem), P0306 (Misfire 6), P0443, P0521 (Engin oil press sensor performance), P0523 (Engin oil pressuer sensor circuit signal low)
1979 Chevrolet El Camino 5.7L speedo bullet
have this 1979 el comino thats like brand new. everything is new. customer wants nothing to leak. got everything to stop leaking but transmission speedo bullet. put new cable, new bullet it stops leaking for about a month, then it leaks again out of the cable ...
1986 Chevrolet Corvette 5.7L No Start, No injector pulse VIN: 1G1YY0783G
Hello i am having a great deal of trouble with this car. This is a car that sits in a guys collection they get it out every so often in the summer and drive it. Well sometimes it wont start they have been having this trouble for a few years It intermittently n...
1994 Chevrolet G20 Chevy Van 5.7L Hesitation, Cuts out VIN: 1GBEG25K7R
Hey guys, vehicle was dropped off. customer ststed it would die outten minutes after he started it. would take about five min. to restart. first thing i noticed, the injectors would pulsate after key was turned off, filling the bowl up with gas. both inj. are ...
1999 Chevrolet Blazer 4.3L transmission VIN: 1GNCT18WOX
I am working on a Blazer with multiple failures that I believe are related. The truck has had an engine replaced some time ago. Symptoms include: no shift, trans has power on connector pin E, but stays in 3rd only. The odometer and shift indicator display only...
2001 Chevrolet Silverado 1500 4.8L Misfire, MIL Lamp on VIN: 1GCEK14V0I
Vehicle was driven into shop. Customer states CEL comes on for short periods intermittently. Used SOLUS-PRO Scanner to retrieve codes. I believe Mis-Fire & EGR Codes are a separate issue. Could a faulty EGR be the cause of an engine Mis-fire? The Scan tool ind... Trouble codes: P0300 (Random Multiple Mis-Fire Detected), P0404 (Egr A Control Circuit Range/Performance), P0405 (Egr Sensor A Circuit Low)
2001 Chevrolet Impala 3.4L abs VIN: 2G1WF52EX1
hope someone has an answer,i have replaced the abs module and pump assm twice in the last year.code c1218 comes and goes with no pattern.i have checked connectors and have run out vof options. please help
2003 Chevrolet Silverado 1500 4.3L No Start VIN: 1GCEC14X13
Ok guys my boss is killing his self on this one Truck came in customer stated that he went out tried to start truck crank no start.Found u1000 & u1041 No Power to the ICM no fuel p. customer states never had this problem before. Done hours for research try a w... Trouble codes: U1000 (u1041-), U1041
2005 Chevrolet Cobalt 2.2L Hesitation VIN: 3G4R5T6TG5
this colbalt came in with no throttle response car runs good. but no throttle at all. the only code i could get is driver 5. makes no sense to me any help would be great.
2008 Chevrolet Avalanche LT 5.3L ABS light on VIN: 3GNEC1208G
Sets code CO161 Symptom 00 (intermit)and turns on ABS lamp. Could not duplicate fault in shop. Replaced the B/P sensor @ customers request. Did not solve problem. Scan data showed 7 occurances and 3 passes in freeze frame. Also had history codes B1011 Symptom ...
2008 Chevrolet Uplander 3.9L radio- window VIN: 1GNDV33W38
Hello Techs,this van got a boost from somebody and he crossed the cables!we lost power to radio and the rear vent window switch,checked all wiring and fuses but no luck,is this going thru the BCM? any help ? thanks Ralph
1999 GMC K2500 Suburban 5.7L Passlock VIN: R8XG546063
Thank you for readind,vehicle came in intermittent none start,security light on,dtc p1626 and u1192,check ground and volt to vtd [passlock]control module ok,tech 2 can communicate with vtd {passlock]control module,also with pcm,check resistance in ppl wire bet...
2001 GMC Savana 1500 5.7L Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GTFG15R9Y
Engine missing at Idle. cylinders 7 and 3. Not loaded and high RMP's engine runs fine. On Hwy under load occasonal loss of power seems to run better with heater on high. Fuel ECO Sucks Codes were: Bank 2 Lean Cylinders 7 and 3 misfire No Intake leakes teste... Trouble codes: P0300 (Acutaully cylinders 7a nd 3 are missing)

Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick Skylark Custom 2.3L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1G4NJ14D2L
Well this little Buick still isn't fixed. I have traced all the wiring back to the ecm, replaced the ecm, icm, coolant sensor and pigtail. I can clear codes and check the data and the coolant sensor reads correct and low speed radiator fan is off. But 1-2 seco... Trouble codes: 41 (Mem-Cal-- loose defective or incorrect.).
1992 Chevrolet S10 Blazer 4.3L No Start VIN: 1GNDT13W9N
Thanks you all for the info. The issue was fuel pressure. I am an Automotive instructor and the students originally looked up the specs for a 3.8l not a 4.3l. The pressure for this engine is 42-46 psi. They passed the test and moved on. After reading the infor...
1995 Chevrolet G30 Chevy Van 7.4L Hesitation, Stall, MIL Lamp on VIN: 1GDHG39N1S
Thanks for all the great replies. Customer found a used pressure reg. assembly. This brought the pressure back up 35 psi. Vehicle runs fine again. Thanks again. Trouble codes: 33 (map sensor).
2000 Chevrolet Astro 4.3L No Start, Misfire, MIL Lamp on VIN: 1GCDL19W2Y
This was opened by a coworker of mine sorry about the delay of not closing it, I spoke with him and he had changed out the ignition control module and the ECM to remedy the problem. The Battery had leaked onto the wiring harness that runs behind it and ran do... Trouble codes: P0339.
2002 Chevrolet Trailblazer LS 4.2L shift points VIN: 1GNDT13S82
Sorry it took so long to close this I have been trying to get the vehicle back in but could not get ahold of the owner. I have just found out that they traded the Trailblazer and do not have it any longer. If I hear anything on it I will post the result
2003 Chevrolet Monte Carlo SS 3.8L MIL Lamp on VIN: 2G1WX12K73
Thanx to all responders..many great suggestions. Vehicle was driven by mom and daughter, and the code only came back after fuel up by teenage daughter, at a diff station(cheaper).Finally after catching the detonation in flight. The responder who said engine no... Trouble codes: P0327.
2007 Chevrolet Malibu LT 3.5L cam advance system VIN: 1G1ZT52N47
1998 GMC Jimmy Envoy 4.3L Poor Idle Quality, Cuts out, Stall, Misfire VIN: 1GKDT13W4W
ok i know whats going on. there was some usefull information here. i verified the ignition timing and then i did an injector balance test and found the ignition and fuel injection systems working. it was just misfiring really bad on 4 and 6. a compression test...
2005 GMC Sierra 2500 HD 6.0L air bag system VIN: 1GTHK24U95
this vehicle is fixed.the yellow wire from the impact sensor had corroded where it runs along the drivers rocker panel interior trim.this was due to the trim piece rubbing through the wire and then being subject moisture.kenneth mentioned this was where the wi...
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