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Prev Professional Automotive Repair Technical Discussions for September 29, 2008
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Open Help Requests for GM
Help Request Answers
1998 Buick Regal LS 3.8L lifter VIN: 2G4WB52K4W
originally car came in w/ blown head gasket. removed cylinder heads sent to machine shop. the machine shop resurfaced heads crack tested and reseated valves. since installation. one of the lifters on back head doesn't want to pump up and is tapping. checked oi...
2001 Buick Century Custom 3.1L headlamps VIN: 2G4WS52J81
this car was brought in with customer concern of headlamps seem to be dimmer than they use to. did visual inspection of capsules, found some fogging but not much. turned on headlamps and tested alternator output and watched headlamp brightness against wall of ...
1997 Cadillac Catera 3.0L Cooling System VIN: W06VR52R2V
Coolant system holds pressure staticly. Run engine and leaks at Right rear above bellhousing somewhere. Leaks clear/grey in color. Grey crusty residue where coolant leak tracks are. Any common weak areas for this condition on the 3 liter V6. Thanks for your he...
1977 Chevrolet Corvette 5.7L hazard, flasher VIN: 1Z37L7S445
ok vette guys, i have a problem i need some help on. vehicle came into our shop with multiple problems. i'm down to this last issue and have hit a wall. the problem i am having is that when the brake pedal is depressed, the hazard indicators on the dash and th...
1990 Chevrolet Corsica LT 3.1L No Start, Cuts out VIN: 1G1LT61TXL
car towed in no start after fill up, starts and dies, checked codes none, fuel pressure good, checked ignition switch power at koeo - ok, checked fuel filter -plugged replaced -same, only checked resistance on #1 and #6 injectors - 12ohms as need to take plenu...
1995 Chevrolet K1500 Cheyenne 4.3L Poor Idle Quality, Hesitation, Surge, Misfire VIN: 1GCEK14Z3S
Greetings Techs, Have an intermittent brain burner here.This 4.3L TBI, HEI system truck will on occasion hunt idle and misfire at or around 2000 rpm. Does not matter if hot or cold. She will then idle and drive like new. I drove the vehicle for 45 minutes at o...
1996 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52MXT
car came in with p1106 code. vacc 19in idle. cked map showed .20 volts all the time, so i tried new map and on test drive would only go to 2 volts on hard accel. normal idle was.7 to .8 volts. so i start alldata tree. koeo unplugged map shows .o2 volts. next c... Trouble codes: P1106 (map intermittent high voltage)
1998 Chevrolet P SERIES 7.4L No Start, Stall VIN: 1GBKP37JIW
thanks for the help in advance tough intermitten problem this is a motor home that stalls out when driving on highway customer states after quits running they coast down the road and it will restart after about 5 minutes the codes p340 and p1351 will be stored... Trouble codes: P0340, P1351
2000 Chevrolet Corvette 5.7L gauges, windows VIN: 1G1YY12G0Y
This post is based solely on what the cust. has told me as the car has never acted up in my possesion. It occurs randomly and all symptoms happen at the same time. When glitch occurs both windows fail to work from the drivers side sw, fuel ga goes to empty, oi...
2002 Chevrolet Venture LS 3.4L Warning Light VIN: 1GNDV03E72
Greetings fellow techs, Got this 2002 Chevrolet Venture Van in this morning with the complaint of the All Wheel Drive light disable on in the dash. Scanned the van for codes and found the following history codes-U1016-Lost communication with IPC, U1016-Lost Co...
2002 Chevrolet Tahoe LS 5.3L Right turn signal VIN: 1GNEK13Z32
Vehicle brought in right rear trailer turn signal inoperative. found fuse for right rear trailer ckt in underhood box blown. replaced fuse, when right t/s applied feeds back through all brake lights and all brake lights flash. remove fuse, all turn signals fun...
2004 Chevrolet Trailblazer LS 4.2L Hesitation, MIL Lamp on VIN: 1GNDT13SX4
Hello Group, i got the 2004 Trail Blazer 4.2L keep Returning Service Code At First P0133 And P0410 iHave Check out the Secondary Air Pump Solenoid The Resistance Was Off So I Replace Solenoid with the valve, i have monitor the o2 voltage at idle and energise t... Trouble codes: P0410
1997 GMC C1500 Sierra SLE 5.7L No Start VIN: 1GDEC19R6V
customer brings in this gmc truck.she thinks it has a fuel pump issue.we checked and found low pressure and no regulator problems so we go to replace pump.i suggest to her we should use a factory unit in it.she says she can get this one replaced from where she...
2002 GMC Envoy SLE 4.2L guages inop VIN: 1GKDT13S22
Here's a good one for you GM techs . on every module I can get loss of communication codes. Basically it has to sit over night first thing in the morning at about 50 degrees the IPC will only have a speedo and a tach the other guages are inop and idiot lights ... Trouble codes: U1041, U1026, U1041, U1152, U1162
2003 GMC Sierra 2500 HD 6.6L transmission
Vehicle shifted and operated without fault until a 3 week rest as customer vacationed. Upon return engine started and immediate SES light. Pulled lever into reverse, got flashing 'R' displayed in the PRNDL, non-responsive in Reverse, pulled into drive, slipped...
1997 Oldsmobile Bravada 4.3L No Start VIN: 1GHDT13W3V
the vehicle will crank with no dash lights or tach signal present. then all of a sudden the dash lights and self test bulbs will illuminate and the truck will start up. some times the self test lights will light up with the key in the crank position, except fo...
2003 Oldsmobile Alero GL 2.2L Windows VIN: 1G3NL12F33
Hey Guys & Gals,I Have An Olds Alero With Power Windows That Don't Go Down. I Pulled Door Panels Off And Found A Broken Plastic Piece That Attaches The Regulator To Glass. I Have New Plastic Pieces Coming From Dealer.My Question Is There Appears To Some Type O...
1999 Pontiac Sunfire SE 2.2L Misfire, MIL Lamp on VIN: 1G2JB1249X
Hi, this is my first post.i was wondering if anyone has seen high resistance in injectors cause coil pack failures. my daughters sunfire has gone through 2 in about 5 months.it will set a random missfire code and run on 2 cylinders,replace coil pack and all is...
2002 Pontiac Firebird 3.8L Oil Pan VIN: 2G2FS22K82
What is the best way to remove this pan? The book says to jack up the engine but it looks like the trany won't let it go up very far at all. Also are there any things I should look out for so I don't have to do this a second time? The book only give 3.3 hr's b...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L No Start, Cuts out, Stall VIN: 1G4HP52LXR
As most of you suspected, it was a bad ECU. I did do a check of both cam and crank sensors and the wiring. I even tried a second ICM. What I did see, thanks to some sugestions, was incorrect scan data. I would get a readings on ceertain PID's, even when th...
2001 Buick Century Custom 3.1L Excessive Emissions, Misfire VIN: 2G4WS52J11
There were alot of replies asking about injectors, we all know how difficult these are to access. I listened to each one that I could get at, no change when missing. All specs appeared to be correct. I was at wits end so I decided to relearn all of the sensors...
2001 Cadillac DeVille 4.6L mode door actuator VIN: 1G6KD54Y01
Thanks to Juan [...] from California!!! He gave me very detailed instructions on positioning levers correctly. I was able to get a picture from gm service info that showed positions of the levers, BUT, I had to go by Juans suggestions to make it work out. The...
1989 Chevrolet Corvette 5.7L No Start, Poor Idle Quality VIN: 1G1YY3181K
As almost all of you said the injectors were the culprit. When I ohmed them out 4 of them were in the 6 to 7 range and the new ones were I think about 16. Thanks again
1992 Chevrolet C1500 Cheyenne 5.7L Starting VIN: 2GCEC19KXN
Well, once again you guys did it. A new shaft fixed the problem. This site is the best. Thanks again
1994 Chevrolet Camaro Z28 5.7L Excessive Emissions VIN: 2G1FP22P2R
Well after all repies and thinking of the original diag. I told the customer a better quality (OEM) Cat.converter is required. All pre-Cat gasses looked good and I felt a good Cat should be able to lower Nox within Spec.I beleive the egr will not be commanded ...
1999 Chevrolet Silverado 1500 4.3L Hesitation, Surge, Cuts out VIN: 1GCEC14WOX
Unfortunatly, the truck has been running with out a glitch. I got the best feedback from the tech forum. I posted the scope patterns there from the waveform library. That's what I tried to do with this post, but I don't think many looked at them. I reinstal... Trouble codes: P0339 (CKP CKT. Intermittant).
2006 Chevrolet Silverado 1500 LT 5.3L transfer case VIN: 2GCEK13Z26
I just wanted to thank all of you that responed to my post . We found that the tires were the same size but were different brands . There was a difference of 1/2" between the front and rear tires . Thank you all
2000 Pontiac Grand Am SE 2.4L Poor Idle Quality, idles high VIN: 1G2NF52T7Y
disconnected the batt performed relearn car ran rich for so long the adptive strategy had iac learned postion to cover the extra fuel from leaking fuel regualtor
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