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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 22, 2010
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Open Help Requests for GM
Help Request Answers
1991 Buick Century Limited 3.3L Stall VIN: 1G4AL54N5M
Heelo all, Got a 91 Buick giving us some grief. This thing will stall when warm and not restart sometimes for hours, sometimes in 15 minutes. When it stalls, it still has good spark, but a weak injector signal. It does not run on carb spray. It's very typical...
1994 Buick Park Avenue Ultra 3.8L Hesitation, Cuts out VIN: 1G4CU5212R
Hey everyone I got a 94 park ave ultra in today that a few different people must have seen before me. The owner gave me a list of what has been recently replaced Intakes, Injectors fpr fuel filter wires plugs cleaned throttle body crank sensor and a couple of ...
1984 Chevrolet Corvette 5.7L Lighting VIN: 1G1AY0783E
Good afternoon techs. I have a 1984 corvette and i can"t seem to find the right side headlamp motor relay. All data lists an individual relay for both left and right motors but i cannot locate either. If anyone has any idea where they might be hidden or if if ...
1987 Chevrolet S10 Blazer 2.8L coolant VIN: 1GNCT18R4H
We have oil getting into the coolant. And no coolant in the oil. We had the heads checked at a machine shop. No cracks were found. The old head gaskets looked good. After giving vehicle back to customer, everything was fine for about 2-3 weeks. Now it is back ...
1994 Chevrolet S10 Blazer 4.3L Poor Idle Quality, Surge VIN: 1GNDT13W1R
Picked up this Blazer with a cracked engine and decided to make it a project. Installed reman. engine as stated, and all ignition, fuel sytem and most sensors. Fuel injector and fuel pump are Delphi, EGR is ACDELCO as are ignition parts. Runs well, no codes ,b...
1995 Chevrolet K1500 Silverado 6.5L Excessive Emissions, No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2GCEK19SXS
my interest is knowing what fuel trims are based on. with no o2 or maf if you had this with - or + fuel trims where is the logic
1996 Chevrolet Impala SS 5.7L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1G1BL52P3T
Car will start but runs rich hot or cold, once it runs, it runs great, o2 readings rich,fuel trims trying to take away fuel, fuel presure reg not leaking. Trouble codes: P0141, P0161
1997 Chevrolet Cavalier 2.2L Engine VIN: 1G1JC1242V
This is my personal vehicle. I did an engine swap to this cavalier about 2 years ago. It now has a 3400 OHV V6 out of a 2002 Grand Am GT. Dyno tuned. It has bigger fuel injectors out of a Trailblazer, and stiffer valve springs. The car has ran great for the pa...
1999 Chevrolet Tahoe 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GNEK13RXX
Customer brought vehicle in complaining of missfire and back-firing first thing in the morning, after engine warms up vehicle is fine. No CEL's. Let it sit over the weekend and vehicle would not start unless holding throttle 50%. Installed fuel pressure gauge ...
2000 Chevrolet Silverado 1500 4.3L Misfire, MIL Lamp on VIN: 1GCEK14WXY
Techs, Inherrited this vehicle from aonther shop. New fuel and ignition parts everwere. Vortec 4.3 V6 in a C/K pickup application. Runs perfect unless you are cruising down a slight hill. Downhill only. You can feel it get rough and watch the Tech 2 missfire ... Trouble codes: P0300 (Multiple cylinder missfires)
2001 Chevrolet Silverado 2500 HD 6.6L Poor Idle Quality VIN: 1GCHK24131
Ran a scan test with no codes. Did a cylinder balance test. We we killed #1 cyld. The problem went away. We replace the #1 injector, but stiil have same problem. Not sure where to go from here. We dont have much info for this vehicle.
2001 Chevrolet Blazer LS 4.3L Brake Pedal VIN: 1GNCT18W51
Vehicle had poor brakes and a pedal that would go almost to the floor is pressure was kept on it. We replaced front pads and rotors and a rear caliper that was bad. Vehicle stops fine now, but brake pedal still exhibits severe fading. Obvious problem is master...
2001 Chevrolet Impala 3.4L No Start VIN: 2G1WF55E81
just wondering if anyone ran across something like this// this car will not restart hot, once your done driving unless you hold the gas pedal and if it wont will start then you cant let go of the gas pedal// fuel pressure is at 58psi// spark is good and the ia...
2006 Chevrolet Malibu Maxx SS 3.9L Misfire VIN: 1G1ZW63186
this car has a miss on cyl 6 some misses on 2 and 4 . most of this is in mid warmup . is ok for the first 30 sec. then the the miss starts, goes to a dead miss on 6.after 30 min or so it will go to a slight miss.moved inj#6 to #4 no change on 6.moved inj wire ... Trouble codes: P0300, P0306
2006 Chevrolet Colorado WT 2.8L Vibration VIN: 1GCCS14816
This truck has a vibration that shakes the exhaust apart. Two mufflers have broken off and been covered by warranty. This was followed by several aftermarket mufflers at muffler shops. It has shaken the insides out of the rear converter and broken the weld at ...
2000 GMC Yukon SLT 5.3L compressor VIN: 1GKEC13T2Y
This vehicle came in for inop compressor i checked the r134 it was really low so i can evacuated, vaccum and recharged the system i turn it on and the compressor would not come on i used my scanner and order the compressor relay to come on system work as it sh...
2001 GMC Yukon XL 1500 SLT 5.3L ride control VIN: 3GKFK16T41
Air ride unit in vehicle failed. Client opted to have air ride unit removed and rear springs and shocks replaced with Bilstein conventional style. Now has "service ride control" on DIC. Anyone have ideas for how to convince the vehicle it no longer has ride co...
2004 GMC Yukon SLE 5.3L 4x4 system VIN: 1LGKEK13V9
The dash reads SERVICE 4x4 and the lights on the differential selector are not lit up. It wont engage into 4x4 and feels sluggish. This only happens sometimes and there is no check engine light on. Any thoughts?
1997 Pontiac Grand Am SE 2.4L Clatter in Engine VIN: 1G2NE52T6V
Customer wanted to know how much is a diagnostic for loud valve lifters!?!?!? We lisented to it and determined that exploratory surgery is needed inside the timing cover. Got cover off and didn't see anything obvious. Tensioner seemed a bit worn but nothing se...
2001 Pontiac Bonneville SE 3.8L unknown VIN: 1G2HX54K41
Vehicle came in with complaint of hot air from drivers side vents, cold air from passenger side. a/c system appeared to be fully charged - but we did an evacuate and recharge to be sure - made no difference in outlet temp. noticed that a/c line after orifice i...
2005 Pontiac Grand Prix GTP 3.8L Lighting VIN: 2G2WR52425
Hud display not working
2002 Saturn SL 1.9L fluid VIN: 1G8ZK52752
this saturn came in with a wining noise, found noise coming from tranmission area, found fluid to be over filled half way up the dipstick.. removed 2 quarts from trany and still overfilled halfway up the dipstick... turned engine of and no fluid showing at dip...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Park Avenue 3.8L entry lighting VIN: 1G4CW52K7T
Thanks everyone for taking the time to post. The customer picked up his vehicle, needed the car for a trip! I had already checked the fuses, door ajar switches, trunk and hood light and cluster illumination dimmer, I forgot to mention it while posting. The cus...
1997 Cadillac Seville STS 4.6L serial bus VIN: 1G6KY5292V
I can't say enough about how gratefully I am for IATn and its members. Thanks alot everyone who responded. It was Jerry from Georgia who knew that the prndl lights where flashing because the data bus was shorted and simply asked if the floor was wet! after tha...
1993 Chevrolet Camaro Z28 5.7L Hesitation, excessive pressure VIN: 2G1FP22P9P
Removed fuel tank and found that the evap purge valve hose and the evap pressure relief valve hose were pinched off underneath the tank. Rerouted these hoses correctly and it runs great. Thank you everyone for your help with this.
1997 Chevrolet Lumina 3.1L steering rack VIN: 2G1WL52M5V
Thanks for all the help 19 replies.Most said to rplace the rack. We installed a new rack with a good flush and problem is fixed.
1997 Chevrolet Express 1500 4.3L Misfire VIN: 1GCEG15W9V
I got some good replies, and checked a couple more things to isolate the problem. While the engine was running, I sprayed water on the ECM, and the miss started immediately. So I got a salvage yard ECM, but it still had an intermittent miss on #5, plus the tra... Trouble codes: P0300, P0305.
2002 Chevrolet Silverado 1500 LS 4.8L Inst Cluster VIN: 1GCEC14V32
2003 Chevrolet Express 2500 5.3L Master Cylinder/ABS VIN: 1GCFH25T63
The fix came down to replacing the rear brake calipers. We had the dealer go through the bleed procedure with no significant change. They had also suggested a potential problem with the front wheel speed sensors. We found no trouble witht he sensors. When w...
2007 Chevrolet Uplander LS 3.9L Abs Lite VIN: 1GNDV231X7
After the customer had been driving the van for a few days while we waited to hear from all of you on this forum, the abs light had not come back on in this van. So, when we contacted the customer about getting this back in to do some further testing they aske...
2007 Chevrolet Suburban 1500 LT 5.3L radio, dash lights VIN: 3GNFC16J87
Thanks to all who responded and quickly I might add. We originally had some bad intel that made us think radio would not turn off from either front door which led us to think it couldn't have 2 bad door latches. However Bill & Dustin were spot on, only the dri...
1993 GMC Safari 4.3L Hesitation, Misfire VIN: 1GTDM19Z1P
Unfortunately, the customer has opted to live with the intermittent check engine light as he is happy with the performance and we live outside of an emissions testing area. I suspect the EGR valve is the fault but cannot confirm. Thank-you all for your replies...
2004 Pontiac Grand Prix GT1 3.8L steering VIN: 2G2WR52404
Thank you to all who replied. After manufacutring and cap with a vacuum nipple in it and performing the bleeding procedure to no avail we replaced the pump with another napa pump and after doing the bleeding procedure still had the whine. the customer was pr...
2003 Saturn Ion-2 2.2L No Start VIN: 1G8AZ52FX3
Customer declined our repair ideas to go to Saturn. Dealer put starter in car, when customer came to pick-up paid 600 + for starter job and they had to push it back in the shop!? Still not fixed. Ha ha on them. We suggested that bcm is at fault, found several ... Trouble codes: U1301 (Class 2 circuit short to battery conditions).
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