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Prev Professional Automotive Repair Technical Discussions for June 7, 2005
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Open Help Requests for GM
Help Request Answers
1993 Buick LeSabre Custom 3.8L 2-1 shift VIN: 1G4HP53L8P
this buick came in with a complaint that it goes into nuetral when coming to a stop and trying to take off. i checked the fluid and it was low and dark in color, but not black. i decided to change the filter and gasket, this would give me a chance to see if th...
1994 Buick Regal Custom 3.8L Poor Idle Quality VIN: 2G4WB5517R
Hi Everyone, This car came to us with an idle problem that increses anywhere from 900 to 1600 rpm's. The customer states that when it starts idling fast he pulls over and restarts vehicle. He says the problem goes away for awhile. We replaced the IAC motor tw...
1999 Cadillac DeVille 4.6L leveling system VIN: 1G6KD54Y5X
hello everyone, this car will activate the pump and raise the car when weight is applied to the back but when you remove the weight the car stays up, according to the wiring diagram the exhaust solenoid is ground side switched by the leveling sensor, there,s p...
1990 Chevrolet Corvette 5.7L Temperature gauge VIN: 1G1YY33801
This Corvette's temp gauge reads hot when its been run for a length of time. The fact is, it's not hot. Scanner shows fan coming on at 229 degrees and off at 215. Raytech temp gun agrees. Test gauge with a sensor simulator set to resistance readings given in M...
1993 Chevrolet S10 Blazer Tahoe 4.3L 1-2/2-3 VIN: 1GNDT13W8P
Hello trans techs, vehicle came in no up shifts scanned code 66 67 81 82 found. check wiring ecm-trans good. Vehicle starts in 3rd in D unless in manual 1 I need help.
1995 Chevrolet Corvette 5.7L driveline VIN: 1G1YY32P9S
The car has never been in a shop. It has only 13,000 miles on it. Customer explained that they were driving when they heard a loud "bang" but did not hit anything in the road. Since then, the vehicle has an intermittent vibration in the driveline/engine. I ver...
1998 Chevrolet K1500 Cheyenne 5.7L Hesitation, Surge VIN: 1GTP675KRG
This vehicle hesitates slightly to moderately on accel and surges some at cruise- we think it drives pretty good but noticed slight accel hesitation after parked for some time. Heres the timeline: Customer towed in a couple months ago dead- we replaced fuel pu...
1999 Chevrolet Venture LS 3.4L Misfire VIN: 1GNDX03E2X
after driving 20 minutes (hot) , starts to missfire (8-10 misses very small) not even big enough to tell what cylinder happens very quickly, you can feel the car skipping. seems to be worse when turning and pulling away. Any ideas?? Chad [...]
1999 Chevrolet Express 3500 5.7L Hesitation, MIL Lamp on VIN: 1GBJG31RXX
When this symptom does finally happen the O2 sensors drop to about 40 mv and there is no throttle response.Also the long term fuel trim stays about 121-125.All sensors seem in spec except the O2's. I would think the LT fuel trim would start to rise but it does... Trouble codes: P0131, P0151
2002 Chevrolet Trailblazer LS 4.2L blower moter VIN: 1GNDS13502
hello fellow techs Have a strange one here also customer has limited time got this one in customer complains of no blower motor operation, also when blower motor dosen't operate abs light is also illuminated, run a scan using otc scan tool got no power to abs ...
2003 Chevrolet Express 3500 6.0L Overheating VIN: 1GBJG31433
This is a Fedex ground van that i have been battling for overheating. I replaced the water pump due to a leak, it still overheated, i replaced the water pump again per the customers request and still running about 240. Then i put in a new thermostat, fan clutc...
1993 Geo Tracker 1.6L no tcc lockup VIN: 2CNBJ18U1P
Vehicle entered shop for fluid consumption problem, smoking. Replaced modulator. Noticed there was no lockup on test drive. Tested tcc relay, brake switch and checked for voltage to trans case then replaced tcc solenoid and gov press switch. Now we have lockup...
1998 GMC K1500 Sierra SL 4.3L Misfire, MIL Lamp on VIN: 1GTEK14W9W
Reoccurring code returns P0300, misfire counters storing misfires on all cylinders, excessive misfires occurring on current misfire counters for cylinders #1 & #4, ran fuel injection cleaning on fuel system. Replace injectors #1 & #4. Misfire apparent at R.P.M... Trouble codes: P0300 (Multiple cylinder misfire)
1998 GMC Safari SLE 4.3L brake pull to the left VIN: 1GKEL19W3W
After flushing brakes about a month ago, customer came in with a brake pull to the left.checked brake hoses. flowed ok. Pulled lines at abs controller and monitored flow out of controller at fitting that leads to both front brakes.The right side circuit requir...
1997 Oldsmobile Aurora 4.0L No Start, Hard starting VIN: 1G3GR62C6V
Vehicle will randomly either not start or will act like way out of time or exsesive cranking to start. Then next time will start like a dream. Problem more predominate after long sit time but could happen imediatly after shuting vehicle off. Have checked all t...
1996 Pontiac Grand Am SE 2.4L radiator VIN: 1G2NE12T8T
After successfully changing the waterpump in this car(my sons), I'm having a bear of a time bleeding all the air out of the system. I installed a new 180 degree thermostat. The pump had a hair line crack in it. Everything gets hot -hoses ,radiator etc but it k...
1998 Saturn SL 1.9L High Idle VIN: 1G9ZF5288W
This car starts and idles normally, except for an intermittent high idle that has continued after replacing coolant temp sensor and pigtail. It still sets P0507 code. All scan data seems normal except IAC counts always read zero. I reviewed a couple of movies ... Trouble codes: P0507 (Idle Control System RPM too high)

Fixes & Summaries for GM
Fix/Summary Answers
1993 Cadillac Eldorado Touring 4.6L Poor Idle Quality, MIL Lamp on VIN: 1G6EL1292P
a few replies that might be helpfull. 2 replies to check for poor grounds at bracket near starter. for some reason, removing cleaning and retorquing cables seems to cure some problems. also fuel pressure regulators leaking causing to flood one bank of the engi... Trouble codes: P0046, P0083, P0137, 1032, A037, T072.
1998 Cadillac DeVille 4.6L Battery VIN: 1G6KD54Y6W
Well, we got a few replies. Ended up being the blower motor that was the draw. This should have been a clue at first because the motor did not work. This motor has the module as part of the motor so it was pricey. Customer was glad to have it fixed, and so am ...
1998 Cadillac Eldorado ETC 4.6L rr brake light VIN: 1G6ET1297W
The fix ended up being the brake light switch, There are multiple wires on this switch and I miss probed the pin for the RR brake lt signal. Thanks for the replies
1989 Chevrolet Astro 4.3L "Y"-pipe VIN: 1GCDM15Z2K
probable lean condition to right bank (injector/base gasket/?) Veh PASSED state emissions so won't be fixed 'till 'needed'
1994 Chevrolet Beretta Z26 3.1L Hesitation, Surge, Poor Fuel Economy, MIL Lamp on VIN: 1G1LW15M5R
A huge thanks to all, customer stopped in yesterday and proclaimed the Beretta is good as new. I had a pile of great suggestions but, Christopher from Florida nailed it. The power steering hose had been leaking for what looked like years. It was just replaced ... Trouble codes: 44 (Fuel system lean).
1999 Chevrolet Lumina 3.1L Hesitation, Misfire, MIL Lamp on VIN: 2G1W152M7X
Thank You for all of your help / assistance. The wire for Cylinder one was bad. Thus, giving a code for random misfire; when you look up the code (DTC), it reads as a bad cam or crank sensor(very misleading). A new set of plugs & wire did the job. THANKS! Trouble codes: P0300, P1381 (Misfire detected - no ebcm / pcm serial data).
1999 Chevrolet Blazer 4.3L flasher VIN: 1GNDT13WXX
Sorry about not reading the first part of the post section better. I found out where he had the Blazer before me, and I don't care for that shops work. Got ahead of myself. Anyway, got the Blazer in this morning and yes it was the multi function switch. Replac...
2000 Chevrolet Silverado 1500 4.8L Cooling Systems VIN: 2GCEK19T9Y
Thanks for all the replies, there was a slight external coolant leak at the front of the passenger side cylinder head, so I thought I would remove it to 'see what I could see'. It turns out that there is a 1 inch square coolant port at the front of this head a...
2001 Chevrolet Suburban 2500 8.1L temp, fuel and trans temp gauges VIN: 3GNGK26G31
Thanks to Bob, Clyde and Randal. I was pretty sure about the IPC when I posted; enough that I had packed the unit for shipment when the replies came in. The vehicle was acting up when brought to my shop. We got the scanner on it, pulled codes and scanned s...
1993 Oldsmobile Silhouette 3.8L Poor Idle Quality, Hesitation VIN: 1GHDU06L6P
i tried another egr w/ no change. i removed upper and lower intake and resealed w/ no change. i removed timing cover and found harmonic balancer not installed properly which affected crank sensor and timing. note timing chain was ok but lower gear cracked as a...
1999 Oldsmobile Intrigue GX 3.8L Starter VIN: 1G3WH52K6X
Hi Guys! We got her fixed! My daughter was helping me and I let her attempt the diagnostics. She read all your responses and obtained a electrical diagram and went nose to the grind stone. She didn't get far before she found the problem. After checking mos...
1997 Pontiac Grand Prix SE 3.1L Panel Air Flow VIN: 1G2WJ52M8V
Thanks for all the replies, and I would like to apologize for wasting everyones time. The car had about a 35% charge in it.I would have checked this before posting a help request (as I understand that it's proper protocol) but my customer was just too busy to ...
1998 Pontiac Trans Sport Montana 3.4L power door VIN: 1GMDX03EXW
Thank you to those who replied, after performinf the relearn procedure on the sliding door module it worked fine and has been working ever since.
1999 Pontiac Grand Am SE 2.4L No Start VIN: 1G23NE52T9
1998 Saturn badge_gone 1.9L Hesitation, Surge VIN: 1GBZG1278W
Many Thanks to all who replied. Although this is a 'close' notice, I may open another request on this same vehicle. The running fault about which I previously posted, is now fixed. It was being caused by a catalytic converter which had internally disintegrat... Trouble codes: P0463 (1599 -), 1599 (1620 - learn fault), 1620 (learn fault), 1624 (tcm-ecm).
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