GM Automotive Technicians Technical Discussion and Fixes for Mar 29, 2007

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Open Help Requests for GM

	Help Request	Answers
	1979 Cadillac Eldorado 5.7L ignition VIN: 6L57B9E614 engine will turn over, but does not fire until the key is released. we have found that by removing the ignition switch, it will work as designed, but go back to the same issue of not firing when the switch is reinstalled. we replaced the switch just to be safe...	View
	1996 Cadillac DeVille 4.6L Oil pump loses prime VIN: 1G6KD52YXT Help, Gurus! This fine ride first arrived three weeks ago from a different garage that did not have the capability for replacement of the oil pan. Other shop had already done subframe but didn't realize what they were in for to gain access to the pan. Anyway.....	View
	1999 Cadillac Escalade 5.7L radio VIN: 1GYEK13R8X Hello and thanks for your help! I hope you are having a better day then mine! Cust brought in the truck with a bad cylinder head. Dealer told him to replace engine. I found a tsb about main bearing clearance, so we pulled engine and rebuilt. Truck runs great, ...	View
	1989 Chevrolet K2500 Cheyenne 5.7L No Power VIN: 1GCGK24K7K Customer complaint of poor power, can barely pull itself out of mud, very slow acceleration. Inspected and adjusted timing to factory specs. Inspected fuel pressure and volume, factory specs. Removed exhaust to check for back pressure and no difference. This v...	View
	1990 Chevrolet Corvette 5.7L Stall, starts-stalls VIN: 1G1YY2387L Hi everyone,this vehicle came in on the hook with a engine quit/stalled complaint while approaching an intersection. I first went to the car, it was about 4 blocks form my shop, and attempted to drive it to the shop. I was able to get it started, but it ran ro...	View
	1998 Chevrolet Cavalier LS 2.4L pedel VIN: 1G1JF52T1W Good evening to all I have this 1998 chevy cavalier that has a VERY hard brake pedel.I have checked all base brake system parts all ok.I had to replace rear drums due to severe rust also cleaned and adjusted rear shoes.Found right front caliper hose twisted fi...	View
	1999 Chevrolet Venture 3.4L Misfire, Misfire #4 Loaded VIN: 1G2HX53L9P This vehicle is due back to me next Wednesday. Would like to know if someone has any bright ideas on what I could be looking at here. Truly feels like an ignition drop, but I am starting to believe my spidy senses are wrong on that. Changing out an injector on... Trouble codes: P0300 (Datastream indicates cyl 4 misfires - 4000RPM and up half throttle or more)	View
	1999 Chevrolet C1500 LS 5.7L No Start, Security Light On VIN: 1GBEC19ROX As Mentioned before, another repair shop installed a used engine in this truck and did not hook any of the harness grounds up. The interior dash harness had shoted out and melted the plug and wires on headlight switch down to the fuse block. The truck came to ... Trouble codes: P1631	View
	2001 Chevrolet Cavalier 2.2L Reat Brakes VIN: 3G2JB52481 Hi Everyone, this car is giving me fits! The rear brakes violently grab the first few stops and after that they work perfectly. We originally replaced the rear shoes, drums(the original shoes were only 1/2 worn but the drums were egg shaped. Brakes worked fine...	View
	2002 Chevrolet Express 3500 6.5L Horns VIN: 1GDJG31F52 Hello all, I have a cube van here that keeps blowing the fuse AND taking the horns with it. I don't want the van to come back 2 weeks from now with the same issue. Horn switch and relay are working fine. I didn't have the time today to test the circuit. Is thi...	View
	2003 Chevrolet Impala LS 3.8L Door locks VIN: 2G1WH52K23 Vehicle came in with a door lock not working complaint; replaced fuse - locks work. Also has an intermittant "Security" light flashing. One time while at my shop, it wouldn't start and the exterior lights stayed on continuous. Vehicle has had no starting troub...	View
	2004 Chevrolet Silverado 1500 4.8L cannot fuel vehicle hello, and thanks in advance for any help. this chevy came in because the customer could not fill the gas tank. pump would click off every 50-75 cents. it also had mil on, po446,evap vent control problem. removed evap vent solenoid, found it was stuck shut. re... Trouble codes: P0446	View
	2005 Chevrolet Silverado 1500 LS 5.3L 4 x 4 VIN: 2GCEK13T45 neutral light stays on all the time on the 4 x 4 selector switch mounted on the dash. vehicle is stuck in 2 wheel drive and will not engage into 4lo or 4hi (lights just flash). ran checks with scan tool. can activate all 4 x 4 lights. have already replaced sel...	View
	1994 GMC C3500 Sierra SL 7.4L Poor Idle Quality, Stall VIN: 1GDJC34N6R this thing came to us from another shop it wont idle its had everything replaced map iac tps computer dist cap wires rotor throttle body coolant temp sensor if i put a hand vac pump on the map the vac comes up to 18-19in and it will idle it also had the intake...	View
	1998 GMC K1500 Sierra SL 5.7L Steering Control VIN: 2GTEK19R1W This Vehicle, When Driving Straight Ahead, Will Suddenly Jerk Or Snap The Steering Wheel To The Left & Release. Won't Do It To The Right. The Steering Pump Has Been Replaced By Someone Else Not Long Ago Because Of A Leak & Customer Says The Steering Issue Wasn...	View
	1999 GMC Jimmy SL 4.3L batt draw. VIN: 1GMNBGH563 got a batt. draw ,batt new found source of draw at alt. replaced alt, still there, the fusible link wire blue wire is the draw. on mitchelles tells me to go to power distribution source from there i have nut had time to pin piont.. i pulled all fuses and relay...	View
	2002 GMC Sierra 2500 SL 6.0L Rear wheel speed sensor and speedometer VIN: 1GTGK29U72 This 4WD lifted truck has a problem in the ABS system. It sets a code C0238-Wheel speed mismatch-after about 2 miles of driving. The customer bought it used from a local dealer and it was already modified in its present condition. He says the ABS warning lamp ...	View
	2005 GMC Sierra 3500 6.6L no fuel transfer VIN: 1GDJK34295 Code PO2636 comes up. Fuel gauge quites, transfer pump quites. Code may take a few days to come up. This problem does not occur during fueling, it happens while driving. Trouble codes: P2636	View
	2005 GMC Envoy SLE 4.2L head bolts VIN: 1GKDS13S65 Need some help. Especally GM techs. The vehicle came to us from another shop and aparently they drilled through the exhaust manifold water chamber. we were asked to remove head and replace. Upon removal, Head bolts started breaking off. Is there some method im...	View
	2001 Pontiac Grand Am GT 3.4L MIL Lamp on VIN: 1G2NW52E11 This car came in with MIL on for O2 heater circuit. Have replaced O2 sensor twice. Checked for power and ground both are OK. Alldata test indicates to replace PCM. Do not want to replace without being positive. Any insight will be greatly appreciated. Trouble codes: P0030 (O2 Heater circuit malfunction B1S1)	View
	2000 Saturn SL 1.9L engine VIN: 1GBZK5273Y after the engine was rebuild the car was used as a shop car for about 6 months and 1000-1500 miles, no problems or leaks, we sold the car and with in 2 days it came back using 3 quarts of oil a day and smoking heavy, all the cylinders except #1 were dry. compr...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1993 Cadillac DeVille 4.9L Hesitation, Surge, Misfire VIN: 1GTER56SEP the trouble was the #1 fuel injector shorting out causing computer to short and drop signal to other injectors. thank you all for all your help!!! replaced #1 injector and replaced computer again.	8
	1998 Cadillac DeVille 4.6L Radio VIN: 1G6KD54Y8X Thanks for all the input. We had the gm dealer reset it for us. Steve	5
	2000 Cadillac DeVille 4.6L compressor VIN: 1G6KDS4Y2Y First I want to say thanks for all the info. There ended up being two seperate problems. One the pressure sensor had gone bad and the second was the mode door arms had came apart. I had to go into a 2001 model to find the codes under dash integrtion option. Th...	16
	1998 Chevrolet K1500 Cheyenne 5.7L converter shift flair VIN: 1GCEK19R5W ok guys sorry about the delay. any way i read all of your replys and fallowed most i checked the TPS and found to be clean in movement i could not locate a scanner that would allow me to monitor tcc apply then one of my buddies directed me to a hole in the wal...	18
	2002 Chevrolet Malibu 3.1L ABS Light VIN: 1G1ND52J62 Thanks for all the replies. Found corroded wire in the wire loom under the battery box. replaced both wires to the ABS wheel speed sensor and verified the repair by driving at all verious speeds and found thery matched all the others. Thanks again for the help...	8
	2003 Chevrolet Express 3500 6.0L MIL Lamp on VIN: 1GCHG39U03 Thanks to all that replied!!! Problem was in wiring harness that ran down by front suspension, repaired rubbed through wire harness and all is ok!!! Thank you all again!!! Tim Trouble codes: P0357 (ignition coil g primary circuit problem).	3
	1991 Oldsmobile Cutlass Calais 2.3L Surge VIN: 1G3NL14D0M As I suspected there was a logic issue in the computer, I ordered a new 'Updated' EEPROM and the vehicle runs perfect, and passes a IM240 test with ease. thanks for the replies. I hope this info will help someone in the future!	4
	1994 Oldsmobile Cutlass Supreme 3.4L injectors VIN: 1G3WT35X1R the problem was the idiot who owns this car pulled the starter out and pulled the hi referance wire out of the ignition module, put it back boom it runs like a cement mixer, but it runs	6
	1996 Pontiac Grand Am SE 3.1L No Start, Stall VIN: 1G2NE52M5T i deadheaded the fuel pump and the pressure went from 31 psa to 20 and the vehicle would die. Never seen one run at 30 psi or go lower deadheading but... a new one fixed it. thanks everybody.	10
	1997 Pontiac Grand Prix GT 3.8L headlights VIN: 1G2WP52KXV Well this car was one example of it being a good thing to have to many cooks in the soup! Everyones responses were good feedback and gave me ideas of were to look for failures. But Ray at [...] electric and Larry from Ontario were dead on the money! After taki...	16

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