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Professional Automotive Repair Technical Discussions for September 29, 2009 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 1976 Cadillac Eldorado 8.2L power ECM VIN: 6L67560178 CAR WILL NOT START has bliking ant-theft light on dash after un locking door with key.I have no power to coil (HEI)I have power on the pink wire at fuse box.how do I reset my anti-theft or a wiring dyagram of this system so that I may by pass it.Also where is ... |
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| 1976 Cadillac Eldorado 8.2L Horns Hey there gang, I have a 1976 Cadillac Eldorado that I cannot find the horn relay for. I have traced the wiring from the horns and they go straight into the interior compartment so I know it's not under the hood. I have searched high and low inside the vehicle... |
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| 1998 Cadillac DeVille 4.6L No Start, Stall VIN: 1G6KD54YXW This Cadillac is driving me insane. Will run for 3 seconds if you turn the key off then crank. Dash is going nuts prnd2l is flashing, air bag light is on, traction light is on theft system problem flashing fuel econ reads blank. No communication thru scanner. ... Trouble codes: U1255 |
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| 2003 Cadillac Escalade 6.0L aux temp actuator VIN: 1GYEK63NX3 System was diagnosed with a bad mode door actuator. Installed new actuator. System worked good. Hours later similar problem. Actuator won't come off cold position. When actuator is set to the center position as soon as system is turned on regardless of temp po... |
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| 1986 Chevrolet Corvette 5.7L lean VIN: 1G1YY078SG Car came in running sorta rough especialy at idle. Tested injector resistance and they are withing .1 ohm of each other at 12.1 ohms. fuel pressure 43 PSI, goes to 50 if you pull regulator hose off. Had code for EGR so I pulled it out and replaced it for not w... Trouble codes: 32 (egr problem) |
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| 1988 Chevrolet Beretta 2.8L No Start VIN: 1G1LV11W5J happy friday! i've got this beretta here that has no inj. pulse. read all the fixes and i believe it has a fault somewhere in the DIS system or maybe ecm. the question i have is...my rpm is reading 9999 on the Modis. has anyone seen this before? KOEO , tps is ... |
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| 1998 Chevrolet S10 4.3L No Start VIN: 1GCCDS19X3 Hey Techs! I have this S-10 that is going through fuel pump modules like nothing else, we have replaced 3 within the past 4 months and its in again with a bad fuel pump. I am using aftermarket, but a good brand. This truck is used at a corrections facility so ... |
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| 1998 Chevrolet C1500 Silverado 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge VIN: 1GCEC14W9W thanks in advance guys.this has been a good one.SITTING STILL AT IDLE THE ENGINE RUNS PRETTY SMOOTH.WHILE DRIVING AT ABOUT 1500 TO 2000 RPM THE ENGINE STARTS TO BUCK AND SPARK KNOCK "REALY BAD".AT FULL THROTTLE IT SMOOTHS BACK UP AND RUNS GREAT.ALL FUEL TRIM N... Trouble codes: P0300, P0339, P1404 |
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| 2000 Chevrolet Astro 4.3L No Start VIN: 1GNEL19WXY This vehicle sits for long periods of time as a family back up unit. Battery was recently replaced. The customer had a service provider on the road replace an "ECM" fuse. It looks to be ECM-1 fuse (cleaner than all the rest). It had stall on him and no restart... |
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| 2000 Chevrolet Cavalier 2.2L track off light on VIN: 1G1JC1246Y hi custumer stats trac off light stays on. I scanned with snap on scanner and found c1275-pcm serial data malfunction. Checked out alldata basically says to check for loose connection. Tried to reset memory but code comes back imediatlly! Can anyone help or su... |
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| 2002 Chevrolet Impala 3.8L Radio VIN: 2G1WH55K62 An intermitant hissing noise is coming out of front speakers even with radio off. Customer brought the car by to show me the "frying egg sound" as it was happening. I checked for the source of the noise and it was coming from the front speakers on the door rig... |
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| 2006 Chevrolet Silverado 2500 HD LS 6.0L Poor Idle Quality, Misfire VIN: 1GCHC24U11 Ok chev. buffs,this problem occurs mostly on start ups sometimes when just @ idle.Drivers side all 4 cyls. drop out. it has injector pulse, when i go to check spark problem goes away eng.runs fine, when you turn eng. off then start it runs fine also. Trouble codes: P0300 |
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| 2007 Chevrolet hummer 3.7L brakes VIN: 5GTDN13E17 please can help me resolve this problem is my first time working with a hummer under flood.i put a new abs sensor.pads rotors disc.brake fluid but nothing happend.thanks for help me. |
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| 1991 Oldsmobile Cutlass Supreme SL 3.4L No Start VIN: 1G3WS51X0M hey folks! ive got this cutlass thats an intermittent no start. there is no spark at the wires when it happens. unfortunetly i was only able to do a small hand full of tests before it fired up and has ran since. i had key power at the ignition module and the c... |
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| 1997 Oldsmobile 88 Royale 3.8L No Start VIN: 1G3HN52K9V spin over no start windows not working or door locks if we ground ground wire on fuel pump car will crank and windows work let off ground car cuts off .checked all ground .good new battery and terminals |
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| 2001 Pontiac Aztek 3.4L No Start, Poor Idle Quality, Cuts out VIN: 3G7DA03E51 Vehicle was towed in with complaint of no-start and overheating when vehicle was running. Customer had only a copy of the key, went to dealer and had key made and programmed. Vehicle would start but not stay running unless you have your foot on the gas. Found ... Trouble codes: P1189 (engine oil pressure circuit) |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 1998 Buick Regal LS 3.8L Starter VIN: 2G4WB52K8W Thanks to all who replied ...the problem was the ignition switch when testing the switch it tested ok but when the car was under load it would loose voltage...12 volts with no load but dropped 3 volts to 9 volts when all accesories were turned on...thank you a... |
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| 1985 Chevrolet K20 Scottsdale 5.7L Stall, Misfire VIN: 1GCFK29K7S Thank you for all your help. I have fixed this one with a new fuel pump. Several suggested distributor problems which I was suspecting because of the timing of the stall. I believe my fuel line was getting air in it and causing the stall. I always had fuel pre... |
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| 2001 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on VIN: 1GCHK29131 Sorry for the late fix. I manually checked boost and was at 22 psi. Checked wastegate operation - operating at 24 psi, lever free and holds vacuum. So, everyting mechanicly and electric related seems to of been good. I am thinking the wastegate opening at 24ps... Trouble codes: P0134 (turbo over boost). |
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| 2002 Chevrolet Suburban 2500 LT 6.0L Misfire, MIL Lamp on VIN: 2GNGK26U62 thanks to everyone that posted suggestions for this problem. I performed a crank variation relearn as several of you suggested and it fixed the problem! After numerous road tests, all misfire counters remained at zero and, of course, no more misfire codes. I ... Trouble codes: P0300. |
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| 2002 Chevrolet Malibu 3.1L Cuts out, Stall, Misfire VIN: 1G1ND52J62 This Malibu has been fixed but not by our shop. After checking CKP and CMP signals at the PCM I figured it was a problem in the PCM. Customer took it to a GM dealer where they replaced the PCM, car is running great now. Trouble codes: P0336, P1374. |
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| 2004 Chevrolet Cavalier 2.2L No Start, MIL Lamp on VIN: 1G1JH12F84 After calling the customer to verify that there were no other repairs and/or any new or used parts installed on the vehicle, he notified me that they have not experienced the no start since I posted this request for help. Many of you expressed concerns with u... Trouble codes: P1631 (Theft-Password incorrect), U1064 (Loss of communication BCM/DIM/SBM), U1000 (Class 2 data link fault), B2960 (Passlock cylinder data incorrect), B1000 (ECU malfunction). |
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| 2004 Chevrolet Colorado LS 3.5L air bag VIN: 1GCDT19664 Well thanks to all that replied. Bob was right about the broken wire in the back door. The two wires were broke and the customers brother found them and never told us that he had stuffed them down in the door piller. We also did change the clock spring assembl... |
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| 2005 Chevrolet Equinox LT 3.4L Starting VIN: 2CNDL73F65 thanks to all who replied attempt to start leave key on wait till security light goes out approximately 10 mins turn off wait 5 seconds and repeat two more times then start vehicle |
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| 2006 Chevrolet Express 3500 6.0L TRANS temp VIN: 1GAHG39U67 THANKS to those who replied. upond further inspection we knew oil return flow was no the problem what we didnt know was oil flow back inside trans.we placed air blower on return port of trans and notice restiction remove trans tear down and found supplier mix ... |
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| 2003 GMC Sierra 2500 HD SLT 6.6L MIL Lamp on VIN: 1GTHK23141 AFTER PULLING OUT MY HAIR AND FINDING OUT THAT CUSTOMER REPLACED BARO WITH A NAPA PART,I REPLACED WITH AN OE PART & CORRECTED THE PROBLEM.THANKS TO ALL WHO HELPED. Trouble codes: P0108. |
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| 2003 GMC Envoy XL SLE 4.2L radiator VIN: 1GKES16S13 I would like to thank all those who helped with replies. I took the suggestion of sniffing the cooling system with a gas analyzer and found around 250ppm of hc. ended up removing the head and replacing the head gasket. sorry it took so long to post the fix. ju... |
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| 2004 GMC Sierra 3500 6.6L fuel gauge VIN: 1GDJC34264 Ok the fix for the fuel guage issue is fixed.Cure was the tanfer pump,pumping but no fuel transfering to front tank.Put tech 2 on it and seen that sending unit cards between both tanks percentages were uneven thus putting guage to empty and low fuel lite comin... |
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| 2000 Pontiac Montana 3.4L fuel guage VIN: 1GMDX03E6Y thanks to all,the cure was a new sending unit in the tank,could not locate a replacement without buying the whole module,i did scope the pump befor replacing and it was good,anyway this guy ended up with a new one,it is good to know all you guys are out there,... |
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| 2002 Saturn L300 3.0L Surge, MIL Lamp on VIN: 1G8JW54R92 Thank you robert,william,@frank.Installed 2nd ecm so far all is well.Voltage returned to normal.Best wishes. Trouble codes: P0405. |
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| 2002 Saturn Vue 3.0L Hub & Bearing VIN: 56GZCZ63B9 Thank you all for your help. Most recommended taking complete Spindle, Axle, Bearing assembly out and put it in a Press. That's what I ended up doing. For those suggesting an air hammer, I tried but no luck. I actually bent a 20 ton press getting the axle out.... |
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