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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for January 28, 2009
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Open Help Requests for GM
Help Request Answers
1993 Cadillac Fleetwood 5.7L No Start VIN: 1G6DW5277P
vehicle came into shop on hook, cranks but no startup. has 13 psi fuel pressure. no spark at the coil. no injector pulse at either injectors! we replaced ign module and distributor. the vehicle still does not have spark/pulse. still no start. any help would be...
1997 Cadillac Eldorado 4.6L head gaskets VIN: 1G6EL12Y7V
I need a little insight on a 97 caddy eldorado 4.6 I'm getting exhuast gas in the coolant. An the customer stated that it did get hot. My question is when changing head gaskets do you put all the inserts in for your head bolts right away or do you try torque t...
2004 Cadillac CTS 3.2L MIL Lamp on, will not run evap . VIN: 1G6DM57714
Vehicle originally had o2 fault code and evap large leak code. Replacement of o2 sensor repaired o2 code. Fuel system was lowered down and leak diagnostics performed with "smoke machine". We were unable to locate any leak. Reassembled fuel system and now we ar... Trouble codes: U0001
1984 Chevrolet Corvette 5.7L Mechanical VIN: 23456RTYUI
Hello tranny tech's. This is my personal car so i have decided to make it a ginea pig for my learning. Its Doug nash super T10. I have it tore down and have a question about the gears? The dog teeth are worn on all the gears, not chipped or broken, but have be...
1990 Chevrolet Camaro RS 3.1L passkey decoder VIN: 1GIFP23T6L
Thanks in advance to everyone...Passkey Decoder Module Problem. What I have here is a very tired Camaro. The customer was driving and suddenly his car quit running. After a series of tests, we determined the correct resistance in ohms was at the pellet on the ...
1993 Chevrolet K1500 Cheyenne 4.3L hard 1-2 shift VIN: 1GCEK14ZXP
This truck has a neck jerking first to second shift. Doesn't matter if going slow or fast, still jerks super hard. A known professional transmission expert rebuilt the tranny twice and problem remains. Vehicle has the 4L60E four speed transmission. Have checke...
1996 Chevrolet Camaro 3.8L timing VIN: 2G1FP22K9T
I am not sure about the timing marks. Mitchell says mark to mark but I have no mark on crank gear. When I set crank at TDC I am off 1 tooth on crank comparing it to keyway. When I set the crank gear with keyway I am off about 6 to 7 degrees. Does any body know...
1997 Chevrolet K1500 Cheyenne 5.7L Misfire VIN: 1GCEK19R1V
i have a problem child here, this truck has a missfire on cylinders 2 & 6 constantly, seems to be fireing out exhaust at least partially. heres where we started, scan for codes found codes as noted also noted no sync pid on scanner and mass flow flatlined, did... Trouble codes: P1345 (cam/crank correlation), P0340 (cam sensor problem), P0300 (missfire), P0131 (o2s signal low b1s1), P0102 (mass air flow circuit low), P0101 (mass air flow out of range)
1998 Chevrolet Venture 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDX03E7W
This van came in running ruff with po300 after checking codes we found some misfires on different cylinders but #1 was missing all the time I check for spark and it was ok lissen to injector it seam to be working.Ok here is what I have done. I resealed the int... Trouble codes: P0300
1999 Chevrolet Express 3500 LS 5.7L No Start VIN: 1GAHG39R8X
Vehicle towed in with a no-start no-spark only when cold complaint. Cold being below about 15 degrees farenheit. After slight warming the vehicle would start and run normally for several days. When the vehicle finally did start, there was no evidence of an eng... Trouble codes: P0336, P0339
2001 Chevrolet Silverado 1500 4.8L Starting VIN: 2GCEC19V51
Customer comes in and wants a new fuel pump installed. Fuel gauge doesn't work and sometime won't start. Had a po463 level sensor code. Replaced pump and filter. Customer calls month later, been working fine until then. No start. pull in shop check fuel psi. f...
2002 Chevrolet Astro 4.3L Misfire VIN: 1G3NSJW929
cylinder 1 and 2 misfire. vehicle started as a crank no start installed new plugs,wires,and cap. vehicle started and ran fine for two weeks(noticed tune-up intake leaking coolant)came back missing,all for intake gaskets removed intake found cl#4 intake port cl...
2003 Chevrolet Silverado 2500 HD 6.6L air bag/ sir VIN: 1GCHK241X3
hi i had this truck 1 month ago customer asked me to check airbag warning light on. found b0100 code-electronic front end sensor1 fault. came back and i put front impact sensors in and still has same code wont clear and air bag light stays on. also both impact...
2003 Chevrolet Trailblazer LTZ 4.2L ignition lock cylinder VIN: 1GNDS13S53
Does anyone know any tricks to getting the ignition lock cylinder out when the key wont turn?
2003 Chevrolet S10 2.2L Headlamps VIN: 1GCCS19H33
Vehicle has no high or low beam headlamps operating,nor is the DRL operating. The parking lights work OK. A code of B2600 Day time run lamp ctrl 1 ckt fault. Checked all fuses,lamp relay and DRL relay,all Ok. Replaced the interior lamp switch assy. and still n...
2004 Chevrolet Epica LS 2.5L High Beams VIN: KL1VB52L34
2004 Chevy Epica high beams arent working. The little blue light on the dash doesnt work, nor does the flash to pass option. I had a tip to check for broken wires under the LF fender cover and none were found. Any info would be greatly appreciated. Thanks.
1993 Geo Storm 2+2 1.6L No Start VIN: J81RF2366P
Morning all. This GEO is being a pain in my behind. Towed in died on road. No spark or injector pulse. Did not check fuel pressure. Checked wiring diagram & replaced ECM relay & car started right up. Road tested & pulled back into shop to get info. Car would n...
1999 GMC Sierra 1500 SL 4.8L Cluster VIN: 2GTEC19V0X
The Odometer and PRNDL display on this truck will come and go. I have removed the cluster and can recreat the problem by flexing the small circuit board that is solder onto the large (main cluster) circuit board. Does anyone know what goes wrong with this and ...
2001 GMC Jimmy SLE 4.3L Surge, Cuts out, Misfire, MIL Lamp on VIN: 1GKDT13W81
at 2500rpm cuts out tach flucuates up and down this happens in park or test drive on road. have also tried different distributor too. wirs ok at sensor and distributor ran ok customer said until trans was replaced. but cant find any pinched wires crank code ha... Trouble codes: P0335
2004 GMC Sierra 2500 HD SLE 6.6L Seal VIN: 1GTHK29234
Hello, Has anyone replaced front differential seal on left side at axle shaft? We are having problems getting the inner axle shaft out of differential. Alldata said to use a brass drift and knock it out. Tried this but no luck. We do not want to damage compone...
1992 Oldsmobile Achieva S 2.3L No Start VIN: 1G3NL5432N
hello i am working on a 92 olds achieva 2.3 quad 4 sohc that will not start, has everything(spark,fuel pressure,injector pulse, compression just over 200 psi.)no codes sounds as if crossed up wires. 3 things in scan data are not even close to being correct are...
2003 Oldsmobile Alero GL 2.2L Cooling Systems VIN: 1G3NL52F83
I have a 03 Alero and this car will not heat. There are no signs of Headgaskets and it is full of coolant and bled out. I can let this car idle all day long and it runs at 195 and it has good heat. As soon as I bring it off idle it loses heat and the temp stay...
2000 Pontiac Sunfire GT 2.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3G2JD12T3Y
This car has a poor idle problem. Codes p0300 (random misfire) and p0420 (cat efficiency) were in memory. both happened at idle, p0420 in park and p0300 in 2nd gear. both no vehicle speed - freeze frame does supply temp reading. When the tranny is in park it s... Trouble codes: P0420, P0300

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Skylark Custom 3.1L Cuts out VIN: 1GM4J52M2L
hi iatn techs,we all fix the problem.I want to say thanks to frank,troy,michael,dave,christopher,matt,mike,michael(from ohio)sal,kent,karry and clayton. michael(from oklahoma)said that the theft system would not affect the ligths so that open my mine a bit.I d...
1990 Cadillac DeVille 4.5L Surge VIN: 1G6CD5336L
Thanks to everyone that gave me suggestions. Overall everyone had good advice but the winner was Paul [...] - I inspected the distributor & drive gears, tried to do a relearn again, ohm the injectors and pressure drop, checked computer data, but finally I ... Trouble codes: F10.
2003 Cadillac DeVille 4.6L ebcm VIN: 1G6KD54Y03
Thank you to all who replied. I checked cotinuity on serial data line from EBCM to splice pack which also checked good. I then decided to change the crank sensors to cover stalling problem. After replacing the sensors the ABS/TRAC lights went out? Of course I...
2002 Checker 1500 Silvera 5.3L Misfire VIN: 2GCEK19T32
Thanks, David from Illinois who was the first reply and nailed the problem. I removed the o2 sensor and test drove and engine ran great. Replaced the convertor on bank 2 and customer is driving the vehicle and happy. I have replaced many plugged convertors but... Trouble codes: P0300.
1991 Chevrolet Astro 4.3L speedometer VIN: 1GCDM15Z5M
thanks or all the help. most all responses mentioned terminal issues as being the culprit. Ater i replaced the cluster, speedo started working. What i assumed happened is the drac module burnt the cluster, although i will never know or sure. I did check termi...
1993 Chevrolet Corsica LT 3.1L Excessive Emissions, BURNS OUT CAT IN 5 M VIN: 1G1LT53T2P
Thanks to all who have answer to my need again. Problem has been resolve. And thanks to the ones who mention coil and control module. The ign. module fail on high and low RPM when it got hot and thats what solve my problem. Again thank you all for the help
1996 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W6T
An incredible thirty eight replies on this one, thanks to everybody for your time. The general concensus was the fact that this vehicle needs at least 60-65 lbs to open the poppetts at the injectors. The new module made 62 lbs and the vehicle starts perfectl...
1997 Chevrolet Express 2500 5.0L rear brakes VIN: 1GCFG25M1V
thanks to all who replied. I removed the proportioning valve from the front of the ABS unit. Upon removal I noticed that there was no fluid flowing through the cavity which feeds the rear. I knew then that I had probably found the source of the problem. I call...
1999 Chevrolet Silverado 1500 5.3L pressure control VIN: 2GTEK19T8X
thanks robert from new york you get a cookie. after removing pan again i noticed the transmission pressure switch had started to separate, suspecting it was bypassing fluid i went with a new oe. that one had metal plates on it where the old one had plastic. th...
2002 Chevrolet Cavalier LS Sport 2.2L shift VIN: 1G1JH12F82
Checking this circuit was dificult. The connector is below the top radiator hose. I checked the powers and grounds with KOEO. I always had it. I found voltage dropping out KOER. After looking CRITICALLY, I noticed that there was a branch to the circuit to...
2003 Chevrolet Silverado 2500 6.0L Starting VIN: 1GCHC24U63
Thanks to the five of you who understood and gave us some great input. We forwarded all info to our neighbors. They opted to send it to the local dealer who replaced the ECM.
1998 GMC K1500 Sierra SL 5.7L brake pedal VIN: 2GTEK19R6W
OK, this one is fixed. I thought about all 15 replies overnight and still wasn't sure. Came in this morning and the bottom of the master cylinder was wet. Leaking between the master cylinder and resevior. I then called the customer, who know a little about...
1998 GMC K1500 Sierra SL 5.7L clear coat VIN: 2GTEK19R4W
Thanks to all who responded. The vehicle has not been damaged in these areas by collision of any kind. While it does have high miles and is 10 years old, the objective was to see what members had experienced. All of the information was relevant. We called o...
2006 Hummer H2 6.0L MIL Lamp on VIN: 5GRGN23UX6
Thank you for all your help. I removed the canister and checked for clogging or debris, and it was clear. While rechecking the system, I found that after purging the system, the pressure sensor voltage remained at 4.5 volts. I removed the gas cap and even disc... Trouble codes: P0446 (EVAP Vent Control Problem).
1999 Oldsmobile Alero GL 2.4L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3ML52T1X
we finally traced it down to a short between the quad driver in the pcm thanks for all the help. Trouble codes: P0200, P0300.
2001 Oldsmobile Alero GL 2.4L engine noise VIN: 1G3NL12T81
i got some good advice removed cover and inspected timing chain guides , worn out , customer dosnt have the funds at this time but might see back soon when has it ,
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