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Prev Professional Automotive Repair Technical Discussions for January 29, 2009
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1995 Cadillac DeVille 4.9L No Start VIN: 1G6KD52B7S
Hey folks, got this one w/no spark. Cust parked car, went to start next day no go. Tow in, we replace module in dist. Ck'd all fuses, found this has a used computer in it. Any help w/tests on this one. Also had code [...] ecm fault. Thanks for the time..... Trouble codes: 83 (no crank a or b), 81 (cam to ref fault), 78 (to many 24x pulse), 104 (internal ecm prob/stack overrun), 113 (quad driver 1 open/short), 112 (eeprom failure)
2005 Cadillac SRX 4.6L steering VIN: 1GYEE63A25
Hi all thanks in advance for any help received. I have a cadilac srx it has no steering assist sitting still you can barely turn steering wheel driveing down the road seems to be fine. I had customer take to cadilac and they said the pump and pressure hose wer...
1996 Chevrolet Tahoe LS 5.7L relay VIN: 1GNEK13R1T
Help! I am looking for the radio amplifier relay. Mitchell shows it located under lh side of dash rh side of brake pedal bracket, but it is not there.GM told me it was under the drivers seat by the amplifier. I found the amp but no relay. Does anyone have any ...
1998 Chevrolet Cavalier 2.2L Cooling Systems VIN: 1G1JC524XW
cust came in requesting head gasket for external leak.Replaced headgasket,car came back 2 days later with no heat/Coolant found on top of bottle.replace thermostat and degas bottle/cap. Shipped Car,car came back 2 days later no heat,found bottom of radiator to...
1999 Chevrolet Blazer 4.3L no start when cold VIN: 1GNDTW0X21
this truck has us baffled. if it sits outside when the temps go below about 15, it becomes very difficult to start or its a no start. during cranking when it wont start fuel pressure holds about 62-63 psi. runs perfect when it does start. no codes. scoped fuel...
1999 Chevrolet K1500 LS 5.7L lock-up convertor VIN: 1GCEK19R9X
just repaired radiator and test drove to find that the truck now has a tcc shudder. the customer never stated taht this problem was there before. i do belive him, he is a very good customer. the tcc will engage then will start to slip around 100 rpms then feel...
2002 Chevrolet Tahoe LS 5.3L Poor Idle Quality, Stall VIN: 1GNEC13Z82
I have a Tahoe that idles low (250-400) at times mostly when it is cold. I picked up the vehicle this morning and it would not hardly run and kept dying on me if I kept the idle up it would stay running. When I got it to the shop it ran fine and has not acted ...
2006 Chevrolet Trailblazer LT 4.2L wipers VIN: 1GNDS13S86
I would like to ask for help in diagnosing this vehicle. The wipers stay on low speed all the time. We have Shop Key and have folowed the chart to the step where the steering column harness connector "e" is disconnected and the wipers stay on. The next steps a...
1999 GMC Yukon Denali SLE 5.7L No Start, Stall VIN: 1GKEK13R7X
vehicle starts and stalls, pulled code P1626 anti-theft, fuses are good, accessed passlock module, i have battery power at orange wire ign. at pink wire, black and white is ground, nothing coming out at red and white wire going to passlock sensor,(should be 12... Trouble codes: P1626 (anti-theft fuel enable system)
2006 GMC C5500 Topkick C5C042 6.6L MIL Lamp on VIN: 1GDE5C1286
Original problem was no commucation with scan tool. We found broken wire to datalink connector, we then established communcation. Code p0106 map sensor performance was found, the engine is in reduced power mode. Wires check ok to map sensor then replaced it. E... Trouble codes: P0106
1996 Oldsmobile Bravada 4.3L Surge, Misfire, MIL Lamp on VIN: 1GHDT13W5V
Intermittently shows missfire at highway speed.freeze frame also show misfire occurs at or above 60mph.also had torque converter slipage fault set at one time.fuel pressure ok.does not miss at dile or if power brake it.any idea guyz Trouble codes: P0300, P0304, P0303

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick Park Avenue 3.8L MIL Lamp on
Thanks everyone for your help! As most explained, I replaced the pwm, TCC, and both shift solenoids as well as installing the updated wiring harness within the transmission. After clearing codes, test drove for 32 miles over two days and verified no return cod... Trouble codes: 26 (Quad Driver Module).
1995 Buick Century Special 3.1L very low power VIN: 1G4AG55M7S
Hello to everyone. First thing I did Wednesday morning was perform a compression test. All six cylinders were balanced at or near 110 on the first crank. This made me feel better, because now I knew I wasn't dealing with a couple of swapped pushrods, especiall...
1993 Cadillac Fleetwood 5.7L No Start VIN: 1G6DW5277P
i would like to thank everyone that helped out! I rechecked everything and found the harness from the ign module to the coil to go open circuit when I wiggled it. I replaced the wiring harness and it is now fixed. WHO_Ray! Thanks again, Chris
1987 Chevrolet R10 Suburban Custom Deluxe 5.7L No Start VIN: 1GNER16K4H
This is just an update. The customer had to pick up the vehicle to do some work around his house, then he is going work on the oil rig for a few weeks. So it will be a while before I get it back. The majority of the replies stated the dk. green-white wire is a...
1995 Chevrolet Corsica 3.1L No Start, Misfire VIN: 1G1LD55M5S
Thank you so much for all the replies. The problem turned out to be a defective cam sensor. Replaced with better quality sensor and the car is good as new. Thanks again for the great replies. This truly is a great service.
2000 Chevrolet Blazer LS 4.3L hard cold start VIN: 1GNDT13W3Y
Thanks to all who replied to my help request. I did all the checks that you recommended. The fuel pressure held at 60 psi overnight. There was good spark but still no start. After talking to the customer again and really asking a lot of questions, I found out ...
2001 Chevrolet Venture LS 3.4L front brakes VIN: 1GNDX03E61
Thanks guys for the quick response special thanks to steve [...] hit it dead on my stupidity left side inside brake pad was not in the groove was binding actually bent pad never had that happen before steve was on down the list so i still want to thank the ...
2003 Chevrolet Trailblazer North Face 4.2L Cuts out VIN: 1GNDT13S43
Sorry for the delay but I broke my collarbone and have been laid up for a while. fell off a mule. as suggested the ignition switch was faulty. thatnks for all for such a wealth of information
2003 Chevrolet Silverado 2500 HD 6.6L air bag/ sir VIN: 1GCHK241X3
hi i think i found the problem. i was told to check the wiring between the sdm and front impact sensor1 mainly between the connector at left kick panel and the sdm module under the drivers seat. i found one of the wires has 8k ohms and goes up steadily (gray) ...
2004 Chevrolet Epica LS 2.5L High Beams VIN: KL1VB52L34
Thanks for your reply. I did in fact find a broken wire in the harness under the LF fender inner cover. When I looked yesturday, I was looking for obvious signs of corrosion, and today I physically pulled on each of the around 60 wires, and the 3rd to last one...
2004 Chevrolet Colorado 2.8L Charging VIN: 1GCCS14184
Morning eveyone, well this one is down the road. It ended up being the alternator. Im not sure whats was wrong with it but the replacment solved the problem. I had the unit tested by a local rebuilder (very respected)but no problems could be found. I scoped th...
2005 Chevrolet Cobalt 2.2L Airbag Control Module VIN: 1G1AK52F35
I eventually used a Tech 2, but I will still try the Genisys tool the next chance I get so I know whether it will work or not. Thanks to all!
2005 Chevrolet Cobalt 2.2L electronic steering VIN: 1G1AK52F95
Well we think we fixed this car by accident. Went thru all avalible info on iatn then posted for info, in the mean time checked all powers and grounds. scoped data lines checked connections at ps module, fuse box and relays, and even though the problem was ver...
1999 GMC Jimmy SL 4.3L evap drain hose VIN: 1GKDT13W1X
Well after three techs searching we never did find a drain, we refered the customer to the dealer (before seeing posts a day later that there is only a hole on the bottom of the evap case, so we did not get to confirm this).
2002 GMC Envoy SLE 4.2L low beams VIN: 1GKDS13S32
once i got the headlights to shut down, checked my signal from sw. to bcm, good , bcm to HDM (thank you phillip and william), nothing, unplug hdm, now i have a signal, swap with fan relay (not FDM???) now i got headlights replaced with a new one ,( advise...
2004 GMC Sierra 2500 HD SLE 6.6L Seal VIN: 1GTHK29234
Used a pry bar and took a large brass drift and got more aggressive. Finally, it popped lose. Thanks everyone for your help!
1996 Oldsmobile 88 Royale 3.8L Poor Idle Quality VIN: 1G3AH52K4T
HI out there in car world I have my Oldsmobile fixed after I did as most of you suggested I rechecked powers and grounds I homed and did volt drop test again and all checked ok I finely ended up putting a few volt meters on the car at one time on the signal w...
2002 Pontiac Bonneville SE 3.8L Lighting VIN: 9045678908
Yes gentlemen, you were very correct, it turned out to be the flasher portion of the switch. Have new installed. Thanks again all.
2003 Saturn L200 2.2L No Start VIN: 1G8JU54F43
Thanks for all the help that the members have offered. It was indeed a bad fuel pump afterall. Replaced the pump & filter, all ok now. No check eng. errors or other problems. Thanks again, Bob
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