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Prev Professional Automotive Repair Technical Discussions for March 27, 2006
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Open Help Requests for GM
Help Request Answers
1989 Cadillac DeVille 4.5L Poor Idle Quality, Hesitation, Surge, Stall, Misfire VIN: 1G6CD5156K
this vehicle came from another shop, right from the start i notice a lot of new parts. customer stated the after having a tune-up done vehicle started to run strange the shop that worked on it could not find the problem they replaced all kinds of parts, now is...
1995 Cadillac Eldorado ETC 4.6L Poor Idle Quality VIN: 1G6ET1292S
THANK YOU ALL IN ADVANCE! we have this eldorado etc in our shop for a lube oil and filter, customer leaves it over the weekend. when picked up he comes back 5 minutes later and stated that it is running at high idle 1200+-. visual under hood, look secure, turn... Trouble codes: 80 (idle relearn), 55 (throttle position)
1998 Cadillac DeVille 4.6L Stall VIN: 1G6KD54Y1W
1999 Cadillac Escalade 5.7L Radio VIN: 1GYEK13R5X
When you turn the key to run position the radio comes on and displayes LOC which I know is normal when the power supply has been interupted (when Pep Boys replaced the battery). I have the code for the radion and according to my Mitchell you have to press the ...
2001 Cadillac Eldorado ESC 4.6L speedometer, dash VIN: 1G6EL12Y31
hello caddy techs, heres a good one for you all. this caddy came in for a loose e-brake bracket under the vehicle. we put in some tech screws to fasten it. After we did this we lost alot of stuff, speedometer, tachometer, coolant gauge, electric windows, power...
2002 Cadillac Seville SLS 4.6L battery lamp on VIN: 1G6KS54Y32
car brought in with battery lamp on, codes p0621 and p0563 stored and reset when cleared, charging voltage is 14.5 volts at battery and ignition one terminals. tech 2 shows l terminal always off.i thought it was short in alt, another tech thinks pcm, any help?...
1968 Chevrolet camaro 327CID ring and pinion
Good afternoon older chevrolet techs.I am an import tech so I don't get to see these old buggies very often.A friend of mine purchased this old car and had me redo the engine in it ,now he wants me to replace the gears in the differential.I have never replaced...
1978 Chevrolet Camaro 5.7L Cylinder heads
Student has bought a set of aftermarket aluminum cylinder heads for his engine. Renegade brand, angle plug small block chevy, purchased from Motorville, a performance parts supplier. The heads are manufactured overseas and they have no web site, and I called M...
1985 Chevrolet Corvette 5.7L No Start VIN: 1G1770789F
vehicle towed back in.still has good fuel pressure.good spark.injector signal will barely light noid light.with injector disconnected.test power and ground.found both wires having power.disconnect ecm and both wires still have battery voltage.tested on more th...
1987 Chevrolet Corvette 5.7L Cooling Systems VIN: 1G1YY2185H
This Corvette originally came in for an overheating condition. Main fan was not working, fusible link burnt. Replaced fan motor,relay and repaired fusible link wiring. Auxillary fan circuit working when tested by grounding wire at fan switch located at left cy...
1990 Chevrolet Camaro Iroc-Z 5.0L MIL Lamp on VIN: 1G1FP33F6L
original problem on vehicle was a code 43 esc with scanner hooked up i checked for knock sensor signal ecm picks up signal but no response from ecm (no timing change) found tsb for updated knock sensor and prom now ecm will not communicate with scanner after i...
1993 Chevrolet Lumina 3.1L transaxle VIN: G1WN14T599
Good morning, this is a car that I was trying to get ready for my son to drive. We did a tranny swap with another vehicle he had been driving a 94 Pontiac Grand Am. As far as I know the tranny that we installed had been working O.K. We install the one from the...
1996 Chevrolet S10 2.2L engine VIN: 1CEC3234SW
Hi Guys, I would like to get a little input on a 1996 chevy s10 with 2.2. This vehicle came in with bad engine, had a bad head and was real noisy. And many miles. Customer requested a good engine from a salvage yard. I picked one up from a reputable salvage ya...
1997 Chevrolet Cavalier 2.2L Misfire VIN: 1G1JC1242V
Miss on # 2 cylinder only.Will happen after snap throttle. Static compression even on all four cylinders. Running compression test shows cyl #2 down 50 psi. leak down less than 5%.No ignition failure. Fuel injector replaced with known good. All fuel injector s...
1998 Chevrolet K1500 Cheyenne 5.0L Misfire, MIL Lamp on, cylinder 5 VIN: 1GCEK19MOW
Help! We have a dead mis on this vehicle. Seems I always get these. This one has got me baffled. first we did a compression test to all cylinders all near 150psi, also did cylinder leak down in number 5 ok. So figured on a bad injector, replaced injector same ... Trouble codes: 305 (cylinder number 5 misfire)
1999 Chevrolet Malibu 2.4L Misfire, MIL Lamp on VIN: 1G1ND52T6X
This car has a misfire on #1 cyl. I replaced plug boots & coil housing but skip remained. Tested fuel injectors and found that #1 injector was not pulsing under load but works good at other times. Scan data is good when inj pulse stops. I suspect ecm. Has anyo... Trouble codes: P0300
1999 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GCCS19X0X
This S10 Pickup is part of a fleet owned by a local company. They brought truck in for a engine noise which turned out to be a rod knock and a oil pan full of metal. They elected to have a reman. unit installed which we did. Upon road testing the vehicle the s... Trouble codes: P0171, P0174
2000 Chevrolet Malibu 3.1L MIL Lamp on, VIN: 1G1ND52J6Y
customer returns once a week with this code in memory. the service engine soon light on is her only complaint. only previous repair work preformed was intake manifold gaskets. it takes almost a week to re occur Trouble codes: P1189 (oil pressure switch circuit)
2002 Chevrolet Avalanche 1500 5.3L Drive train VIN: 3GNEK13T02
Hello , I have a Avalanche with some vibration problems. In auto 4x4 or locked in 4x4 this truck will vibrate. You have to be going at 80 - 100 kms with a little ecceleration. once it starts you can keep it going. It feels like the front end is hopping. The on...
2005 Chevrolet Colorado Z85 LS 3.5L MIL Lamp on VIN: 1GCCS13685
i have this colorado that keeps comung up with a po 300. the thing is, it does not miss firing. the dealership has performed a service bulliten to correct the problem, but the code comes back. so now they are telling the customer to r&r the valves with larger ... Trouble codes: P00, 300 (multi-misfire)
1998 GMC Jimmy SL 4.3L Broken wire VIN: 1GKDT13WK5
Hi GM PRO's, I have been long time in this trade and I have NEVER seen something like that!!!... - [...], Nov. 2004, part # "127-[...] Auto-Xtra" left front hub assemby was installed on this vehicle... - [...], Jan. 2005, warranty replacemant due t...
2001 GMC Jimmy SLE 4.3L MIL Lamp on VIN: 1GKDT13W21
This vehicle was brought to me by a friend who has had it to the dealer at least 10 times on more for the code that keeps coming up. He has a file on this vehicle the size of a book. The dealer replaced the maf sensor, the air pump and the air pump sylenoid. C... Trouble codes: P0410
1989 Pontiac Grand Prix 3.1L abs module VIN: 1G2WP11T7K
Well i have a no communication problem. I have performed the "diaognostics cannot be entered flow chart" and all pinout values are correct as far as the chart is concerned. We are using a BDM scanner with all updates. It reads the ECM fine but does not read AB...
1994 Pontiac Grand Am SE 3.1L No Start VIN: 1G2NE55M2R
Car towed in for no start. Found no spark to plugs. Module and coils checked out so I replaced crank sensor and car started right up and ran fine. I gave car to customer but they called me back very next day no start again. Again no spark, I heated coils, modu...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac DeVille d'Elegance 4.6L Starting VIN: 1G6KE54Y6V
Almost all of your help info was tried prior to my help request. I really appreciate all that responded. Unfortunately the vehicle owner was very short on patience and decided to take the vehicle as is which is particularily frustrating to me, let alone my Tec...
1993 Chevrolet C1500 Cheyenne 4.3L Cuts out, Stall VIN: 1GCEG14Z4R
Sorry it took so long to close the help request! the trruck is fixed, it turned out to be a worn distributor assembly. many of you said that this would be the case and it was. Thanks again to all who replied.
1999 Chevrolet Tahoe LS 5.7L lack of acceleration VIN: 1GNEC13R9X
wow thanks to the many replies 31 to be exact...well not sure what happened to this one but most of the replies were for the fuel pump..a couple on the mass air flow, injector poppets. what did was to unplug the mass air flow and drive it, and it was the same.... Trouble codes: P0420, P0430.
2000 Chevrolet Silverado 1500 5.3L Thermostat? VIN: 2GCEK19T6X
Sorry, truck has not been back yet. Here are some replies 1- If in fact the radiator is not factory and is a replacement it may be missing the restriction for the surge tank.visually inspect the upper right hand side nipple that feeds the radiator surge tank f...
2001 Chevrolet Silverado 1500 4.3L No Start VIN: 1GCEC14W61
I pulled the tank down only to find the gray wire just starting to get hot and burn at the connector, replaced fuel pump module and repaired connector. thanks for all your help. This truck also had a delco pump in stalled a few months before.
2001 Chevrolet Monte Carlo SS 3.8L ABS and Traction control VIN: 2G1WX15K01
First off thank you to Frederick, Bruce, Ciro and Gary for your input on this. Information included uneven tire wear, loose wheel bearing assemblies, rust in the trigger wheels, bad wiring to sensors and faulty sensors. Bruce gave me a good procedure to check ...
2004 GMC Envoy XL SLT 4.2L pedal VIN: 1GKET16S54
I want to thank the Three that replied, the best thought that I hadn't pursued was the wheel bearing moving on sharp turns forcing the brake pads apart, then giving the soft pedal momentarily. I definately tried to get it to do that after the reply, to no avai...
2004 GMC Envoy XL SLE 5.3L engine VIN: 1GKET16P54
Thanks to all who responded. I did do a leak down test on that cylinder and found air escaping through the oil fill cap. The customer is trying to decide if he wants to fix it or trade it off. If he lets me fix it, I'll let everyone know exactly what I found. ...
1996 Oldsmobile LSS 3.8L Stall VIN: 1G3HY52LR4
Thanks for all the excellent replies. I cleaned and tightened every connection from the cam sensor, module, and PCM. I returned the car to the customer with instructions to contact me with any problems. So far so good. I plan to contact him if I don't hear fro... Trouble codes: B1021 (TFE Malfuntion).
1999 Pontiac Montana 3.4L airbag VIN: 1GMDXO3E6X
thanks for the responses now i didnt have to wait for the computer tech to show up the van is fixed replaced the pretenor connection was good. now i dont have to look at anymore. thanks again
2001 Pontiac Aztek 3.4L body control module VIN: 3G7DA03E41
Thanks to all who read and replied! An extra mention to Tracy [...], thanks for the extra help! The answer is B, the Pontiac Aztek is a B body code for purposes of entering body mode on a Tech 2. There seems to be no positive method to determine GM's body co...
1996 Saturn SL2 1.9L Door Locks VIN: 1G8ZK5270T
thanks for the help with this, seems to be an electrical prob. in dash, checked the bulk connector it looked good. when we get the car back in i will get back to you all again. thanks again for the input. rusty
2003 Saturn Vue 2.2L mil VIN: 5GZCZ43D93
I had the Saturn Vue with the Mil Light and No codes. I reset the light and told the woman to drive it then come back when the light came back on. Thank you for your replies. I wish I could give you answer now but the woman has not returned so either the MIL i...
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