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Prev Professional Automotive Repair Technical Discussions for February 28, 2007
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Open Help Requests for GM
Help Request Answers
2002 Buick Rendezvous CX 3.4L Surge VIN: 3G5DA03E02
Hello Techs. The engine RPM only raises when the temperature is between the deg. of 224-230. The first speed fan is commanded on and stays on, the second speed toggles on and off at a very fast rate causing the RPM’s to surge between 1K and 2K. If the temp. go...
1973 Cadillac ELDORADO 500CID rear water drains VIN: 6L67S3Q420
Does anyone know where the water drains are on this Caddy? Remember it is a convertible not a hard top. I've looked all over the trunk and well for the top, as around the outside of the body. Thanks
1994 Cadillac DeVille 4.9L Poor Idle Quality VIN: 1G6KD52B3R
Hi there, Deville will idle very high when warm, drives down road as if the cruise was set, tested and replaced valve/stepper motor for idle stop(would not move), now vehicle idles fine, but intermitantly whilst cruising at light throttle, you can feel the gas...
1999 Cadillac DeVille 4.6L ride hieght VIN: 1G6KD54Y4X
Hello everybody. I have a customer that came in with his whole left side sagging 1 1/2 inches lower then the right side. The air pump seems to working normally, and the car has four new shocks in it.
1993 Chevrolet Lumina Euro 3.1L bad computer info VIN: 2G1WN54TXP
Car came in running on four cylinders. Cylinders 1 and 4 dead. replaced coil pack did not fix so we replaced ignition module now runs on all six. But now car is hard to start. Acts like timing is way out. After start up idles and runs fine but rev limiter kick...
1994 Chevrolet Corsica 3.1L Stall VIN: 1G1LD55MXR
Thanks in advance for any help you can give. Customers original complaint was the vehicle dies when shifting into drive, although the symptoms are intermittent.Check the basics,scanned for codes none,fuel press.ok,data stream info normal, iac count fairly high...
1995 Chevrolet Blazer 4.3L Poor Idle Quality, Cuts out, Stall, Poor Fuel Economy VIN: 1GNDT13W1S
This blazer came in for a no start problem, found 40 psi fuel pressure, so I replaced the fuel pump, sender, and filter. Everything was fine, came back because it wouldn't run, raise the idle and it bucks, idle surges. If you externally enrichen it (use intake...
1998 Chevrolet Prizm 1.8L No Start, Stall VIN: 1Y1SK528XW
(Scream here) Driving me nuts. It will start for about 2 seconds with a bright injector pulse but then it fades out. Has an ignition module "fail-safe" mode code don't know # (at home). Searched archives to no avail except for one post with similar symptoms th...
1998 Chevrolet Lumina 3.1L Hesitation, Surge, Cuts out VIN: 2G1WL52M5W
This problem is very intermitent. I have to drive the car 5 to 6 times befor it will happen. It only happens when I accelerate hard to wide open. While it does act up it feels just like I am taking my foot off the gas. The rpms drops from around 3500 to 1500. ...
2000 Chevrolet Blazer LS 4.3L transfer case VIN: 1GNDT13W5Y
i have a 2000 blazer that the 4wd low light is on and it will not switch to 4wd high or 2wd. there are no codes when scanned. the service 4wd light is not on. the front differential can be disengaged by disconnecting vacuum from the actuator. is this a syptom ...
2007 Chevrolet Colorado 2.9L radio VIN: 1GCC0158H4
I got a 2007 chevy colorado ls with a single cd player with theftlock, I need to remove the radio without interfering with the theft lock does anyone know how to remove this radio?
2001 GMC Cab & Chassis Sierra 3500 8.1L ebcm VIN: 3GDKC34G81
Hello everyone, Vehicle came in with ABS light on. I thought it would be a straight forward ABS diagnosis but I was wrong. I connected my SnapOn scanner and found out I could not communicate with the EBCM. No data or codes, nothing. When I turn the ignition on...
1995 Pontiac Grand Am SE 2.3L engine temp. VIN: 1G2NE15D5S
Had car come in last week for a tune-up, replaced plugs, plug boots, coil housing and coils. Checked compression at that time and was o.k. Noticed waterpump was leaking, so recomended. Came back, we put a waterpump, stat, reservoir cap and hoses on it. I also ...
1996 Pontiac Grand Prix GTP 3.4L Delayed reverse and sometimes first gear VIN: 1G2WJ12X1T
Hello to all. we have 2 1996 grand prix with tranny problems both of course have 4t60e trans. One car a trans rebuild was done and after has a delayed reverse or first gear engagement. and sometimes if you are driving first thing in the morning taking off from...
2005 Pontiac Montana SV6 3.5L abs & awd VIN: 1GMDX33L65
Vehicle arrived with AWD not functioning and ABS light illuminated. Retrieved codes. Codes present: c0045 (left rear wheel speed circuit) c0050 (right rear wheel speed circuit), c0281. Checked connections. I'm having difficulty thinking both rear speed senso...
1995 Saturn SL2 1.9L No Start, Poor Idle Quality VIN: 1G8ZJ5275S
I am trying to diag a hard start/Poor Idle concern. While trying to monitor the Data from the snap on modis for ECT, the ECT reading is not a value but letters in the read out. Is this an indication of a fault or is there a decode for these letters? This thing... Trouble codes: 15 (ECT reading High or open)
2002 Saturn Vue 3.0L cooling fan VIN: 5GZCZ63B02
The cooling fan on this vehicle will not turn off after it has been turned on by ECM. It appears that the ECM is not turning off the relay. The engine heats up normally, fan turns on at 102c, When the engine temp drops the fan does not turn off, temp drops to ...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Skylark Custom 3.1L MIL Lamp on VIN: 1G4NJ52M4V
had alot of replies and still light coming on - we replace all new delco o2 sensors - ran all new wiring and grounds and replaced pcm - still after two days light came back on - sent car to dealer and last i heard from customer dealer had for 1 week and still ... Trouble codes: P0135 (bank 1 sensor 1 heater circuit).
1998 Buick Regal LS 3.8L battery VIN: 2G4WB52K2W
Well, I think this thing is fixed. I believe that replacing the instrument cluster did the trick. Once replaced the PRND light and the odometer came back online. The car has been here since the post due to customer has broken leg. The draw has not returned. On...
1998 Chevrolet Blazer 4.3L Park rev neturl drive indicator VIN: 1GNDT13W9W
The problem turned out to be the 4 pin connector at the transmission position switch. Dave and Justin were correct in looking at that area first. This vehicle had this problem for some time but had to be repaired because of state inspection failure. As most of...
1999 Chevrolet K1500 Suburban 5.7L radio VIN: 3GNEK16R7X
sorry i dont have a great answer but after looking in several places under steering colum and under the center console, my conclusion is that this 99 old body style suburban does not have the rap feature. ever since finding the door jamb wiring bad at the rear...
1999 Chevrolet Cavalier 2.2L abs light,others VIN: 1G1JC1242X
Thanks for all that responded, we have finally fixed this one. The reason it took so long is I had to wait for the original instrument cluster to return for reinstallation as it wasn't the problem.I had found another similar case in the knowledge base that had...
2000 Chevrolet Silverado 1500 4.3L neutral switch VIN: 1GCEC14W5Y
Thanks for all the replies. after checking all the wiring and found it was wired correct we replaced the new switch with another new switch and it fixed it. Thanks for all the help including GM for the wiring diagrams.
2001 Chevrolet Silverado 1500 4.8L abs action VIN: 2GCEC19V01
Thanks for all the replies, fixed by cleaning sensor seating surface and shaving slightly, just enough to cure 2 vehicles with same problem. Techs replies included this fix, others that often hub had to be replaced, play in hub not noticed with vehicle in the ...
2003 Chevrolet Suburban 1500 LS 5.3L instrument cluster
Customer has not returned to have vehicle repaired. Most replies stated new or rebuilt cluster would take care of this problem. Thanks to all for your help!!!
2005 Chevrolet Express 3500 6.0L camber bolts VIN: 1GCHG39U65
Thanks to the six people who replied. However, I found a different way to align this van. Remove the plastic locking tab and you will see indentations in the ajusting cam. Place a small chiesel on the indents and tap it with a hammer. It works great.
1997 Geo Metro LSi 1.3L No Start VIN: 2C1MR5299V
this problem car became an AH HA moment during the night , going back thru the wiring system I found a resistor block bolted to the left rear firewall behind the strut tower , apparently it lowers the voltage at the injector and then it takes very little curre...
1997 GMC K2500 Sierra SL 6.5L Poor Idle Quality, NO POWER VIN: 1GTGK24F2V
Pulled timing cover off and found cam/pump sproket to have sheared keyway off, not very far off but far enough.Crank and cam where in time, cam to pump in time but the two cam sprokets were NOT.Thankx for all the help. Trouble codes: P216.
1998 GMC Jimmy Envoy 4.3L battery drain VIN: 1G87T13W3W
replaced the radio on this envoy with a used one. The costomer has not come back and i conceder this as a fix and thanks to all who helped.
2001 GMC Savana 2500 5.0L MIL Lamp on VIN: 1GTFG25M51
This vehicle had an aftermarket radio installed. The ALDL shares a circuit with the radio. The installer did not use this wire and left it bare which shorted to the dash brackets. After fixing that we were able to scan the vehicle and found two fouled plugs. T...
2002 GMC Envoy XL SLE 4.2L transfer case VIN: 1GKET16S92
We came to find out that this transfer case has a clutch in it. Module can apply clutch pressure according to the needs of the car. Since there are no fail codes, we didn't have any diagnostic path to follow. Sent to the dealer since they can swap parts on or ...
2002 GMC Envoy SLE 4.2L engine VIN: 1GKDT13S32
it was the valve lash adjusters.then they traded it in for a toyata 4runner
2003 GMC Sierra 1500 SLE 4.3L starting, prndl VIN: 2GTEC19X73
Thank you to all who replied. Most of you suggested to replace the neutral safety switch as they appear to be a problem area on these vehicles. We did just that as well as the 4-pin connector (which showed signs of corrosion) and the problem was rectified. We ...
1997 Oldsmobile Aurora 4.0L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G3GR62CXV
thanks to those who replied to this post information was very helpful however after loosing my shirt customer decided to go back to dealer electrical problems all over vehicle possible flood car thanks again to those who helped Trouble codes: P1599 (cc power management or engine stall), P0507.
1999 Oldsmobile Aurora 4.0L engine VIN: 1G3GR62C3X
I have learned though the help of all the folks that replied,that the 4.0 northstar,like the 4.6 northstar,has headbolts that are simply threaded in to the alumium block. A time bomb ready to go off. Since many that have replied have obvoiusly' been there done...
2001 Oldsmobile Bravada 4.3L Excessive Emissions VIN: 1GHDT13W31
thanks for all your replies, it was found to be the canister vent solenoid mounted above the spare tire was restricted. this system does not have a tank vent tube that runs with the filler neck. the vent solenoid vents to atmosphere whenever the key is off all... Trouble codes: P0446 (EVAP Vent Control Problem - Cant Sense Any Pressure.), P0462 (Fuel Level Sensor Curcuit Signal Low), P0463 (Fuel Level Sensor Curcuit Signal High).
1989 Pontiac Firebird 2.8L Hesitation, Misfire VIN: 1G2FS21S8K
Thank you everybody for your replies. Took awhile to get this customer back into the shop. Anyways, it turned out to be the MAF sensor. After seeing the post that mentioned the MAF sensor I remembered that when I looked at the vehicle the first time it had a M...
1999 Pontiac Grand Prix GTP 3.8L Poor Fuel Economy VIN: 1G2WR5210X
well fellow technicians i would like to thank each and everyone of you who replied to my post but unfortunately i still am unable to find the specific problem that i have. i did try just about everything that everyone suggested. i replaced plugs, wires, cleane...
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