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Prev Professional Automotive Repair Technical Discussions for March 15, 2007
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Open Help Requests for GM
Help Request Answers
1996 Cadillac DeVille 4.6L No Start VIN: 1G6KD52Y6T
Hello Everyone, I need help..We installed a water pump 50 miles ago and customer had car towed back in complaining of oil leak and no start.The oil leak looks like it was coming from the rear of the oil pan gasket, Pumping like a artery that just was cut. Thou...
1991 Chevrolet R1500 Suburban Silverado 5.7L speedometer VIN: 1GNER16K8M
The speedo shows 0 mph at all speeds. When the speed sensor voltage is measured at the DRAC, it increases as vehicle speed increases. Mitchell says that there should be AC voltage at the speedo output. I measured 0v. I replaced the DRAC with a new one. I still...
1993 Chevrolet K1500 Cheyenne 5.7L brakes VIN: 1GCEK14K4P
Good morning all I have this truck here thats driving me nuts.truck came in with no brake pedel master cylinder empty and left rear wheel cyinder blown out (shoes soaked with fluid).Replaced both wheel cyinders rear shoes and attempted to bleed out brakes unab...
1997 Chevrolet C3500 Cheyenne 7.4L No Start VIN: 1GCHC39J8V
Good Day, This truck towed in from other shop that just installed new motor. They claim the motor fired up the first time that they tried then nothing. We scanned truck with Tech 2 and no power train codes, no body or chassis codes. When I checked class 2 data...
1998 Chevrolet K1500 Cheyenne 5.0L Unknown VIN: 1GCEK19MXW
Replaced motor 500 miles ago everything went great. Now i am getting a humm noise at first start up from engine compartment that was not there before engine swap. Noise only lasts 3-5 min. Almost sounds like it could be caused buy some sort of vac problem. Thi...
1998 Chevrolet K2500 Cheyenne 6.5L No Start VIN: 1GCGK29F9W
Hello all, Please excuse me, I am a diesel novice. This is the first time I have ever tried to do diesel driveability. I specialize in gas engine driveability but also do general repairs. A good customer of mine is a used car lot that bought this truck at a...
1999 Chevrolet Tracker 2.0L Radiator VIN: 2CNBJ13C9X
This vehicle comes to us with intermittent over pressure in the cooling system. It has expanded three radiators but does not over heat until the coolant leaks from the radiator due to the expansion. We have performed a carbon test many times that all show nega...
2001 Chevrolet Silverado 3500 6.6L shift VIN: 1GBJK34161
Thanks in advance for any help on this one... I have an Allison equipped K3500 4WD dump truck that won't upshift on its own after it is hot. I can make it upshift with the Tech2. I have been monitoring the ign 1 and ign 0 fuses for power loss per tech bulletin...
2003 Chevrolet WORKHORSE 6.5L No Start VIN: 5B4HP42Y43
truck was towed in no start rental company they had put in injector pump still no start i put in new lift pump because no fuel was getting to injector pump gotb fuel to pump still no start no rpm reading on scanner during crank i cant get any fuel through the ...
1989 Geo Spectrum 1.5L Cuts out VIN: J81RF217XK
This is our first post so bear with us please. We have this spectrum that bucks and carries on while accelerating. When the vehicle is sitting at idle it runs fine, also, if the clutch is depressed while the problem is occuring it will straighten out until clu...
1999 Oldsmobile Bravada 4.3L Suspension VIN: 1GHDT13W0X
this vehicle seems to have a tire rub noise when truning fully right or left it also feels like the brakes are engageing almost stoping the vehicle.when you straighten out the wheel it is fine we checked for any rubbing on chassis,checked alignment and replace...
2000 Oldsmobile Silhouette GLS 3.4L No Start VIN: 1GHDX03E8Y
Perform test on class 2 data line - unplugged modules on data line to see if one was shorting. Cannot communicate with theft detterant system. Retrieve code from PCM - U1000 and P1626 - run test for P1626 - replace PCM - no difference - check ohms and voltage ... Trouble codes: P1626, U1000
2000 Oldsmobile Bravada 4.3L MIL Lamp on VIN: 1GHDT13W0Y
Customer just bought this 2000 Bravada. SES light is on with codes P0446, PO452 and PO453 I am not real familiar with these codes other than I know the 446 code can be just a loose gas cap. The other two are refering to low voltage and high voltage at the fuel... Trouble codes: P0446, P0452, P0453
1993 Pontiac Grand Am SE 3.3L Poor Idle Quality, Surge, Stall, Poor Fuel Economy VIN: 1G2NE14N5P
This one came in surging so badly it would die at stops. Found bad MAF and IAC, replaced both and cleaned the IAC passages. Same problem after parts replaced, still no codes and it does run better but still surges. Unplugged TPS to check if it was possible an ...
1995 Pontiac Grand Am SE 3.1L No Start, Stall VIN: 1G2NE55M5S
Hello everyone, have a hair puller for ya! Vehicle starts and dies similar to a anti-theft system problem, but this 1995 grand am is OBD-1 and is not equiped with anti-theft. This is odd, i am losing fuel injector pulse, but if i apply an alternative fuel sour... Trouble codes: 82 (3x Signal Error)
1999 Pontiac Grand Am SE 3.4L Stall, MIL Lamp on VIN: 1G2NE52E3X
vehicle was in for CEL and running rough at 110,000 miles. needed tune up and had leaking fuel press reg. performed maintenance tune up and replaced press reg, cleared codes and fuel trim was normal. vehicle is back with 117,000 miles and has a P0172 sys rich ... Trouble codes: P0172
1994 Saturn SC2 1.9L sunroof VIN: 1G8ZH1579R
Attention Saturn Techs; Are they individual parts available for the sunroof module for this year? I have not remove or inspected it closely yet. I think I need the plastic pieces that connect to the cable for the sunroof to open and close. I can push the butt...
1996 Saturn SW2 1.9L engine VIN: 1G87K5273T
hello and thanks in advance for any help.this saturn runs fine untill it changes into over drive then it starts missing on the #3 clyinder.the compression is good,135lbs on all cylinders and it is in time at the chain.at the coil as well as the plugs #3 and # ...
2001 Saturn L200 2.2L Power steering pump VIN: 1G8JU54F21
Customer brings in this L200 with no Power steering assist. Reman pump was installed at another shop and the customer states that it hasn't work at all after the pump was replaced. Pump was filled and air was purged per GM bleeding instructions. After removing...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Roadmaster 5.7L Misfire VIN: 1G4BR82P8R
Thanks for the help. It did turn out to be tracking in the cap at the cylinder #2 terminal. I think one of the hoses to cap was off for a while, letting moisture in. Thanks again for the help.
2000 Cadillac DeVille 4.6L Stall VIN: 1G6KD54Y5Y
Thanks for the many responses. Many said the computer was toast if battery voltage goes too low or is interupted during reprogramming. The tech that tried to reprogram had a battery booster on the car as a precaution. Still not sure what happened but it requir... Trouble codes: P0385 (Crankshaft sensor problem).
2000 Cadillac DeVille 4.6L Cooling Systems VIN: 1G6KE54Y3X
This problem on the caddie was more for my information of the turn on times of the cooling fans, The replys I had gotten we very good and all sad the the turn on time is around 220 degrees and that is normal. Thanks Mark
2002 Cadillac Seville SLS 4.6L electrical VIN: 1G6KS54Y22
Thanks to all, replaced burned out brake lite bulb and car is fixed.
1989 Chevrolet G20 Sportvan 5.7L service engine soon lite VIN: 2SADC52GDC
Thank you all for taking the time to respond to this request! Most suggested disconnecting the battery which I had already done. However I thought of a prev. '89 vehicle (Jag.) that had a problem like this and left the battery on the Chev. unhooked overnight. ...
1992 Chevrolet C1500 Cheyenne 5.7L Likes retards VIN: 2GBEC19KXN
Hello all, Truck is fixed and running good. The ignition control module in the old distributor was faulty causing code 42, as I had suspected. That is why SES light went out when distributor was replaced. The rough running was caused by two open plug wires... Trouble codes: 42 (EST circuit fault).
1997 Chevrolet K2500 Cheyenne 5.7L No Start VIN: 1GCGK29R6V
I have been unable to fix this vehicle. I appreciate the help but most people suggested tests that require the vehicle to be running. Others wanted to know it's history but having just purchased it, I know nothing of it's past. I still have it and will post an...
1998 Chevrolet Cavalier 2.2L No Start, Cuts out, Stall VIN: 1G1JC1249W
Thanks to all that took their valuable time to help me with this one! Recieved some great responses! The biggest problem I was having was that after the car started tht first time Monday morning, it would always restart. Sometims it would start and idle flaw... Trouble codes: B1011 (VTD short this ignition cycle), B1012 (VTD bad R-Code this ignition cycle), B1013 (VTD bad timing this ignition cycle), B1021 (Loss of PCM serial data), B1022 (Loss of SIR serial data), B1023 (Loss of ABS serial data).
1999 Chevrolet S10 4.3L No Start, Stall VIN: 1G3445HFFH
after it got hot it died agian.i found that the disbutor was sending a signal to the coil. so i ran a new power supply to coil didn't make a differce..found coil to be bad even know it was new..accel super stock..
1999 Chevrolet Venture 3.4L passkey VIN: 1GNDX03E6X
I got a few suggestions, like checking for a broken wire in the column, doing a relearn on the system, disconnecting the battery for 15 minutes, & possible open circuit occurred while the van was running, making the light stay on. I disconnected the battery, t...
2000 Chevrolet Blazer LS 4.3L pressure diff. switch VIN: 1GNDT13W6Y
Thanks for the help . The open request shows that 4 of you replied , however I recieved only 2 as of time of closing this post . After removing tons of air with a syringe at the ABS unit , I was able to reset the switch by opening a bleeder on the front and wi...
2002 Chevrolet Cavalier 2.2L #3 cylinder VIN: 1G1JC12462
Good day and thank you all, 24 replies were very close in agreement. It is time for engine tear down, with either rings and/or exhaust valve causing misfire at idle. Josh from Iowa took alot of time and answered my question regarding why the misfire goes away ...
2003 Chevrolet S10 2.2L Poor Idle Quality, Hesitation, Stall, Poor Fuel Economy, MIL Lamp on VIN: 1GCCS145X2
t444644 88444 22 the rich code was caused by a restricted catylitic converter installed new converter and 02(#1) started to switch normally thanks to all who offered help!!! Trouble codes: 172B.
2003 Chevrolet S10 4.3L oil pan VIN: 1GTCT19X83
Thanks for everyones help, the oil leak is fixed. The oil pan does come out. The hardest part was separating the centerlink from the pitman arm, after that the diff. comes right out and plenty of room for the oil pan.Also it would have saved time if I knew how...
2004 Chevrolet Cavalier 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1JC12F34
first thanks to all who responded!!! most of you all had the same idea. the coil pack or module. well you were correct, we had no spark on cylinders 1 and 4. i called every parts store within 10 miles and no one had these items. so i tried a few local dealers,... Trouble codes: P0300.
2005 Chevrolet Uplander 3.5L air bag VIN: 1GBDV13LX5
Thanks to the prompt and helpful replies, especially to dave [...] from delphi who sent me all the info on the code and testing, others offered to send testing proceedure also, one tech suggested would still be covered by dealer and to talk to rep. Problem was...
2006 Chevrolet Suburan 5.3L Surge, Misfire, MIL Lamp on VIN: 1GNEK16Z66
Well after a lot of thought and rechecking we decided to remove the cyl head.we visually inspected it and coulndt see any thing wrong.we took it to the machine shop and had them vacumn test the valves.the intake valve on #7 wouldnt hold vacumn.they disassemble... Trouble codes: P0300.
2002 GMC Yukon SLE 5.3L abs VIN: 1GKEK13Z22
Thanks for all of the replies I received alot of great ideas.Somthing just did not seem right to me.So I scoped the two front wheel speed sensors,I found the left front did not range as far has the right.I knew the sensor was good so I checked for rust build u...
1999 Oldsmobile Intrigue GL 3.5L Hesitation, Cuts out, Misfire VIN: 1G3WS52H1X
Hello again and many thanks to the 7 who replied, all had good suggestions and Herman was the closest with cleaning the MAF sensor which I did and it had no effect, but got me thinking about the MAF and after watching it real close on the Solus noticed it wasn... Trouble codes: P0463.
2001 Oldsmobile Aurora 3.5L Hesitation, MIL Lamp on VIN: 1G3GR64H51
The mis-fire was very slight but registered on the scanner. I cleaned the injectors, replaced the spark plugs/boots and let it go for now asking the customer to return in two weeks or when she feels the mis-fire so that I may read the scanner again. Trouble codes: P0300.
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