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Prev Professional Automotive Repair Technical Discussions for August 14, 2007
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Open Help Requests for GM
Help Request Answers
1998 Buick Park Avenue 3.8L fuel guage VIN: 1G4CW52KXW
vehicle brought in for upper plenum replacement,battery was disconnect,upon completion of work noticed fuel guage had full swept all the way around to bottom side of the empty needle rest point. customer said the guage had worked properly before, any ideas
1997 Cadillac Catera 3.0L Oversteer VIN: W06VR52R7V
Hello All, I have a 1997 Catera that just had DIY front struts put on. Came in complaining of noises, loud grinding when turning right and backing up and popping noise going over bumps. Popping noise going over bumps is easy, both stabilizer bar links have V...
1999 Cadillac Seville STS 4.6L engine VIN: 1G6KY5491X
Vehicle will only overheat when you drive over 30 miles. Will not overheat when in the garage and idleing, Cooling fans cycle normally. Has had new water pump, hoses thermostat, cap, coolant. Performed gas analizer no combustion gas in coolant. When it overhea...
1999 Cadillac Seville STS 4.6L No Start VIN: 1G6KY5495X
hello all, this car was towed in, owner says crank no start, battery was dead, i charge battery , check for codes none.try to start, no spark or fuel pressure. i check for power at fuel pump in trunk no battery power,checked for rpm while cranking but my scann... Trouble codes: B2955 (key code input short to battery)
2005 Cadillac DeVille 4.6L HVAC, trunk release VIN: 1G6KD54Y75
This lovely Caddy has quite the problem. The HVAC does not work at all, doesn't even turn on, and the fuel/trunk release buttons do not work. I have verified power & ground to the HVAC control module and scoped the CAN bus at the module. All are fine. The fuel...
1995 Chevrolet K1500 Suburban 5.7L Stall, starts and stalls VIN: 1GNFK16K1S
Thanks ahead for help. This sub will crank and start fine, run for about 5 sec., then shut off. I still have spark and cranking rpm when the stall occurs. It seems to run longer when I have the alternator disconnected, but I ohmed out injectors, and they are b...
1995 Chevrolet Astro 4.3L injectors VIN: 1GCDM19W2S
hi guys and thanks for any insight into this pos. this van came into the shop on the hook. no start checked for fire at the coil, it was ok but none coming out the wire towers. cap was toast as well as the plugs wires and rotor button. still no start but goo...
1996 Chevrolet S10 2.2L Misfire VIN: 1GCCS1440T
OK, this is a weird one, I have never seen this happen before, and this is my own vehicle! See repair history. Every 2-3000 miles , the porcelin part of the spark plug comes loose in the threaded base of the plug.This only happens on cyl #3. You can move the p...
1997 Chevrolet K1500 5.0L Misfire VIN: 1GCEK14M1V
Truck came in running rough with CEL flashing. Missfire data indicated missfires on cylinder 7 only. Checked for vacuum leak with propane, none found. Checked resistance of plug wire on affected cylinder 1000 ohms. Swapped plugs on cylinders 5 and 7, miss stay... Trouble codes: P0300 (Random or multiple cylinder missfire)
1997 Chevrolet Monte Carlo Z34 3.4L lamp VIN: 2G1WX12X3V
Hi fellow techs, i have here a monte carlo that has no issues other than the security lamp stays on at all times, this is the old style key with the pellet on the key. I have not ever seen this system have a problem that would set the light on but still start ...
1998 Chevrolet Malibu 2.4L battery light VIN: 1G1ND52TLW
This vehicle was towed in with complaint of red battery light came on on highway. Then AC ceased to operate, guages wacked out and finally died. Inital inspection showed 6 volts output from alternator and battery would not hold charge. Replaced alt with NAPA p...
1998 Chevrolet Malibu 2.4L Engine VIN: 1G1ND52T4W
Hello all, Thanks for taking the time to read this. I have a car that is over heating. Antoher shop told customer it may be a head gasket because it was boiling out the coolant tank cap. We checked for head gasket by using shop air into the cylinders and brin...
1999 Chevrolet K1500 Suburban 5.7L tcc VIN: 1GNFK16R9X
see above notes and we post test results and fix info after repairs. we did not find a particular vehicle with these 3 codes in the archives, so anyone with this test info please respond.
1999 Chevrolet Blazer 4.3L compressor VIN: 1GNDT13W2X
I replaced faulty mode door actuator last month on this 99 T-10 Blazer with Automatic Climate Control (C68) as was only blowing heat all the time. Truck is back now with problem of AC compressor cuts on and off at random. Will work for several hours and then w...
2000 Chevrolet Blazer LS 4.3L convertor VIN: 1GNDT13W2Y
Vehicle came in with a strong shudder on engagement and disengagement of torque converter. no codes set. fluid clean. replaced torque converter, tcc solenoid, and filter& gasket. Customer returned days later saying that now the converter shudder is fixed but...
2001 Chevrolet Tahoe 5.3L 4 wheel drive VIN: 1GNEK13T11
How is everyone today. I could really use your help on this one. About three months ago customer stated service four wheel drive light on and gear selector lamps failed to illuminate. Scaned the vehicle and retrieved dtc CO308, a/b motor control circuit short ...
2003 Chevrolet Venture LS 3.4L valve train VIN: 1GNDX03E63
Customer packed van full of camping gear and went camping upon return van started "ticking" and lost power. Replace oil filter (due) no help, oil pressure is normal at 35 psi warm and at idle, pulled valve cover and verified no oil at valves, lower end quiet. ...
1987 GMC P3500 Value Van 5.7L not known VIN: 1GDHP32K8H
This truck was towed in a week ago not moving. Slipped in forward, locked up in reverse. Been a long time since I built a TH400. Found burnt forward clutch & burnt up planetarys. Installed full kit, planets, convertor, filter & modulator. Drove 10 miles, worke...
1997 GMC Safari SLE 4.3L Poor Idle Quality, Stall, Misfire VIN: 1GKEL19W6V
here is my problem. i found the lower intake gasket leaking coolant. so i replaced the lower gasket, without removing upper plenum. everything went smooth until i started it. it started right up but with a noticeable random tick which sounded like spark arcing...
1999 GMC K2500 Sierra SL 7.4L No power steering & no brake boost VIN: 1G7GK23J8X
This truck came in from a used car lot for a slapping noise in the left front when turning hard right. After verifying complaint the power steering and power brakes are inop. This truck has hydro boost. Power steering fluid level is ok, fluid is not foaming. B...
1991 Pontiac Firebird 3.1L Hesitation, Cuts out VIN: 1G2FS23T6M
This started out as a start and stall and going down the road quit on acceleration. did start back up. found alt excessive mill volts changed it no different. fuel psi fine even when it quits over 40 psi and does not drop off. Had on scope firing on this is 12...
2001 Pontiac Grand Prix SE 3.8L key removal
customer complaint: at times cannot get key out of ignition switch, while car was at the shop everything works fine. I tried working with the shifter on the floor to get the problem to repeat, with no success. Is this not getting all the way into lock position...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Regal GS 3.8L Starts & dies VIN: 2G4WF5212X
Found the Fuel Pump Resistor connector & bypassed it & the car starts & stays running now. Also had to replace the MAF for 0 freq. reading. Main fuel problem was the resistor . Thanks for all replies Trouble codes: P0102.
1994 Chevrolet Blazer 5.7L Poor Idle Quality VIN: 1GNEK18K1R
Sorry it took so long but i had a problem finding my distributor wrench that i have had for some twenty nine plus years so i had to get one from Snap on who doesnt carry them anymore and had to order one for me! also i had the alternator go bad as well. Once a...
1999 Chevrolet Blazer 4.3L differential/transfer case VIN: 1GNCT18W9X
A huge thanx for all the help. The problem was simpler than expected. Placed an electronic chassis ear on the drivetrain to try and isolate the noise from front differential to transfer case to no avail. After accelerating hard about six times on test drive wi...
2000 Chevrolet Prizm 1.8L unknown VIN: 1Y1SK5282Y
Had several replies. Decided to pull dash. Replaced evaporator.
2001 Chevrolet Blazer LS 4.3L timing cover VIN: 1GNCS13W41
Well, truth be known, we chickened out. The motor is rusting (oops, RESTING) quietly on a stand between bays. It goes back in in the AM. As there was a suggestion of an oil leak from the bell housing, and the customer agreed to new mounts while we were ther...
2004 GMC Envoy SLE 4.2L speedometer VIN: 1GKDT13S64
THANK you all for your support . i was away on vacation ,and became very busy. we change the closter and have had no futher problems. i wish to thank everyone for their support and looking forward, to being an asset to my peers in the near future MARIO TE...
1992 Oldsmobile Silhouette 3.1L No Start VIN: 1GHDU06D4N
YOU CAN READ THE REPLIES. The problem turned out to be that my neighbor got the two wires from the pickup coil reversed when he hooked them to the new module. The plastic retainer had broken and left them loose. He even drew himself a picture but got them w...
1991 Pontiac Grand Prix SE 3.1L Poor Idle Quality, LOW VACUUM VIN: 1G2WJ14T2M
thank you all for the help and sorry for the delay in reply. the customer eventually decided to donate the vehicle. most of the replies were for more common issues like to check fuel presure , exhaust back pressure, idle relearn procedures,egr, maf (which i...
1998 Pontiac Grand Prix SE 3.8L tcc VIN: 1G2WJ52K3W
Thanks for the replies. I am having to close this with a summary due to waiting on a customer decision and waiting for parts. At the moment we are waiting on the other solenoid and the line pressure sensor. When I know more, I will post the fix. Thanks aga...
2000 Pontiac Grand Prix GT 3.8L Blower Motor VIN: 1G2WP12K3Y
Thanks to all for the help. I went thru and checked all grounds and problem still was there. Replaced the ignition switch and all is good. Again, thanks to all that helped.
2000 Pontiac Bonneville SLE 3.8L ride control VIN: 1G2HY54K4Y
Thanx to all that offered help, hard as I tried I could not get the customer back in to look at the vehicle. Many thanks to all that took the time to read and offer help to this post.
2002 Pontiac Grand Am SE 3.4L No Start, Cuts out VIN: 1G2NF52E52
Thank you to all that replied to my HELP !!! REQUEST , after sitting on this for a extra day I got alot of help from my other mechanic , as some of you suggested to recheck my crank sensors although we could see rpm we finally did a resistance check on crank ...
1997 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZJ5279V
all said it needs plugs, wires and maybe coils - we did solve the starting problem and customer will return for tune up next monrh - thanks for all the input joe Trouble codes: 340 (cylinder detect signal missing).
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