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Prev Professional Automotive Repair Technical Discussions for August 20, 2007
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Open Help Requests for GM
Help Request Answers
1970 Cadillac Deville 7.7L A/C system
A/C pressures are normal. Temp inside vehicle is cold, blower operation is fine. Only problem is that when driving down road the temp increases to warm but when at idle for a few seconds the temp goes back to cold. Tried looking at all vacuum sources, installe...
1992 Cadillac DeVille 4.9L water pump VIN: 1G6CD53B7N
Help, I have a great customer with a not so great car, 92 Cadi DeVille 4.9, and it keeps eating water pumps (5 pumps in 3 years & only 25K). The bearings fail & grind. I have installed new Delco, Napa and GMB pumps & all have failed. The last time I installed ...
2002 Cadillac Escalade 6.0L Electronic VIN: 1GYEK63NX2
Got an 02 Escalade that intermittanly sets a c0282 code and the service stability system light illuminates. It only does it after a long drive (over 45 minutes long). And since it only does it intermittanly its very hard to get it to happen when I can get it i...
2004 Cadillac Seville SLS 4.6L MIL Lamp on, extended crank VIN: 1G6KS54Y04
Fellow cadillac techs, is the crank sensor decode mode a valid test found in the flow chart for p0335 on step 7. Wires from crank sensor A to pcm ohm good and are not shorted to power or ground. When commanding "time A" in decode mode and touching my test lite... Trouble codes: P0335, P1372
1946 Chevrolet pick up 235CID Excessive Emissions, Poor Idle Quality
just need timing specifications for this motor. dist was 180 out. reset dist.now runs but cannot time due to lack of info . pointer on bellhousing but no marks on flywheel. have pulled #1 plug to locate tdc.painted area at flywheel for reference guide. any hel...
1991 Chevrolet K1500 Cheyenne 5.7L Mechanical VIN: 1GCDK14KXM
Installed a reman Evergreen Engine from Autozone that customer supplied. This was a short block only. Heads were pressure tested and surfaced. Checked out good. I have yet to get this engine running right. Seems to be a normal stock cam, nothing fancy. Engine...
1999 Chevrolet Silverado 1500 5.3L Hesitation VIN: 2GCEK19T8X
We have a 99 silverado that has a very bad hesitation in it. The problem occurs after at least 4 hour sit. Ambient temp not related. This is a open loop issue. Closed loop it is fine. The truck idles perfectly but falls on its face and pops from intake with to...
1999 Chevrolet Tahoe LS 5.7L Misfire VIN: 1GNEK13R9X
Owner brought this Tahoe in about 3 weeks ago with a bad miss. Scan tool said 3 and 4 cylinder misfire with number 4 being the worse of the two. Changed plugs and wires. No help. Decided to check compression on number 4. Gauge read 0 PSI. Put air in cylinder w...
2000 Chevrolet Malibu LS 3.1L instrument cluster a/c door lock & windos VIN: 1G1NE52J5Y
I'm orking on a 2000 chev malibu which has an intermitent problem which causes the instument cluster, the A/C, the power door locks & powere windows all to go dead for a few minutes then come back. It has not happened with me yet, only the customer (i believe ...
2000 Chevrolet S10 4.3L fuel lines VIN: 1GCCT19W9Y
after setting the intake manifold in place i had trouble getting the fuel lines to thread together at the back of intake. I decided to remove the lines from where they go into the plastic fuel plenum behind the throtle body. each line has a black plastic sleav...
2005 Chevrolet Trailblazer LS 4.2L Blower Motor VIN: 1GNDT13SX5
Customer came in complaining of A/C blower motor stops working and ABS, Brake, Air Bag and Trac lights all come on when blower motor stops working. Turn the key off and back on blower motor starts working again (Only on high) and lights go off. After starting ...
1997 GMC Safari SLE 4.3L MIL Lamp on VIN: 1GKDM19W8V
Customer stated that the van stalled on the freeway. Pulled over and restarted with a high idle. Drove it home and the next day it started and stalled three times. After that it ran perfectly fine. A couple of days later the check engine light comes on. (I'm a... Trouble codes: P0420
2003 GMC Sierra 1500 SLE 5.3L 4wd VIN: 1GTEK19T33
Vehicle came in with service 4wd displayed on dash. Scanned T-case module codes are: C0300, U1026, U1000. need help deciphering codes. Currently MOD Pc is in for repair no access is available. Thank you in advance for assisstance.
2003 GMC Yukon XL 1500 Denali 6.0L ride control VIN: 1GKFK66U33
customer claims he had a vibration in the seat at about 118kmh. The vibration existed with customers exisiting tires, the new 22" tires as well as a test set of P265/70R16 from another vehicle. We have balanced and road force balanced the 22" wheels. The unive...
2003 Oldsmobile Alero GL 3.4L Extended Crank VIN: 1G3NL52EX3
Check MAF, ok Checked TPS, ok Checked IAC, ok Checked Oil PSI Sensor, ok Checked Battery, ok Checked Starter, ok Checked Charging System, ok Checked MAP, ok Checked KV on Coil, ok We have had codes of P1189 - EOP Switch Circuit B1365 - Ign 0 Circuit Malfuncti...
1995 Pontiac Trans Sport 3.8L Poor Idle Quality, Hesitation, Surge, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GMDU0610S
thank in avanced. this concern is interment. i'm a ford guy with some gm experence,this van gives a 325 code for esc i cant find this code listed anywhere,we have alldata in our shop and it not there, did a search online found a couple of hits onknock sensor f... Trouble codes: 325 (esc failure)
1995 Pontiac Grand Am SE 2.3L oil pressure VIN: 1G2NE55D7S
Car came in because oil light was staying on. Just came from another shop that had tried replacing the oil pump to fix this issue. After the repair, light was still on, and that shop recommended a motor. So this is where I stepped in When I first looked at it...
1997 Pontiac Bonneville SE 3.8L passlock VIN: 1G2HX52K9V
car came in on hook no start security light flashes when it dont start very intermitant starts almost always put new passlock in 1 week later costomer came back said one key started it one key didnt she brought both keys in i tried them they both worked called...
2003 Pontiac Grand Prix SE 3.1L Blower Motor & DRL VIN: 1G2WK52JX3
Thanks to all who take time to help w/this request .Customer complaint of blower motor inoperative all low speeds and intermittent inop high speed. To start found no power being supplied from resistor assembly in any low speeds. Replaced resistor. Power presen...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Century Special 3.3L Stall VIN: 1G4AG54N7N
Thanks all, I guess I just didn't give the vehicle enough time to duplicate problem. checked crankshaft sensor with vantage pro and saw it glitching but vehicle was still running fine. after running vehicle at approx 2500 rpm with engine hot it finally started...
1997 Buick LeSabre Custom 3.8L engine VIN: 1G4HP52K3V
Thanks for all the responces. It was the upper intake. By my responces, I guess these are fairly common. I would like to share one responce. He said his vehicle had a clogged exhaust which obviously excellarated the problem with the intake or caused it. All th...
1998 Buick Park Avenue 3.8L Mechanical VIN: 1G4CW52K5W
After reading all 9 replies. I attempted to bleed rear brakes, with no success. I put all wheels on and drove vehicle. Pedal is hard, but no rear brake pressure. Put it in an ABS stop and ABS pump worked along with front brakes, but no change in the rear. At...
1994 Cadillac Fleetwood 5.7L Safety VIN: 1G6DW52PXR
We fixed the Caddy. We tried installing a 6k resistor in the wiring harness plug right at the CCM Box (Mounted in the tunk). This eleminates all of the wiring from the IGN lock cylinder back to the CCM and the cylinder it's self. Again it seemed to be fine f...
1986 Chevrolet Sprint 1.0L turn signal switch VIN: 1G1MR0858G
hey guys,sorry ive taken so long to close,this got stuck on a back burner.most were giving me a delco # but this is all suzuki.doug from ill.gave me www.car-parts.com,glenn from n.j. backed that up i found the part for $70.00 plus shipping.another good source ...
1999 Chevrolet Tahoe LS 5.7L Misfire VIN: 1GNEK13RXX
We did a compression test on the tahoe. Here is what we found.Number 5 nad 3 had 120 lbs and the rest had 185. So I would have to say a valve problem.Customer did not want me to go any further . I would have liked to do a leakdown but he did not want to spend ... Trouble codes: P0300.
1999 Chevrolet Blazer 4.3L compressor VIN: 1GNDT13W2X
After further testing I found the female terminals at the ambient sensor at grille were damaged. Repaired terminals and intermittent sensor operation returned to normal. One note is that the climate control module in not part of the BCM but is part of the AC c...
2000 Chevrolet Express 3500 LS 5.7L Hesitation, no power under load VIN: 1GAHG39R8Y
Bob from Arizona gave a nice pearl of wisdom: "Don't ever trust the customer's test..." He was referring to the back pressure test done by the customer, but as it turned out, when the customer told me that he changed the fuel filter, he really meant he "checke...
2007 Chevrolet Silverado 2500 HD LT 6.6L tpm VIN: 1GCHK23607
Thank you for the great responses. The majority stated that the tire pressure monitor functions are held in the RCDLM (Remote control door lock module). Once in there, don't go to special functions, it's not there. Go to module setup (I think that's what it wa...
1993 GMC G2500 Vandura 4.3L wipers VIN: 1GDEG25Z0P
Thank you for the replies everyone. The customer picked up the vehicle and would not give us any more time to work on his wiper problem. If we do come up with any new ideas we may be able to have him come in for some quick tests. I tried all the suggestions wi...
1997 GMC Safari SLE 4.3L Poor Idle Quality, Stall, Misfire VIN: 1GKEL19W6V
Well guys, this is one to go in the textbook as "what happens when the basics are overlooked". When I changed the intake gasket I knew that I had one bolt that had fallen down into an intake port. and during the repair , my son , who was helping me, had pulled...
2000 GMC Sierra 1500 SL 4.8L Poor Idle Quality, Hesitation, Misfire VIN: IGTEK14V9Y
phil ,larry and mark all hit this one pretty dead on...it was the injectors and rail, that were causing multiple missfires...thanks for all you're help again! Trouble codes: P0300.
2003 GMC Savana 2500 4.8L No Start VIN: 1GDGG31V03
Thanks for all replies, I changed the lock cylinder,still had same problem,it seems that the Passlock Computer is not communicating,I checked all wiring ok, I'm replacing module & that will do it. Thanks for all the help
1989 Pontiac Grand Prix 3.1L Hesitation, Cuts out, Stall VIN: 1G2WJ14TXK
You guys hit it right Thank You for the help.Injectors were shorting out and shutting that bank down.Thanks again.
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