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Prev Professional Automotive Repair Technical Discussions for June 27, 2007
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Open Help Requests for GM
Help Request Answers
1990 Buick Regal 3.1L No Start VIN: 2G4WB14T7L
hey all you old buick techs or anyone who might have seen this. this car is a no start. has good fuel pressure, injector signal, no codes, but ...no spark. it will spark when you turn the key on or off. every once in a while it will run, but let it sit overnig...
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1992 Buick Park Avenue 3.8L no crank VIN: 1G4CW53LXN
I have a no crank condition on this park ave.Theft module replaced 2 weeks ago,after checking found no resistance across small white wires from lock cylinder.Removed lock cylinder and found one broken wire near the lock cylinder.Replaced lock cylinder.Still ha...
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1995 Buick Riviera 3.8L Hesitation VIN: 1G4GD22Y35
Customer reports engine loses power, hesitates and car will not go above 30mph. after driving hot for one hour and twenty minutes on the highway. Problem occurs at the same point of each trip...her commute is 2 hours. Pretty clean car, regular customer, good h...
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2001 Buick LeSabre Limited 3.8L No Crank VIN: 1G4HR54K41
Thanks beforehand to all for taking the time to help. The customer has a problem with the car where at times the car will not crank but the battery is fine and all other accsories work fine. I scanned with a Tech 2 and we have 2 codes in the Theft Deterrent Co...
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1989 Chevrolet Corvette 5.7L No Start VIN: 1G1YY3186K
THIS CAR CAME IN WITH NO START. FOUND NO INJECTOR PULSE WITH NOID BUT DO HAVE DISTRIBUTOR REF @ ECM. CHECKED ALL FUSES AND GROUNDS, INJECTORS ARE POWERED UP AND HAVE FUEL PRESSURE. CHECKED PELLET AND IGN LOCK CYLENDER FOR BROKEN WIRES. CAR WILL CRANK WHICH IS ...
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1992 Chevrolet S10 2.5L Stall, MIL Lamp on, Code 51 VIN: 1GCCS14A3N
Hello Techs, Iam looking for a source for a PROM . SCAN CODE FOR PROM IS 6681. Dealer says part is discontinued. Thanks for any help. I am in south Texas, near Corpus Christi Trouble codes: 51 (Prom Fail)
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1992 Chevrolet Lumina 3.1L compressor VIN: 2G1WL54T8N
car came in with a/c clutch relay jumped. tested circuits have two powers at relay no ground from computer. if i ground the ecm terminal clutch engages. hooked up scanner has a/c request from control head, has power steering pressure sensor working, and also r...
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1992 Chevrolet Blazer Cheyenne 5.7L No Start, Poor Idle Quality, Misfire
This is not the typical Thottle body system, this is a completly rebuilt block, new heads, edlebrock Sequential port fuel injection system. I did not do the install of the motor and all above mentioned parts. This vehicle came to us with a lack of power and mi...
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1997 Chevrolet Lumina 3.1L No Start, Poor Idle Quality, Misfire VIN: 2G1WL52M7V
This car came to me on a hook. Customer stated that on his way down the highway, he experienced a couple of "bucks" acting like a misfire. It eventually lost power and stalled out. After it sat here for a few days till I could look at it, it started very rough... Trouble codes: P0121, P0300, P0420, P1106 (MAP sensor circuit intermittent high)
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1998 Chevrolet Corvette 5.7L air flow VIN: 1G1YY22G4X
The air flow out of the dash vents, defroster, and the floor vents seems to be restricted. Plus the passengers side is cooler than the drivers side. The air flow on the passengers side is a little more also. Hooked up the Tech 2 and found no codes, commanded t...
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1998 Chevrolet Venture 3.4L Rear Brakes Parking Brake VIN: 1GNDX03E6W
This is embarrassing. This is my own car!! The brakes are noisy, which is a common problem. But my noise is a clicking coming from the rear brakes. Inspection reveals the park brake spring inside the rear drums is hitting the hub studs (on back of hub), making...
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1998 Chevrolet K2500 Cheyenne 5.7L Hesitation, Cuts out VIN: 1GCGK24R5W
no codes all pids look fine all fuel trim fine. fuel pressure to specs and incresses with throtle.have tryed know good maf, ing module. coil. will hesitate and bake fire thur intake when steping hard on gas. happens at idle or on the road. never stalled but ha...
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2001 Chevrolet Express 1500 4.3L Hesitation, Misfire, MIL Lamp on VIN: 1GCEG15W81
This one has got me stumped. Customer complaint is MIL on and pinging noise under load or at highway speeds. Test drive vehicle, with Tech II scan tool, and watch misfire data. Found that cylinder #2 is misfiring on scan tool but no noticable misfires are felt... Trouble codes: P0300 (multiple cylinder misfire), P0302 (cylinder 2 misfire), P0335 (crankshaft position sensor circuit)
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2004 Chevrolet Trailblazer LS 4.2L fluid level VIN: 1GNDT13594
this trailblazer has been serviced by our shop since it was new and customer is always on time getting oil changed etc. at 33,000 we found transfer case 1.5 qt. low on fluid with no sign of leakage.being that we were close to the end of warranty we checked it ...
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2004 Chevrolet Suburban 2500 LS 8.1L Suspension VIN: 1234567989
ok i have 04 sub 2500 4x4 with electronic suspension control does not have air system like 1500 models have.its a ride damping with electric solinoid that controls shocks. Its in full up position on rear. I have notfound any diag. info other than it has a modu...
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2001 GMC Savana 2500 4.3L Misfire, MIL Lamp on VIN: 1GDGG31W21
Thanks in advance for all your help. I have searched the forums to no avail. This is a 2001 Savana cutaway with a 10-foot box (old Penske unit.) It idles somewhat roughly, but won't stall. I had thoroughly checked all the wiring from the PCM to the coil, and i... Trouble codes: P0351 (Ignition coil 1 Primary/Secondary circuit)
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2003 GMC Sierra Denali 6.0L MIL Lamp on VIN: 2GTFK69U13
thanks to anyone that can help me here i have this denali that will turn the engine light on for this evap code. i performed the required test and it led me to replace the evap canister vent solenoid. vehicle left shop and came back approx 3 weeks later with ... Trouble codes: P0446
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1991 Oldsmobile Cutlass Supreme 3.1L No Start, no injector pulse VIN: 1G3WH54T84
would not start has spark, good fuel pressure . injectors do not pulse, has new computer, ignition module,crank sensor and plug replaced checked all wiring no breaks or shorts
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2000 Oldsmobile Intrigue GL 3.5L duct work
went over everything that I could think of system seems to be working fine cold as can be on pass side hot on drivers never seen this any help would be great
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2002 Pontiac Grand Am GT 3.4L Lack of power VIN: 1G2NV52E82
This car came to me a week ago. Customer complained of lack of power. There was no check engine light on at this time. Went to the fuel filter and changed it, "black" fuel came out. Changed the filter added a cleaner and told the customer to see if that helps. Trouble codes: P0420
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Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Park Avenue 3.8L A/C Vents VIN: 1G4CW52KXV
Thanks for all the help, decided to look at the mode door values again and my readings were now normal hmmmmm, so why was this system not working properly? Was able to get my head under dash and with the help of a mirror I was able to see the mode door actuato...
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1999 Cadillac Seville SLS 4.6L engine temp VIN: 1G6KS54YXX
THANKS TO ALL WHO TOOK THE TIME TO REPLY, THE END RESULT WAS HEAD GASKET FAILURE IT FINALLY FAILED A BLOCK TEST UPON REMOVAL OF HEADS IT WAS OBVIOUS IN 2 SPOTS OF SEALING RING DAMAGE THANKS FOR ALL THE GREAT SUGGESTIONS
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2005 Cadillac STS 4.6L Navigation System
Thanks to all who replied. I have searched Cadillac forums as well, and there is apparently no way to use the nav features while moving without installing a lockpick for several hundred dollars. There are ways to watch DVDs while driving, but that would be t...
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1991 Chevrolet C2500 Cheyenne 7.4L Poor Idle Quality, rough VIN: 2GTGK29N6M
Hi and thanks again. As I seemed to has assumed something such as base ignition timing, which was 14 degrees advanced beyond specs, setting that correctly took care of the terrible cold idle, however the system was still lean and did still have a rougher than ...
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1991 Chevrolet Beretta 2.2L Poor Fuel Economy VIN: 1G1LV13G1M
I have the car running like a top thanks for the input I found gas in the vacum lines checked the fuel regulator and that was it
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1996 Chevrolet C3500 Cheyenne 7.4L No Start VIN: 1GCHC39J3T
thank you to those who help. I have fixed the problem. The distributor is no good. I replace new dis. and everything work fine. thank again, thoa
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1997 Chevrolet Express 2500 5.0L Excessive Emissions, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCFG25M8V
i recieved a wide rage of replies on this one but Dan from Texas had the answer , he suggested checking the fuel press with the key on ,then checking with the key off , this wasthe rite answer with the koeo the fuel press would dop imediatly with the key off t...
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1999 Chevrolet Malibu 2.4L No Start, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G1ND52T1X
Thanks for all the heil, it ends up is fuel contaminated problem, after I recheck the fuel filter, 1/3 of it drain out is dirty sludge, I know cleaning the tank will fix my problem, a lot of tech mention high oil pump pressure, I recheck my at cold 80PSI, I al... Trouble codes: P0300 (Multi cyl misfire detected), P200.
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1996 GMC K3500 Sierra SL 6.5L MIL Lamp on, lacks power VIN: 1GTHK39F4T
well I replaced the wastegate solenoid and so far no reported problems so thanks for all the replies Trouble codes: P0236.
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2000 GMC C3500 HD 7.4L Poor Idle Quality VIN: 1GBKC34J5Y
customer has yet to return with vehicle, but thanks to all who helped. the big ideas were to look for intake leaks, which we replace, fuel regulator which we replaced, and to check cam timing, which I would like to check when vehicle returns.
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2004 GMC Sierra 1500 SLE 5.3L Hesitation VIN: 2GTEK13T34
Customer was still having concerns with vehicle, we had replaced the spark plugs with original equipment at 90,000 miles, we remove spark plugs to inspect, found 3 spark plug wires to be arcing, we replaced the spark plug wires and the spark plugs, concern if ...
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2001 Pontiac Bonneville SSEi 3.8L MIL Lamp on VIN: 1G2HZ541X1
Well, After going round and round with the owner, I have not fixed this car. Turns out the dealer has allready taken a few guesses and replaced all of the vacuum hoses and MAP sensor and MAF senosor. After checking a few things, I could not find any ECU upd... Trouble codes: P0401 (Insuffiecient Egr Flow Detected).
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