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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 8, 2010
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Open Help Requests for GM
Help Request Answers
2004 Buick Rendezvous CXL 3.6L No Start VIN: 3G5DB03704
Went on a service call for a dead battery. It had headlights but they were dim. Battery voltage was 9 volts. I put my jump pack on it and attempted to start it. No crank. I noted security light on and went back to get a scan tool. Found all kinds of communicat... Trouble codes: P1631
2004 Cadillac Escalade ESV 6.0L gauges and charging VIN: 3GYFK66N7G
customer brought this in complaining of an interrmittent problem with the gauges all going inop. If the vehicle is driven long enough the battery seems to drain. Once the vehicle died on the road and the batt. was dead and would not crank, was jump started and...
1996 Chevrolet K3500 6.5L cruise control VIN: 1GBJK39D46
Ok guys here is another weird one. This truck came in to the shop with the cruise control inop and the idle up feature for the pto was inop. Here is what the technician checked. With the Tech 2 connected we watched the cruise and brake switch outputs the cruis...
1997 Chevrolet Astro 4.3L Hesitation, Stall VIN: 1G6KD54Y1Y
This vehicle is owned by a blacksmith who works in my plaza he has had an ongoing problem with his van after a hard corner about 100 m out of the turn the car wants to stall out it will only stall out if you hit the brake. if normal gas is applied or you let o...
2000 Chevrolet S10 4.3L master cylinder VIN: 1GCDT14W8Y
came in the shop for leaky caliper and changed rusty brake lines. So i replaced driver side front caliper, both rubber hoses, and driver side front brake line. Had problems bleeding it and found that the master cylinder was bad. So i changed that as well. Bled...
2001 Chevrolet Monte Carlo SS 3.8L Starting VIN: 2G1WX15K41
car came on hook no start but cranks ign switch very sloppy dealer repinned new lock cyl with senser did relaern car started ran perfect test drove one block later car shut off cranks but no spark has fuel pres inj pulse security light alternates with battery ...
2002 Chevrolet Cavalier 2.2L Stall VIN: 1G1JC52402
stall on hard acceleration or bumping rev limiter on no load ,no codes,fuel pressure is good,ignition fails,starts fine after stall but only when key is returned to off and on again,mac mentor freezes and must be reloaded after each stall,replaced ing.switch,c...
2003 Chevrolet Express 2500 5.3L Overdrive VIN: 1CFG25T731
To all the GM techs. Just to verify, if the Tow/Haul light is flashing, and the trans is shifting in and out of overdrive, Does it need to have the trans gone through or is it an electrical issue? Alldata does not give any info for checking this. And I have no...
2004 Chevrolet Silverado 3500 6.6L codes VIN: 1GCJC33264
Hi Guys, Got this 2004 chevy duramax with p2122,p2138,and p2139 codes.No driveability problem that I know of.With volt meter I have 5 vref and grounds at the app sensor plug when it is plugged up and unplugged..On scan tool when connector is plugged into senso... Trouble codes: P2122 (app sensor 1 circuit low), P2138 (app sensor 1-2 correlation), P2139 (app sensor 1-3 correlation)
2005 Chevrolet Impala 3.8L Poor Idle Quality VIN: 2G1WH52K35
we have a 05 chevy impala with a 3.8 vin k engine it has a rough idle no misfires or drivabilty symtoms other than idle when u pull oil fill cap off it sounds and feels like exhaust pressure in the crankcase with thought upper intake plenum may be melted but i...
2007 Chevrolet Impala LS 3.9L Poor Idle Quality, MIL Lamp on, idle will raise VIN: 2G1WU58R17
Another tech has a impala came in with po121 code and customer complaint of surge. Technician replaced air box(airfilter box with maf sensor in it)The vehicle appeared ok, did not surge but after driving 20 minutes idle started to raise and was running at arou... Trouble codes: P0121, P0507
2009 Chevrolet Silverado 1500 LT 5.3L brake controller VIN: 3GCEK23359
I installed a Voyager trailer brake controller on this pickup, but it doesn't work. I have no power to the controller. I called the company to make sure I have the wiring correct, checked fuses and all are ok, but no power. It has an Integrated Trailer Brake C...
1998 GMC Savana 2500 4.3L Misfire VIN: 1GTFG25W7W
Help this makes no sense everything appears to be there for this to run right but it wont. loosing hair fast. Misfire on 5 and 6 cyl constant at idle seeems to clear up a little at higher rpms. Replaced intake gasket and updated injector assy to newer style ef... Trouble codes: P0300 (Random misfire), P0306 (6 misfire)
1997 Pontiac Sunfire GT 2.4L 3-4 slips lots VIN: 1G2JD12T8V
customer complained of clunking while shifting check codes got 730 incorrect gear ratio.when code sets line pressure is commanded high and tranny clunks while shifting but will still slip a bit from 3rd to 4rth.when code is cleared tranny slips way more.now it...
1997 Pontiac Sunfire SE 2.2L MIL Lamp on
Replaced Head Gasket and other related gaskets due to water leaking externally from head. Month later came back with rough running car, although it seemed to run fine while I had it at the shop. Found the two codes (crank & cam sensors) Cleared them, told them... Trouble codes: P0335 (Crank sensor), P0343 (Cam Sensor)
1998 Pontiac Trans Sport 3.4L Surge, Misfire VIN: 1GMDU06E6W
When pulling a hill it has a jerking feeling almost like being in a truck's back wash, or when an egr valve is bad. EGR valve,O2 sensor and mass air meter have all been replaced. Tested fuel for excessive alcohol. When trans is in 100 % lockup it shows up. Whe...
2007 Pontiac Grand Prix 3.8L blower moter VIN: 2G2WP52285
hello iatn. this car cam in to the shop with when you turn on the wipers system, the blower motor turns off sometimes. have been able to get it to do it in the shop a few times. looked at the connecter for the wipers. have printed both the wiper and blower mot...

Fixes & Summaries for GM
Fix/Summary Answers
1991 Chevrolet K1500 Silverado 4.3L Hesitation, Cuts out VIN: 2GCEK14Z2M
thanks for all the replies and i apologize for the lack of data. we became really busy and i was running around like a wild man. most of you said egr valve and fuel pressure related. some others suggested vaccum leaks/distributer related problem. tried new egr...
1995 Chevrolet K3500 5.7L 2-3 shift VIN: 1GBHK34KXS
After rechecking everything inside and out,with an atsg manual,I cannot find anything wrong with trans, all clutches and bands are new, rechecked valves in valve body, If you let off gas before it defaults to second it will shift to third & doesn't slip, then ...
1995 Chevrolet K1500 5.7L wipers VIN: 2GCEK19K4S
thanks for all the help guys replaced with another reman still no good replaced printed circuit board still no good, but as a note everyone all of the boards did have a break in the soldier or and one had a break in the printed board still scratching head add...
2002 Chevrolet Express 2500 5.7L Poor Idle Quality, Hesitation, Cuts out, Poor Fuel Economy, MIL Lamp on, P0308 VIN: 1GCGG25R72
Thanks for all your help. I had installed all new Delco parts when I installed the engine. Now only a few thousand miles later, they failed. All the parts are still covered at the dealer so I replaced them all. Then I also replaced the distributor assembly. Th... Trouble codes: P0308 (Mis fire cyl 8), P0404 (Egr performance).
2003 Chevrolet Malibu 3.1L blower motor VIN: 1G1ND52J03
This issue looks to be solved. This vehicle was not equipped with a sunroof to answer some of your questions. Had some conflicting information from our customer about the windshield(Father thought it had been replaced, Daughter said no.) We then focused more ...
2000 GMC Sierra 1500 SLE 5.3L Excessive Emissions, Misfire, MIL Lamp on VIN: 1GTEC19T8Y
thanks all of you techs for your help, problem was found at the fuel pressure regulator, also found Intake manifold leaks. Trouble codes: P0300.
2002 Pontiac Grand Prix GT 3.8L Misfire VIN: 1G2WP52KX2
Thanks for all the replies. I recieved 24 so it would take too long to reply to all of you individually. I recieved suggestions from bad plugs, wires, injectors, and etc. Anyway, I finally broke down and built an exhaust backpressure tester. Using it I fo... Trouble codes: P0300.
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