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Open Help Requests for GM
Help Request Answers
1994 Buick Roadmaster 5.7L theft deterrent module
The above vehicle was brought in to us with a no crank no start condition. We diagnois it as a bad theft deterrent module . We ordered the module but can not locate module on the vehicle. We have removed the dash pad and looked in every other place that the sc...		 View
1983 Cadillac DeVille 4.1L Hesitation
hi, i have this cadi here with a bad hesitation. fuel pressure looks good, 6.5 psi at idle and at 2000 rpm. alldata says 5.5-6.5 at idle. map reading 2 volts at idle with 18 inch of vacuum. throttle sweep checks out good. during accel the car moves then falls ...		 View
1999 Cadillac Catera 3.0L Timing Belt
We have tried several times to install the cam gears on the camshafts and have been unable to get them to line up correctly. But since we didn't remove them we aren't sure which way the notches on the camshaft line up to the cam sprockets. The Mitchell diagram...		 View
1986 Chevrolet S10 Blazer 2.8L Stall
vehicle came in for no power and stalling all times.cust complained of fuel smell all times.removed air cleaner and found one injector unplugged and bleeding fuel into intake.replaced injector.cleaned plugs due to fouling.started engine with both injectors plu... Trouble codes: 42 (est circuit).		 View
1996 Chevrolet Suburban 5.7L Hesitation, Misfire
Help, my own truck is killing me! What started out as a very intermittent glitch that was barely noticeable has turned into cylinders misfiring and the truck still drives but is not much fun to drive anymore. I have mostly cyl. #4 misfiring but they all will d... Trouble codes: PO300 (cylinder misfire).		 View
2002 Chevrolet S10 Pickup 4.3L Misfire, MIL Lamp on
truck came in with a misfire code po304. gave it a complete tune up and it returned 2 days later with same code. bulletins said possible cpi. changed the spider assembly to the newer updated version. all seemed ok at the time checked for misfire counts at idle... Trouble codes: P300 (multiple misfire), P304 (cylinder misfire 4).		 View
2002 Chevrolet Impala 3.8L Cuts out
This car when driving down road and under moderate accel the car will jerk/buck. The tach drops approx 500 rpm ( I think tach is just responding to jerk ) I've monitored data with scan tool and nothing seems too stand right out. Fuel pressure is ok, good spark...		 View
2003 Chevrolet Astro 4.3L No Start
this astro van came in with a no start with code p1626. ive traced the code and now consider it to be from extended cranking time.the security light does not stay on or flash either. the vehicle has good spark and injector pulse, balance test showed injectors ... Trouble codes: p1626 (theft fuel circuit).		 View
2004 Chevrolet Tahoe 4.8L vehicle is possibly in reduced power mode, but does not show on display
need to know if anyone has dealth with such a problem, as mentioned in the repair history?		 View
2000 GMC Pickup 6.5L No Start, Stall
Thanks for looking. I have this truck eating my lunch. The thing I noticed is my control signal(green wire) is nice and square while running. Signal drops and engine dies immediatley. I loose the closure signal. I get a pulse from the green wire while cranking...		 View
1975 Oldsmobile Cutlass 7.5L brake pedal
This car was brought to us to get running after a restoration. We have bled the brakes and get a strong stream of fluid at all 4 wheels using a power bleeder. When you step on the pedal only the front brakes apply. The pedal is hard as a rock and will barely k...		 View
1999 Oldsmobile Intrigue 3.8L alternator
wondering if there is a trick to getting the alt out on a 3.5 intrigue thanks guys		 View
2000 Oldsmobile Alero 2.4L theft system
The car had an intermittent no start that happend pretty regular, fuel disable codes were stored in the pcm. I replaced and reprogrammed the passloc sensor and it worked great i cranked it up at least 30 times in a row and it never went into security once. the...		 View
1988 Pontiac Fiero 2.8L lock up
This car originally came in for a die at stops. Found TCC solenoid sticking. Simple fix. Customer returned saying that it is not going into lock up. Test drove and verified. Checked power and gound to solenoid good. Replaced solenoid again, still same problem....		 View
2004 Saturn Ion 3 2.2L Compressor
System is full to spec, replaced burned ac clutch fuse, when AC is selected, compressor clutch engages for one second, then off for 3-4 seconds, then engages/disengages again. Also turns on the SES light, producing a code PO700, trans control system fault. Any...		 View

Fixes & Summaries for GM
Fix/Summary Answers
1982 Cadillac DeVille 4.1L long block
As most of you noted, nobody wants to touch this engine. 3 national rebuilders and 1 local machine shop refused to touch it. 1 person suggested an older cast iron engine and 1 stated to convert to a 4.9. after discussion with my customer, they decided to scrap...		 18
2002 Cadillac Seville 4.6L Engine
Thanks for your tips and leads, which lead to various problems the vehicle had that lead to the repair.		 12
1957 Chevrolet corvette 283CID slip yoke
Replies said that the snap ring shouldn't be there. Removed and now slipyoke slides in all the way. Thanks for the help.		 17
1990 Chevrolet Lumina 3.1L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall
First of all I'd like to thank everyone for their help. The problem turned out to be 2 shorted injectors. Replaced the two bad injectors and the car runs great now! Trouble codes: 33 (MAP Sensor high voltage low vac.).		 20
2004 Chevrolet Blazer 4.3L Poor Fuel Economy
many thanks to all who contributed to my delemma, finally hit the nail on the head: per Mr. Banaszaks suggestion, checked for secondary issues: found ac compressor clutch my demon, did fuel mileage check with ac on and then without:11.7 mph with ac on--- 18.5...		 13
2005 Chevrolet Cavalier 2.2L No Start, MIL Lamp on
Gordan & Patrick where right on track. Just had to go into Alldata and follow relearn procedure. Which is #1 turn ON the ignition, with the engine OFF. #2 Attempt to start the engine, then release the key to ON, vehicle will not start. #3 Obvserve the SECURI... Trouble codes: P1630 (Theft deterrent lean mode active), U1000 (Loss of Serial communication for class 2), U10088 (Loss of SirSDM communications), B2707 (Gearshift unlock circuit low), B2960 (Passlock cylinder data incorrent).		 7
2002 GMC Yukon 6.0L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, MIL Lamp on
Thank you for all of the replies. Our problem turned out to be the alternator, which must have gotten shorted during the big splash. We found if we unplugged it, the live data readings settled down to plausible figures and communication with the scan tool wa... Trouble codes: P0300 (Random misfire).		 9
2000 Oldsmobile Alero 2.4L Theftloc 2
reprogrammed bmc to learn data from the new sensor. worked fine cranked up and ran 30 times in a row never hiccupped once. owner drove for one day now it is on its way back with a no start (Crank then cut off)		 19
2002 Pontiac Aztek 3.4L 1-2 shift
WELL I FINALLY GOT AROUND TO TAKEN THIS TRANS APART. AS I SAID EARLIER THIS IS MY CAR THAT I BOUGHT FROM A CUSTOMER. I WANTED TO BE AS INFORMED AS POSSIBLE BEFORE I GOT IN THIS ONE. I HAD CODES SETTING BEFORE I STARTED IN ON THIS THING. THEY WERE P0730 FOR I...		 3
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