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Open Help Requests for GM
Help Request Answers
1990 Cadillac DeVille 4.5L blower
vehicle has no ac information, or fuel info. no lites. cant access trouble codes from ac controls. all fuses are good. power to ac module at red wire . no power at purple, has good ground on black to module. when calling ask for michael please. thank you.,		 View
1997 Cadillac Catera 3.0L high beam indicator/interior lighting
High beam indicator&interior lighting works intermittently.can tap on dash to cause fault to correct.		 View
2000 Cadillac DeVille 4.6L power steering
Fellow Techs this caddy loses power steering once in a great while, from what I have been told cust drives 6o miles & when she gets to her destination & attempts to park or make slow turning manuvers very hard to steer.We have driven 150 miles & no prob. Have ...		 View
1995 Chevrolet Astro 4.3L No Start, Stall
This van came in about 2 weeks age with rough idle. Found bad egr valve and replaced. Van idle fine and ran great. came back yesterday with problem going dowm the road and cutting off and wouild not start until it set awhile. So I hooked up the scanner and gav...		 View
1995 Chevrolet Caprice 5.7L poping sound
Hi Guys.Have a problem with this impala ss.I runs good but when you give it gas hard it popes out of the intake,but when you give it gas not too fast it is fine.It has a new cap and rotor,wires,and plugs look like new.at ilde the tps is .66,the iac is 0,the ai...		 View
1997 Chevrolet Camaro 3.8L P/S pump
I replaced the p/s pump (cardome) and pressure hose due to it leaking. Three months later car comes back because steering wheel is hard to turn at idle, but if you rev up the engine the steering wheel gets easier to turn. Thinking the P/S pump was bad I ordere...		 View
1998 Chevrolet Lumina 3.1L compressor
Has anybody out there found an economical way to repair the compressor seals where the the 2 halves of the compressor join; OEM does not sell that big seal, does it have to be a complete new compressor everytime; Thanks in advance everybody.		 View
1998 Chevrolet Van 5.7L No Start, Stall
Trying to help a friend. Have limited exposure to American cars. Van will start when cold. After it warms up, if I shut it off it will not restart. Plugs are firing and I can hear fuel pump running. Owner also said that if he started car cold and drove away ca...		 View
2000 Chevrolet Silverado 4.3L Hesitation
I need some help. THis truck came in comlaing of losing power. Fuel pressure is at 60 psi. O2 are reading around 30 mv @ idle and fuel trim is 190. If I unplug the maf the the o2 read around 800 mv and fuel trim run around 128. I have replaced the maf twice no... Trouble codes: p0171 (o2 lean bank 1), p0174 (o2 lean bank 2).		 View
2005 Chevrolet Silverado 4.8L compressor clutch
hi all this is one of our fleet trucks and the ac clutch will not enguage. the pressures are good and if i jump the ac relay the clutch enguages and the ac is cold. pulled all the data from the mt2500 and all looks good except the low coolant pid says yes. the...		 View
2006 Chevrolet Silverado 6.0L shifting
Help GM Wiring Wizards! This is what I got. My personal truck, '01 Silverado 2500HD, 6.0 with 4L80E. Cooked the tranny. Really want to update tranny to the new 6L80E 6speed. Is there any way to hook into my harness to operate? I don't mind rigging some type o...		 View
2002 GMC Envoy 4.2L Poor Idle Quality
Okay guys this vehicle is a major headbanger. The customers complaint is that sometimes on acceleration it feels like you turned the key of and then back on. Also it vibrates at idle, which causes a buzzing noise inside the vehicle. You can feel it in the stee...		 View
2005 GMC Envoy XL 5.3L MIL Lamp on
vehicle came in with mil on.hooked snap-on modis to it,and it tells me no communication.installed update,and still no communication.has anybody run into this,or do i have to ship them to the dealer?thank for any ideas!		 View
1995 Pontiac Grand Am 3.1L No Start
VEHICLE HAS A CRANKING NO START WHEN COLD. EVEN WHEN 80º OUTSIDE OR PARKED IN SHOP OVERNIGHT IT WILL NOT FIRE UNLESS WE SPRAY ETHER INTO THE INTAKE. AS SOON AS ETHER IS SPRAYED INTO INTAKE IT STARTS IMMEDIATELY AND WILL RESTART EVERY TIME. ONLY AFTER SITTING F...		 View
2002 Saturn SL1 1.9L No Start, MIL Lamp on
OK guys, this one has me baffled. I did get the car running which is the baffling part. Now we have only seen this car this time after Saturn of Manchester looked at it for this issue. My first suspect item was the crank sensor, so I yanked it out and started ... Trouble codes: p1599 (CC power management mode or engine stall), p1620 (low coolant cicuit).		 View

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Roadmaster 5.7L engine
thanks for all the help , did not receive any tips that had not been tried already ,ended up disableiny the water pump and running engine ,watching for bubbles would get 1 quarter size bubble every 15-18 seconds ,possible combustion leak ,head gasket ? just st...		 33
1999 Buick Regal 3.8L abs light
Well, the car went to auction as the dealer did not want to spend any more time or money on this one. Possibly if I had access to a Tech 2 I may have had a code. Many replies about ignition switch problems with these cars, but a new one did not solve this pr...		 19
1996 Chevrolet Pickup 5.7L Hesitation
first i want to thank all who responded to my request. i took all responces into consideration and started with addressing the fuel pressure. I am used to this type of system not running if there is not 60 psi and that should of threw up a red flag of only h...		 22
2000 Chevrolet Pickup 7.4L Fuel Gauge
A special thanks to ALEX as it turns out after going through every test every one suggested it turns the calibration for the pcm was for one tank and not two. I had the dealer reflash it and now it is fine. At least I really understand how this system works.		 9
2001 Chevrolet Prizm 1.8L cooling fans
This one is fixed, with little fanfare. It's amazing how easy it is to fix cars with the right information. Had a couple offers to fax me wiring schematics and a friend of mine did. With a good schematic I found out that both my fuses are supplied power wit...		 6
1990 GMC Vandura 4.3L engine
This was an interesting one. Had three good replies, one for valve guide or spring, the other 2 for piston slap, loose piston pin or rings hitting too high. We did remove the valve springs and check guides and valve movement – all good. Pulled the engine down ...		 6
1991 Oldsmobile Ninety-Eight 3.8L MIL Lamp on
After making several wiring repairs this vehcle still set the code for the cam sensor. Replaced the PCM after verifieing that it was receiving the proper signal. This had no effect on the problem. The customer is taking it to the dealership. Trouble codes: 41 (Cam sensor circuit).		 5
1995 Oldsmobile Cutlass Ciera 3.1L Poor Idle Quality, Stall, MIL Lamp on
Let me start by explaining our problem again. This 3.1 would intermittently buck and some times die at idle. SES light would come on at times. I am going to call this one fixed. Stephen [...] suggested unplugging the alternator to see if the problem went awa... Trouble codes: P0341 (Cam position sensor).		 9
1990 Pontiac 6000 3.1L Excessive Emissions, Poor Idle Quality, Surge, Cuts out, Stall, Poor Fuel Economy
High all, thanks for all your input, couldn't get permission from customer to pull the intake off to get to the rest of the injectors, but the two I could get to I rechecked those at different temps, ok. I had previously checked the EGR, but it's one of those ... Trouble codes: 35 (Idle air control IAC problem), 45 (Rich exhaust), 44 (Lean exhaust).		 10
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