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Prev Professional Automotive Repair Technical Discussions for July 5, 2011
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Open Help Requests for GM
Help Request Answers
1995 Cadillac Eldorado 4.6L Poor Idle Quality, Surge, Cuts out, Stall, Hard start VIN: 1G6EL12YXS
Any help or direction would be greatly appreciated. I have a 1995 cadillac eldorado that has a hard time starting when cold and has a severe rolling idle when warm, but not all the time. I retrieved the above mention codes, documented them and cleared since th... Trouble codes: 23 (Ignition control ckt problem), 32 (Map sensor fault), 36 (Egr fault), 53 (4x ref. Sig interrupt from ign. Module), 91 (Pcm keep alive memory), 95 (Engine stall)
2005 Cadillac SRX 3.6L onstar VIN: 1GYEE63755
The srx came in for another trouble, after clearing trouble code, a code u1500 (interdevice bus malfunction) appeared, by the radio we hear "phone unavailable" and a red led is lighted on the mirror. The subscription for the onstar was never renewed and before...
1990 Chevrolet C1500 Silverado 5.7L No Start, Stall VIN: 2GTEC14K5L
I have an old TBI system on a 5.7 that is giving me trouble. At first it was towed in as a no start and the customer wanted a fuel pump put in. Did that and it still stalls now intermittently. It is very random when it does act up and some times it will restar...
1997 Chevrolet S10 4.3L No Start, Cuts out VIN: 1GCCS19X2V
ECM Fuse Blowing Runs for 12 Seconds and then fuse blows. Replace fuse then runs for 20 feet then blows I need a wiring diagram for this vehicle.
1999 Chevrolet K1500 Suburban 5.7L hard shift when warm VIN: 1GNFK16R3X
When pulling my 17ft boat on a hot day on flat ground, after about an hours drive the transmission start to shift hard, with a clunk, when i stop for half an hour is goes away and only does it on days warmer than 80 degree's. I assume this is 'HEAT RELATED'?? ...
1999 Chevrolet S10 4.3L No Start VIN: 1GNDT13WOX
Hi we had a 1999 chevy s10 towed into shop a few weeks ago. The customer was driving and car shut off and would not restart. When it got to shop car started fine. We found crank sensor code po339. We changed cam and crank sensor at that time. Car was towed in ... Trouble codes: P0336, P0339
2002 Chevrolet Express 3500 5.7L eNGINE VIN: 1GAHG39R72
Hi everyone, help me out please! This 2002 van is one in a fleet that I do regular service on for an after school program. This particular van has had a complete engine rebuild within 500 miles. When it arrived at the shop this time the complaint was that with...
2004 Chevrolet Silverado 3500 6.6L MIL Lamp on VIN: 1GBJC34274
their is inconsistent imformation regarding is, or what is not allowable specifictions . fuel ramping of desired and actual fuel preassure on tech 2 indicates fprv ok ? Trouble codes: P1093
1998 GMC K1500 Sierra SLE 5.7L airbag VIN: 2GTEK19R9W
vehicle came in with airbag light on scanned system no codes present or history for airbag..scan data and get lamp control -on, lamp on time 0:00hrs, cycles - 7.0, do i have a bad module??? anybody been down this road???
2000 GMC Sonoma SL 2.2L Clutch Problem VIN: 1GTCS1459Y
I have a 2000 GMC Sonoma that I am having a heck of a time figuring out a problem in the hydraulic clutch system. The vehicle originally came in with a clutch failure with the disc worn to the rivets. I replaced the disc, pressure plate, release bearing and pi...
2005 GMC Sierra 2500 HD SLE 6.0L continues to run VIN: 1GTHK24U35
I'm hoping someone has seen this before considering this is kind of an odd problem. Mice had made a nest under the fuse block under the hood. They ate most of the engine harness wires. One day the customer walked by the truck and he could hear relays clicking ...
2005 Pontiac Montana 3.4L No Start, Cuts out VIN: 1GMDV23E65
Please be patient, this is a long one. Customer stopped for a bag of bagels and vehicle would not start after numerous attempts. When AAA showed up it started and he drove to my shop. I was able to start it only after numerous attempts. The first set of codes... Trouble codes: P0128 (Tstat temp below norm), P0455 (Large evap leak), P0327 (Knock sens low input), P0520 (Op sw circ)
2003 Saturn Vue 2.2L transmission/transaxle VIN: 5GZCZ43DX3
Owner purchased this 2003 AWD VUE on the 1st of July, drove it aprox. 600 miles, heard a noise and brought in this AM with a rythmic rpm induced "rubbing noise" in "P" or "N" that quiets when shifted into any gear but manifests again at wheel related speeds. M...

Fixes & Summaries for GM
Fix/Summary Answers
2005 Cadillac CTS 3.6L Electronic VIN: 1G6DP56765
We were suspecting neutral safety switch. Which on this car is inside the trans. We spoke to a local trans shop that we deal with and this was his thought as well. He said the switch was internal and about a 2.5 hr job to change. We towed it down to him and to...
1995 Chevrolet C1500 Suburban 5.7L Serpentine VIN: 3GNEC16K6S
Well first of all thanks to all that replied. This thing got worse by the minute. There defenitely was a drag in the compressor. Turns out there was an OIL overcharge. Compressor apparently couldn't circulare refrigerant freely. Evacuate system, R&R compressor...
1997 Chevrolet K1500 Suburban 5.7L Front Unit/AC VIN: 1GNFK16R5V
Thanks to the 5 replies. I did my vacuum again and did it for about an hour this time. As it was being done I heard a popping sound. Don't know what it was but it took a full charge and works fine. al
2001 Chevrolet Silverado 2500 HD LS 6.0L Fuel tank vacuum VIN: 1GCHK24U41
Thank you to all the members who responded. I learned a lot about the EVAP system. Turns out that all of the vent and purge components were plugged with gravel road lime. Once the tank and pump were replaced and both the vent and purge valves and the charcoal ...
2003 Chevrolet Impala 3.4L Red warning light VIN: 2G1WF52E83
Thanks for the help!! David & Eric were correct the BCM was the culprit. I'd already tried to disconnect the switch from the E-brake and master cylinder and this system does not have a pressure differential switch. The key information was in talking to the cus...
2005 Chevrolet Silverado 1500 5.3L random VIN: 1GCEK19B75
Well you guys did it again! The encoder was randomly faulting.. We had some bad connections that didn't pass the wiggle tests at the module and switch so thats another reason this was so head scratching.. Thanks again, friends!
2006 Chevrolet Aveo LT 1.6L no compressor VIN: KL1TG666X6
information from all of you guys was great, i know what the fix is now, and unfortunately wont be able to do it till next week (vacation in florida for a month). the pcm is getting false information and therfor shutting down the ac system its the pressure swi...
2008 Chevrolet HHR LT 2.4L Temperature control actuator VIN: 3GNDA33P68
I got my hands on another heater control panel to test this vehicle with but have been unable to schedule the vehicle for additional repairs.
2008 Chevrolet Cobalt LS 2.2L Electronic steering VIN: 1G1AK58F08
Well we called the dealer and they told us it went out of warranty in april so my used car dealer opted to get a used one(i hate used parts but who am i to say anything).Put in the used one this morning and BAM all is fine again with steering and no programmin...
1995 Oldsmobile Cutlass Ciera 3.1L Hesitation, Misfire, MIL Lamp on VIN: 1G3AJ53M3S
Ok folks, I am closing this post because I have, according to the customer, fixed the concern. I have no idea what I did but the customer decided to take the car for the weekend rather than have it sit on our lot. She called this morning and thanked us for tak... Trouble codes: P1403, P1640.
2005 Pontiac Bonneville SLE 3.8L instrument cluster,hvac VIN: 1G2HY54K55
Thanks to all that tried to help,, Problem was a control unit pulling communication line down, Eventually traced to the DIM or dash intigration module, Otherwise known as BCM on most cars, Pulled modules out of circuit one at a time untill could not reprodu...
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