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Prev Professional Automotive Repair Technical Discussions for January 23, 2014
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Open Help Requests for GM
Help Request Answers
2004 Buick Rendezvous Ultra 3.6L Complete system VIN: 3G5DB03764
I know you guys are going to want more info on this one but I just wanted to start this to give me and idea where to start on this one. I have never run into this problem. The customer states that mostly when driving around town, the brakes will start applying...
2006 Buick Lucerne CX 3.8L No Start, Poor Idle Quality, MIL Lamp on VIN: 1G4HP57206
Customer dropped off car with this information. Car would not start in a parking lot at 10-20 below zero. It tried to run, but ran like it was missfiring; loosing cylinders. Plus customer noted abundance of black smoke from tail pipe. Towed to his home, and pu... Trouble codes: P0068
1997 Chevrolet T6500 F6B042 6.6L Engine VIN: 1GBG6H1J8V
This is my shops tow truck and will not idle smooth. Black smoke pours out of the exhaust at idle but going down the road it clears up.. I do not know much about the cat 6.6 l if anyone can give me sum direction i would love to hear from you... I small detail ...
2000 Chevrolet S10 2.2L No Start VIN: 1GCCS1448Y
I posted this problem a while back but it warmed up and never did it agian. Now its winter time. When this truck gets below 40 degrees we have no spark and no injecotr pulse. We have good crank sig. Right at the sensor but nothing showing on the scan tool. We ...
2002 Chevrolet Venture LS 3.4L No Start VIN: 1GNDX03E72
Vehicle has compression across the board, fuel pressure is within specs has nice bright blue spark(jumps 1/4 inch gap and brightly illuminates a spark tester)the problem is no injector pulse. To my knowledge on this vehicle the PCM will use camshaft senor as p...
2006 Chevrolet Colorado LT 2.8L MIL Lamp on VIN: 1GCCS19886
Hello, to all those who may have an idea on this one. Car came in running fine with one(and only one) code, P0017. Clear the code at it comes back immediately. Took the solenoid out and check the screens, they are clean. Hooked up the Tech II, the cam counter ... Trouble codes: P0017 (CKP - CMP Cam - Crank Correlation)
2008 Chevrolet Trailblazer LT 4.2L engine VIN: 1GNDT13S08
New customer is in with his Trailblazer that has a rough idle and stalls. Looked through fault memory and found no faults stored in the engine computer. Under the hood we found a K&N cold air intake setup, we disconnected mass air to see if it was soiled from ...
2010 Chevrolet Impala LT 3.5L rack and pinion VIN: 2G1WB5EK4A
Car came in with rack and pinion input seal blown and p/s pump whining. Replaced rack,p/s pump and both p/s hoses as they were leaking.Return line was crimped so it was though to be the reason rack seal blew. One week later car was back with input seal blown a...
2007 GMC Acadia SLT 3.6L parking assist , fuses VIN: 1GKEV33717
Got this vehicle from a body shop after a rear end hit. It happens to belong to a neighbor of mine to boot. Car was hit from behind by a snow plow with little apparent damage. Appears hitch prevented more damage. The shop replace one backup sensor that had be...
2008 GMC Yukon Denali 6.2L Park Lights VIN: 1GKFK63808
Hi guys. If I jump the relay, the lights come on. No power to terminal 30 of the relay which should have constant power. My Mitchell wiring diagram shows different terminal positions from the actual relay. Anyone have problems with these fuse boxes ? Hard to t...
1986 Pontiac Fiero SE 2.8L cooling system VIN: 1G2PF3799G
this car is evil. came in for overheat condition. cust had just purchased veh, drove home and parked it. next day he noticed it overheating. we got the veh and were checking it out for the overheat. found bad connector at the coolant temp sensor for the gauge,...
2004 Pontiac Grand Prix GT2 3.8L Surge, Poor Fuel Economy VIN: 2G2WS54284
This is my wife's car, we have owned it since 82,000 miles. It now has 263,000 and has always been maintained properly with OEM components. While driving in drive or overdrive at a steady speed the converter locks and unlocks rhythmically... Its driving me nut...

Fixes & Summaries for GM
Fix/Summary Answers
2009 Buick Lucerne CX 3.9L No Start, Hesitation, Cuts out, Stall VIN: 1G4HP57M79
Thxs to all who replied checked cam/crank sensor both checked out good so we gave the vehicle back to customer and told them to bring it back when it gets worse next day gets towed in with no start checked it out now fuel pressure pulled rear seat up and check...
1989 Chevrolet R1500 Suburban Scottsdale 5.7L Cuts out, MIL Lamp on VIN: 1GNER16K0K
After putting nearly 100 miles on this old Sub. it has not reset code 42, and as I stated in my update about o2 voltage dropping out, that has not happened again either. What I did: Inspected all wiring (removed conduit, etc.) from underhood to ECM, manipulat... Trouble codes: 42 (Electronic spark control).
1993 Chevrolet Cavalier RS 2.2L No Start, Hesitation, Surge, Cuts out, Stall, Misfire
I ended up replacing the coils along with the ICM and the car does not miss a beat now, I drove it about 25miles with no issues thanks everyone who helped out!!
2000 Chevrolet K3500 5.7L No Start VIN: 1GBJK34R1Y
Thank you all for your responses. After doing a wiggle test on the OBD II connector wiring it started to work, but showed no codes on PCM. We tried a fuel pump, due to a friend who mentioned he had had seen good fuel pressure before and the truck he worked o...
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