GM Automotive Technicians Technical Discussion and Fixes for Feb 24, 2006

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Open Help Requests for GM

	Help Request	Answers
	1998 Buick Century Custom 3.1L water in oil Hello all, this vehicle came in last month with water in oil, bottom end wiped out. replaced engine with low mileage bone yard unit. replacement engine was very clean, oil was noticably used but not filthy. well now its back, customer has put less than 500 mil...	View
	2003 Buick Rendezvous CX 3.4L Rear Differential VIN: 3G5DB03E73 Greetings GM techs. This Rendezvous came in with a loud howl and vibration in the drivetrain that varied in intensity with speed and load. When running the vehicle on the hoist we narrowed down the noise to the rear differential area. We have removed the rear ...	View
	1967 Cadillac SEDAN DEVILL 429CID front shoe/drum Howdy ever body, and especially you oldtimers out there... Got this antique thats stressin me out. Came in for a complete assessment, one problem being unresponsive/pulling brakes. We completely rebuilt the brake system, now response is good but it has a minor...	View
	1999 Cadillac Catera 3.0L MIL Lamp on VIN: W06VR52RXX VEHICLE CAME IN WITH THE CHECK ENGINE LIGHT, ABS, & TRACTION CONTROL LIGHT ON. THE SPEEDOMETER ALSO DOES NOT FUNCTION. WE COULD NOT RETRIEVE TRACTION CONTROL OR ABS CODES, BUT THE FOLLOWING CODES WERE RETREIVED FROM ECM, U2108-CAN BUS ERROR ABS, P1700-TRANS. F... Trouble codes: U2108 (can bus error abs), P1700 (transmission fault has occured), P0500	View
	2000 Cadillac Catera 3.0L MIL Lamp on VIN: W06VR54R5Y We now have a Po171 and P0174 codes in this car, Vehicle runs great, no missfire or anything.We checked for vacuum leaks cannot find any at all. We did find loose clamps on the intake air hoses after the maf tightened them up but still has these code return. T...	View
	2001 Cadillac Catera 3.0L Cooling Systems VIN: W06VR54R71 Customer just bought this vehicle and brought it in for an oil change. The oil fill cap was all gunked up like a bad head gasket. The vehicle never overheats, runs perfect and has no other signs of a bad headgasket. We performed a head gasket test, and the res...	View
	1989 Chevrolet C3500 Cheyenne 7.4L Poor Idle Quality VIN: 1GCGC34N6K unit was brought in day before for knocking, 3 quarts of oil were added brought back today for assesment of oil loss. Rear main is leaking, Noticed Engine Idle at 1400 rpm and wont settle down, Check for vacuum leaks and found everything in place and ok. Scan ...	View
	1993 Chevrolet Camaro Indianapolis 500 Pace Car 5.7L No Start, Cuts out, Stall VIN: 2G1FP22P0P Car came in on hook no start code 42 replaced ign. module for code 42 fixed 42 and 41 popped up .ran gm trouble tree for code 41 all checked ok and it said to replace ecm .ran pre ecm replacement chart all power & grnds ck ok.,KOEO all gnds 45-55 mv.replaced e... Trouble codes: 41 (est shorted or open), 42 (ign module replaced and cleared 42 but but 41 popped up)	View
	1994 Chevrolet Astro CL 4.3L Poor Idle Quality, Misfire VIN: 1GNDM19W8R HELLO GUYS, I have a bit of a promblem. Van was at gm dealership, for rough run. They cleaned out intake manifold and egr valve circuit. Cleaned injection system and check fuel pressure reg for leaking. Customer got my name from a freind and brought vehicle to...	View
	1996 Chevrolet Caprice Classic 5.7L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2B1B684P1T help! car runs great until closed loop, as soon as this happens right bank run rich imediately. fouls out plugs in seconds not with raw fuel just black, loads up o2 sensors with soot to the point of plugging them up. i have put in 4 sets of plugss and 2 sets o... Trouble codes: 300 (multiple miss fire), P0154 (insufficient activity b2 s1), P1653 (oil level light circuit)	View
	1997 Chevrolet Venture LS 3.4L No Start VIN: 1GNDX03E8V Vehicle was towed in and had a crank no start. Fuel pump would not run. Started checking fuses and found #33 ECM sense fuse was blown. Replace the fuse and it blew again forty miles later and the fault code P1655 appears a while after the fuse is replace. A fr... Trouble codes: P1655 (Evap purge solenoid circuit.)	View
	1998 Chevrolet Corvette 5.7L traction control VIN: 1G1YY22G4W i get a code c1277 from the chassis side with a mastertech scan tool. the code description for c1277 is required torque signal circuit malfunction. the pcm sends 5 volts on circuit 463 to the ebtcm(electronic brake traction control module) which grounds the 5 ...	View
	1999 Chevrolet Tahoe LS 5.7L p/s pump VIN: 1GNEK13R7X The power steering pump went out. it was so hot it melted the dip stick. REPLACED the pump and it worked fine for 10 miles then it went out. I had it replaced and it went out also. the third one was put on and I then had the high pressure hose replaced. it sta...	View
	2003 Chevrolet Cavalier 2.2L speedometer VIN: 1G1JC52FX3 Thanks in advance for any help, I have this Cavalier that when it came in the speedometer was pointed straight down and wouldn't even try to work, testing from mitchell shows to replace the insturment panel cluster, my question is has anyone else seen this on ...	View
	1995 Oldsmobile Cutlass Supreme 3.1L Cooling Systems VIN: 1G3WH52M35 I can't seem to get the air out of the cooling system on this vehicle. I changed the thermostat and flushed the coolant on this vehicle. There had been no previous cooling system issues. I ran the vehicle the night before repairs with the cooling system flush ...	View
	1997 Oldsmobile Achieva S 2.4L my sanity VIN: 1G3NL52T9V The problem is going over bumps there is rattle coming from the right front wheel area of car. As stated above I disconnected sway bar and then test drove. Rattle still there. I replaced right front strut mount and both front struts. Noise still there. Yo...	View
	1998 Oldsmobile Bravada 4.3L airbag VIN: 1GHDT13W6W hey,any help on this would be great. car came in for air bag light pulled codes found b1025,b1026,1036,history codes &b1053 current code. found dk green wire from sdm to clockspring intermittent short (rubed on brake pedal) and clockspring shorted. b1025,b1026...	View
	1994 Pontiac Firebird 3.4L No Start VIN: 2G2FS22S4R Hi all. I've got one here that has me ready to pull out what hair I have left. This vehicle was towed in. It will once in a great while start and run like crap. The injector pulse will go back and forth from 9 to 30. All sensors are with in limits. It always h... Trouble codes: 82 (3x signal error)	View
	2000 Saturn LS2 3.0L MIL Lamp on VIN: 1G8JW52R2Y This car is the same as a Cadillac Catera (ble) with a Saturn label... Intermittently, this vehicle's speedometer will stop working & the MIL will illuminate with DTC P1780 stored. This has happened three times in the past six weeks. The car runs/shifts/drive... Trouble codes: P1780 (ECM not sending required information to TCM)	View
	2006 Saturn Ion Red Line 2.0L Super Charger Oil VIN: 1G8AY11PX6 Hello techs. I have a question concerning the oil for the super charger on this Saturn. All of the GM vehicles with super chargers I've worked on took 5 W 30 synthetic oil up to the plug for the blower oil sump. This car had no oil even reaching in with a pipe...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1993 Buick LeSabre Custom 3.8L Poor Idle Quality, Hesitation, Surge VIN: 1G4HR53LOP This Buick is still driving us nuts. We have smoked the system for vacuum leaks and even replaced lower manifold gasket. The fuel pressure is 37p.s.i. and the volume is over 1 pint in 8 seconds.We have replaced the MAF and substituted a known good ECM,tested a...	30
	1995 Buick LeSabre Limited 3.8L fuel gauge VIN: 1G4HR52L2S Thank you to those who replied I went ahead and gambled and tried another sending unit and it fixed my problem it must have just been a defective part but I still don't understand why it would work outside of the tank but not inside.	11
	1997 Buick LeSabre Custom 3.8L axle shaft seal leak VIN: 1G4HP52K7V This vehicle is fixed. Many thanks for all the responses, with special thanks to the guys who mentioned the aftermarket seal/brg assembly. I compared output shaft play with other transmissions, and it was comparable, yet this one leaked. Upon ordering and inst...	24
	1998 Cadillac DeVille Concours 4.6L Rear suspension VIN: 1G6KF5490W Out of the 3 responses I received, one suggested tires which he has had replaced, one asked if there was a tie rod problem which I could understand would cause this condition but is not the case with this vehicle. The last reply from Harold out of Virginia off...	4
	2003 Cadillac DeVille 4.6L MIL Lamp on, Check Gas Cap Messag VIN: 1G6KD54Y43 Hey everyone, we did not get a chance to see this to the finish before we need to close this out.From the messages we received we felt that the best thing to do would be to replace the vent valve. We did that and the customer has taken the vehicle and the 'che... Trouble codes: P0440 (Emission System Fault Large Leak).	11
	1991 Chevrolet S10 Blazer Tahoe 4.3L Cooling Systems VIN: 1GNDT13Z7M well this is the last time i try to help another tech at our sister shop over the phone, it turned out being a head gasket which over the phone at first he told me he checked for a head gasket. so thankyou all for your replies and help.	27
	1994 Chevrolet Corsica 3.1L No Start VIN: 1G1LD55M3R Still no luck on this one .Can't afford to spend much time on it.Purchased a new injector tester but all still tested good.Switched ecm into another car ran fine.I am really tired of being asked about this one from my customers. Trouble codes: 36 (crank sensor), 80 (trans error).	21
	1994 Chevrolet P30 7.4L downshifts alone VIN: 1GBJP37N7R Hi everyone, you guys sure came up with a mix of possible causes to the problem. The first thing we did was to remove the pan; the inside was clean, the fluid clean. The filter and fluid was changed. Next the radiator was removed, checking it with an infra red...	8
	1999 Chevrolet Monte Carlo LS 3.1L heater VIN: 2G1WW12M6X Thanks for all of the replies, but customer is deciding on whether or not to cut his losses here and now. In any event, the consensus on the problem is most likely the head gasket(s). I will be reposting if vehicle returns. Once again, thank you for your valua...	21
	2001 Chevrolet Blazer LS 4.3L alternator VIN: 1GNCT18W41 i drove this car home the next day after my posting and no symptoms returned. the day after that the abs light came on every time i started it .most of the replies (six in all)told me to look for a bad ground. so i spent three hours checking ground and doing v...	7
	2004 Chevrolet Silverado 1500 5.3L driver information center VIN: 2GTEC19T93 Hi gang-Thanks for the responses, they all said to reprogram the IPC. I was a little gun shy on doing this because in the TIS calibration selections there was nothing to address an inoperative DIC. There was only one selection useable and it was described as '...	9
	1996 Geo Tracker 1.6L MIL Lamp on VIN: 2CNBE1860T I thought that I had found the problem, but now I am not sure. After further scanning the archives, I found this problem being caused by cracked exhaust manifolds on other brands. I thought that I could hear an exhuast leak, so I removed the heat shield on... Trouble codes: P0171.	6
	1997 GMC Savana 2500 5.7L Hesitation, Cuts out, Stall VIN: 1GTFG25RXV Thanks again to all who replied. For one I tried a different fuel pressure gauge, and noted that now the fuel pressure was withing specs. 64 psi @ idle. Knowing the the maf, map sensors, and the ignition system were working properly, the VCM became the focus o...	8
	1990 Oldsmobile Delta 88 Royale 3.8L Stall, MIL Lamp on VIN: 1GH3N54C6L Hi Guys, This customer hasn't returned since we informed him of the missing magnet on the timing gear. We didn't have the chance to finish tracing down the problem of the brakes killing the engine. Thanks to everyone, I really appreciate it. If he returns ... Trouble codes: 41 (Cam sensor).	21
	2003 Oldsmobile Alero GL 2.2L ignition or antitheft system VIN: 1G3NL12F63 Thanks to all five of you who replied. After the customer had spent his money on fuelpumps and cranksensors, I felt pretty confident we were on the right track. Thanks for firming up my suspicions! Nice day in Missouri.	9
	1995 Pontiac Grand Am SE 2.3L over heating VIN: 1G2NE52TXS thank you for all the help it was a slightly cloged heater core we flushed the rust out of it and it stoped over heating	23

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