GM Automotive Technicians Technical Discussion and Fixes for Jan 6, 2005

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Open Help Requests for GM

	Help Request	Answers
	1990 Cadillac DeVille 4.5L ignition VIN: 1G6CD5337L hello everyone.got this 90 caddy that cranks when it wants to ,but dont always want to.when it first came in i went in the column to check wires for security to see if they were scuffed and they were one was broken.so i replaced the cyl.and key cranked fine af...	View
	2004 Cadillac CTS 3.6L tire wear VIN: 1G6DM57754 are these cars prone to wearing outer edges of the front tires at such low milage? toe was out of spec alittle bit.	View
	1969 Chevrolet stingray 350CID heater core VIN: 194679S114 Hello all, I have this 69 vett. that needs a heater core and my repair dvds only go back to 1983. if any one has removel info on cd or dvd to e-mail me It will be most appreciated. Thanks to all.	View
	1992 Chevrolet G30 Sportvan 5.7L Poor Idle Quality VIN: 2GAG639K2N This van is a puzzle, we have no data at MT2500 scanner. We can check each sensor with the vantage and find all readings ok with the exception of a flat line at the O2. It runs rough and when you accelerate it has a valve ping like it's out of timing. We tried...	View
	1994 Chevrolet Lumina 3.4L Unknown Problem: After it rains, water collects under the driver side floor mat.The center of the water seeems to be in the middle of the floor pan, and some wetness is located to the left side of the brake pedal adjacent to the Emergency Brake Foot pedal. When the ca...	View
	1995 Chevrolet C3500 Cheyenne 6.5L engine VIN: 1GBKC34FOS This truckhas a knocking noise at all times. It is a deep low noise, like lower end. truck runs good, no smoke noise is loudest at decel. I can crack injector lines, but can't make noise stop. the noise started after the engine lost a head gasket, hydro-locked...	View
	1995 Chevrolet Camaro Z28 5.7L Security Ignition System My Fellow Techs, I need help with a personal project of mine. I'm working on a 1970 chev. pickup. I installed the engine from a 95 camaro and I also installed the ECM. I'm having a no start problem. The camaro had the ignition with the security chip on the key...	View
	1997 Chevrolet K1500 5.7L No Start, MIL Lamp on Vehicle will not start. No spark. Not sure if related to DTC P1345. Looking for a magic fix from you GM guys out there. Are these trucks bad for coil or ignition modules??? Trouble codes: P1345 (CKP/CMP correlation)	View
	1999 Chevrolet Blazer 4.3L 2-3 shift solenoid VIN: 1GNCS13W2X This vehicle will act as though it has dropped into neutral if you let off the throttle slightly during hard acceleration. It does this repeatably. It has come to us from a reputable tranny shop who believes the problem to be electrical. They have already repl...	View
	1999 Chevrolet Astro 4.3L Fuel Gauge VIN: 1GCDM19W4X Fellow Techs, need a hand with this. Gas gauge intermittently messes up. When it does, it goes round and round just like a second hand on a clock would, only about 3 to 4 times the speed of a second hand. The normal range of this gauge is from empty, about 10:...	View
	2000 Chevrolet Silverado 1500 4.8L Unknown VIN: 1CGEK14V7Y Hi fellow techs, This problem is a little hard to describe but here goes. After coming to a complete stop, when you let off the brake and hit the gas you get a slight jerk that almost feels like the driveshaft spline is moving in and out or the axle is wound u...	View
	2002 Chevrolet Trailblazer LS 4.2L Lower Ball Joint VIN: 1GNDS13SO2 I have a noise in this vehicle. I think the lower ball joint is knocking, it has more slack than I like. The ball joint looks a little different. The manual says I need to kind of form the new joint after it is installed. There is a thin tin cover on the upper...	View
	2002 Chevrolet Trailblazer LS 4.2L Poor Idle Quality VIN: 1GNDS13S53 Sure could use little help on this one...motor runs great until a/c is turned on...then it surges very erratically and sometimes dies. no dtc's in ecm. noted what appears to be no vacuum at fuel pressure regulator. customer will drop it off in the morning and ...	View
	2003 Chevrolet Silverado 3500 LS 6.6L Cuts out VIN: 1GBJK39183 This Truck Came in thi morning it will not run faster than 40MPH.It has A list of DTCS All witch seam to be communication problems. I have Checked All Fuses.I dont know where to go next.After reading alldata the system seams to do a test to these controlers an... Trouble codes: U1024 (u1041-), U1041 (u1800-), U1800 (u0089-), U0089 (u0087-), U0087 (Po700-), P0700	View
	2003 Chevrolet Silverado 3500 6.6L Guages VIN: 1GBJC34123 We have these two identical fleet trucks with the same problem. First of all this one truck came in with a speedo needle buried all the way over past 120 MPH. We reset by hand and it went right back over. I sent the cluster to the dealer to be rebuilt. That to...	View
	1991 GMC S15 Jimmy 4.3L No Start, Poor Idle Quality, Cuts out, Stall VIN: 1GKCS18Z6M The truck came in with stalling/idling problems. Scanned system, no codes found. Check fuel pressure, and found it at 12PSI (normal range). At the same time, found fuel pressure was bleeding off within seconds. Determined fuel was bleeding off into TBI, hence ...	View
	2000 GMC K2500 Sierra SL 5.7L Fuel gauge VIN: 1GTGK23R3Y Hi all. I have this GMC here, and the fuel gauge reads the correct amount of fuel, but the needle vibrates back and forth very quickly, you almost get dizzy staring at it. I have changed out the fuel pump module, but to no avail. Just wondering as to waht my n...	View
	1993 Oldsmobile Cutlass Supreme S 3.4L rear brake pressure VIN: 1G3WT34X4P Although our customer has agreed to the process of elimination, this is out of hand. We have called oldsmobile, chevy, etc. for help, they seem unhelpful. Intake manifold gasket has been replaced at oldsmobile 1-3 yrs. ago, problem was present before & after t...	View
	1994 Oldsmobile 98 Regency Elite 3.8L info. center VIN: 1G3CW52L1R hello everyone. i have a 1994 olds 98,after starting vehicle the information center flashes,oil level system problem,then cooling level system problem. we ck'ed computer system,oil psi. is good,and no oil light,oil level is full.cooling system temp. is good,g...	View
	2001 Pontiac Grand Prix GT 3.8L Mechanical VIN: 1G2WP52K01 This car seems to have a vibration in the engine between 1,100 and 1,300 rpm's in neutral or drive. It feels like a misfire however it sets no codes. All the scan data looks good except the long term fuel trim is minus 19 short term bounces up and down a littl...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Buick Park Avenue 3.8L Battery VIN: 1G4CW52L7R It turned out to be the radio and the customer's son is going to bring me a new radio for the car. Thanks for all the help. I thought the clock staying on was funny but normally nothing can be that simple.	27
	1994 Cadillac DeVille 4.9L service engine soon lamp fix-send i/p cluster to gm and for a mere 350.00 my cost i got a new one-all for a burned out 5 cent bulb.	4
	1989 Chevrolet Camaro Iroc-Z 5.7L poor idle VIN: 1G1FOP218O Well Thanks to all who wrote to reply.Turns out most everybody was on the money.There was a restiction in the return line.We disconnected the return line and forced air threw it took awhile to get back to the tank but it finally did and the pressure dropped li...	11
	1992 Chevrolet G30 Chevy Van 7.4L Surge, Cuts out, Misfire VIN: 1GBKP37N3N The ecm was not increasing the pulse width enough. We replace the ecm, witch took care of most of the problem. We also found a over senstive knock sensor.	5
	1996 Chevrolet Cavalier 2.2L amp light on VIN: 3G1JC1243T Thanks to every who helped. Jim was right on. I did some testing and found a broken wire at the field terminal.	8
	1996 Chevrolet Cavalier LS 2.4L poor idle VIN: 1G1JF52T2T Hello everyone and thanks for the help on this one. The fix ended up being a slightly leaking fuel pressure regulator. We took some advice to use a vacuum pump and pump the diaphragm up for a couple minutes and then check for fuel in the line. We had some od...	8
	1997 Chevrolet Corvette 5.7L no acel VIN: 1G1YY22G2V thanks! IATN TECHNICIANS we replaced the throttle sensor now la corvette runs as good as new. Trouble codes: P1221 (tp sensor 1 and 2 performance), P1515 (command vs actual tp performance pcm), P1516 (command vs actual tp performance tac).	1
	1998 Chevrolet S10 4.3L warning lights VIN: 1GCCS14X4W Thanks for the 3 replies. I went under the dash and wiggled and moved all the wiring harnesses around. The more I wiggled the more lights went out. In the end they all went out. This is not a great fix but it worked. Maybe the truck had been in water and the c...	3
	2001 Chevrolet Impala 3.4L Radio VIN: 2G1WF52E71 Not actually a fix but a summary of 'no sound'. Thanks to David [...] for taking the time to explain how these radios work. Took everyones suggestions, to disconnet battery cables and cross for 15 to 20 seconds to testing the powers and grounds again. Ohmed th...	5
	1992 GMC G3500 Rally 5.7L No Start VIN: 2GTGG35K1N ignition module and pick up fixed not shure but believe cranking signal to low from pick up	12
	2002 GMC Yukon SLE 5.3L Excessive lash in pinion VIN: 1GKEC13Z02 Thanks for everyone who replied!..I havent had the chance to perform any of the sevices recommended to me yet,but I am confident that my problem will be solved.The majority of replies appear to cover 2 areas.1 is removing drive shaft,and applying a special gre...	9
	1999 Saturn SC2 1.9L No Start VIN: 1G8ZH127XX Well fellow techs, I did not fix this vehicle. I did follow through with the tsb on this , but did not find any problem. I put it all back together and the vehecle started! It has been gone now for 2 weeks and not been back. I feel that this vehicle had a bad ...	10

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