Prev iATN Members TechHelp for March 5, 2008
Automotive Technical Exchange for the Automotive Repair Professional		 Next
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM
Help Request Answers
1998 Buick Regal 3.8L right front
This regal has us stumped. When turning right (only right)there is a noise that sounds like a screw driver bouncing off of bicycle spokes. We replaced a bad right front hub assembly that was no help. We even swapped the right and left hubs just to see what wou...		 View
1991 Cadillac Fleetwood 4.9L ABS Braking
We Verified Customer Complaint. Car Has New Front Pads, Rotors & Rear Brake Shoes, Hold Down Springs And Self Adjusters. It Had Mutiple ABS Codes. 61 Pump Motor Test problem, 45 Left Front Solenoid Or Inlet Valve Circuit Fault, 31 Right Rear Wheel Speed Sensor...		 View
1993 Cadillac Eldorado 4.6L Poor Idle Quality, Misfire, BACKFIRE
This cadillac will intermittantly on start up backfire very badly. When it does that it will misfire severly until the engine is shut down and restarted. It seems to do this more after a hot soak. I have only got it to act up once. The fuel pressure holds well...		 View
1998 Cadillac DeVille 4.6L Starting
after replacing pcm now vehicle doesnt start. code p0603. instrument cluster showers vehicle may not restart. performed the 10min leave key on cycle according to alldata. still no start any help would be appreciated		 View
2003 Cadillac CTS 3.2L MIL Lamp on
we installed a new dealer stat about 300 miles ago and same code has come back and curious if any others have run into this problem...also the cooling fans are not running all the time that i noticed since it came in thanks for any help.. Trouble codes: P0128 (coolant temp below t-stat regulating temp).		 View
1985 Chevrolet Camaro 5.0L Hesitation, MIL Lamp on
came in on tow truck would not start plugs fuel fouled. when cranking I found timing about 4 degrees retarded pulled dist. IT checked ok replace cap,rotor and plugs. now it starts and runs ok. the timing is not being controled by ecm. mil is on but wont recogn...		 View
1995 Chevrolet Monte Carlo 3.1L MIL Lamp on
Hi all, We have a 1995 Monte Carlo came in last fall with the check engine light on(Code 77, EGR solenoid #3) After inpsecting and cleaning the system, we found nothing else wrong and replaced the valve with an ACDelco unit. The light was off for two months... Trouble codes: 77 (egr solenoid 3).		 View
1996 Chevrolet Tahoe 5.7L transfercase
Complaint is a loud snapping noise in reverse with wheel turned to right in 4 wheel high.The rear diff. is non locking.We checked that all tires were the same size.Pulled the tail off the transfer case to check that the snap ring was not broken,its ok.Removed ...		 View
1998 Chevrolet Pickup 5.7L Poor Idle Quality, MIL Lamp on
Hey there guys, This Chevy came in about a month ago for the same trouble codes. We disassembled the intake and found the fuel injector "spider" assembly leaking you know the usual common problem. We installed an aftermarket assembly,changed the oil and sent t... Trouble codes: PO172 (System Rich B1), PO175 (System Rich B2).		 View
1998 Chevrolet Pickup 7.4L fuel guage
fuel contol module problem.gas guage not working,still pumps out of rear tank sometimes,most items have been replaced more then once,the control module has had a new connector put on it,we have searched tech bulletins and found no help.if you can help find a n...		 View
2004 Chevrolet Silverado 8.1L driver info. center
i hunted down all the wiring from the switch in the steering wheel to the cluster and could see the voltage drop when i pushed the button , as in the message was sent from the switch but never recieved by the cluster. at this point i am stuck and need some ide...		 View
1996 GMC Suburban 5.7L MIL Lamp on
This rig came in with the above code and we replaced the sensor B2S2. Took on a test drive with scanner attached and the sensor reads low a lot of the time. On Highway cruise, it will mimic B1S2 and stay around .68-.720 v but in town while the B1S2 sensor will... Trouble codes: P0157 (O2 B2S2 low voltage reading).		 View
2004 GMC Yukon 6.0L Hesitation
customer complains of int hesitation that will last for 4-[...]. while driving truck i duplicated the problem one time. it feelslike a dead spot on the tps. this is a throttle by wire. the app and tps did not drop out on the scanner. un fortunately it only ...		 View
1995 Oldsmobile Cutlass Ciera 3.1L service engine soon
hello please any help or info will be appreciated.this vehicle keeps setiing egr solenoid error codes. have replaced egr valve with several others, still same problem.this egr valve has 4 wires i have 12 volts on one wire and the other 3 go to the computer , w... Trouble codes: 1405 (egr solenoid error).		 View
1993 Pontiac Grand Am 3.3L gas in oil
car came to us after another shop. complaint is gas in oil. we originally found bad o2 sensor - stuck lean when hot - replaced. car runs well and new o2 sensor reads good, lots of cross counts, changed oil. delivered car yesterday morning. comes back today wit...		 View
1996 Pontiac Sunfire 2.4L radio
this is my wifes car the light in the radio that lights up the clock and channel display is burnt out i removed the front plate and soldered in an led but it barely lights up i wonder if anyone knows the voltage of the bulb or has a part # foe the bulb otherwi...		 View
1999 Pontiac Grand Am 3.4L Steering
My problem is with the variable effort power steering on this car. I am unfamiliar with this system. The complaint is that there is not enough steering assist at low speeds. Before bringing the car to me the customer replaced the power steering pump with a reb...		 View
2001 Saturn LW300 3.0L odometer
hello all well this saturn reads 694978 on odometer and thirteen miles less on the body control module with the modis we have no codes odometer is not recording mileage and niether is the bcm speed sensors and speedometer are working we have no problems with h...		 View
2004 Saturn Vue 3.5L Misfire
We've got a 2004 Saturn Vue that has an intermitent skip on multiple cylinders but mostly occurs on cyl #2. At times it will run great and other times it will have a major skip. We've swapped coils with a good cyl. but the skip stayed on cylinder #2. Also, som... Trouble codes: P0300 (Multiple Misfire), P0301 (Cyl 1 Misfire), P0302 (Cyl 2 Misfire), P0304 (Cyl 4 Misfire), P0305 (Cyl 5 Misfire).		 View

Fixes & Summaries for GM
Fix/Summary Answers
1990 Cadillac Brougham 5.7L Stall
well after some testing found the distributor to be faulty replaced it as a complete assembly and all is well thanks to all that replied 		14
1991 Cadillac DeVille 4.9L hood cable
First thanx for all the replies. I did try the coat hanger with a hook but it would just straighten out. The latch was binding. The cable broke at the very end tip by the latch so grabbing it further back did not work either. So I cheated. With the customer...		 9
1996 Cadillac Seville 4.6L valve covers
So many of you indicated that problem was in pcv system and excessive crankcase pressure.After a very intense check of system we found that the passages in the throttle body were blocked. Someone had made their own throttle body gasket and did not cut out the ...		 14
1999 Cadillac Escalade 5.7L Shutter over 55
All injectors where off. 1 & 3 2 & 4 5 & 7 6 & 8 were all crossed. Who ever did the intake gasket realy screwed things up. The problem is now fixed and I would like to thank all who sent in replies. thanks agian everyone. Trouble codes: po405 (egr swsr ckt low v).		 3
1992 Chevrolet Lumina 3.1L Poor Idle Quality
Hey guys-thank you for all of the responses-a lot of you suggested the lower intake could be sucking air internally-I took the filler cap off to check for vacume-couldnt really feal anything-pulled dip stick and still nothing for sure-after tapping on comp-wig...		 22
1997 Chevrolet S10 Pickup 4.3L ig key cyl
WOW! This thing kicked my but. If only I had a wiring diagram I could have saved tons of time. Thanks to laneard from Texas he hit the nail on the head there was a broken wire at the shift lock sw on the floor shifter. It was a yellow wire that none of the ele...		 4
1997 Chevrolet Pickup 5.7L brake pedal
well, as it turns out the hcu we installed was the cause of the low pedal. internal problem and a slight external leak that i didnt catch on initial inspection. the cause of the slow pedal return ended up being dirty p/s fluid. customer replaced p/s pump and p...		 10
2002 Chevrolet Express 5.0L Cuts out, blows fuse
Hi: This one is fixed. We had some very good suggestions on places that this circuit can fail. The problem areas are rub thrus at the left front control arm,transmission area and if equiped with oil pressure cut off(which may not show up in the wiring diagra...		 11
1998 GMC Jimmy 4.3L security system
I checked the bcm with another know good one from another car and made no differece, we also checked the wiring from the bcm to the ign tumbler and all were good the only thing left was a short in the wiring from some where else in the blazer that ran to the b...		 7
2003 GMC Savana 4.8L Misfire
we did fix this on our own after some time and wasted time --with the computer codes picking up a misfire -did not roadtest because it was in last week for a coil pack and plug -we then install 8 new plugs and wires , before the road test --it had no power an... Trouble codes: 300 (multiple misfire).		 5
1987 Oldsmobile Cutlass Ciera 3.8L MIL Lamp on
Everyone had great ideas on what the problem could be, it turned out to be a faulty solenoid. It would switch and send vacum to the egr, Pin c has 12v with key on. egr off. when the solenoid closes (egr opens) pin c should lose voltage. the computer looks for ... Trouble codes: 32 (e.g.r).		 7
1999 Oldsmobile Alero 2.4L wiring ?
Thank you all who responded - the answer was water intrusion. Upon further investigation we found the whole fuse box on drivers side with a large amount of moisture. We removed the box and let it dry out over a heater overnight. We reinstalled box and all prob...		 7
1999 Oldsmobile Alero 2.4L front end
Well my fellow techs, this is fixed but it came with a little help from a friend of mine that owns a tranny shop. Apparently there is a chain on these vehicles that drives the torque converter from the engine. It so happens that this chain developed enough sla...		 16
1999 Pontiac Grand Am 2.4L Misfire, MIL Lamp on
Had a couple of replies to check exhaust restriction – we had, it was minimal. We were not able to get the car back for a few days, when it came back she said she had not added any coolant between visits. We found the coolant level where we had left it, no mea...		 5
2004 Pontiac Grand Am 3.4L not sure
Thank you very much to the 15 Techs that took time out of their busy schedules to offer help. Sorrt this rely took so long the young lady took the vehicle to Baltimore for a family get together. 5 Techs said either/or the hazzard flasher switch or the turn sig...		 15
1997 Saturn SW2 1.9L ignition switch
thank you as always for the help. everybody agreed that this switch was just plug and play and it was. we installed the new switch today without any complications. no programming or relearn was required. we did not replace the key and tumblers only the electri...		 10
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next