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Prev Professional Automotive Repair Technical Discussions for October 12, 2006
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Open Help Requests for GM
Help Request Answers
1996 Buick Riviera 3.8L No battery charge VIN: 1G4GD2215T
Vehicle came in not charging. Customer had installed alternator himself. I followed Alldata flow chart, Alldata stated to replace alternator. I took the alternator to NAPA to use their alternator tester and the alternator tested good. Thank you in advance for ...
1989 Chevrolet Corvette 5.7L Disc Brake system VIN: 1GIYY3181K
I hope there are some Corvette techs out there. This one was dropped in my lap a couple of days ago. Problem is vehicle will not stop without excessive pedal effort. It acted like a bad booster but without the tell tale hard pedal. I checked the vacuum supply ...
1993 Chevrolet C1500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GCDC14K9P
We received this vehicle from another shop which had rebuilt the motor and can not get it to idle correctly. The TBI injectors seem to be pumping in too much fuel at idle. we have replaced the following components: MAP sensor, TPS sensor, Temp sensor, ECM and ...
1994 Chevrolet K1500 5.7L Axle actuator VIN: 2GCEK19KXR
Hi all, I want to thank you in advance for your help. This truck had a updated front axle actuator and wiring harness installed nearly a year ago at a Chevy dealership. The axle was locked on, all the time. We pulled the actuator out and fount it stuck in the ...
1995 Chevrolet K1500 5.7L brake pedal VIN: 2GCEK19K5S
installed new drums shoes and wheel cyls adjusted brakes and replaced master cyl with new after-market bleed system according to shop-key with power bleeder. pedal still go's to floor truck pulls to left when stopping hard. install rem calipers and all 3 rubbe...
1996 Chevrolet K2500 Cheyenne 5.7L Misfire, Surge VIN: 1GCGK24R4T
When I scan this vehicle with my Snap On 2500 and try to access the misfire data all values read 0 and remain there, including the misfire cycle count. I can access all other systems ok. Can anyone offer a reason to this? This vehicle had a bad surge at cruise...
1997 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC5245V
dies on customer after long drive cant get it to die my self. had these codes i replaced crank sensor but died a gain after a week still has codes Trouble codes: P0341, P0335
1998 Chevrolet Lumina 3.1L High idle VIN: 2G1WL52M5W
Only saw this car act up once, for about 10 minutes. Customer states that the idle is high. Did experience high idle, about 2200 rpm. While the car was acting up I scanned the car and found no 24x crank sensor signal and high IAC count (90). Went into function...
1999 Chevrolet Blazer 4.3L climate control VIN: 1GNDT13W4X
I have this 99 blazer here. The electronic cliamte control is inoperative. No power to any of the functions except the reciculate light comes on sometimes. I have checked fuses. attempted to scan body control with no luck. I am using a modis and do not see a o...
1999 Chevrolet Silverado 1500 5.3L Misfire, MIL Lamp on VIN: 1GCEC14T3Y
this pick up is giving me a bit of trouble it came in with a mil and p0300. with the mileage and age we started with a set of delco plugs and still runs very rough at an idle with the most noticeable skip coming from cylinder # 4 we tried a new coil ... Trouble codes: P0300
2001 Chevrolet Impala 3.4L Unknown VIN: 2GIWF55E81
Car came in no crank with new battery installed, we checked and repaired battery connection as needed. Engine would not turn over (electronics flicker then stabilize when ign is turned on), turned key on for ten minutes and then the car cranked and started nor...
2003 Chevrolet Silverado 2500 6.0L MIL Lamp on, No Accel. VIN: 1GCHK24U33
I have this high mileage Silverado here that the customer says will stop accelerating, and the "reduced engine power" message appears on the dash. Shut the truck of for 15 seconds, start it back up and everything is fine again, of course it sets the code p1516... Trouble codes: P1516
2004 Chevrolet C4500 Kodiak C4C042 6.6L No Start VIN: 1GBE4C1134
We have this 2004 C4500 Med duty in here (I entered it as a 3500, since the 4500 wasn't in the list, and it's the same anyway) that is a no-start. From all the research I've done, the only thing people have seen for a no-start is loss of fuel system prime. I h...
1997 Geo Tracker 1.6L MIL Lamp on VIN: 2CNBJ1365V
Vehicle originally came in with 2 codes, one for an o2 sensor heater circuit, and the p0400 for egr flow incorrect. After performing the entire mithchell flow chart, we came up with an egr vacuum modulator to enable the egr to work. We also replaced the front ... Trouble codes: P0400
1999 GMC Sonoma 2.2L Cooling Systems
vehicle came in leaking coolant and misfiring. 1 of our mechanics replaced the head gasket. head was replaced with a rebuild. since shortly after the repair the customer complained of a "cracking & burbling noise" from the engine. the engine does not overheat,...
2000 GMC Sierra 1500 SL 5.3L Low oil pressure VIN: 1GTEC19TXY
This truck is driven by an over the road salesman and is very well cared for. About 3 months ago he noticed oil pressure fluctuation on the guage. Recently in Arkansas (ambiant temp. 48 F) the oil pressure read 0 psi and had lifter noise and possible rod knock...
2001 GMC Sierra 2500 HD SL 6.0L Dash Lights VIN: 1DTHK29U31
This trucks's issue is that the Dash illumination lights do not work when the headlight switch is in the Automatic position (the headlights DO come on when they are supposed to). The dash lights DO work when the headlight switch is in the Manual position. In A...
2002 Oldsmobile Bravada 4.2L MIL Lamp on VIN: 1GHDT13S72
DTC P0014 sets,also sets P1345 intermittently, Mitchell sends to P0014 if set also. Cam timing does change usually, and sometimes is correct, other times it sticks retarded or advanced. It seemed like actuator concern, replaced with used actuator, seems to be ... Trouble codes: P0014 (cam phaser performance), P1345 (crank/cam sensor correlation)
2002 Saturn SC1 1.9L Misfire VIN: 1G8ZN12832
this car came in with a miss about 2 mos. ago. our other shop did tune up was ok for about a week . came back with chec eng lite po301 then they sent it to me. i check for spark ok ichanged plugs put in what it called for (its not what they had in there i can'... Trouble codes: P0300

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Regal LS 3.8L 1 gear VIN: ZG4WB52K4W
Thank you for all your responses. After further checking the trans was the problem. However the customer has decided to sell the vehicle without replacing the the trans.
1988 Chevrolet Celebrity 2.8L Surge, no power VIN: 2G1AW81W2J
The 'element' I was looking for on this help request was the RPM reading error -- I liked the replies for the PROM error, ign module, and RFI interference which makes 'sense' .. sadly this car was towed out and I never got to see first hand. I may be a littl...
1991 Chevrolet Lumina 3.1L Hesitation VIN: 2G1WL54T7M
Wow, what a tool this is! Extra special thanks to everyone ho helped. I recieved some very good responses ranging from adjusting minimum idle to drop iac counts to single digets in park. checking resistance of injectors, (all six fired at once, check resistanc...
1993 Chevrolet K2500 Cheyenne 6.5L 4th gear/overdrive VIN: 1GCGK29F0P
Jim from Washington hit this one correctly -- A PCM fixed it and all voltages returned to normal -- Thanks for the assistance . We set the TPS so that scan tool read .33 V with no solonoid voltage --factory method of TPS adjustment leaves a lot to be desired
1994 Chevrolet Blazer 6.5L neutral,reverse VIN: 1GNEK18S4R
Hi everyone, first of all thanks a million to the 12 people who offered their help. When we dropped the pan we found significant amount of 'parmesan steel' (trying to add local flavor to auto repair...). Due to amount of presumed damage we felt more confid...
1996 Chevrolet K1500 Cheyenne 5.7L Excessive Emissions VIN: 1GCEK19M3T
Sory for the delay, most of you that replied were leaning toward a new cat, I've been leaning the same way but cust dose'nt want to do it just yet. Emissions are erratic and ses light went off for a while but is now back on. Will probably put a new cat on even... Trouble codes: P0420 (TWC System low effeciency bank 1).
1997 Chevrolet K1500 Cheyenne 5.7L Misfire, MIL Lamp on VIN: 2GCEK19R7V
Well I got lots of replies on this one. A lot of people stated secondary ignition or fuel related problems. An ignition or fuel related problem will not cause the vacuum guage to fluctuate like it is doing, it has to be a mechanical problem with the sealing of... Trouble codes: P0300 (Random Misfire), P0305 (Misfire Cylinder 5).
1998 Chevrolet K1500 Cheyenne 5.7L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1GCEK19R3W
Thank you all for your replies. everything suggested checked out ok. customer has decided to drive truck as is. will repost if it comes back. Trouble codes: P0107.
2001 Chevrolet Suburban 1500 5.3L Steering/ Suspension VIN: 3GNEC16TX1
Finally it is fixed. The customer took it while I was researching the problem. The responses i recieved (26 total) were wide ranging. 6 said to check the torsion bar mounts. 4 the steering column shaft 'pop' (There is a tech bulletin about that one) 3 for the ...
2001 Chevrolet Cavalier 2.2L engine
I checked all wires under the dash for opens. Found none. Unhooked 4 wire harnesses that plug into BCM and plugged them back in, making sure connections were good. Car started right up and has started ever since. Maybe just a loose connection...
2000 GMC Yukon SLT 5.3L overheats VIN: 1GKEC13T4Y
Thanks to all the suggestions, 2 of you nailed it...The new water pump we installed (a new master brand) had the impeller reversed. We removed water pump for inspection and compared it with a new gm pump. Issue found. Installed new gm pump and fixed. Sometimes...
1991 Oldsmobile Cutlass Supreme 3.1L Poor Idle Quality, Surge VIN: 1G3WT34T4M
after checking for many vaccum leaks i decided to once again block all vaccums and disconnect the iac. vehicle started idling up to near 2500 rpm's checked removed the breather tube and found the iac was allowing air by with iac counts at zero. removed iac and... Trouble codes: 35 (iac problem intermitent), 33 (map).
2000 Oldsmobile Intrigue GX 3.5L cooling system VIN: 1G3WH52H3Y
Thanks to all who replied. Joe form Ohio helped out out alot with how this system flows. Ended up being a t-stat problem. Replaced w/ updated gm and problem is gone. Before replacing we bypassed the heater core and test drove and problems disapeared, apparentl...
2000 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HX54K0Y
Hello everyone, Thanks so much for everyone taking the time to reply too my posting.After the last update we got the car back to the shop running and could not get it too act up,so the customer wanted to take it.We explained the car probally will die again and... Trouble codes: P0101 (Mass or volume air flow A circuit range/Performance), P0121 (Throttle /Pedal position sensor/Switch A circuit range/performance problem).
2003 Pontiac Grand Prix GT 3.8L no power VIN: 1G2WP52K63
thanks for all the help we have sent this in for a warranty on the cat and the customer is happy. we wanted to cover everything before we sent it in for warranty thank you all i look forward to your halp next time
2003 Saturn Vue 3.0L dash cluster VIN: 5GZCZ63B73
Thanks to all that responded. We installed a new BCM and the customer has not had any problems in the past few days. This one is fixed.
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