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Prev Professional Automotive Repair Technical Discussions for August 30, 2010
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Open Help Requests for GM
Help Request Answers
1999 Buick Park Avenue 3.8L MIL Lamp on VIN: 1G4CW52K7X
please help evap problems, had code po442 and repaired bad wire and canister vent solenoid (also noticed fuel in canister when unhooked lines to check for contamination)see repair history. has anyone seen the fuel in canister and whats it mean (fuel in caniste... Trouble codes: P0442, P0440
1977 Chevrolet K5 Blazer Custom Deluxe 5.7L Cuts out, Power loss VIN: CKL187F116
OK guys, this is my baby and I am dumbfounded. I first must admit I am not that knowledgeable when it comes to carburetors, so I followed Edelbrock’s tuning procedures, and it ran fine until a few weeks ago. Accelerating around a corner, I got a cloud of trans...
1991 Chevrolet S10 4.3L Speedometer VIN: 1GCCS19Z3M
Hello fellow techs, have this s-10 pickup with no speedometer workee. Mileage is correct. Little lady driving to church and grocery store once a week. We replaced the speed sensor in tranny for grins with no effect. What's weird is when we hook up scanner and ...
1994 Chevrolet Lumina APV 3.1L wiper motor VIN: 1GNDU06L0R
Lumina apv came in with wiper inop. Installed new motor and module. Wipers now work. But, whenever the key is on or the engine is running the wipers operate in slow delay with the switch in the off position.
1995 Chevrolet K1500 5.7L No Start VIN: 2GCEK19KXS
Hey guys I had replaced the intake gasket in this truck and now I don't have injector pulse. Spark is good and if I hook my test light to positive and touch the purple/white wire at the module the pcm will fire the injectors. I have tried 2 new distributors an...
2000 Chevrolet Express 1500 4.3L MIL Lamp on VIN: 1GBFG15W6Y
hello fellow technicians. truck came in for misfire. found 4 codes listed. also i dont understand why i have a a.i.r code, this truck has no a.i.r system. atleast no relay, fuse or pump. well anyways wires were arcing and plugs were .030 worn over gap. replace... Trouble codes: P0171, P0174, P0174, P0410, P0420
2001 Chevrolet S10 4.3L MIL Lamp on VIN: 1GNCS13W91
Vehicle shows hard misfire. Came in with code p0304, clear code and goes to p0300. Computer scan data shows hard misfire cylinder #4. Vehicle exhibits no symptoms and is hitting on all cylinders. MIL is flashing. Code is false, no misfire is occuring. What c... Trouble codes: P0304, P0300
2002 Chevrolet Blazer LS 4.3L hard starting VIN: 1GNDT13W42
Could use a little verification of what I think is an ecm problem. Blazer has extended cranking problem, pretty much every time. We replaced fuel pump [gauge not working] but that didn't fix the starting problem. If we hook up modis, and command fuel pump on, ...
2002 Chevrolet Impala LS 3.8L abs VIN: 2G1WH55K92
Not really sure if this should be in the ABS or HVAC areas and this has been crossposted on the Snap-On Verus Forum. Just curious if anyone has had communication issues with an 02 Impala LS 3.8. Car originally came in with ABS light, Low Trac Light and Low Ti...
2002 Chevrolet Silverado 3500 6.0L No Start VIN: 1GBJC34U72
I have a truck with dual fuel tanks and Mitchell says that when the front fuel tank drops below a predetermined value the rear tank will pump into the front tank, but the front tank keeps running dry with the rear tank staying full. I replaced both fuel pumps ...
2005 Chevrolet Cobalt SS 2.0L clutch leaking VIN: 1G1AP14P55
came from body shop, body shop had another shop put clutch in the vehicle, replaced clutch master cyl & clutch slave cyl. Slave cyl is leaking we replaced the slave cyl and bled the system, has good strong pedal. then it goes away and leaks fluid this makes 3...
2005 Chevrolet Cobalt LS 2.2L struts VIN: 1G1AL52F25
makes noise when turning not moveing can feel spring moving
2006 Chevrolet Malibu LT 3.5L Cooling Systems VIN: 2G1WT58K26
customer brought this vehicle in shop stating that they are loosing antifreeze.I have pressure tested the cooling system to no avail,can't find any leak.spoke with customer they said they had just been adding water to system,I verified by checking freeze point...
2006 Chevrolet Express 2500 4.8L MIL Lamp on VIN: 1GCGG25V46
can misfire cause low manifold vacuum and a bad tps reading if vehicle is die's?/stalls. i have flashed latest calibration. clean injectors and have no misfires on misfire graphic. fuel trims are good..thanks for any help in advance Trouble codes: P0106, P0122, P0300
2007 Chevrolet Silverado 1500 LT 4.8L Mechanical VIN: 2GCEK13V57
Our customer has owned this truck since 07 when it had 15000 miles on it. We did pads & shoes with resurface at 39,000 miles. We did front pads & rotors at 63,000 miles. Came in at 68,000 miles with pads down to nothing again as well as the shoes. We did pads,...
2007 Chevrolet Malibu LS 2.2L Dashboard VIN: 1G12S58F57
When driving, the dashboard will have all the gauges drop to zero, the security light then kicks on, the maintenance light also kicks on. The radio says "Power Steering" on it and the odometer reads "error". Also the shift indicator scrolls through the gears. ...
2000 GMC K2500 Sierra SL 6.5L Cuts out, Stall VIN: 1GTGK29F3Y
This car is stalled at an idle for me, customer complaint was stall on accelleration. Both times started right up agian. I got a freeze frame of the stall. Cam ref missed spikes to 2 and ckp spikes to 2. There are multiply cam and ckp ref missed through out bu...
1995 Oldsmobile 88 Royale 3.8L MIL Lamp on VIN: 1G3HN52K7S
I have posted 3 waveform patterns under waveforms. Cant get them on this post. What am I missing. I originally felt the pcm was at fault. After 1 acdelco pcm would not even start the car we go #2 acdelco pcm which would flag a p0341 and p0342. Well I still fau... Trouble codes: P0342 (Cam Sensor Circuit)
2001 Oldsmobile Bravada 4.3L Starting VIN: 1GHDT13W21
First off, thank you for your time to help us out! We got this Bravada in with an intermittent starting issue. I jumped in it, and it started right up. I waited 15 minutes, and tried to start it, and it wouldn't start. To explain what I mean by "no starting...
2000 Pontiac Firebird Trans Am 5.7L Wipers VIN: 2G2FV22G6Y
When is dry outside and wipers are not turned on, they do not come on by themselves, since I am leaning toward the circuit board I wanted that out of the way, when is raining and turn wipers on to intermittent will wipe ok for a bit and then will go to low spe...
2002 Pontiac Grand Am GT 3.4L Cooling Systems VIN: 1G2NW5ZES2
idles forever @ computer temp reading 200 degrees, then not everytime so sometimes crack throttle to 1500rpm and that makes computer temp rise between 204 - 208 and then it bubbles and pushes the coolant tank out. temp @ thermostat 180, @ water pump 180, @ top...

Fixes & Summaries for GM
Fix/Summary Answers
2004 Cadillac SRX 4.6L Starting VIN: 1GYED63A64
Thanks to all who responded,after spending many hours of diag we replaced the battery and the problem was solved. Thank you IATN
1985 Chevrolet Camaro Z28 Iroc-Z 5.0L engine VIN: 7776565625
was running very lean. was losing fuel pressure. weird but that was the cause. thanks for all the replies
1995 Chevrolet K1500 5.7L Transfercase ? VIN: 2GCEK19KS1
Hey guys Thanks, Of course your own truck is the last one to be fixed.I had time Friday to look at it.I spent 25 yrs in the tire business, chasing vibrations isn't new to me. But this one is different.I have ruled out the U joints and rear end(I didn't think o...
1998 Chevrolet K1500 Silverado 5.7L ABS System VIN: 2GCEK19R3W
Numerous replies that suggested that the ABS sensors need to be looked at and that rust had driven them away from the reluctors. Right On The Money!!! I removed the sensors and cleaned under the mounting surface, the reluctor wheels themselves were clean but t...
1999 Chevrolet Express 3500 6.5L Excessive Emissions VIN: 1GCHG39FOX
Well, thanks again for all the useful information. Most of you led me to the waste gate system. It made sense after learning how the system works. After my update, Monty told me how to check the vacuum using the gauge and scan tool. I drove it again and I cou...
1999 Chevrolet Astro LT 4.3L Misfire, MIL Lamp on VIN: 1GNDM19W3X
Sorry for the late post. I finally got it to act up on a long grade at 50-55 mph. Could duplicate misfire every time. Is not losing spark, fuel psi is steady at 60. Did an injector balance test, all dropped 10 psi, passed. Did a compression test on the rh bank... Trouble codes: P0304 (Cyl 4 misfire).
2000 Chevrolet Silverado 1500 5.3L front end VIN: 2GCEC19T8Y
custemer had to take the truck most said to lube ball joints if they can not be lubed NAPA AUTO PARTS SELLS A KIT. cust. never returned.i will update if he does return.
2001 Chevrolet Express 3500 5.7L No Start, Hesitation VIN: 1GCHG39R11
faulty oil pressure sending unit, replacing fixed it.
2001 Chevrolet S10 4.3L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1GCCT19WX1
Thanks to all who responded to my cry for help! I am sorry to say I cannot close this with a fix because shortly after I requsted help the vehicle was picked up by the customer "for the weekend" and I was going to get another chance to fix it on monday. Well ... Trouble codes: P0300 (Random Missfire).
2001 Chevrolet Silverado 1500 5.3L change out VIN: 1GCEK14T21
so far trans fer case is installed wired the purple yellow wire so speed sensor works with the speedo. another 2 weeks before all fabrication is done, will update any new findings. once again thanks to all that replied
2003 Chevrolet Suburban 1500 LT 5.3L transfer case VIN: 1GNFK16243
so the long and short of it is that you just can't get a good used transfer case. so we went ahead and talked him into a remanufacured one from gm. the noise is gone and it works. im sure the noise we were hearing was the pump like alot of you suggested but co...
1992 Oldsmobile Bravada 4.3L Stall, stall in gear VIN: 1GHDT13W7N
Thanks for your input. Ok so turns out I was loosing signal from pick-up coil at low rpm pick-up coil was new twice so the magnet on the dist shaft is bad, replaced distributor assembly for fix.
2002 Oldsmobile Silhouette GLS 3.4L Poor Fuel Economy VIN: 1GHDX03EX2
I just went through esophageal cancer surgery and won't be back to work for two months or more. Cleaning and unplugging the maf made no difference. The backpressure readings were on a throttle snap, not at idle. Dropping the exhaust doesn't help. The ect range...
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