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Prev Professional Automotive Repair Technical Discussions for June 2, 2009
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Open Help Requests for GM
Help Request Answers
1997 Chevrolet Blazer 4.3L Misfire, Spark knock VIN: 1GNDT13W4V
We have this Blazer that is missing over 55 mph. The code is random misfire and #1 and 6 show a slight misfire but it is mostly #2. The car has new plug wires, #4 was bad. The vehicle pings nearly all the time under acceleration but only misses on the highway.... Trouble codes: P0300
1999 Chevrolet C1500 Suburban 6.5L No Start VIN: 3GNFC16F9X
This vehicle has a very intermittent no start. Customer states that he can drive it 2 hours, let it sit for 20 minutes and it won't start. 30 min later it will. For me it wouldn't start 1 time and stayed that way for 3 days. Had a p1216 fuel response code in i...
1999 Chevrolet K2500 5.7L ignition switch VIN: 1GCGK24R3X
Hello Iatn members my customer came in with an intermittent no start after checking everything I scanned the codes and found a security code we ordered a new ignition switch and installed it but truck will not start although you can remove switch from colummn ...
1999 Chevrolet Express 2500 5.7L No Start, Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on
Ok where to begin. Fist off sorry for the no VIN as I'm writing this from home. I'll update this tomarrow with the VIN. Van came in with a check engine light on and security light on. Customer says the security light came on 3 weeks ago.go to scan for codes fi... Trouble codes: P1345
2000 Chevrolet Venture 3.4L Fuel gauge VIN: 1GNDX03E9Y
Purchased new sending unit, as old one was contacts were worn. Gauge goes to full, then after about 1 minute drops to empty. Tested for continuity, good all the way between ECM and sender connector. Resistance changes with movement of the sweep. Snap-On scanne...
2001 Chevrolet Venture LS 3.4L picks upspeed VIN: 1GNDX03E51
Customer complaint is that the van will pick up speed when cruising between 30 and 40 mph, will have to ride the brake to slow down. I have road tested this van numerous times and cannot duplicate this problem. Problem is intermittant with customer also, she i...
2001 Chevrolet c6500 7.8L Starting VIN: 1GBJ7H1C71
I need some help from you cat guys. I inherated a problem child. I have a 2001 chevy c 6500 with a 3126B cat. The truck will not start. I can not scan due to it being a chevy. Some one else replaced the heui pump and all fuel filters. I have tested injection p...
2002 Chevrolet Avalanche 1500 5.3L No Start VIN: 3GNEC13T52
2002 avalanche,will crank for a split second and shutoff imediately,as if the anti-theft is activated.suspect vehicle hit by lighting,after nearby lightning strike,onstar light is red and now wont run,Tech2 wont communicate with any module,suspect BCM ok due t...
2002 Chevrolet Blazer Xtreme 4.3L instrument cluster VIN: 1GNCS18W62
Hello all i have one that has got me stumped needless to say.The customer brought this to me after he had noticed his guages fluctuating while driving than stalling.could restart but vehicle would not idle.By the time the vehicle gets to me everything appears ...
2006 Chevrolet Corvette Z06 7.0L lean code VIN: 1G1YY26E26
car has a man switch installed , this opens the exhaust buterflies upon activation of switch giving a more free flowing exhaust when open, car normally opens these butterflies at about 3500 RPM . while driving with butterflies open , car sets lean fuel trim co... Trouble codes: 171 (o2 sensor lean fuel trim bank1), 174 (o2 sensor lean fuel trim bank 2)
2008 Chevrolet Silverado 3500 HD WT 6.6L MIL Lamp on VIN: 1GCHK33678
Need help with this 6.6dsl. Customer states that at random times the vehicle displays reduced power and ses light on. Usaly happens after coming to a stop. I verify the issue it happens to me with in few seconds of start up almost every time. Reduced power mes... Trouble codes: P0101, P0401 (Egr Flow Insufficient)
1993 GMC K1500 Suburban 5.7L Excessive Emissions VIN: 1GDFK16K1P
I'm out of ideas on this thing. o2 sensor would not go over .5v initially, replaced o2 sensor, now have active o2 sensor .2 to .8v, found ignition timing at 23 deg advanced, retarded to 0 deg, coolant temp is reading correct at 206 deg F, map sensor is correct...
1999 GMC Safari SL 4.3L Steering Box, Pump VIN: 1GKDM19W2X
Greetings All! More strangeness. This van came in for complaint of fluid leak. Found the steering box leaking and replaced it. After 'bout a month or so, came back complaining of noise. Now this isn't the standard light groan/hiss that is normal. This noise is...
2002 GMC Sonoma SLS 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTDT13W32
hello, I have this van that was having a multiple cylinder misfire. After doing some checks I found it could be a possible intake problem. the intake was leaking oil anyway so I did it. Now the problem im having is a cylinder 5 misfire. When I pull the plug of...
1995 Oldsmobile Cutlass Ciera 3.1L Cuts out, Stall, MIL Lamp on VIN: 1G3AJ55M9S
I recieved vehicle with mil light on and vehicle cuts out while idling, Owner installed new cam sensor, I scanned it and still had code P0341. Checked wiring, Found OK. I installed new Crank sensor 24x. Now I have a code P0321 but no code P0341, Vehicle starts... Trouble codes: P0341, P0321
1994 Pontiac Grand Am SE 2.3L Excessive Emissions, Poor Idle Quality, Stall VIN: 1G2NE1532R
"calling all quad four experts!" the computer shows the wrong vacuum readings, but I have replaced the map sensor, oxygen sensor and fouled-rich plugs to no avail. It acts like it's backfiring when cranking, and only starts with the accelerator applied. I keep...
2001 Pontiac Montana 3.4L power windows VIN: 1GMDX03E01
Hello everyone, thanks for any help you can give me with this Montana. I have no power window operation. I have no power at the power window circuit breaker in interior fuse panel. Trying to find the rap relay. Cannot find the relay box by Alldata. Looked on b...
2002 Pontiac Grand Prix SE 3.1L keyless entry,doorlocks VIN: 2G2WK52J32
the door locks work when I open the doors at times- they lock when you open the door- I've checked grounds and connections at BCM- I see no water damage to harness- at times when you get in the car the door locks will lock and unlock numerous times and then ju...
2002 Pontiac Sunfire SE 2.2L Misfire
this car just seems to misfire at times with a light load to accelerate but flooring it to the floor it will be fine, no codes, no misfire counters, fuel pressure ok when misfiring, now the fun part, the 02 sensor leans out for like 1 second when it jerks, it'...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Regal Custom 3.8L No Start VIN: 2G4WB54LXN
hi to all sorry it took so long i had to work it between customer appointments. anyway to all thankyou so much the harness to cam, crank and module was the issue. no visible signs of a wiring problem after it was removed and ohms test was perfect. so i cant th...
1997 Cadillac Eldorado 4.6L driver's temp door VIN: 1G6EL12Y8W
Thanks to all who responded. The problem was in the instrument cluster. The IPC was replaced several months ago. The options set up for the new IPC was for single zone instead of dual zone temp control. After resetting the options, the system works fine. Thank...
1983 Chevrolet K20 Custom 5.7L master cylinder hydraulics VIN: 1GCGK24M1D
2002 Chevrolet Express 2500 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1SCSS25R42
we fixed the code p1345 by putting in a second new distributor . the p0300 miss fire was still present so back to basics . compression test found that # 4 cylinder had 0 psi . thanks for all the replies . Trouble codes: P0330, P1345.
2007 Chevrolet Silverado 1500 WT 5.3L speedometer VIN: 2GCEK13M87
you have to purchase the vci # from gm & program it into the bcm.
1998 GMC K2500 Sierra SL 6.5L Stall VIN: 1GTGK29F3W
sounds like a common issue thanks to all that help replacing the pdm and relocating it with a heat sink fixed this problem and it wasn't as hard as it looked
1998 GMC K3500 Sierra SL 5.7L Unknown VIN: 1GTHK39R2W
I want to thank everyone for their answers. Roger [...] pulled the trigger first so I ordered the hoses last night. This was a majority of what every one had said. None of my local parts stores stocked these. I changed them and that did the trick. I guess I...
1999 Pontiac Bonneville SE 3.8L power door locks, power windows VIN: 1G2HX52K7X
well, we finally got this thing done. took awhile to get the car back. we ended up finding numerous grounds that looked good and tight but had poor contact. re-established good grounds and problem solved. thanks to everyone who offered help.
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