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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for March 2, 2012
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Open Help Requests for GM
Help Request Answers
1996 Chevrolet S10 LS 2.2L MIL Lamp on VIN: 1GCCS1948T
S10 with no power,customer says been steadily getting worse.felt like badly plugged cat.did backpressure test 1.5 psi-we pulled pipe off at manifold anyway-same problem.fuel press ok.wondered about timing chain jump with 175k miles but engine starts right up,c... Trouble codes: P0172 (System rich), P0122 (Tps)
1998 Chevrolet Express 1500 5.7L No Start VIN: 1GBFG15R1W
hey guys have a van that had to replace the right cylinder head because a spark plug broke off inside of the head. installed head and when went to start car it starts for a split second and stalls out. checked for spark and saw it was intermittent. pulled the ...
1999 Chevrolet Blazer 4.3L No Start VIN: 1GNCS13W3X
The blazer cranks ok when i disable the spark but if i plug in the coil it cranks as if the timing is off. I set it at tdc and checked the rotor position it was right on. Pulled the distributor to check gear it is ok. Hoping i could get some insight from iatn ...
2000 Chevrolet Silverado 2500 6.0L 4x4 shift control VIN: 1GCGK29U7Y
got vehicle 4x4 inop if you select button auto and 2 wheel work but when you click 4hi or 4lo I hear what sounds like the brake for the encoder motor and the encoder motor moving. scan vehicle find a c0387 shift could not complete code. look at scan data to fi...
2002 Chevrolet S10 2.2L Timing Chain VIN: 1GCCS19502
This vehicle has about 195,000 miles on it. It is coming back in on Monday. Back in April '10, it came in with a timing chain noise. We diagnosed it and replaced the timing chain. 4 months later it came back with the timing chain making noise again. We used a ...
2004 Chevrolet Express 3500 LS 6.0L MIL Lamp on VIN: 1GAHG35U44
Van came in orginally with engine light on and fuel gauge on empty. 3 codes stored p0122 tps ciruit malf. p0455 evap large leak p1432 fuel level sensor 2 low voltage -- Now van is all back together fuel gauge works cleared all codes but P1432 returns on short ... Trouble codes: P1432
2006 Chevrolet Express 1500 4.3L MIL Lamp on VIN: 1GCFG15X46
the van was bought it in the option,the problem is it not power under load at all.the van in park or nutral runing smoth and normal,raise rmp normal but when i put the car in drive or reverse no power at all,somebody cleaner catalyst both sides that why i have... Trouble codes: P0507, P0420, P0430
2007 Chevrolet Malibu LS 3.5L power assist VIN: 1G1ZS58N47
Hi, I've been a subscriber for a long time but have never asked for help before. You guys are great. This car has an intermittent no power assist complaint with a c0545. They can turn the key off & back on & it will work. I played around & got it to do it in m...
2007 Chevrolet Tahoe LTZ 5.3L Down Shift And Starts In 3 Gear From Stop VIN: 1GNFK13027
Truck came in and customer complained of slip. Drove truck and truck would not down shift sometimes, felt like it started in 2nd or 3rd geat when you put shifter into low and shift manually works fine
1993 GMC K1500 Suburban SLE 5.7L neutral switch VIN: 1GKFK16K2P
Hi Guys.. I need some electrical theory on GM neutral switch for this truck...Neutral switch unplugged and starts in any gear..Mitchel wiring doesn't show anything for this circuit Except Purple wire leaving ignition switch & going directly to starter,no neutr...
2000 GMC Savana 3500 5.7L No Start, Poor Idle Quality
I put a reman Jasper motor in the van about 3mths ago. Customer came back stateing it some times idles high and stalls. I got the van to stall it now won't start unless you hold the gas pedal down. It will run as soon as you let up on pedal its stall. Change t...
2000 Pontiac Grand Prix GT 3.8L intake plenum VIN: 1G2WP52K2Y
replaced upper intake plenum 2-3 thousand miles ago now leaking externally again makes puddles on top of lower intake manifold. i used customer part was dorman is this brand known to have problems ive done at least 20 lower intake gaskets and a few upper repla...
2004 Saturn Ion-2 2.2L Excessive Emissions VIN: 1G8AM14F64
Well i have this saturn ion that has high nox gases at 15 mph 632ppm max is 459 and not that much lower at 25mph 640ppm max is 746. Hc is 8ppm at 15 mph and 10 ppm at 25mph,co is 0.14 at 15mph max is .53 and 0.13 at 25 mph max is 0.51,c02 is 14.8 both speeds a...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNCS13W8T
Holy cow, guess you all were invited to this party before me. 30 replies, darn near everyone said to modify the hold down clamp which is what I did.Some of you said aftermarket camshafts cause this as well as timing gear one tooth off. Thank you everyone, this... Trouble codes: P1345 (Crank/Cam Correlation problem).
2003 Chevrolet Silverado 1500 5.3L Transfer case module VIN: 1GCEK19T03
Thanks to all who replied. The customer is short on money and time and did not want to spend the money to diagnose the problem. I ended up putting a used ATC module on it. It would power up the selector switch, run codes and would respond to bi-directional con...
2004 Chevrolet Aveo 1.6L Mechanical VIN: KL1TD52674
This thing is fixed and out of my garage. Want to thank Jason for the very thorough procedure for replacing the timing belt. Funny thing is this thing has a knock (really loud) between 1500 and 2000 rpm. I called the owner to let him know and he tells me "yah ...
2005 Chevrolet Colorado Z85 LS 3.5L abs sensor VIN: 1GCDS13625
thamks for all the ideas all the testing is done with the ebcm disconected and everything looked good what you dont know is how the ebcm sees the data so we stuck a small pick in the connecter terminals and tighten up the connecters and all is good it is the u...
2006 Chevrolet Express 1500 4.3L flooding out VIN: 1GCFG15X36
went to pull the plugs out and gas started streaming out of the cylinders. the aftermarket regulator was allowing gas to pour into the cylinders got one from the dealer and vehicle has run great Trouble codes: P0172, P0175.
2007 Chevrolet Impala LT 3.9L Traction Control VIN: 2G1WC58R17
2008 Chevrolet Uplander LS 3.9L compressor VIN: 1GNDV23178
Thanks for all the replies. Many asked about the fans and the low side pressure, they were normal. We noticed that the condenser was only hot in the very top corner where the line from the compressor entered, the rest of the condenser was cold. We initially di...
1992 GMC C6000 Topkick C6H042 6.0L battery dead VIN: 1GDJ6H1P8N
although i was not able to obtain a wire diagram for this truck i replaced the parking brake warning relay as it is normally powered up with the key off and runs off the door switch. hoping that the relay was sticking on intermitently. been 6 days since repair...
2001 Oldsmobile Alero GL 2.4L Misfire VIN: 1G3NL52TX1
i ran a can of gm top engine cleaner through the the tb ,and put some oil cond in the oil ,customer is goeing to drive and let me know,i will follow up thanks Trouble codes: P0300.
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