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Professional Automotive Repair Technical Discussions for June 10, 2016 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 2010 Chevrolet Silverado 1500 LS 4.8L Poor Idle Quality, Misfire, MIL Lamp on, misfire cyl 1 4 7 6 VIN: 3GCPCSEA1A we have checked all possible failure modes 1 sparks plugs ok 1 cop all ok swaped abba alwasys cyl 1 4 7 6 checked heads checked valves this engine does no have vlom manifold no cut out coils need help we have tried almost everything checked wire harness to p... Trouble codes: P0300 |
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| 2012 Chevrolet Camaro LS 3.6L MIL Lamp on VIN: 2G1FA1E37C Vehicle came in for MIL light on and running rough. Had a random misfire code, evap code and then these two. Misfire and evap are taken care of. But these two codes keep coming back. I cannot find any information on these two codes. Alldata does not even list ... Trouble codes: P0099 (Intake air temperature iat sensor 2 circuit intermittent), P114C |
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| 2014 Chevrolet Impala Limited LTZ 3.6L cooling VIN: 2G1WC5E32E The customer complains sometimes there is no cooling or hot air coming from vents. Blower is blowing correctly. Also found the AC pressures were 381 psi high side on a 109 degree day, and the cooling fans were on high. This car has manual AC with dual controls... |
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| 2015 Chevrolet Silverado 3500 HD LTZ 6.6L trl brakes What is working well to test the trailer brakes on the 2014 and newer chev 3500 duramax trucks. Currently using a trailer board with an incondescent light on the trailer brake circuit. Works good with the 2013 and older trucks but comes up on display "check tr... |
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| 2002 GMC Envoy SLE 4.2L Misfire VIN: 1GKDS13S22 Seen TSBs one about water intrusion. What do you think about these coils? Epoxy looks melted. One coil looks new, but when I asked about svc history he said, "Uhh... I don't know." Tried to put a sync probe on along with my amp clamp, but this intake design ma... Trouble codes: P0300 |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 2001 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP54K51 I ended up having this vehicles twin come in for a smog that only had 40k on it so I took that opportunity to trade the smog for getting a full relm of data from the vehicle, I was able to verfiy that my engine vacuum at m=our altitude was good and map reading... Trouble codes: P0401. |
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| 1998 Chevrolet S10 LS 4.3L Surge, Cuts out VIN: 1GCCS19X7W THANKS TO ALL WHO REPLIED. PROBLEM WAS INTAKE AIR TUBE FROM TROTTLE BODY TO MAF WAS CRACKED ON THE BOTTOM OF THE TUBE AND UNDER HARD LOAD WOULD FLEX ENOUGH TO OPEN UP AND MAF WOULD GO CRAZY. RAN TRUCK WITH MAF UNPLUGGED TO NARROW PROBLEM TO THAT AREA. THANKS A... |
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| 1999 Chevrolet Silverado 1500 5.3L shifting VIN: 2GCEK19T7X This one is definitely an internal issue. I built my own tester based on the one here: Switching both solenoids on, it is in 4th. Solenoid a off, and b on, it is still in 4th. Both solenoids off, it is in 3rd. Switchi... |
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| 2003 Pontiac Grand Prix SE 3.1L Hesitation, Stall, MIL Lamp on VIN: 1G2WK52J53 I went back in and found a loose connection where the 12x Sensor is plugged in above the oil filter. There are 2 sensors one on the harmonic balancer and another in the middle of the back of the block. Its running with no light at this time. Trouble codes: P0336. |
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