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Prev Professional Automotive Repair Technical Discussions for October 30, 2014
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Open Help Requests for GM
Help Request Answers
1996 Buick Skylark Custom 3.1L Theft VIN: 1G4NJ52M0T
Duplicated no start condition. Scanned for codes p1573, p1629 were found p1573, was current, cleared codes, and p1573, came right back, performed flow chart on concluded a problem with serial data circuit. Tested wiring to serial data circuit from pcm. All ohm...
2004 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDS13S04
Got this trailblazer for free cuz the old owner is tired of the mil light.this is a very well kept truck. oil very clean but we changed it anyhow (maxlife 5w30). We get this P0016 code every time the truck is cranked up. scoped the cam sensor & pattern looks g... Trouble codes: P0016
2008 Chevrolet Cobalt LT 2.2L Steering &Dash VIN: 1G1AL58F58
Cobolt will at times will set codes 1 u2100 can buss error 2 [...] of comunacation 3 u2111 lost of comuncation with power steering control, no power steering ,no gauges,radio car will start and run
2004 GMC Envoy XUV SLT 4.2L Engine Rattle VIN: 1GKET12S74
Customer brought vehicle back for t-chain inspection. Upon tear down, we found worn guides, slack in chain. So our heavy duty tech replaced t-chain with gears, tensioner,cam phaser actuator, oil pump housing with new pump gears. Confirmed timing chain and gear...
2004 Pontiac Grand Am GT 3.4L Stall VIN: 1G2NW52E34
Vehicle will never stall while running in shop. Vehicle will stall after 10-15 of driving time. Will restart within 30 seconds to 2 minutes and will run again for another 10-15 minutes. We were able to check for spark and fuel pressure which are both fine. Unf...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Chevrolet Caprice Classic 5.7L timing cover VIN: 1G1BL52P9R
We ordered a timing cover from Golen High Performance Engines because we did find a crack in the timing cover, installed that, & did not lube the water pump drive or distributor seals as mentioned in several letters I got & the little ole caprice does not have...
2005 Chevrolet Astro 4.3L Misfire, MIL Lamp on VIN: 1GNEL19X45
thanks for all informative replys.after trying a few more tests.leak down test,was 98%=o/k. new coil,no,diff.cust. declined further diag. I belive poss weak valve springs,or ecm driver weak.thanks again for all input.Bill Trouble codes: P0300, P1134.
1997 Pontiac Grand Prix SE 3.8L fuel sending unit 5 volt ref signal VIN: 1G2WJ52K4V
it is fixed, thanks to the guy who stated alldata shows 0-90 ohms. the sending unit in the 97 grand prix and van only is still the old typre 0-90 ohm sender. i put a 50 ohm resistor inline to a groud to the purple wire, the gause went to about half tank. we r...
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