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Prev Professional Automotive Repair Technical Discussions for July 5, 2012
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Open Help Requests for GM
Help Request Answers
2001 Buick Park Avenue Ultra 3.8L Misfire VIN: 1G4CU54131
Came in running bad found cyl number five not firing. Had spark so pulled plug and was flat. Something smashed gap closed. Reopened and road tested and will not do it again. Not sure what could intermitently close the gap on spark plug? when hard accelerating ... Trouble codes: P0300 (Random cyl missfire)
1993 Cadillac Fleetwood 5.7L lean condition VIN: 1G6DW5271P
This vehicle started out with an overheating condition caused by a ruptured heater core hose, that was repaired and has no overheating issues now. On the subsequent test drive it was noticed that the O2 reading would steadily drop to .000 and the fuel trims wo...
2005 Cadillac CTS 3.6L bushing VIN: 1G6DM57745
Clunk from drive to rev. @ or rev. to drive. problem is differential bushing is wiped out. dealer has part in stock (very common problem). first time for me. mitchell 1 OnDemand 5 estimate for this repair is 5.1 R@R differential assembly plus R@R bushing is th...
2005 Cadillac DeVille 4.6L Misfire VIN: 1G6KD54Y15
Hello all and thank in advance for any help, I have a 2005 Cadillac Deville that after it sets for awhile it will misfire when you first start it then clear right up and run fine, it has a p0300 in memory, and misfire counters show # 1 and # 2 cylinders having... Trouble codes: P0300
1998 Chevrolet S10 2.2L Starting VIN: 1GCCS1446W
sometimes will not start no crank security not blinking when it won't start I put it in neutral and hold key in start and move column shifter slightly back and forth and it will start I checked range switch and it was good.One time when it would not start I ha...
1998 Chevrolet Monte Carlo Z34 3.8L Rocker Arm VIN: 2G1WX12K5W
We have a 1998 Monte Carlo with a 3.8L. When the car first came in it was making a tappet noise upon inspection #6 cylinder intake rocker was not getting any oil but the rockers on either side of it were ok. We replaced all lifters and push rods and the one ba...
1999 Chevrolet Express 3500 LS 5.7L Poor Fuel Economy, Low power VIN: 1GAHG39RXX
Engine runs smooth with no misfire of hesitation, always starts right up. When rev'd it remains smooth but feels restricted (hence replacing the converters). Road test leaves you feeling less than satisfied as it struggles to reach speed limits in town. Codes ... Trouble codes: P0131 (Oxygen O2 Sensor Circuit Low Voltage Bank 1 Sensor 1), P0137 (Oxygen O2 Sensor Low Voltage Bank1 Sensor2), P0151 (Oxygen O2 Sensor Low Voltage Bank2 Sensor1), P0157 (Oxygen O2 Sensor Circuit Low Voltage Bank 2 Sensor 2), P0463 (Fuel Level Sensor Circuit High Input), P0327 (Knock Sensor Circuit Low Input Bank 1)
2000 Chevrolet Tracker 2.0L Brake "rattle" VIN: 2CNBJ13C5Y
It had 3 Master Cylinders replaced before I saw it along with some real butcher work on the brake system. I found no brake warning light application though it does indeed function with the E-Brake and fluid sensor. I pulled all 4 wheels and found the L/F calip...
2005 Chevrolet Suburban 1500 Z71 5.3L Instrument lamps VIN: 3GNFK16Z65
This short is being extremely difficult to locate. It's very intermittent. We can't seem to duplicate the short here. We have wiggled wire harnesses, went on many road tests but nothing. I've even drove it over the weekend, hoping it would short, but no luck. ...
2002 GMC Sonoma SLS 4.3L No Start VIN: 1GTDT13W82
This truck has been by us now 3 times and is driving me bonkers. Every time it comes in it is a no start but it starts every time I try it. Customer states that it starts and dies muliple times with no security lite and no codes. If it sits long enough will re...
2003 Oldsmobile Alero GL 2.2L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1G3NL52F13
Thanks for all of your help. The car was brought in with pore idle and lack of power but cruises fine has low vacuum but no leaks found with smoke has misses on all cylinders o2 is reading in the 800-900 range and fuel trim is @ 0 to low - range . Thanks again... Trouble codes: 300 (Missfire)
1995 Pontiac Grand Am SE 3.1L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Poor Fuel Economy, MIL Lamp on VIN: 1G2NE55M3S
Vehicle came in with a comlaint of chugging when accelerating, throttle pedal sticks, and high rpm. During test drive vehicle drove normally and no check engine light on. Drove the next day and vehicle had all of customers symtoms: chugging, very poor run, var... Trouble codes: 13, 21 (Oxygen sensor tps), 36, 41 (24x signal est line), 44, 45 (Lean rich), 74, 75 (A/c pressure egr), 85 (Prom error), 98 (Invalid pcm program)

Fixes & Summaries for GM
Fix/Summary Answers
2003 GMC Envoy SLT 4.2L air bags VIN: 1GKDS13S33
I originally suggested he replace air bags with springs- gave prices etc. Customer called back to say vehicle was not sagging, must of fixed it. I waited- sure enough- he decided to do conversion. Thanks to all who responded, sorry it took so long to reply, bu...
2007 GMC Acadia SLT 3.6L Timing Chain VIN: 1GKER23767
Thanks for all the replies, we have this all fixed and its as quiet as a mouse. Once we got inside we noticed that this has been done once before so second time now in 74,000 km. I think these 3.6 engines are here to replace the 3.1 intake gasket jobs. From wh...
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