iATN Member GM Auto Repair Tech Exchange for June 24, 2008

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Open Help Requests for GM

	Help Request	Answers
	1994 Buick LeSabre 3.8L No Start, Hesitation, Cuts out, Stall, MIL Lamp on hi everyone, I have a good one here, this car has an intermitten no start. The cam and crank sensors have been replaced along with the icm and pcm. Still having a no start condition once in a blue moon. It is not consistant, have checked all related wiring an... Trouble codes: po341 (camcrank error), po342 (cam signal circuit).	View
	1992 Cadillac DeVille 4.9L power falls off HI Guys, This Cadillac has never been worked on by anyone else but us since it was new. The owner passed away and his wife now drives it. She brings it in having a loss of power after driven over thiry or forty miles. Pull the car over and shut off the engi...	View
	2004 Cadillac CTS 3.6L brake lights only has middle brake light, no r-h or l-h brake light. have checked fuses under hood and under rear seat. also emg. flasher only works lower amber lights.i think maybe brake singal wire goes through turn singal switch. brake lihgt switch is working, thanks fo...	View
	1995 Chevrolet Camaro 3.4L Poor Idle Quality, Misfire Dear chevy techs, I have this 95 chevy camaro that came in for misfire problem. During diagnosis, checked spark plugs and wires(ok), this has the OBD II connector, but does not give misfire codes. Ran cylinder power balance through scan tool, and when deactiva...	View
	1995 Chevrolet Blazer 4.3L Hesitation, Surge, Stall Hi guys, This truck had a GM long block installed, about 5000 miles ago. My customer bought the car with this problem. He was told that it ran good after the engine was replaced, and quit driving it when it started running bad. It sat for about 2 years. When i...	View
	1995 Chevrolet Corsica 3.1L No Start Customer states that he tried starting the car after sitting a while and it would crank but not start. During cranking the belt tensioner broke and the belt fell off. At that point he had it towed. Testing revieled good spark but no inj pulse. Tested crank and...	View
	1996 Chevrolet S10 Pickup 2.2L Poor Idle Quality, Hesitation, Stall results from diagnostic tests showed code for high map voltage, checked map with vantage and vac pump- all checked good. Did smoke test for vac leaks but didn't find any. Checked fuel pressure at idle it was in the low 40's. The truck will not take fuel past 1... Trouble codes: p0108 (map sensor voltage high).	View
	2001 Chevrolet Express 5.7L No Start van towed in , no starting. van started for about 2,minutes. and ran good with no misfire or hesitation. then died, no start again. fuel press. at 55psi. found dist. cap had white corosion, replaced hole distributor with ac delco, cap and rotor. good spark and...	View
	2001 Chevrolet Express 5.0L MIL Lamp on Sorry about the lack of certan info this is a over the phone problem. This van came in failing I/M with a P0160 no activeity on bank 2 sensor 2. The funny thing is that it has no bank 2 sensor 2! 2 o2 sensors at the exhast manifolds and one after the cat (B1S2... Trouble codes: p0160 (no activeity bank 2 sensor 2).	View
	2003 Chevrolet Express 6.0L Poor Idle Quality, Misfire van will intermittently sart running poorly. missfire counters show 2,4,6,8 all miss fire. problem will come and go. looked at injetor amp ramp and no problems there. also amp ramped coils still no problems found. Trouble codes: P0300 (random miss fire).	View
	1990 Geo Prizm 1.6L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall OK I am puuling my hair out on this one!! The car starts fine, sometimes when it is cold it will stall one ot two times right away, but starts right back up. As you start to drive it (with no warm up period) the car runs GREAT, but then after about 3 to 4 city... Trouble codes: 12 (No RPM signal for 2 seconds).	View
	1997 GMC Pickup 7.4L starting system This truck has a long crank time, 5 to 10 seconds on cold or hot starts. Truck will idle and run great after starting and all sensors are within range while idling and road testing. Origional platinum spark plugs still looks great, spark plug wires checked out...	View
	2005 GMC Yukon 6.0L Unknown Good Evening everyone. I have an interesting one tonight. We had an 05 Denali towed in after being severely overheated. The customer drove the truck very hot for a while and shut it down too late. The truck got towed off the parkway. It was then towed to the d...	View
	2001 Oldsmobile Aurora 3.5L Starting Vehicle came in on hook after sitting for approx 2 yrs. Cust stated batt would not hold chrg. Customer had wrong battery installed in car. We HAD car running told customer he needed correct vented battery for car. Batt goes under seat. Got go-ahead, installed ...	View
	1992 Pontiac Bonneville 3.8L no spark Hello, this 1992 bonneville was towed in. good fuel, good injector pulse but no spark. we replaced the module and coil. this is the magnavox design ( one coil with 6 towers) and spark plugs. the car does now start but runs poorly after this. we replaced the cr...	View
	2003 Saturn Ion 1 2.2L Misfire Good evening and thanks. This Saturn had MIL light on several weeks ago and local Cheveron station scanned and found code P0300, replaced origninal spark plugs with new NGK Platiniums. Returned car to customer and several days later MIL returned. Dropped into ... Trouble codes: P0300 (random miss fire).	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Cadillac Seville 4.6L no compressor engagement WELL IVE DONE EVERYTHING EVERYBODY SUGGESTED FROM DISCONNECTING BATTERY TO REPLACEING BOTH SWITCHES AND EVEN REPLACED IPM AND STILL CHECKING.DID FIND RECIRC.DOOR BROKEN AND ACTUATOR BAD BUT THAT SHOULD NOT KEEP A/CFROM WORKING.THANKS FOR ALL THE SUGGESTIONS WI...	19
	1987 Chevrolet Pickup 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, MIL Lamp on Hi Guys, Well, it turned out to be a combination of things as it usually does. The egr was sticking intermittently. The spark plugs were gapped too big by customer but I think the major problem is a timing chain that needs replaced but the customer declined... Trouble codes: 33 (MAP sensor).	23
	1998 Chevrolet Express 5.7L Poor Idle Quality, Surge, MIL Lamp on, low power Well thanks to all that replied. We got the van fixed. I Drilled holes in the exhaust to make sure the converters are not pluged, it made no difference. Ended up puting in a new MAF and it runs alot better. The engine load is still low but we have a converte... Trouble codes: P1153 (bank 2 sesnor1 not switching).	14
	1999 Chevrolet Malibu 2.4L MIL Lamp on Replaced ignition lock cylinder and IAC, it has now been a week and a half, customer got emmission test done, and the light is not on. Thankyou very much for all of your posts, they were instrumental in my diagnosis of this vehicle. Trouble codes: p2965 (key in ignition fault), p0507 (Idle control system problem).	9
	2001 Chevrolet Silverado 6.6L Mechanical Thanks to everyones replies.We installed a new gm reman.We lost line pressue all together after further diagnosis.After speaking to reputable trans shop we found that the pumps do disintegrate & torque convertors on these,especially the first year they came ou...	8
	2003 Chevrolet Impala 3.4L No Start The problem was the after market radio when we unplugged it would let the programing work also we had a bad BCM (dealer)	6
	2005 Chevrolet Express 6.0L Poor Idle Quality, Hesitation, Surge, Misfire, MIL Lamp on Thanks to all who replied did not want to post fix until vehicle went for a few weeks with no problems. Seems that the dealer may have been in the right area but wrong fix. They first replace injector 6 and problem was gone for a week or so then they replaced ... Trouble codes: p0103 (mass airflow circuit high), p0174 (system lean bank 2), p0300 (random missfire), p0356 (ignition coil f primary circuit).	9
	2006 Chevrolet Cab & Chassis Silverado 6.6L No Start well it runs again, I would like to thank all the replies, John and Brian for the extra help and Larry for assuring me the pump will come out of there with some wiggling. We found out that the duramax hates water, the pump would not pump above 458psi, replaced...	5
	1998 Pontiac Firebird 3.8L evap core THANKS FOR ALL THE GREAT INFO , WHAT I FOUND WAS THE EVAP. CORE WAS PRODUCING BOTH COLD AND WARM AIR . ONCE I REMOVED THE HEATER CORE TO GAIN ACCESS TO THE EVAP, THE LOWER CORNER WAS ACTULLY BLOWING WARM TO HOT AIR . I GUESS THERE MUST BE A BLOCKAGE IN THE EVA...	9

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