iATN Member GM Auto Repair Tech Exchange for May 20, 2008

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Open Help Requests for GM

	Help Request	Answers
	1997 Buick Skylark 3.1L TCC, starts in second gear I need some assistance on this Buick, it sets a P0740 code and this causes it to start in second gear, it only blows the fuse as it is started, if you replace the fuse with the engine running it will start in first and shift all gears. I have disconnected the ...	View
	1999 Buick Park Avenue 3.8L trunk lock this car will unlatch trunk when you open any door with the handle or if you press any button on remote. it will only do this if it sets for 10-15 minutes. if you close trunk and reopen door within 10-15 minutes it is fine .scanned all modules no codes in any ...	View
	2003 Cadillac CTS 3.2L all door locks door locks intermittenly work with use of key fob or door switches, checked codes with tech 2 and requested door locks with tech 2 with same results, intermittenly working. iam thinking bad rim module, has any body else seen this problem, thanks for any help.	View
	1990 Chevrolet Celebrity 3.1L MIL Lamp on Hello to all. this celeberty has the check engine light on no codes, speedometer not working. checked vss at ecm and have ac voltage high and low.car seem to idle fast the cooling fan is running all the time, and car wont communicate with my scanner. i can sho...	View
	2000 Chevrolet Impala 3.4L coolant level coolant level low message always on, 12 volts at yellow/black and ground at black wires, changed out 3 new ac delco sensors, no difference, flushed out green coolant and put in dex-cool, no change, if i disconnect sensor light goes out, cooling system clean no...	View
	2001 Chevrolet Blazer 4.3L Misfire Vehicle misfire at idle. Off idle vehicle smooth out. Misfire is very sutle. Fuel pressure is within norm. Fuel Injecto balance test is pretty much even. Customer had replaced cap rotors ignition wire set. Spark looks fine. I can hear a slight tapping noise co... Trouble codes: P0303 (Misfire Cylinder 3).	View
	2003 Chevrolet TrailBlazer 4.2L Hesitation Came in with check engine & power reduction lights on. Had codes 1280 & 1271. Ran diagnostic charts & said to replace computer. We hooked lab scope up to sensor #2 for gas pedal(signal wire) & we get a "square wave" on the line. Sensor #1 does NOT get a square... Trouble codes: p1280 (Accelerator pedal position sensor 2 error), p1271 (Correlation code between 2 pedal pos. sensors).	View
	2004 Chevrolet Suburban 5.3L Hesitation, Misfire, MIL Lamp on this suburban has been here several times for this very intermitant problem.Owner states that misfires and mil flashes when trying to parralel park and sometimes when accel trying to merge on the hwy. sets a p0352 and a p0302 code every time. always in the sho... Trouble codes: p0352 (cyl 2 ign circuit), p0302 (cyl 2 misfire code).	View
	2005 Chevrolet C5500 6.6L Hesitation, Cuts out, MIL Lamp on replaced fuel injection pump,regulator,fuel rail pressure sensor and filter still setting code p1093. no fuel in oil.checked tank for sediment,sock and pick up are clear,no cracked lines. vacuum guage reads 10-11 in when code sets*** des [...]:act frp w...	View
	2005 Chevrolet Silverado 6.6L charging system Customer states battery not charging light on memory she reset,one time after battery light came on.Has not acted up since.We have never worked on a Duramax.Has anyone ever seen this intermittent problem?Very good customer.Thanks for all the input in advance. ...	View
	1976 Other GM loadstar1700 404CID No Start, Hesitation, Misfire hey everyone; i know i'm streching this a bit but its worth a shot. the reason i used the gm is there is no option for ih or other; sorry what i'm looking for is a wiring diagram of the ignition circuit. here is the info on the truck i have; 1976 intern...	View
	2002 Saturn L200 2.2L door locks,interior lights This saturn came on hook. Starts then dies in 2 seconds, also no door locks, no interior lights, trunk release inop, and security light NOT on at all. Scanner says u1000 code in pcm, will not communicate with bcm at all. Already have checked the wiring at rear...	View
	2005 Saturn Vue 2.2L MIL Lamp on, LOSS OF POWER Have a Saturn here that sets a p0068 correlation code suspect it has something to do with sensors out of range poss App sensor or Tac sensor I`ve had the car for three days and can`t duplicate the problem,but the cust. says the car won`t go over 20mph when the... Trouble codes: 0068 (mapmaf throttle correlation).	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Buick Regal 3.8L No Start, Intermittent Thanks everybody for your prompt responses to this Buick help request. Probably 15 of the 20 responses suggested I change out the crank sensor. A couple of responses pointed to the PCM, one suggested the ICM, which I had allready replaced, another brought up... Trouble codes: PO321 (Spark Reference Circuit), P1361 (Ignition Control Circuit).	20
	1996 Buick Riviera 3.8L Excessive Emissions, Stall removed and checked all injectors. found slow leak in two of the six. replaced injectors with new GM and havent seen vehicle back. thanks to everyone. IATN is the best tool in my shop!!	7
	2002 Buick Century 3.1L abs module Thanks for everyone's help. It turn out to be a bad $700 new part. What a waste of time. The only reason this one is out of here is because i got lucky and found a matching mod on one of our used cars threw it in and light when off and communication returned ....	4
	1999 Chevrolet Express 7.4L Poor Idle Quality Thanks for all the help I unpluged the o2 sensors and the truck ran great, as I pluged in o2 sensors one at a time, i found the car ran rough the weird part is the o2 sensor read the same with new sensors as old one, again thanks for all the help	7
	2001 Chevrolet Cavalier 2.4L transmission Sorry for the delayed response and closing of this request, but the problem went away by itself several days after posting the request. Obviously, the problem is intermittent, so we wanted to wait and see how long it would stay away, and to date, it has not r...	7
	2001 Chevrolet Impala 3.4L abs Thanks to all those who tried to help Dave from nevada and Alex from Georgia I believe nailed the problem. There is a TSB for a revised brake control module. We believe that is the problem because you can use either scanner to clear the abs code and it return...	11
	2002 GMC Yukon 4.8L MIL Lamp on, no acceleration at t The info was not specific enough but the help is extremely apprec. car left not repaired at this time and customer said he would return the next time it acted up! Trouble codes: p1221 (tps perf fuel pump circuit).	3
	1999 Oldsmobile Intrigue 3.5L engine Thanks for all the replies. I followed up with the customer and he says it has not acted up. After watching data on the scanner I realized that I was losing signal at the cam sensor. Replaced the new cam sensor and do not lose signal anymore. Thanks again ...	4
	1996 Saturn SL2 1.9L belt tensioner THANKS TO ALL THE RESPONSE SORRY THIS REQUEST WAS NOT CLOSED IT WAS THE TENSIONER I ORDERED A DEALER TENSIONER EVEN BEFORE POSTING A REQUEST FOR HELP I HAVE LEARNED MY LESSON ABOUT AFTER MARKET TENSIONERS AGAIN THANK YOU	12

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