iATN Member GM Auto Repair Tech Exchange for October 8, 2007

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Open Help Requests for GM

	Help Request	Answers
	2003 Buick Regal 3.8L 1-2 shift Intermittently, usually once in the morning will slam into 1st gear when taking off from the first stop of the day. May do it more than once or it won't do it at all. Does this tranny need a rebuild or is it something simpler. I'm not a tranny expert and this ...	View
	1991 Cadillac Eldorado 4.9L Excessive Emissions, Poor Idle Quality, Misfire Car towed in as a no start. Severely flooded. Plugs fouled, gas in oil. No data available on scanner, not sure why. Checked for codes in climate control on board system & got code for shorted map. Replaced plugs, map & changed oil. Car started right up. Runs g...	View
	1996 Cadillac DeVille 4.6L input speed sensor I am a tech at a Ford dealership. This vehicle belongs to our parts manager. I found a pretty good write up on the internet about this code and how to replace the input speed sensor. I told the parts manager that I didn't want to tackle the job. My question is...	View
	1990 Chevrolet Pickup 5.7L idler arm Just want to pick your brain, We have this pickup that keeps coming back to us about every 90 days with a bad idler arm, these arms are Moog Problem Solver idler arms, and moog has been so nice to warranty them out for us every time. It is back with the same p...	View
	1997 Chevrolet Lumina 3.1L dashlights Hey everyone, I have a 1997 Chev. Lumina with auto lights. Sometimes the dashlights do not work. However, if you turn the switch half way on it will work. Also if you bypass the switch with a power probe it will also trun the lights on. I have replaced the lig...	View
	1999 Chevrolet Lumina 3.1L Misfire Gme techs, I have a good one here. Car came in and other shops replaced both crank sensors and ignition module with no change. What this thing is doing is when cold it will start and idle fine, but anything over 1500-2000 RPM it begins cutting out and misfirin...	View
	2000 Chevrolet Express 5.7L No Start i have a g1500 van in the shop that has gone through 3 fuel pumps in 1 1/2 years it has the new connector installed. the tank looked clean on the inside and did not see any debris on the pump.the fuel pump is an (airtex) has anyone had a proplem with this bran...	View
	2002 Chevrolet Impala 3.8L Misfire Car was serviced and found to missing. pulled spark plugs and found was worn out. replaced plugs, and road tested. misfire p0300 then p0303. replaced spark plug wires and test drove again. Did some better but under hard acceleration misfiring and and no power.... Trouble codes: p0301 (cylinder 1 misfire), p0300 (multi cylinder misfire), p0303 (cylinder 3 misfire), p0300 (multi cylinder misfire).	View
	2005 Chevrolet Impala 3.8L instrument illumination all dash lights are inoperative including radio display. bcm code b2665 - parking light circuit high. has anyone run into this before? repair track seems to lead to bcm replacement. prdl also comes on briefly and goes out in about 2 seconds. i have replaced se...	View
	2001 Geo Tracker 2.5L Poor Idle Quality Hello: This V6 Tracker has us a bit flumoxed with a poor idle. It is rough and stumbly and feels a lot like restricted injectors at idle. Seems to respond to throttle ok, just doesn't idle well, especially after cold start. Idle speed motor responding to A/C i...	View
	1993 Oldsmobile Cutlass Ciera 3.3L Ignition Vehicle was towed in about 3 months ago and would not start. At that time it had no fuel pressure so I replaced the pump. Car ran fine... One week later customer called and said the car would not start, Again. So, I went to his work and found that his starter ...	View
	2001 Pontiac Grand Am 2.4L Poor Idle Quality, MIL Lamp on See the related repair history on this high idle issue. Trouble codes: P0122 (tp sensor circuit low voltage), P0133 (os2 slow response sensor1).	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Buick LeSabre 3.8L blower motor Final fix for this vehicle was a bad crank position sensor and a bad wire int the control module for the heater.	39
	1995 Buick Park Avenue 3.8L Air Distribution Well I didnt fix it the way I wanted to but! I had it to two different GM dealers on their Tech II and they could not find any problem. What I ended up doing was to switch the 5 and 6 wires on the pass side temp actuator. Problem solved. i have no idea what co...	3
	1997 Buick Park Avenue 3.8L Misfire I replaced the harmonic balancer and ckp and cmp and it did not fix the problem. I had to play with the mount at the waterpump to get the viberation to go away. Thanks for all the help.	15
	1989 Chevrolet Pickup 5.0L clutch thanks everyone for your input turns out i was thinking of the newer style throwout bearing that has the spring built in this one dose not have one after looking a little further at it i did find the fork wore out and i took a mighty vac to the bleeder this to...	26
	1995 Chevrolet S10 Pickup 4.3L Surge, Misfire Sorry for the delay in closing this but i wanted to be sure of the fix.All of the replies were helpfull and infomative.I checked the fuel presure to make sure it didnt bleed down-it held fine-this fix ended up being in the distributor-it was off just enough to...	8
	2002 Chevrolet Express 5.7L overheated exhaust ALL OF YOUR ANSWERS WERE THOUGHT PROVOKING. I HAD A HARD TIME BELIEVING SUCH A SMALL AMOUNT OF BACK PRESSURE [1PSI] COULD BE THE CAUSE. WE RIPPED APART THE MUFFLER AND IT WAS OK, BUT IT HAD CONVERTER TYPE SHINEY MATERIAL IN IT. THE ONLY EXHAUST WE COULD FIND T...	6
	2005 Chevrolet Suburban 5.3L abs Thanks for all the suggestions it did turn out to be the ECBM. It has been two weeks and still no problems.I did not have the car here in the shop for myself to repair so I cant give any test results.It was fixed by his dealer under warranty. Thanks again!	9
	2006 Chevrolet Cobalt 2.2L Misfire, MIL Lamp on Thanks to all who replied. The customer had an extended warranty and decided to return to the dealer after being informed of the recalls on the injectors. Once again, thanks to all who took the time to reply and I appoligize for the delay...I was hoping to hea... Trouble codes: P0300 (testing and results).	9
	1995 Oldsmobile Achieva 2.3L interior lights Thanks to all who offered advice on this one. This car was very misleading. After checking (several times over) power, ground, inputs and outputs of the alarm module I found no obvious concerns that would let the smoke out. I did find a rear door jamb switch s...	3
	1997 Oldsmobile LSS 3.8L fuel gauge I want to thank everyone for their replies. The problem was definetely the sending unit. Replaced the sending unit and problem solved. Thanks again	3
	1990 Pontiac 6000 3.1L Fuel Injection As had been suggested I checked the resistance at the plug and both banks came up odd (3.8ohms and 2.8ohms) so I removed the plenum and ohmed the injectors directly, I found three bad injectors and one marginal. I replaced the injectors and the car runs fine. ...	14
	1996 Saturn SL2 1.9L Misfire, tach cuts out Turns out that the vehicle had the battery replaced (before we got it). At some point the old battery leaked acid, which dripped off the battery tray and into the main wiring loom below. The acid compromised the insulation on the wiring, causing all the prob... Trouble codes: p0336 (crankshaft position sensor erratic operation).	7

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