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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 13, 2010
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Open Help Requests for GM
Help Request Answers
1997 Cadillac Eldorado 4.6L Poor Idle Quality VIN: 1G6ET1291V
This car will intermittently idle high 2,500 rpms, seems to be dashpotting. Iac counts are high 150 plus. Scanner shows 1% throttle and not at idle when its acting up. Tps voltage is .53 all the time at idle. This thing is very intermittent may go a month with...
2006 Cadillac CTS 3.6L wiper washers VIN: 1G6DPS7756
this is my friends fathers car, whenever he puts the wipers on low, or high the washer squirters start squirting till the tank is totally dry and keeps running...when he turns the wipers off the washer motor stops...I installed a new wiper switch from gm and s...
1991 Chevrolet C2500 Silverado 6.2L 3-4 shift VIN: 1GBHR33J5M
This was a hard starting problem so the scanner showed code 22 tps low. I replaced the tps with AC parts and the starting part was fixed. But now I have a trans shift problem. All upshifts are fine and then after a short distance it will downshift from 4 to 3 ...
1993 Chevrolet K1500 Silverado 5.7L steering VIN: 1GCEK19R3V
This truck has been around the shop and ended up in my bay. I have searched the archives and found some very good info. but not enough to fix this one. Like many chevy trucks (I love chevy trucks) this one steers hard. At first I was told at idle and low speed...
1993 Chevrolet Cavalier VL 2.2L Poor Idle Quality, Stall VIN: 1G1JC1440P
Engine will stall with map sensor plugged in, unplug sensor and it will idle fine. Still has a miss on cylinder 1. Good spark, have not checked injector yet, but not really concerened there. Thanks in advance for the help.
1994 Chevrolet Lumina Euro 3.1L Poor Idle Quality VIN: 2G1WN59T5R
Simple 3.1l will not idle but runs great down highway until you come to a stop then it lopes, chugs, almost will stall but never does. Touch gas lightly and it takes right off. Compression test, replaced injectors, pcm, iac, o2, map, tps, fuel filter. Help ple... Trouble codes: 35 (Iac)
1995 Chevrolet C1500 5.0L Hesitation, Cuts out, Stall VIN: 1GCEC14HXS
truck cuts out as soon as you give more than 1/4 throttle.acts as if key shut off.voltage good at coil at all times.have replaced distributor and also tried delco pick-up coil and module in new distributor.only problem noticed on scan data is tps moves slowly ...
2000 Chevrolet Lumina 3.1L Takeoff from stop VIN: 2G1WL52J0Y
I think I just walked into a job that I shouldn't have.. Just the standard issue 2000 Chev Lumina with the 3100 and 4T65E transmission. Replaced the transmission due to multiple error codes and such and transmission component slippage--probably worn valve bod...
2000 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS1451Y
Happy Monday IATN members. I have a problem with this S-10 that wont reach operating temp. It gets to 153 then starts droping down to 140. I have replaced the thermostat twice. I even put a ECT sensor but that was no help. The thermostat was a stant 195F. T... Trouble codes: P0128
2000 Chevrolet Silverado 1500 LS 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2GCEC19TOY
Hello guys this one is my personal PLEASE HELP I haven't had the time to do much fuel pressure seams good replaced fuel filter the skip seem to be mostly on. # seven cyl I have swapped plugs coils and wires problem seems to stay on #7 I ran techron through it ... Trouble codes: P0300, P0307
2004 Chevrolet Tahoe LT 5.3L tracshon control VIN: 1GNEK1Z64J
Hi Have this Tahoe that has been on and off acting up for 6 to 8 months now of course it has never acted up for me the customer is complaining of interment traction activation on dry roads and under normal driving has set no codes in any module I have a tec 2 ...
2004 Chevrolet Silverado 1500 4.8L Readiness Monitors VIN: 2GCEK19V94
Hello fellow Techs, Got a head scratcher here. All I/M readiness monitors reset on their own as soon as the key is cycled OFF to ON. Since PA is an Emmissions State, this truck won't pass the OBDII portion of the test. As I shortly found out that this vehicle...
2005 Chevrolet SSR 6.0L Cooling Systems VIN: 1FDWE35L54
VIN not available, sorry. Vehicle runs at appx 190-195 degrees when moving. At idle at stop for over 3 minutes, gets hot, nearly overheats. Customer will bring vehicle to the shop next week, has been to dealer twice, boss is considering buying, any upfront ide...
2006 Chevrolet Uplander LS 3.5L Cables VIN: 1GNDV33L56
Hello and thanks for taking the time to read this. I have already wrecked on power door module and am working on the second new one. The extremely difficult job of replacing and adjusting the power sliding door module and motor assembly is not cooperating. I a...
2006 Chevrolet Uplander LS 3.5L No Start, Stall VIN: 1GNDV23L86
This vehicle will start and run then die and not crank. Let it sit a few minutes and it will restart. When it dies it sets P0601, P0606 and U0107. Engine temperature does not appear to be a factor. Thank you Trouble codes: P, 0601 (internal control module memory check sum error.), P, 0606 (PCM Processor Fault), P, 0748 (Pressure control solenoid circuit malfunction open circuit/short to ground or power supply), U, 0107 (Lost comm. with throttle control module)
2006 Chevrolet Silverado 2500 HD LS 6.0L MIL Lamp on, reduced engine power VIN: 1GCHK24U56
we have replaced everything that has to do with the tac system. we have been fightin this problem for a long time. it sets the codes/code at random times. sometimes it will just set the code u0107. just started to set the p2108 and p1516 but the u0107 sets eve... Trouble codes: P1516, P2108, U0107
2009 Chevrolet Express 3500 6.6L Static spark from engine VIN: 1GB6G3A69A
We have a fleet of '09 Champion Para-Transit buses utilizing cut-away Chevy Express chassis w/Duramax 6.6L diesel engines. On two of these vehicles, we are experiencing an intensive static discharge from the crankshaft pulley to the engine oil pan rail. Has an...
1998 GMC C3500 Sierra SL 6.5L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 1GDKC34F3W
Found fuel filter empty,replaced fuel pump relay and then the lift pump ran and filled the filter,truck runs and appears fixed,i then checked pump for power and ground,it was fine,checked with scope and the pump feels and sounds like it is pulsing? the scope p...
2005 GMC Safari 4.3L No Start, Stall, start and stall VIN: 1GTDM19X05
a week later van comes back in on hook with no start. check fuel pressure perfect 62 - 58 .check timing number one tdc perfect distributor lined up perfect pulled crank sensor checked reluctor ring good replaced crank sensor ,checked distributor gear good repl...
2001 Oldsmobile Alero GL 2.4L Stall VIN: 1G3NL52T31
Starts fine cold ,while on high idle ,,ok ... After warm up idle comes down , stalls , if i hold idle above approx, 1100 rpm ,runs ok ,, seems like bad iac motor , took out iac, cleaned pintle, cleaned hole , cleaned thottle plates, ,,,thanks in advance iatn..... Trouble codes: P0336 (Ckp sensor)
2000 Saturn LW2 3.0L Excessive Emissions, Stall, MIL Lamp on VIN: 1G8JW82R9Y
Car came in with stalling problem and above codes were detected with scan tool. Upstream o2 sensors stay at 900mv at all times, even if i create a vacuum leak. Downstream sensors voltage normal but wont go into closed loop. Now wondering if the computer may be... Trouble codes: P0172, P0175, P0101, P0136, P0156

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Park Avenue Ultra 3.8L starts and dies VIN: 1G4CU5219S
Thanks to everyone who helped with this request. I built the signal generator with the 555 timer and diagram from the internet. When I tested it it was producing a 25hz square wave from 0 to 12 volts. I doubled the resistor value to the trigger on the 555 and ... Trouble codes: P1626, P1629.
1997 Cadillac DeVille 4.6L Engine VIN: 1G6KS52Y3V
thanks to everyone. as it turns out, the timing (cams) was off special thanks to juan in ca. tne pictures told the whole story
1994 Chevrolet K1500 Silverado 5.7L Hard starting VIN: 2GCEK19K4R
You guys (fellow members) are the best in this auto business. I further tried to retrieve DTC was unable to. I wanted a quick fix because our shop was getting full, so I went sraight to coolant sensor like you guys said and as I watch tempertur it was very low...
2003 Chevrolet C5500 Kodiak C5C042 6.6L right steering knuckle VIN: 1GBE5F1103
Thanx to all that replied found one in new york now its the customers choice to buy or not.Thanx for all the help.Its greatly appreciated.
1999 GMC K1500 Suburban SLT 5.7L Misfire, Loss of Power VIN: 1GK16R4XJ7
After some more playing around I had the fuel pressure gauge on while driving, no flutters or spikes when the issue would occur. I went back to the data stream with the scan tool and found that the bank 2 sensor 2 oxygen sensor was acting rather strange with v... Trouble codes: P0430 (Catalyst Bank 2).
2001 GMC Sierra 1500 SL 4.3L abs VIN: 1GTEL14W61
Thank you every one for your help. You were all correct with diacnostic information. I put on a new ebcm and all is well. Thanks again every one.
2005 GMC Sierra 2500 HD SLT 6.0L MIL Lamp on VIN: 1GTHK23U15
Hi everybody. First I would like to thank everybody that replied to my help request. Roger [...] all said replace the wiring harness to the knock sensor, we had tested the wiring harness already and it showed no si... Trouble codes: P0332 (Knock sensor two voltage low/shorted).
1998 Pontiac Grand Prix GTP 3.8L abs VIN: 1G2WP5212W
Found that my tech left the ground wires to the engine from the main harness loose. THat resolved most of the codes that had us confused. Thanks again for all the elp.
2004 Pontiac Sunfire SE 2.2L Hesitation VIN: 1G2JB12F74
Thanks for all the replies, the customer declined to have repairs done as we suspect (from all the replies we received here) that the MAF is probably at fault and they believe they had this replace with a used unit somewhere else, so they are taking back to th...
2003 Saturn L300 3.0L MIL Lamp on VIN: 1G8JW54RX3
after replacing 2 maf sensor found out there is a specific part # to that vechile got rid of aftermarket part put that one in still had issues but this time came up p0606 ecm fault replaced ecm havent seen vechile in 3 weeks customer happy sorry for the late r... Trouble codes: P0102.
2003 Saturn L300 3.0L Hesitation, Surge, Stall, Misfire VIN: 1G8JW54R03
2006 Saturn Ion-2 2.2L ingition lock cylinder VIN: 1G8AJ55FX6
thanks for all the great feedback on this issue. it would seem that this issue is caused by a poorly designed part. our replacement cylinder was even worse than the one we removed with excessive clearance around spring plate making it almost impossible to stak...
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