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Showing results for tags 'no codes'.
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I have a stumble only at idle or when first accelerating from a stop, the engine rpm will stay around 500 then dip for a second to maybe 300-400 it isn't consistent and sometimes feels worse than others, you can feel a slight stumble when you first leave a stop but after that it's fine, smooth and no lack of power. The MAF and throttle body have both been cleaned properly but neither made any difference. The engine has about 205k on it, the plugs have about 80k on them now. I'm not sure where to look next ? -
OK 2008 SILVERADO 5.3 NO ENGINE CODES BUT RANDOM REDUCE POWER KICKS IN, SHUT IT OFF WAIT FOR A MIN OR TWO CRANK UP AN GO . THOUGHT MY AFM (ACTIVE FUEL MANAGEMENT) WAS THIS TROUBLE SO RUN IN 3RD GEAR TO KEEP IT OUT OF THE AFM BUT NO DID IT AGAIN ,REPEAT OFF WAIT AN GO NOW KEEP IN MIND WITH A HIGH END SCANNER NO CODES POP UP OR CHECK ENGINE LIGHT COMES ON AT ALL JUST GOES TO REDUCE POWER MODE . HERE'S WHAT HAS BEEN DONE NEW ECM,CLEAN GROUNDS ON ENGINE ,REPLACE ENDS ON GROUNDS ,ADDED GROUND A 14AWG WIRE FROM BATTERY GROUND TO ALL ENGINE, BODY GROUNDS , CLEAN PEDAL TPS, AND CONNECTOR , THROTTLE BODY, AND CONNECTOR ,REPLACED OIL PRESSURE SENDING UNIT, IGNITION SWITCH,DID A RELEARN , CHECKED ALL THE WIRES PULLED THE LOOM OFF RELOOMED AN TAPE CHECK CRANK SENSOR AN CONNECTORS ...SO NOW IM AT A LOST IM READY TO SELL OR TRADE THIS THING. SO IF THERE IS SOMETHING IM MISSING OR HAVEN'T TRIED LET ME KNOW!!!!!!!!!!! THANKS
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hi , driving me crazy , 2002 gmc 2500hd , auto trans , 4wd , 6.0l , app 250,000 km , 4dr xcab , long box , factory 2" lift , . my ABS lamp is on , there are no codes , no speedometer , ABS lamp behaves normal , comes on , goes out , comes back on. originally had a vss code , so i installed a non gm vss , still the same , when i drive 1/4 block the park and brake light come on , they go out after restart and only come on when moving , no speedo , i sent the ABS module away to be repaired , twice , first time it came back it was the same but wouldn't recognize that i had unplugged the vss as a test , the module will recognize either front abs sensor wires disconected , code for them , and then recognize that i plug them back in , i checked the fuses , i took the wiring harness from the vss to the pcm and verified that the two wires from the vss are ok , everybody i ask says that it is impossible to have an ABS lamp on and no codes, the module repair man told me i had a cheap code reader so i had a professional shop reader diagnose the codes , ($ 200.00) same thing , ABS on , no codes available , driving test showed no output from vss , put the old original vss back in , same thing , i bought a used complete ABS unit yesterday , stripped the module off , plugged into my truck , the ABS lamp went off ,finally , truck running or shut off . so i went for a test drive , no speedo still , and then the ABS lamp came back on and the park/brake lamp too , no codes still , park/brake lamp off when restarted but ABS still illuminated . also replaced the vehicle battery , i'm working outside in canada and it's about 0F , not much fun with those little t20 module bolts.they want $750 canadian dollars at the GM local dealer for a new module . is it possible the ignition switch is haywire ? is there a vss speed buffer in this truck ? and will it hurt my trans to operate like this , it shifts hard like a race car , been 2 mos without using the truck , thanks , jim. i should also mention that i cleaned and verified the 2 ground points under the cab and the ground under the battery on the frame, ran jumpers from battery to engine, frame , firewall etc, no better, unplugged pcu and visually checked the pins for corrosion , truck was from british columbia and has minor corrosion , almost none, no road salt area , . we fixed a pontiac vibe that had no speedo , ABS lamp wasn't on , researched that the two front wheel sensors ran to the abs module to make the speedo work , no vss, we replaced the ABS module and all is working , i thought similar situation here but this truck has a vss, the vss wires run directly to the pcm . where they go next i don't know. i purchased a cd of a factory service manual , but it has 23,000 pages and no index that i could find , if i had the proper page numbers to search perhaps i could do more , so if you can give me the page numbers it would help a lot, also it's very slow to load as too much data .
