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1989 Chevy pinging problem

Discussion in '1992-Present Chevy & GMC models' started by froggy81500, Apr 11, 2002.

  1. froggy81500

    froggy81500 Newbie

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    I've got a 1989 Chevy C1500. It's got a 4.3L V-6 and a 5 speed with 213,000+ miles on it. Yeah, I hear you V-8 guys laughing about a V-6. Anyway, here's the problem. When I set the timing to specs, 0 degrees TDC, when I step on it or go up hills, it pings really bad. It seems like the ignition advances too far. I've got the timing retarded to about 6 to 8 degrees ATDC and I've got the pinging under control, but its a little sluggish. I don't think its a problem with carbon build-up in the cylinders since the head gaskets were replaced at about 150,000 miles, before I bought the truck. I've replaced the MAP, IAC, O2, CTS, Knock Sensor, EGR Valve and solenoid, timing chain(about 30,000 miles ago) and the fuel pressure regulator. There's no sign of a vacuum leak and it isn't overheating. Also the regular tune-up stuff-cap, rotor, wires, fuel filter, ect. I've even gone to one heat range cooler on the plugs but no dice. This thing almost sounds like a diesel. I've tried different octane gas and no change there either. I checked under the control module and noticed that there wasn't much grease left under it so I wonder if the module could be bad. But everyone I've talked to tell me that modules usually just quit. Is that the case, or could it be malfunctioning. I might be able to get my hands on another to test that theory but I gotta break into my friend's car to get it while he's in jail! So if there's anyone out there with any suggestions(other than getting a new truck or a V-8), or if someone could tell me if modules quit altogether or can m they start having problems, please let me know 'cause this pinging is driving me nuts.
     
  2. HDFXB

    HDFXB Registered Member

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    Might try checking the wiring from the knock sensor to the module. My 92 has a broken connector that comes off once and a while, and it will ping like you describe. It doesn't flag a check engine light either.
     
  3. froggy81500

    froggy81500 Newbie

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    I already checked the wires for the knock sensor and the Electronic spark control gizmo thats mounted on the intake. Everything tested good. I'm not entirely sure about the MAP sensor. I replaced it a couple of years ago just for the hell of it. Does anybody know a good way to test these things? I might be able to get one from a good running engine and swap it.
     

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