How old is the cap, rotor, plugs, and wires???
Nick
How old is the cap, rotor, plugs, and wires???
Nick
Just a wild-assed-guess on my part, but it seems to me from the conditions that you describe, that an intake valve might be hanging open, that's the only thing that would cause backfire thru the intake, and it would account for the rough running and bog. Can anyone shed any light on why a valve might hang open when engine's hot? Ed
backfire through the intake. Dont go and pull the heads off yet!
Brian,
When is the last time you did the following:
1) Tune-Up (Plugs, Wires, Cap and Rotor) 2) Checked Ignition Timing 3) Scanned the ECM for DTC's?Doc
Oh yes, try disconnecting that MSD for sure. The check engine light will come on if it has a TDC.
Brian,
When troubleshooting an ignition problem, step #1 in the GM service manual says (paraphrased) "disconnect all non-stock equipment before begining the diagnostic procedure."
So yeah, yank the MSD and see if she runs better.
Doc
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