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940T Rough Idle/Misfire on Cold Start 900 1994

posted by  Townshend Act on  Tue Aug 25 11:49 CST 2020
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last visit: Tue Oct 7 22:44 CST 2014
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I am always encountering a very rough idle and/or misfire on first-of-the-day cold start up.
Pressing the accelerator slightly to 2,000 rpm for 7-10 seconds clears the malady, but leaves me wondering about leaking fuel injectors or head gasket. The B230FT is not using any coolant and the injectors have been swapped out with known good ones, but the problem persists. No vacuum leaks anywhere.
Seems like it is coming from the #4 cylinder, but spark plug condition and bore scope viewing show all is clear.
All secondary ignition (cap, rotor, wires and plugs) were replaced in a recent major tune.
Any advise folks?






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New 940T Rough Idle/Misfire on Cold Start [900][1994]
posted by  Townshend Act subscriber  on Tue Aug 25 11:49 CST 2020 >


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