dodge 2.2 turbo II odd efi problem, intermittent rich condi

[Evert Rosseel]

> I think that the intermittent rich condition may have been confined to the
> #3 cylinder, which may have washed the oil from the cylinder wall, causing
> the wear, and the bad leakdown.
> 
> I am not sure which cam lobes were getting flattened.
> Could a flattened cam lobe cause the intermittent rich condition?
> It looked like the top of the lobes had been flattened, which I would guess
> would be bad for high rpm use, but should be pretty harmless otherwise.
> I don't recall which lobes were flattened, but roughly 4 of the lobes
> were showing signs of wear. I can find out.

If one of the inlet cams has a flattened profile, the corresponding 
cylinder will run rich (less air admitted into this cylinder) and the 
others will run lean (overal stoichiometric condition for all 
cylinders together).
If excessive the engine will run on 3 cylinders (continuous misfire 
on one cylinder).

I have personally seen an engine with a cam lobe completely gone, 
which did still run on 3 of the 4 cylinders.

The intermittent effect may be caused by the lambda control system.

Evert
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*    Dr. ir. Evert Rosseel                                             *
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