Engine Shaking at Idle

Hi,

 I recommend that you do not loose yourself in such details as long as you obviously have a very wrong mixture or ignition timing.

OK. I am struggling to find a low cost CO/HC meter that I can just put onto or into the tailpipe. I guess very old units on ebay are no longer calibrated... seems everything now is O2 sensors that have to go near the engine and at an angle.

I have a scope so I am wondering what can be done with that and perhaps some simple electronics?

The problem I see for the mixture is that I don't have any adjustment options. Only six clicks left on the ECU knob. What else could I change to reduce richness?

Thanks, Andy

Hi Andy,

hectic actions will not help. You have to take a systematic approach. After you took ignition distributor apart it is a must to verify rpm and vacuum. Next you want to know your mixture status. If it is too lean or too rich, you have to try to compensate with rheostat. if it does not help, you have to search further. My checklis t is a guidance for you.

Thanks but I have already systematically gone through a large number of checks and I am running out of things to check. For example I know that a faulty T2 sensor can cause richness so I have checked that. Can you please look through my list and see if you can spot anything I have missed off that can cause rich running.

Note that everything on that list I did because it was already shaking and running rich.

Thanks! Andy

 

First tell me how rich please.

Hi Andy,
you tell us: "J7. The MPS I am testing with is not original to the car but it has it's plastic cover intact. "

Does this mean there is a different parts #. installed?

Any MPS will provide basic function to any car, but a false sensor will result in a false mixture.

Tell us the # of the item installed...

Regards
Norbert