OK I understand - test with the O2 signal wire disconnected so the ECM can't compensate. Will do. I will also use a water spray around the manifold in case there is a gasket leak or something.

My car has only 4 of the reader pins connected on the diag connector - pin 8 for the ECM and then pins for SRS (6), A/C (10) and the IR/convenience module (12). Pin 14 is empty.

The only other problem I have found with the car is low A/C refrigerant (so the aux fans don't come on at slow speed as the high pressure switch doesn't fire). This does mean I get the temp cycling up to 105C in crawling traffic but I'm getting a recharge with dye later this week to sort that one.

I will post back with what I find from the vac tests.

Thanks for your help.

__________________
Regards,

Steve

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1995 E320 Coupe (125.052 104.992 722.369)