Hello,

My 1995 1.8i Golf Mk3 (Eng ADZ), is failing its emissions at high idle.

The printout result was as follows:

Eng oil temp during test 69C ( low, I know, as the car was waiting some time for the test and I don't think that they even let it warm up properly)

Low Idle (880rpm)
CO 0.14 vol %
HC 30.00ppm

High Idle (2920rpm)
Lambda 1.01
CO 0.38 vol% FAIL( due above 0.3% limit)
HC 18.00ppm

The cat. was replaced last year, so hopefully it is not a repeat defect, as it was very expensive. I have just replaced the coolant temp sensor and the air filter. I have spoken to a local mechanic and he has suggested putting a fuel injector cleaner into the fuel tank and giving it a "good thrash" before I put it in again for a retest of the emissions.

Does anybody have experience of a similar problem at high idle and if so did a fuel treatment cure it ??? If it did what injector cleaner did you use ?

Thanks,

S.