I have done a search on the forum and can't find anything as specific as this fault, unless I missed it. If that's the case please direct me.
Fault - cold start engine runs rough for 10 to 30 seconds then settles down and all is well.
If I unplug the maf sensor it's fine, I know what you're thinking but it's not the sensor. I bought a genuine used one, a genuine new one and even tried another from a working car, same result.....After the "alloted" time I can plug the sensor back in and all is fine, drives as expected. I've had pcv problems with other cars so I did replace this one, the old valve is okay - the blow and suck test.
There are no codes or engine lights. Tried both my cheapo reader and a decent launch one.
Car has had spark plugs recently during the service (fault was there before). No oil in the spark plug wells. Bought a used bosch coil pack and changed it on no. 1 cylinder. I thought about getting a new set of coil packs but don't want to end up spending a load of money on parts that are not needed. I don't expect a 'parts cannon' job to sort this out somehow.
Checked a few times for leaks and done the normal checking including cable checking for continuity and connector drag test. Engine not using any coolant, oil seems fine also. I putting in E5 BP Ultimate or Esso Synergy Supreme+ 99
As far as I know there's been no remapping - how would I tell anyway? The car has standard parts, no boy racer upgrades.
It just bugs me! I'd be most great full for any ideas on this one.......
