Mysterious Misfire

RAB

Technical Specialist 1.2 TDI
For weeks I've been trying to get my Lupo 3L ready for an MOT after replacing the head gasket. Booked an MOT, took it for a test drive on the way to the garage and it would misfire, so I would bring the car home and cancel the test. This happened three times. No fault codes. This week I changed the injector loom but that didn't make any difference. This morning I decided to give it a compression test, hoping that I would not have to remove the head again. Went to loosen the glow plugs and they were all loose! I must have done a compression test previously which decided cylinder head removal and then simply hand fitted the glow plugs for safe keeping.

I'll have to give my mechanic his P45. Oh, wait a minute......

RAB
 

audifan

A2OC Donor
Problem found and at least it will be running better now, unless you swapped to petrol to take advantage of the lower compression.:)
 

RAB

Technical Specialist 1.2 TDI
Problem found and at least it will be running better now, unless you swapped to petrol to take advantage of the lower compression.:)
The CR is only 16:1, so not far above a petrol. Even with loose glow plugs, it idled surprisingly well!

RAB
 

Howey

Member
Supprised you couldnt hear the compression excaping from the glow plugs but cant say i have ever tested this theory!
 
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