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lupo gti rough running


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hi new on here im looking for any help!
i have a 02 lupo gti it has ran great for 2 years never any bother
started to burn oil valve seals
so had engine out head off sent away for skim new oil seals
i have put new piston rings new shells also. rebuilt engine new timing kit water pump
new clutch ht leads plugs so on and now after fitting it runs very rough!!

like its running on 3 everything looked at no vac leaks it keeps saying the manifold pressure sensor
got a new one today that was a genuine map sensor also no change still got that g71 code
all wiring good any help please??

Edited by s.turbos
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  • 4 weeks later...

pull the leads off one at a time

if theres one or more that don't make engine run any different then that's a good indication which cylinder the problem lies

if that doesn't make any difference then take plugs out they should all look the same,if theres one that's say covered in oil or looks a lot lighter than the other that could point to the faulty cylinder

none of that works do a compression test

smoke test to check for leaks

the list can go on and on

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