I have a 1998 Golf TDI Mk4 bought new and synthetic oil changed every 5000 miles. New air filter and fuel filter. Current done 64,000 miles and changed MAF at 52,000 (two years ago - not doing a big mileage).
Just checked pipes around the inlet manifold and everything looks OK. Last I looked inside the inlet manifold it had no more than a light coating and certainly not clogged up.
When MAF was last changed (genuine VW Part)there was a pronounced drop in performance, accelerating in particular. After changing it it drove like a new car.
Recently started pumping out excessive smoke from the rear exhaust when starting from cold, but clearing as it warmed up. Disconnected MAF and started from cold - no smoke at all. Reconnected MAF and still no smoke.
Reasonably confident fault lies with the MAF, or at least the signals it is giving to the Engine Management System. Have ordered a a new MAF.
Is this the right diagnosis?
On reflection it could be due entirely to a bad connection between the plug and socket of the leectrical connection, despite an electronic lubricant being used.
Just checked pipes around the inlet manifold and everything looks OK. Last I looked inside the inlet manifold it had no more than a light coating and certainly not clogged up.
When MAF was last changed (genuine VW Part)there was a pronounced drop in performance, accelerating in particular. After changing it it drove like a new car.
Recently started pumping out excessive smoke from the rear exhaust when starting from cold, but clearing as it warmed up. Disconnected MAF and started from cold - no smoke at all. Reconnected MAF and still no smoke.
Reasonably confident fault lies with the MAF, or at least the signals it is giving to the Engine Management System. Have ordered a a new MAF.
Is this the right diagnosis?
On reflection it could be due entirely to a bad connection between the plug and socket of the leectrical connection, despite an electronic lubricant being used.
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