Volkswagen Polo 1.0 1999 Reg. Slow Idle / Lumpy Tickover

Iggle Piggle | 14:54 Sat 13th Jul 2013 | Cars

2 Answers

Hey, I'm after some serious technical help here.
This car starts and runs but after 1 or 2 minutes running, the idle slows down to 750/800 rpm, and it runs lumpy enough to shake the whole car.
Rule out the following and what do we have left?
OK are - plugs, disi cap, rotor, ignition leads, injectors, no vacuum leaks, MAP sensor, ECU, throttle body (and re-aligned), fuel pressure ok.
No faults showing on the diagnostic computer.
*** stumped ***

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Zacs-Master

VWs of this age have an EGR valve which, if memory serves, directs hot exhaust air back into the engine to aid warming up on a cold start. These become dirty and can cause lumpy tick over.

Iggle Piggle

Question Author

ok, so it was a worn camshaft, not a five minute diagnosis ...

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