Running on three cylinders

Tiny
ZUSEY02
  • MEMBER
  • 1996 VOLKSWAGEN POLO
  • 1.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 19,000 MILES
My car seems to running on three cylinders. Replaced coil pack, plugs, leads and cylinder four injector. I know it is cylinder four since when I take the plug leads off one by one cylinder four makes no difference. Could it be a blown head gasket or blocked throttle body? I notice that when the car is sat their idling the tick over slightly increases and decreases by its self.
Car does not have an ECU so cannot diagnose electronically.

Any help much appreciated.

Regards, Mike.
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Saturday, October 29th, 2016 AT 3:37 AM

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Tiny
JIS001
  • EXPERT
If you have a vacuum gauge then check your manifold vacuum. If needle bounces when you here the tick then you have a sticky valve and will need a valve job on the head. You may also want to do a compression test. Here is a link for misfire diagnoses.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

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Saturday, October 29th, 2016 AT 9:38 AM

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