HELP! biza gti engine trouble

[ibizadave]

my 95 ibiza gti is running really rough, it starts and then its making a kind of popping noise out the exhaust and when i rev it it will drop by itself, it seems to improve once its warmed up but still not right.

[DVR68U]

might be worth changing the coolant temp sensor , cheap part might be an easy fix . cheers

[Golf Loon]

Or vacuum leak. Check the intake boot and hose from the back of the throttle body.

[karmen]

spray electr leads with wd40 may help if no go yet

[Valver.]

If you've no joy with the coolant sensor, change the Digifant ECU Voltage Control Relay - #30 on the fuse box p/n 165 906 381. All dealers will have in stock at about $35 RRP. It's the central relay to the entire engine management system and a very common failure. Most common symptom is significant misfiring at around 3k RPM, but it will also cause a heap of other faults due to affecting the throttle position signal etc.