Hi All
New member here and looking for help ... got a VR6, '94, 88K miles, run perfectly for last 5 years but ...
- suddenly (after being stuck in traffic for 30 mins) started idling at 2500 revs, but running fine at normal motorway driving speeds
- checked the engine and the oil breather valve pipe had snapped, so replaced that but made no difference
- Googled and thought the coolant temp sensor the next likely culprit - changed it
Symptoms now:
- intermittently runs/idles/drive spot on
- starts well when cold - idles at 1500 revs for 3-4 mins and then drops to usual 750 ... after revving when warm, idle hunts a bit
- drives fine but intermittently lurches or loses power ... as though petrol mix too rich/starved of petrol
- can be hard to start when hot, and idle hunts
- possibly a bit of a petrol smell in boot?
- interestingly (?!) parked on a hill (engine at high point) and idle really struggled/lots of dying/really struggled to start
I'm no expert but checked for air/hose leaks; electrical connectors clean; main earth looks OK; fuses/relays firmly seated.
So went to local VW specialist who have diagnosed 3 engine temp faults. They say each sensor is working fine, so likely culprit is a dodgy ECU and have sent it away to be tested. I'm slightly apprehensive after searching the forum that the ecu has failed and wonder at a dodgy connection/electrical earth/fuel prob etc.
So, do ecu's really play up?
Thanks in advance
