Passat X reg 1.8 petrol warm start problem

[dtjvw]

Hi

I've suffered intermittent warm start problems for the last year or so but it usually gets going after 2 or 3 attempts. Always starts first time from cold.

When warm, the starter turns over but it doesn't really try to start. Eventually, it may stutter a bit before starting but in the last week, I've been stuck twice. It just didn;'t start at all until I left it for 30 minutes or so then tried again.

Also noticed on a couple of occasions when it did start that the idle speed was very high at 2000-2500 revs.

Local garage just replaced the temp sensor but no luck. They also ran some diagnostics but no codes were logged.

Anyone have any other suggestions?

Thanks

Derek

[bernie]

Hi Derek,

No solution, I'm afraid, but I have an almost exact same problem with my X-plate Passat (1.8T petrol engine). It start fine when cold or if it's been running for a good while. But if I run for ~10 min. or so from cold the engine coolant shows 90C BUT it's *always* very difficult to restart. I have no warning lights, or messages (e.g., Check engine). I can usually start eventually with the petrol pedal on full.

I haven't noticed the engine idling too fast, though. I haven't had the car into the garage yet, and your posting makes me the more cautious! It's been well maintained, but I've had this problem for a few months.

Many thanks for your thoughts,
Mike

[bernie]

Hi All,

Just to say that this problem was fixed by replacing the coolant temperature sensor (PN 059919501A) and an O-ring (N90316802) for my Passat/1.8T engine.

Thanks,
Mike

[md1980]

i had the same problem on mine afew weeks back and i had it on vagcom it told me the temp sensor had an intermitant fault i changed mine cost £21 from vw its been right since the guy at vw told me the temp sensor sends signs to the ecu i think it over fuels when it would'nt start causing it to flood the engine cos it telling the ecu it cold when its not

[JHT]

Crankshaft position sensors fail in this way. I am not sure on passats, but I had a polo with this problem and changing the crank shaft position sensor solved it. Also common failure with the same symptoms on other makes too.