Hi all,
Got a mk1 gti and it has a strange cold start problem, If the car is left for 3 or 4 hrs it takes a lot of cranking to start the car, it starts first time but take a good 5 or 6 seconds to get going , and after that it fires perfectly, if you start it again quickly. But if I leave the car two days , it fires first time. have check cold start regulator , aux start valve and
Excessively rich idle mixture or faulty engine temperature sensor are possibilities.
Dave Baker - Puma Race Engines
thanks, BTW you got a top site for car information.
My first thought was a faulty pressure accumulator, but this would lead to excess cranking at any re start after 3-4 hrs- i.e. when pressure has subsided after some time span.
Sounds like you have either leaking injector seals, causing loss of vacuum and thus not lifting the air flow plate from rest- but it would start fine if you applied even just alittle throttle, or you have a dribbling cold start injector which is basically flooding the luke warm engine- but fine on a totally cold one. Isolate it from its fuel supply by way of a check.
Tim..
Could also be leaky injectors.
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