2.0 GT5 cold start problems
 

hi - im a newbie to the forum having just purchased retrorejects old car
http://www.classic-audi.co.uk/forum/...ead.php?t=5067
and I could do with some advice. overall im pleased with the condition of the car and it drove fine back from dorset to cornwall, engine very strong and pulls really well (and souds great!!!) only problem (so far!) is that on cold start it has quite a bad misfire for the first 5 minutes or so right through the rev range. once the engine is warmed up this disappears and runs fine, although the idle is very low and intermittently cuts out as a result. ive checked through the history and its had new rotor arm dizzie cap plugs and leads recently, and in general has been well serviced throughout its life and only at 116k miles at the moment. any suggestions on what to look for? is it possible that it juns needs the idle set and a good tune or is it likely to be an irritating electrical gremlin? :confused:

No, it's more likely that your nozzles are spraying fuel very poorly, when engine is hot, heat helps fuel to vaporise, minimizing the problem :) And/or your fuel pressure regulator doesn't do it's job correctly, forgot, what happens, when it's out - mixture too rich when hot or too lean when cold - I'll find it out today.

P.S. There is also possibility that iddle control unit isn't working properly :D Anyway, if u wanna just rise iddle, use adjustment screw, must be somewhere on throttle body.

is it carb or injection

injection

you can ajust the idle on the throttle body it may be the cold start thats playing up it looks like an injector by the throttle body on top of the in let manifold you may get away with cleaning it

Check the injector seals arent split as well as any of the vacuum hoses, the big one from air meter to throttle body etc.