2.0 GT5 cold start problems

splittie67 · 14-06-09, 09:30 PM

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?

msh · 15-06-09, 02:05 AM

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

Anyway, if u wanna just rise iddle, use adjustment screw, must be somewhere on throttle body.

vag80 · 15-06-09, 05:32 PM

is it carb or injection

splittie67 · 15-06-09, 05:42 PM

injection

vag80 · 15-06-09, 05:58 PM

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

4v6 · 15-06-09, 06:03 PM

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

15-06-09, 05:32 PM	#3
vag80 Senior Member Classic Audi Club Member Join Date: Oct 2008 Location: Bracknell Posts: 1,967	is it carb or injection __________________ nothing like a bit of deep dish 200k club member 87-b3 80 83-4000 2 door

15-06-09, 05:58 PM	#5
vag80 Senior Member Classic Audi Club Member Join Date: Oct 2008 Location: Bracknell Posts: 1,967	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 __________________ nothing like a bit of deep dish 200k club member 87-b3 80 83-4000 2 door

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15-06-09, 02:05 AM	#2
msh 4 ring whore! Join Date: Jun 2008 Location: Rucava, Latvija Posts: 3,816	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 Anyway, if u wanna just rise iddle, use adjustment screw, must be somewhere on throttle body.

15-06-09, 05:42 PM	#4
splittie67 Newbie! Join Date: May 2009 Posts: 8	injection

15-06-09, 06:03 PM	#6
4v6 Ex Member Classic Audi Club Member Join Date: Dec 2007 Posts: 5,565	Check the injector seals arent split as well as any of the vacuum hoses, the big one from air meter to throttle body etc.