09-12-2007, 11:52 PM
i have the 10vt motor in my audi 4000q...
It is REALLY struggling starting COLD and i dont know who else to go for this problem other than my homies on audiworld...
It hasnt nearly gotten better. it takes about 8 or 10 tries before it actually gets completely started up... itll crank over forever and the voltage is fine now... but it just wont start up!
The vac lines looked okay i thought... however there is a small crack in the airbox...
09-12-2007, 11:53 PM
The odd thing is that...
1.) it runs FINE once its started. it warms up, stays warm... and runs really smooth and nice...
2.) once the motor is warm... i can turn it off and start it up easy... it doesnt struggle unless its cold!
whats the deal guys!?
a list of what to look for...?
09-13-2007, 08:14 AM
Huw's Audi Garage</a> lots of older Audi content
Post to wiring schematic</a>
Check the spare fuse</a>
Also I would try and check all your fuses. If I recall correctly, there are 3 fuses that run the engine management.
Might also be a coolant temp sensor too, but here's a start.
Search for hard starting in the 4000 forum. I went through this when I had my 4000 but I can't recall what it was.
09-13-2007, 09:05 AM
It's controlled by a temp sensor on back of head that tells it to squirt for a few seconds during cold start. You could try a test light on the wire when cranking to see if it's getting voltage. If so, pull that injector, bag it and see if it actually sprays. It doesn't run continuously, just a short shot to get the motor going. Good place to start looking anyway. BTW, my bro has a 'just wrecked' 4k 10vt he may part out.
09-13-2007, 07:05 PM
im interested in the 4000.. id love to look for some parts :)
its probably the cold start injector... so just yank it out of the intake manifold and put a plastic bag around it and try starting the car?
so if the injector doesn't squirt is it most likely needing a new injector?
if only i had a test light with me!!! :/
jeff... thanks a ton for the help.
09-13-2007, 07:30 PM
I need to get me a set of those
09-13-2007, 10:23 PM
as my non turbo. I'll also see if he's decided to part it or not. And yes I agree... those wheels are teh hotness on yur 4k.
09-13-2007, 10:51 PM
see if he has a k26 or k24... i really could use either.
poss. a new airbox (the plastic piece that the igloo TIP thing and also all the fuel lines go to...)im quite sure mine has a crack in it.
and of course... anything aftermarket im interested in.
let me know
09-13-2007, 10:57 PM
is an awesome technical reference for the 4k's and coupes.
Scott Mockery's site, whos URL escapes me, is awesome for the turbo engines.
09-15-2007, 07:47 AM
"Cold Start Valve
This is an often maligned, very rarely bad part of your fuel system. It is always the first suspect in poor cold starting situations, due mostly to its name. What does it actually do? For a few seconds when you first turn the key (depending on how cold it is under the hood), fuel is sprayed through this "sixth" injector (well, we call it that in the five cylinder engine) into the intake manifold. This makes the mixture nice and rich for a moment, which helps get those first few sparks to make explosions.
There are fairly simple test procedures outlined for them in the Bentley shop manuals, which I am not going to duplicate here. if your car is not starting well in the cold, 99% of the time it won't be the CSV itself. Once in a while the sytem that triggers it will fail to operate properly, but the problem will usually be elsewhere even in that case.
The CSV does so little... it is an electrical injector that has constant power (12v). When the engine is cold it is grounded while cranking through the thermo time switch, and of course sprays a little extra fuel. On some cars, it is also grounded intermittently while cranking by the hot start pulse relay, adding a bit of extra fuel during warm starts.
It can be triggered manually also.
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I've never, ever, ever, had a bad Cold Start Injector. Plenty of hard starting conditions, but never a CSV/CSI.
Thanks to it's name, everyone always thinks it should be the problem.