Re: Wierd 4kq CIS Fuel Problem

[Huw Powell <human@nh.ultranet.com>]

>         Heres the deal.  car is 84' 4kq.  Wanted to move it to final
> resting plae for TUrbo onversion.  Injectors were pulled off at Cis Unit.
> Replaced injectors in proper order, car wont start.  Fiddle, still
> nothing.
>         Try pulling an injector to see if there is flow.  Nothing.
>   Try pulling Air Intake Hose above metering plate and pulling up
> plate on own.  Now I have fuel. Try starting car car moving plate on own
> and it starts fine.  Hey, I'm taking place of Mr. CIS :-)

actually you;re taking the place of Mr. Air Flow... that's what raises
the plate.

>         Replace hose, car wont start.  REpeat procedure.  Car only runs If
> I move plate or put starting fluid into motor.  So without my intervention
> car isn't getting Fuel.     WHY?  I checked all hoses for leaks.
> Everything appears fine. No gaping vacuum leaks.  Any Ideas on whats up?
>         Seems to me the metering plate os not lifting on its own.

looks like either:

1. as you say, plate is not moving.  Could be stuck, or there's a huge
air leak causing it not to get lifted. Does it seem to take much to lift
it by hand (Mr. Goodpliers)?  & time to check for huge airleaks.  Well,
ones big enough to provide the starting intake vacuum with a source
other than the air plate.

2. at it's lowest position and maybe the first few mm of lifting it's
not letting any fuel through yet?  i dunno, that's unlikely.  I wonder
how the cranking engine is normally supposed to lift the plate?  Because
if the mixture adjustment is so lean that in that lift range no fuel, or
not enough fuel, is present, your problem would arise.

3. Oh, could your airfilter, intake tubes be clogged?  No, you say
starting fluid will start it.  following that, will the engine keep
running, say if you keep it revved up?  If so, air is certainly getting
through there and causing fuel to flow.

I'm just guessing here... no btdt.
-- 
Huw Powell

http://www.thebook.com/human-speakers

82 Audi Coupe; 85 Coupe GT
http://www.nh.ultranet.com/~human