5ktq electrical problems update (not fixed)

[Ameer Antar]

Can you see the voltage when yer at 3000+ RPM? If the voltage is the problem you should see the voltage drop then. I'm not sure I'd trust the onboard EFI voltage reading as much as a meter...

Those injectors are pretty big too. I wonder if you need a better set of power lines to provide for the large injectors. You might have to bypass the fuse panel connections altogether and see if voltage direct from the batt. or alt. lines will help. In any case I'd check for the voltage drop at speed first before splicing anything.

-Ameer

---Original Message---
From: "Cody Forbes" <cody at craincorporated.com>
To: "Eric" <eric_audi.ql at mindspring.com>
Cc: "Audifans Q-list" <quattro at audifans.com>
Subject: Re: 5ktq electrical problems update (not fixed)
Date: Wed, 24 Sep 2003 03:13:00 -0400

My EFI does have voltage correction correction. I am using slightly bigger
injectors on this one,  42lb/hr instead of 38lb/hr, but I'm positive its
ignition. If I turn on the lights with highbeams the car won't rev above
3000rpm wide open and it dumps black smoke and fills the area with fuel
smell. I do have the EFI set a bit on the rich side, but not THAT rich.

-Cody

----- Original Message -----
From: "Eric" <eric_audi.ql at mindspring.com>
To: "Cody Forbes" <cody at craincorporated.com>
Sent: Tuesday, September 23, 2003 7:28 PM
Subject: Re: 5ktq electrical problems update (not fixed)


>
> Cody Forbes wrote:
>
> >
> >
> >I have a feeling there is something wrong with the diagnostic system
here.
> >This is an EFI car, the CIS is sitting next to my toolbox a few rooms
away,
> >yet the car still throws no codes whatsoever. My first though was it
would
> >be a waste of time to check codes because it would throw a dozen "your
CIS
> >is broke" codes at me, but I finnally checked a few days ago it got a
4444
> >(ran it 3 times to be sure).
> >
> >
> >
> >
> >
>
> This may be way off base, but just a thought to add to the flood of
> thoughts from others.  Since this is EFI are you using injectors you
> have used before?  If they were large you might run into problems with
> not getting the flow you expect at lower battery voltages.  Some EFI
> systems actually correct your duty cycle vs battery voltage to
> compensate for this.
>
> A long shot I know.  Ignition sounds far more likely, but who knows...
>
> --
> Eric Sanborn
> '85 4ktq - 225k+
> '8X VW Race Rabbit - EFI
> '89 Honda CRX Si - 175k (Wife's car)
> '88 Chevy Suburban - 190k (Tow vehicle)
>
> http://www.mindspring.com/~robinsanborn/4000/
>
>
>
>


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