Re. Narrowing down my start issue (84 4kq)

[John Cody Forbes]

Check. The. Fuel. Pressures.

-Cody (mobile)

On Aug 15, 2010, at 4:22 PM, Johnny B <pre95 at live.com> wrote:

> 
> Well thanks for the great tip! I swapped the fuel pump relay for the fan relay from my ur-quattro and no change on start (though the fuel pump runs on a constant as you said it would, I let it run 3-4 seconds before trying to start, same symptoms. I put the fuel pump relay back in Huw!). Very frustrating to say the least... I'm, not really sure where to go from here regarding this start issue. If its not a lack of residual fuel pressure, and not a vacuum leak (just replaced all formed vacuum tubes & all cloth covered vac lines, checked the entire system over), and knowing it had this same issue prior to new injectors being installed (this problem carried over from before the engine rebuild, which included all gaskets, rings, cylinder head rebuild, and fuel injectors + seals).. where do I go from here? 
> 
> Starting to get discouraged... if you give it any throttle over a light touch of the gas pedal for the first minute (when cold) it bogs and wants to die. Does the same when hot but only for the first 8-10 seconds... Im thoroughly stumped. Car has great power through the RPM band, top & low end are fine, idle is always rock solid just shy of 1k, cannot source any vac leaks with the chemtool when warm or cold... not really sure what else to check. Once the start symptoms pass, the car is perfect.. it doesnt drive like it has any issues at all which just adds to my frustrations. 
> 
> Thanks guys, I'm not giving up hope but definitely understand why so many throw in the towel and go EFI. 
> 
> Johnny
> 
> 
> 
>> Date: Sat, 14 Aug 2010 23:59:06 -0400
>> From: audi at humanspeakers.com
>> To: benswann at verizon.net
>> Subject: Re: Re. Narrowing down my start issue (84 4kq)
>> CC: quattro at audifans.com; pre95 at live.com
>> 
>> 
>>> Anyway, for purposes of trouble-shooting in the indefinate future you probably should
>>> just keep a fan relay installed in place of the normal FP relay.
>> 
>> Keep in mind that this disables a critical safety feature - your fuel 
>> pump will keep running even if an accident kills your engine.
>> 
>> Also, you will have no overrev protection.
>> 
>> Just to keep in mind while playing this game.
>> 
>> -- 
>> Huw Powell
>> 
>> http://www.humanspeakers.com/audi
>> 
>> http://www.humanthoughts.org/
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>                         
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