'91 100q 5 injectors replaced - now car wont start

[Joshua Van Tol]

Christopher,

Something that happened to me a long time ago is nagging at my memory.
Since others have pointed out that this is a non-interference engine, the
problem basically has to be one of these things:

1.) The cam/crank timing is off. This could be caused by a broken keyway on
the crank gear. This isn't likely, but possible.
2.) You have debris from the injector shrouds caught in several intake
valves. This should eventually clear with extended cranking as the bits and
pieces get mashed up.
3.) Last but not least (this is the one that happened to me) the hydraulic
lifters could have bled down. This will result in the valves not opening.
When this happened to me, the car sat for a month with the nose up.
Something about this allowed the lifters to bleed down. I had to crank it
forever to get it to start, before it started, and for several minutes of
cranking it had no compression. Compression gradually returned, it fired on
a few cylinders, and then ran, with lots of lifter noise. It took 20
minutes or more to get the lifters re-primed. On that note, the car does
have oil in it right? Because if you drained it and forgot to replace it,
then there would be no oil to be pumped into the lifters to re-prime them.

My suggestion: Check the oil, make sure the battery is fully charged, and
crank the heck out of it, you should probably pull the fuel pump relay so
you don't foul the plugs. See if anything changes. If that doesn't work,
pull the valve cover, and see if the lifters are mushy, and report back to
the list.

I hope this is helpful to you. I really think this is a simple fix, as
others have opined.


On Wed, Jul 3, 2013 at 5:24 AM, Christopher Gharibo <cgharibo at usa.net>wrote:

> Huw,
>
> My mechanic wants the car to go away. No doubt.
>
> I am getting the car towed back to me and haven't given up. This was a
> great no-worry car for errands.
>
> I lack knowledge and experience re many of the suggestions. Nevertheless,
> I will go through many of the suggestions and report back with hopefully
> the culprit and the good news.
>
>
> Begin forwarded message:
>
> > From: quattro-request at audifans.com
> > Date: July 3, 2013, 12:03:56 AM EDT
> > To: quattro at audifans.com
> > Subject: quattro Digest, Vol 117, Issue 6
> > Reply-To: quattro at audifans.com
> >
> > Message: 5
> > Date: Tue, 02 Jul 2013 22:03:25 -0400
> > From: Huw Powell <audi at humanspeakers.com>
> > To: quattro at audifans.com
> > Subject: Re: '91 100q 5 injectors replaced - now car wont start
> > Message-ID: <51D3866D.4060003 at humanspeakers.com>
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> >
> >
> > On 7/2/2013 8:16 PM, Christopher Gharibo wrote:
> >> I am thinking about going through the injector installation and the
> >> suggestions again. This car was running little rough, stalling at idle,
> but
> >> otherwise running fine before it underwent the injector replacement.
> >>
> >> Can a poor seal between the injector-shroud or the shroud-engine cause
> loss of
> >> compression on a particular cylinder and loss of cranking cycle?
> >
> > No.
> >
> > Your mechanic is either incompetent or simply wants this car to go away.
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