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

[Fred Munro]

Chris;

Which timing marks were checked? If you are checking the crankshaft pulley
mark and the cam pulley mark, that only means that the timing belt hasn't
jumped. The only marks that matter are the mark on the flywheel (for TDC)
and the cam pulley mark.
The crank pulley on these I5 engines has an integral key as part of the
casting. The cast key is not very robust and is only intended to locate the
pulley on the crank, not hold it in position. The pulley is held in place by
the tremendous torque on the crank bolt (around 330 ft.lbs if I recall
correctly). If the bolt loosens off or isn't torqued enough, the crank
pulley can rotate on the crank and will shear off the key. The timing marks
on the crank pulley and the cam pulley will still line up if the timing belt
hasn't jumped, but the cam will not be timed correctly because the crank
pulley is no longer in the correct position on the crank. Lining up the TDC
mark on the flywheel to put the engine at TDC will reveal the cam timing
problem because the cam pulley mark won't line up (nor will the crank pulley
mark, which tells you that the crank pulley has shifted).
I have come across one I5 engine with no mark on the flywheel - if this is
your case you will have to manually find TDC on cylinder #1 by checking the
piston position through the spark plug hole. 

How does your mechanic know that it was coolant he was seeing and not
unburned fuel or the oil that was put in the cylinders to try to restore
compression? Did he extract a sample? If the car was starting and running
fine before you started the injector replacement I doubt that it would blow
the head gasket just sitting there while you replaced injectors. It sounds
like you haven't had the car running since you did the work.

Good luck!

Fred Munro
'97 S6
-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] On
Behalf Of Christopher Gharibo
Sent: Friday, June 28, 2013 10:41 AM
To: Steve; quattro at audifans.com
Subject: Re: '91 100q 5 injectors replaced - now car wont start

Tried oil in the spark plug hole to no avail. Timing marks are lined up.

My mechanic advised that he thinks he is seeing coolant in 3 spark plug
holes.

I am baffled. Everything else in this car is in great shape.  

I am about to part this thing out or just sell it as is. It's in Northern
NJ.

Any other advice?

------ Original Message ------
Received: Thu, 27 Jun 2013 06:42:38 PM EDT
From: Steve <phixxitt at yahoo.com>
To: Christopher Gharibo <cgharibo at usa.net>, Cody Forbes <cody at 5000tq.com>Cc:
"quattro at audifans.com" <quattro at audifans.com>,  Christopher Gharibo
<cgharibo at usa.net>
Subject: Re: '91 100q 5 injectors replaced - now car wont start

> I agree with the washed down cylinder wall theory. RX7s are famous for
this.
I had this happen on an FC that I had that required removing the fuse for
the fuel pump and then squirting ATF in the cylinders and spinning the
engine with the starter to get compression back. 
> 
> The motor sounded like a timing belt had broke and it spun fast with 
> no
compression before I did the fuse/ATF thing.
> 
> I wonder if your injectors are spraying more gas than they should 
> causing
the cylinder wash...
> 
> 
> 
> 
> 
> --- On Thu, 6/27/13, Cody Forbes <cody at 5000tq.com> wrote:
> 
> From: Cody Forbes <cody at 5000tq.com>
> Subject: Re: '91 100q 5 injectors replaced - now car wont start
> To: "Christopher Gharibo" <cgharibo at usa.net>
> Cc: "quattro at audifans.com" <quattro at audifans.com>, "Christopher Gharibo"
<cgharibo at usa.net>
> Date: Thursday, June 27, 2013, 5:32 PM
> 
> I stand by the mention of possible washed down cylinders. Squirt some 
> oil in
each cylinder and see if compression improves.
> 
> -Cody Forbes (mobile)
> 
> On Jun 27, 2013, at 4:57 PM, "Christopher Gharibo" <cgharibo at usa.net>
wrote:
> 
> > He just texted me that the TB marks line up. 
> > 
> > Doubts somethink keeping valves open and say there is little or no
compression
> > in all 5 cylinders. 
> > 
> > ------ Original Message ------
> > Received: Thu, 27 Jun 2013 02:38:05 PM EDT
> > From: Tony Hoffman <auditony at gmail.com>
> > To: Christopher Gharibo <cgharibo at usa.net>Cc: jlagnese at massed.net, 
> > quattro at audifans.com
> > Subject: Re: '91 100q 5 injectors replaced - now car wont start
> > 
> >> Nope, but a skipped timing belt can. THe one thing never stated in 
> >> this thread is if the timing marks line up. I know I've suggested 
> >> it at least once, that is key, If the TB is still turning the cam, 
> >> but jumped teeth, you will have compression issues. Start with the 
> >> basics, they only take
a
> >> second to check!
> >> 
> >> Tony
> >> 
> >> On Thu, Jun 27, 2013 at 1:18 PM, Christopher Gharibo
> > <cgharibo at usa.net>wrote:
> >> 
> >>> Injectors appear to seat well, but they did seat rather easily. 
> >>> Can a
> > poor
> >>> injector seal lead to no compression?
> >>> 
> >>> I used the seals from autohaus.
> > 
> > 
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