Not-running 90q (was poorly-running)

[Ado Sigal]

Although you've said that the timing checked OK, the circumstances and 
the signs are consistent with broken crank woodruff key.
Belt can't slip until it looses several teeth, and if that happens at 
speed, the engine would die instantly, you've had the engine gradually 
dying, as the crank sprocket together with balancer pulley slowly moved 
the timing out of range, until the valves interfered and then died for 
good. IMO, that's where the problem is, and if the valves even slightly 
interfered, its 99% sure valve job. As Kurt said, compression test would 
tell, but first establish and fix the timing problem, and when the 
engine is running, the quality of idle would tell you the state of 
valves, just as much as comp test.

Ado


Kurt Deschler wrote:

> Check the timing belt. Sounds like telltale slipping. I hope your motor
> isn't interference if thats thats the case since you were hearing funny
> noises. It is possible for valves to lightly contact pistons and not bend
> them (dents the pistons or worse). Check compression anyways.
> 	-Kurt
> 
> 
>>Message: 3
>>Date: Thu, 15 Apr 2004 12:08:44 -0500
>>From: Hoffman Anthony J A1C 552 CMS/MXMVC
>>	<Anthony.Hoffman at tinker.af.mil>
>>Subject: RE: Not-running 90q  (was poorly-running)
>>To: "'DePenning, Charles [EPM/MTN]'"
>>	<Charles.DePenning at EmersonProcess.com>
>>Cc: "'Quattro at audifans.com'" <Quattro at audifans.com>
>>Message-ID: <200404151710.i3FHAapd020927 at legolas.tinker.af.mil>
>>Content-Type: text/plain
>>
>>The first thing I would do is get some new sparkplugs (autolite,
>>etc----cheap) and put them in. this will probably get it running (poorly)
>>again. Then check for vacuum leaks around the injectors, by spraying water
>>there - if the engine runs worse, there is a leak. I have also experienced
>>dirty fuel pressure regulators on the CIS-E cars. I've succesfully cleaned a
>>few with carb cleaner. Unscrew it from the fuel distributor, and spray the
>>holes in the front with the carb cleaner. This should clean it out. You
>>should also consider cleaning the fuel distributor. The way I've done this
>>is to unscrew the holder(big nut) from the bottom of the distributor, and
>>let the piston drop out, then run the pump (it will dump gas out the bottom
>>of the distributor, so put a bucket or something under it) and this should
>>clean any big pieces that would get stuck. Then, put it back together and
>>see.
>>
>>Tony Hoffman
>>
>>-----Original Message-----
>>From: DePenning, Charles [EPM/MTN]
>>[mailto:Charles.DePenning at EmersonProcess.com]
>>Sent: 15-Apr-2004 8:48 AM
>>To: 'quattro at audifans.com'
>>Subject: Not-running 90q (was poorly-running)
>>
>>
>>I'm still scratching my head with my '89 90q that flatly refuses to run
>>right.  Very lumpy idle, no power at all, sounds like it's missing on a few
>>cylinders.  Happened suddenly at highway speed.  I've been working with the
>>assistance of folks on this list to cure the problem, working mainly on the
>>CIS side of things.  I've checked and double-checked about everything I can,
>>and all components look to be right in spec.  Exhaust is open- no clogged
>>cat.  Last night I just let the car run until it was well warmed-up, and the
>>missing behavior got worse and worse, until it sounded like it was running
>>on 2 cylinders, barely staying running, with some very strange 'clanking'
>>sounds coming from the engine- sounded like mechanical interference, but
>>might have been pre-detonation or knocking, which sounds similar.  Then it
>>died, and would not re-start.  I had a thought that maybe the gas was bad
>>enough after sitting for three months that maybe it was causing the problem-
>>not likely, but I've tried about everything else.  So I drained the gas from
>>the tank (using the fuel pump through the fuel return line in the engine
>>compartment) and put 5 gallons of fresh gas in the tank.  Still just
>>wouldn't start.  I waited until this morning, engine cool.  No start.
>>Before, I could at least get it to start and run lumpily.  Now nothing.  I
>>pulled all five plugs and checked spark at each- good.  Compression still
>>good.  Each cylinder smelled of gas and the plugs were slightly wet and I
>>could see a little gas on top of the pistons.  I am at a loss to find what
>>is steadily getting so non-functional that with fuel and spark both present,
>>I can't get the thing to even fire a little.  Any help would greatly be
>>appreciated!
>>
>>TIA,
>>
>>Charley DePenning
>>'89 90q
>>'84 4kq
>>'83 5kT
>>
>>
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