Update on 200 heat soak problem

Kneale Brownson knealeski at sbcglobal.net
Sun Aug 24 19:47:59 PDT 2008

The engine speed and ignition reference sensors do not have to get hot to fail.  Hot failure is a symptom of impending failure.  Does the tach bounce while you're cranking?  If so, the speed sensor is working but the reference sensor is not.  If the tach doesn't move, the speed sensor and/or both of them failed.  I'd replace both.

Jean-François Roldan <roldan_jf at hotmail.com> wrote:  
Ok, new twist this morning...

Car started for about one minute, then died just before I got out of the driveway. No start after that, treid a few times, got it again, died right away. Then it acted like it wasn't getting any fuel. Runs for a second and dies... or runs a little longer, very poorly and dies suddenly.

I let it sit for a few hours, tried again, same issue. The car is not moving anymore...

It does start, so not a hall sender issue, it is not hot, so not a engine speed or crank sensor, looks like fuel pump. 

I am getting a little frustrated with this now... 

JF> > ----------------------------------------------------------------------> > Message: 1> Date: Sat, 23 Aug 2008 23:32:43 -0400> From: Jean-Fran?ois Roldan > Subject: Re: Update on 200 heat soak problem> To: <200q20v at audifans.com>> Message-ID: > Content-Type: text/plain; charset="iso-8859-1"> > > Thanks for your reply,> > I replaced both sensors about 3 months ago... (speed sensor and CPS).> > It seems to be doing it after about 20 minutes of driving in the morning once it gets warm the first time of the day. After it restarts and maybe doing it a second time, it is fine for the rest of the day and the temp outside just gets hotter so is everything else.> > Drove it all around the place today, no issues at all...> > > JF > 91 200 tqa > > > > Jean-Fran?ois Roldan wrote:> > drove the car yesterday, no issues at all. Took it this morning, died after 20 min... started again after 5 min of wait, was on my way to the shop...> > > > once there, they plugged it in, no codes.> > >
 > drove around town after that and back home, no issues...> > > > mechanic remembered many fuel pumps going bad in these model years, could it be an issue?> > I didn't see an answer to this, so I will give it a shot.> I don't think it's the fuel pump. If they die, they don't> get better again.> > My guess is a sensor of some sort, dying from old age and the heat.> It works when cool, then dies when hot. When it cools off, it's> better a gain until it gets hot. It may or may not throw a code,> since it is "working" for some definition of working.> > On the V8s, the crank position sensor is subject to a lot of heat,> and dies the way you described. The CPS is buried deep down in> the engine compartment, near the flywheel. One test is to pour> cool water on the suspected items, cooling them off. If the> car restarts right away, you've identified the culprit.> > Bon chance. :)> > -- > Kent McLean> '99 A4 Avant, w/ quattro, V6, Tiptronic, :)> '91 200 TQA #1, backup car> '9!
4 100 S 
Avant, "Moody", now with a new owner> '91 200 TQA #2, up in smoke 2> '89 200 TQ, "Bad Puppy", up in smoke> > _________________________________________________________________> > > > ------------------------------> > _______________________________________________> 200q20v mailing list> 200q20v at audifans.com> http://www.audifans.com/mailman/listinfo/200q20v> > > End of 200q20v Digest, Vol 58, Issue 20> ***************************************

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