[V8] No start sometimes

[Ed Kellock]

Based on your experience, it seems the coolant sensor is probably not the
culprit.  

Now I'm on to the OXS.  I don't recall if you have mentioned it previously
but here's my reasoning...  1st, the car died and then restarted.  If it was
the reference sender, then it probably wouldn't have restarted.  With the
OXS, it's offline when you first start the car until it warms up a little
bit, then comes online.  If the ecu is getting a bad OXS signal for any
reason, it will really screw with how the car runs during the warmup cycle.

When the car was running, it ran very poorly, but you were able to get home
okay.  Did it seem to run better as you got closer to home?

I have a very similar issue with my 5speed.  It seemed to coincide with
rechipping my ecu, but I was already not really driving the car much then so
it's hard to say.  I have disconnected my OXS and it improved, but did not
seem to go away completely.  I have swapped the MAF with another V8 and that
did not seem to correct it either.  Unfortunately since the car is "laid up"
until I can do some other service on it, I have not pursued the issue to the
end.  I do know that once it's all warmed up, it seems to run as well as it
ever did, though that's always been an unknown because I've never thought it
ran right.

So, in retrospect, not a lot of help, I guess.  But maybe.  You could try to
disconnect the OXS plug and see how it goes, although on my 5spd, I never
had a no-start condition.

Ed



-----Original Message-----
From: george.fallot at verizon.net [mailto:george.fallot at verizon.net] 
Sent: Tuesday, August 11, 2009 5:36 AM
To: Ed Kellock
Subject: Re: [V8] No start sometimes


I was chicken to drive the car besides on my street yesterday, but it
started 6 times with no problem at all.
   So today I started off to work got 3/4 mile away from the house and it
stalled at a light. It started right up so I kept going. It then began to
buck like it was losing fuel, but it didn't stall. I made it home and I'm
leaving for work with the A4.
   Does today offer any more ideas? I guess I have to wait for the no start
to check the coolant sensor or to try to cool off the crank sensor.
   Thanks,George
----- Original Message ----- 
From: "Ed Kellock" <ekellock at gmail.com>
To: <george.fallot at verizon.net>
Sent: Monday, August 10, 2009 11:42 AM
Subject: RE: [V8] No start sometimes


The sensor on the back end if the passenger side cylinder head (the end of
the head adjacent to the firewall) is the engine temp sender for the ecu.
When these fail, it can cause the ecu to provide too much fuel.  With it
unplugged the ecu uses a default value.  Holding the throttle wide open
accomplishes the same thing as it always has on carburetted cars... lot's of
air to clear/ignite the excess fuel.

-----Original Message-----
From: george.fallot at verizon.net [mailto:george.fallot at verizon.net]
Sent: Monday, August 10, 2009 4:28 AM
To: Ed Kellock; v8 at audifans.com
Subject: Re: [V8] No start sometimes


Is this the cooling sensor you are talking about? If so I'll try it tonight.
  Thanks, George
----- Original Message ----- 
From: "Ed Kellock" <ekellock at gmail.com>
To: <george.fallot at verizon.net>; <v8 at audifans.com>
Sent: Monday, August 10, 2009 1:04 AM
Subject: RE: [V8] No start sometimes


Unplug the sensor on the back of the passenger side cylinder head and crank
the engine while holding the throttle wide open.

Ed

-----Original Message-----
From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com] On Behalf Of
george.fallot at verizon.net
Sent: Sunday, August 09, 2009 6:01 PM
To: v8 at audifans.com
Subject: [V8] No start sometimes


  Once again I need help.I'm hoping someone on the list can help,if not I'm
thinking of the cash for clunkers program. I hate to do it but I've lost my
confidence in my V8.
  Last Nov. I had a small fire in one of my '90 V8's. It had 165k and I
couldn't get it running again, so I took what I could off it (which was
almost everything) and scrapped the rest.
    In June the tranny went on my other '90 V8, 97k. My tranny guy was
willing to swap it for me for $500 as long as I wasn't in a hurry. It took 6
weeks, but I finally got it back a couple of weeks ago.
   It ran great for 1 week, about 300 miles,and I remembered why I like
these cars so much.
   But last week it would not start. It was in my driveway and not hot. I
determined that it wasn't getting gas. I gave it a bit of starting fluid and
it started and ran well. But if I turned it off it wouldn't start without
the starting fluid.
   I changed out the two sensors (speed and crank) with my used ones and it
started right up. I used it for 50 miles and started and stopped it about 8
times.I let it sit for 5 days and today it started right up. I went about 4
miles, turned it off, shopped for 10 minutes and it would not start again.
    I got one of my sons to bring me a can of starting fluid and it started
right up. I drove it home and it will not start without the fluid again.I'm
at a loss,I've owned and worked on these cars for over 10 years now, but now
I'm not sure it's worth it, as I don't know if I can depend on it anymore.
    Hopefully I've given you guys enough info that it rings a bell to
someone, sorry for the long post but I am really upset with the car today
and my lack of knowledge about it.
  George

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