RE: [DML] ACCELERATION PROBLEM UPDATE WITH JOSH'S BEAST

["John Hervey" <john@xxxxxxxxxxxxxxxx>]

Mike See below:

-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
mike clemens
Sent: Saturday, August 02, 2008 3:08 PM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] ACCELERATION PROBLEM UPDATE WITH JOSH'S BEAST

Okay, some history first, since several folks have asked.  Josh's car was
originally sold in New York and was driven there for many years.  Then it
made it's way to California and then to Oklahoma and now it resides in
Arkansas.  My best guess is that before I started working on it, it has
probably been 10+ years since it last ran under it's own power.

Here's where we are today.  I utilized many of the ideas that the List
provided to try to solve the backfiring and bogging between 3 and 4000 rpm,
but one hit the nail on the head.  Thanks to Ken K, he suggested I push down
on the air metering flap, while at the same time, giving it throttle.  RPM's
went all the way to red line-----yea.  He also gave me two things to look
at----a vacuum leak and possibly the cat plugged. 


Mike , When you push down on the air flow metering plate you are feeding
more gas with out the proper amount of air mixed with it so yes this will
mask a problem. The question is why won't the car give itself the right
amount of gas with air. Providing you don't have a vacuum leak the WUR /
control pressure regulator is the normal problem. 
Another slight chance may be the FV. If the pressure is not normalized
between the upper and lower chamber of the fuel distributor you could have a
rich or lean condition.


Well, when I snapped off the O2 sensor, I decided to go ahead and pull the
cat, since I was already there.  I was able to remove the cat and when I
looked inside, I saw a mud dauber nest!  After about 5 seconds of trying to
figure how they got in there, I came to realize that it really wasn't a mud
dauber nest at all, but the cat had overheated and melted the 'guts'.  Since
the cat was useless, I gutted it and reattached everything, including a
straight pipe in place of the muffler, just to see if this fixed my problem.

Answer----nope.  I still can't get full throttle and now the idle is hunting
both cold and hot.  (550-950 rpm)

I'm down to this last thing to get BB running 4.0 and out of my shed.  Any
ideas will be greatly appreciated.

Mike   TPS   1630


      

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