RE: [DML] Re: Strange acceleration problem ( For Rob Grady)
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RE: [DML] Re: Strange acceleration problem ( For Rob Grady)



Dennis,

One bad tank of gas in four years would be more than sufficient to cause
cold startup hesitation due to restricted fuel flow when your lambda circuit
is in its fixed rich mode as it is when cold. Try the filter as it's cheap
enough to do on a regular maintenance schedule. The omission of a heat stove
is probably not the problem as my green car is set up similar to yours
without this hesitation. Let us know if the filter works should you decide
to change it.
As for your friend he's overdue time-wise to change the accumulator as I
know of few if any cars that are still using an original, and functional,
accumulator. Another strong possibility is that the distributor reg. valve
o-rings he replaced are not suitable for use with today's gas and I would
suggest he pull the valve and recheck them as it's a 5 minute job (longer if
he,s mechanically challenged:).

Rob Grady

P.J.Grady Inc.
 

-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
dmc_5180
Sent: Saturday, October 22, 2005 3:19 PM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] Re: Strange acceleration problem ( For Rob Grady)

Rob,

I too have a very similar experience when I Start my engine cold and then
immediately try 
to take off at a quick pace without letting the car warm up for a minute.
As I get to a 
certain rpm under acceleration the engine will suddenly fall off and
backfire pretty loud.  I 
let up on the accelerator a bit so it stops and continue at a less agressive
pace. it usually 
only happens once when cold. it generally goes away a half mile further down
the road.

I replaced my fuel filter 4-5 years ago and even then my fuel system was
quite clean inside 
the tank.  I was in their this spring and everything was quite good. I could
understand  
changing the filter if you went into the tank found rust and disintragated
rubber 
everywhere.  But mine is clean. I won't rule out changing it, but I would
like to know what 
the other things are I should look for the other 40% of the time.

One thing I should also point out is that I have  the Houston exhaust which
does not have 
provisions for the heat riser duct . I just have the pipe tucked loosely on
top of the right 
header so it can draw in any heat heat generated in the area. 

Other than this, the car runs perfectly. It always starts instantly and
idles smooth @ 775 
unless it is really cold say less than 50 degrees out then it might idle
hunt a little for 3-4 
ups and downs before being constant.

On a diffenet note:

I have a friend who's car will not hot start, even if he just turned it off
and goes to restart. 
Although it will restart if you do the CPR connector swap on the cold start
valve. I was 
under the car a month ago and did a test where we ran the car with the
small return line 
running into a jar to see if the accumulator was bad.  After the initial
start-up 
pressurization of the system, which of coarse pushed fuel out of the spring
side of the 
accumulator, the flow almost stopped but did continue to drip albeit very
slowly  but was 
constant. I just can't imagine that this would make the car not restart
after shutting it off 5 
seconds earlier. He has replaced the fuel pump and the O-rings in the fuel
distibutor. The 
only thing left is the accumulator ,which he has, but hasn't gotten around
to changing yet. 
Are their any other possilities? 

 He also has cold weather hesitation although it is much different than my
symptoms. His 
car will stumble slightly when  when accelerating say for the first 10
minutes after the car 
has been started cold. it feels more like a mis in the engine than an all
out lean situation 
he's done an ignition tune up with no change. He runs a can of B-12 thru it
every few 
months, with no change. I even swapped my CPR for his to try see if that
might be the 
problem. no change their either accept he thought the car didn't accelerate
as well with my 
unit than his. so we switched them back, and his car ran fine again. My car
runs fine with 
my CPR so I'm not sure what the deal is their either.Many times he has to
depress the 
accelerator half way to the floor and then it will eventually start. His car
has been that way 
since he's owned it (5 years) it almost acts like it's flooded. On the other
hand my car 
always starts immediatley by just turning the key. We have been chasing this
mystery quite 
some time now.

Rob, any suggestions would grately appreciated. 

  Dennis 

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