Re: [DML] more technical help needed
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Re: [DML] more technical help needed



 
> But if I started it to put it on the ramps and shut
> it off then tried restarting it, it sounded almost
> like the starter was engaging for about three
> seconds too long, it would sputter for a few seconds
> then die.  Subsequent attempts at starting resulted
> in it just cranking.  Leave it for half an hour and
> it would start right up.  

This to me sounds like the air/fuel ratio is out of
whack.  Not badly, but just needs to be "tuned".  My
car used to do this.  It would sputter and almost hold
on, then just die.  Cranking it like that can flood
the spark plugs, so you left it alone for a bit of
time.  Spark plugs unflood, you go to crank, engine
has been "prefilled" with fuel from previous attempt,
so your car starts fine.  I used to go through that
cycle, this is what Casey and I did to fix that.

1.  Credit to Dave Sontos - this is his site:
http://mysite.verizon.net/vze7u0gn/id6.html

Dwellmeter at your local Pepboys for $25.99-$49.99. 
This is assuming your fuel system is fine.  

2.  For that you'll need a K-Jetronic Fuel Pressure
System Checker (boy that sounded "technical") - get
one here: http://www.jcwhitney.com.  For the search
engine where it says put in "name or part #" put in:
ZX123617U.  $57.99 - some of the best you'll EVER
spend.

Once you've determined that all the fuel pressures are
A-OK, run the dwellmeter test (have a 3mm allen wrench
to tune the air/fuel screw if you have access to it). 
If you have access to it, it will be in a hole between
the "plenum" and the fuel distributor.  If there is no
hole there, no one before you drilled it out and you
don't have access to it.  If that's the case, that is
a GOOD thing - no previous owner's before you will
have screwed around with it.  In the world of
pre-owned DeLoreans, that screw not being tampered
with is about as likely as getting a DeLorean with
"sliding" windows from pre-production models.  The
screw really isn't meant to be tampered with UNLESS
you're re-tuning the fuel/air mixture ratio because a
PO messed it up.  I'll bet alot of us can attest to
having to do that..

In conclusion - barring the possibility of retuning
the air/fuel ratio - you probably have a fuel pressure
issue.  If you're car starts fine but is finicky
starting warm, biggest culprits are fuel accumulator
and the O-rings in the primary pressure regulator.  If
your car takes multiple starts when cold or exhibits
engine bogdown when accelerating cold, biggest culprit
is the control pressure regulator.  My money is for
the underdog - a mixture of the mixture screw needing
to be adjusted and the O-rings in the primary pressure
regulator needing replacement.  O-rings are available
here: http://tinyurl.com/dq8bk

Man, I swear I type too much.

Jeremiah


		
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