RE: [DML] High Idle

["John Hervey" <john@xxxxxxxxxxxxxxxx>]

Woody,
Most of the time the high idle is caused by Vacuum leaks, throttle linkage
not set correct, cable not adjusted properly, fuel mixture set to rich,
vacuum solenoid not set up correctly + more. I know you have done a lot but
it may be just one little thing that was over looked.
I am available 12/7 9am till 9pm
John Hervey
972-564-9321




-----Original Message-----
From: Woody [mailto:BePositive2000@xxxxxxxxx]
Sent: Saturday, February 26, 2005 8:33 PM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] High Idle




I'm stumped. Car insists on running at 2400-2600 rpm.

I've diagnosed the idle circuit by removing the ECU plugs and doing all
the tests. I did not have the temp curve for the thermistor but the
resistance variation approached that of a chart I had for a Volvo B28F.
Nothing seems to be binding in the linkage, throttle plates are closed
at idle, air metering plate not binding.



I tried checking the frequency valve with a dwell meter attached to the
orange wire on the diagnostic plug, but not sure I was reading the
dwell correctly.  One book says read dwell on 4 cylinder scale, other
books, including the Delorean manual do not say what scale so I assume
they mean the 6 cylinder scale. I don't have a gas analyzer and cannot
find anyone around that will check CO who knows the engine.

This car had been in storage for 5-7 years so I removed & cleaned the
tank, cleaned the lines, and replaced the pump, cold start injector,
control pressure regulator, injectors and fuel distributor with those
from my wrecked D which had most of these components replace in the
past 2 years.  Installed new accumulator, as well.

In addition, I installed a new thermistor, replaced most of the vacuum
lines, checked for vacuum leaks in the system and did not find any.

The past 2 days I've also noticed a new possible problem.  The car
starts hard after sitting for several hours.

Thanks in advance for any suggestions or sites to look for answers.  I
thought had troubleshot about every conceivable problem with the
injection system but this one has me stumped.

Woody



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