Re: [DML] Delorean Cold Start Issue
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Re: [DML] Delorean Cold Start Issue



Adam,

Before you start any repairs try this:

Let the car sit for a few days. Make sure you give it enough time to expect 
a hard start.
Turn the key on but DO NOT try to start it. Do not crank the engine. Just 
turn the key on and listen if you can hear the fuel pump. You should hear a 
hum from the front of the car and a buzz from the frequency valve in the 
engine bay. The pump and the valve should run for about two seconds and 
stop.
Do you hear them running?

If you do, wait for the pump to stop and turn the key off. Turn it back on 
and wait for the pump to stop. Make sure the pump runs three times and on 
the forth turn of the key start the engine.
Does it start?

If you turn the key on and do NOT hear the pump running you can make it run 
by turning the key off and quickly turning it back on. The pump should run 
for two seconds. Make sure the key is off very briefly, less than a second. 
This should trigger your RPM relay.

The purpose of this test is to see if your RPM relay primes the fuel system 
after turning the key on. Some do and some don't. My RPM relay doesn't prime 
after first turning the key on. To make sure my car starts right away I 
prime it manually by turning the key off and on three times. Then it starts 
right away... on the first power stroke.
If it doesn't start right away and you still need to crank it for a long 
time it might be a number of things like:
-weak fuel pump - when was it last replaced?
-clogged fuel filter - when was it last replaced?
-bad/wrong spark plugs - when were they last replaced and what 
type/temperature are they?
-bad plug wires - same as above

When it finally starts, does it idle smoothly? Does the RPM hunt? Can you 
drive away right after starting or does it loose power when you touch the 
accelerator?
When properly tuned the car should start in the first second of cranking, 
RPM should NOT hunt and you should be able to drive it away right after 
starting with good performance in all throttle positions.

Let us know what you find and we'll go from there.

Greetings from Poland!
Tom Niemczewski
Vin 6149 plus 2418, 3633, 5030, 16473, 17086
Google earth: 52°25'17.66"N, 21° 1'58.40"E
www.deloreana.com


--------------------------------------------------
From: "Adam Troy" <abtphd@xxxxxxxxx>
Sent: Sunday, July 07, 2013 1:52 AM
To: <dmcnews@xxxxxxxxxxxxxxx>
Subject: [DML] Delorean Cold Start Issue

> Hi all,
>
>
>
> I apologize in advance if this question sounds dumb! I know I should have 
> a
> bit more mechanical knowledge for the sake of the car.  J
>
>
>
> As long as I could remember, when I left my D without starting it for 3+
> days it would take a few attempts at cranking to get it to start.  Leaving
> it for 7+ days would increase the starting difficulty and leaving it for 
> 10+
> days would lead to a high likelihood of the D not starting.  I originally
> thought this was a battery problem (even though it would crank fine) and 
> the
> battery would drain after continually trying to start it.  Jump starting
> would work much of the time, and I got a new battery anyway and drove it
> more frequently to prevent the problem.
 



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