I'd swap the fuel pump relay with another (identical)
relay and see what that does for it. Or listen for the
pump to energize when the key is turned on (not
start). I'd make sure the pump energizes every time in
the "on" position,then attempt to start.
Steve P.
--- Ned Buckmaster <Ned@Buckmaster.com> wrote:
>
> I have a friend with a 2002 quad cab 4.7L 4x4
> Dakota. For about 6 months
> now, he has had intermittent starting problems with
> it. Sometimes, it will
> start right up (like my 2K 4.7L 2x4 does all the
> time. Other times he has to
> crank it for 10 to 20 seconds before it will slowly
> start to fire and then
> start. It mostly happens after it sits for 5 or more
> minutes, but sometimes
> it can sit for days and start right up. Once
> started, it runs fine, gets
> good gas mileage, all is well. It has never shown
> any code on my code
> reader. We tried Chevron Techtron injector cleaner
> first, and it seemed to
> help for a few days. In fact, everything we do
> _seems_ to help for a few
> days, then it goes back to not starting.
>
> He took it to an independent mechanic, who measured
> the fuel pressure and
> said the fuel pump was bad - and wanted hundreds of
> dollars to replace it.
> We ordered one from RockAuto, and put it in about a
> month ago. It started
> right up for a few days, then started doing the same
> thing.
>
> we then installed new plugs and removed and cleaned
> the throttle body.
> Installed a new PVC valve. Worked good for a day or
> two. At this point we
> started swapping parts between his and my truck. IAT
> first - same thing.
> Then the IAC valve - same thing. My truck still
> starts fine.
>
> He plans to get a fuel pressure gauge, and see what
> it is reading when the
> truck won't start. But since we have already
> replaced the pump, and there is
> no filter or anything in the line, I can't see low
> fuel pressure being the
> problem.
>
> Anyone have a thought on what else could be going on
> with this truck? We are
> running out of ideas.
>
> Thanks,
>
> Ned
>
>
>
>
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