Thought about the injector before but not that seriously. I'll check
that out this weekend and see what I got. I keep the TB cleaned with
every oil change so I doubt that would be it. I am very careful with the
IAC sensor. Good ideas to look into though. I'll try them out.
Jeff Durling
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Brian Tong
Sent: Wednesday, June 18, 2003 12:41 PM
To: dakota-truck@dakota-truck.net
Subject: RE: DML: Hesitation when cold
o2's are probably not the problem if it's stumbling when cold. The PCM
doesn't read them until the motor is warmed up. From what you are
describing, a vacuum leak is a very likely candidate. Or a
mal-functioning
fuel injector. A can or two of really potent fuel injector cleaner may
be
all you need if an injector or two are simple leaking a little. I don't
have an FSM handy so I don't know what the resistance of the coil inside
the
injector should be, but I would take an Ohm meter to the terminals of
all
your injectors and see if one or more is slightly higher (by an order of
an
ohm or two) than the others.
The experience I'm drawing from is my '90 300zx. These cars are
NOTORIOUS
for fuel injectors going bad, and mine had very similar symptoms as your
truck. Rough idle, stumbled when cold, etc. The injectors on that car
are
supposed to be between 10 and 14 Ohms. I had one that was at 16.8 Ohms.
Changed it out, problem solved.
Another easy/cheap thing to try is cleaning the throttle boddy and
butterfly
valve. If that's gunged up with anything, it'll act like a vacuum leak
at
cold operation when the PCM is running off of a preprogrammed map.
Brian
'99 CC 4x4 5.2L
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