Maybe the IAC sensor?
--Hop
----- Original Message -----
From: "Rick Barnes" <rascal@scrtc.com>
To: <dakota-truck@dakota-truck.net>
Sent: Wednesday, November 09, 2005 7:45 PM
Subject: DML: RE: RE: Re: Re: Spark plug gap
>
> Dan, think simple...a rough idle at low rpms..sounds spark related to me.
> Check for a bad dist cap, lousy plug wire, maybe it touched an exhaust
> manifold and got burned enough to make it jump...one trick is open your
hood
> in the dark with the engine running to see if a spark is jumping. It
could
> always be something else like a sensor, but check the easy stuff first.
>
> Rascal
>
> -----Original Message-----
> From: owner-dakota-truck@bent.twistedbits.net
> [mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Dan
Kramarsky
> Sent: Wednesday, November 09, 2005 4:34 PM
> To: dakota-truck@dakota-truck.net
> Subject: DML: RE: Re: Re: Spark plug gap
>
>
> Rascal & Biff,
>
> The plugs, cap, rotor and wires were all replaced in March 2005. ( i did
a
> tune-up )
>
>
> It ran fine all summer. The rough operation between 1400 and 2000 RPM
> appeared about 3
> to 4 weeks ago.
>
> I guess something could be failing. I think it could be O2 sensor. TPS
> and MAP check
> out ok. The coolant temp sensor is flakey but thats just for the gauge
in
> the dash
> right?
>
>
> I will check the resistance in plug wires. You said anything less than
> 14,000 ohms
> right? But typically its 4,700 ohms. My wires are AutoLite Pro.
>
> Also I will get another set of AP3924 plugs and gap at 0.035 just to see
if
> theres any
> difference in performance.
>
> Q: What about a valvetrain problem? Would it show up in certain bands of
> RPMs. Say
> 1400 to 2000?
>
> -dan
>
>
>
> >
> > Date: Mon, 7 Nov 2005 23:07:25 -0600
> > From: "Rick Barnes" <rascal@scrtc.com>
> > Subject: DML: RE: Re: Re: Spark plug gap
> >
> > Very possible. How are your distributor cap and spark plug wires?
> >
> > Rascal
> > - -----Original Message-----
> > From: owner-dakota-truck@bent.twistedbits.net
> > [mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Dan
> Kramarsky
> > Sent: Monday, November 07, 2005 7:08 PM
> > To: dakota-truck@dakota-truck.net
> > Subject: DML: Re: Re: Spark plug gap
> >
> >
> > So, is it possible my 1992 engine doesnt like the 0.040 gap?
> > Would it cause mis-fires? run crappy? or just lose HP?
> >
> > - -dan
> >
> >
> > - ---- Biff wrote ----
> > I've had two Gen I's and they did not like anything over 0.038. But
that's
> > the old oil coils for you. Right now I run NGKs at about 0.038 in my '95
> > Sport. 1996 and older magnums call for 0.035, 1997 and up magnums call
for
> > 0.040. I put a set of NGK's in my buddies 98 Laramie back in March.
Gapped
> > tham right at 0.040. Not a gripe yet, and this guy isn't very hep on
cars,
> > he's a tile setter. I have run AP3923 or 4's at 0.040 in mine. No
> > difference in performance or mileage except maybe a little better speed
> > going up a 7% or a long 3 or so % grade. Biff
> >
> > Dan K.
>
>
> Dan K.
> '92 Grey Dak CC, 318, 4x2, 46RH, 3.55 rear, 235/75R15, PS, PW, PB, PL, AC.
>
> Mods: Cool air, K&N oil/air, 180* T-Stat, Autolite 3924s, re-located
> IAT, Trans-Go shift kit.
>
> Future: Swap motor for a slightly modified Magnum 5.9L engine.
>
>
>
>
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