I had a problem with a plug with a cracked ceramic
casing. When stopped with my foot on the brake I
noticed that it tackomiter was ideling low and
erratic.
It would hit 650rpm and then jump to 700 and repeat
It wasn't noticeable at high speeds except that the
mpg was lower.
Change all the plugs if in doubt.
--- Steve Preston <steve318@webtv.net> wrote:
> I believe I saw on Shadetree one day,they had a car
> with a defective
> platinum plug,and they read the output of a sensor
> when they were done
> replacing it to read idle quality.It may have been
> the crank sensor,I`m
> not sure.My question is this:What sensor is the best
> one to watch for
> voltage fluctuations if you suspect the engine is
> misfiring or missing?
> My buddy has one of those Fluke handheld
> oscilloscopes that I could use
> for that.If the truck starts crappin` out on me as
> bad as it did today,I
> should be able to see that on a scope(assuming it
> responds quickly
> enough).If the truck starts running bad and I don`t
> see a problem on the
> scope,then it would be a transmission problem,right?
> Need help here!
> Thanks,Steve P.
>
> 1999 Dakota Sport RC 4X4 V6 A/T 3.92 Anti-Spin
> w/Infinity CD system and
> optional crank windows (2)
>
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