That DML'er was probably me as I remember posting lots about that particular
problem. Darn MAP sensor read right around 3V all the time. Since that is
within range - it never flagged a MIL. Made a huge difference as expected. Now
I always test them with my mini-vac vacuum tester and verify that they read the
full 5-0V range w/vacuum applied (and that its linear).
Latr,
Shane
George S Willhite wrote:
> Rick, long story short....
>
> I've read a post about a DML'er who had 2 Rams. 1 ran
> great and another ran lousey. He couldn't figure out what
> the problem was until he started swapping parts off of the
> better performing Ram. He swapped out the MAP sensor
> and bingo!
>
> After hearing your symptoms, this story just popped in. I
> tried to find it in the archives but could not. Here is some info
> on sensors causing similar problems from Bob Tom. I would
> suggest using the DML archives and search engine as they
> are priceless in these situations. Hope this helps!
>
> GS -
> ----------------------------------------------------------------------------
> -------------------
> MAP SENSOR FAILURE SYMPTOMS: Poor running, stalling, light on dash
> A MAP sensor can be inaccurate, sending an incorrect voltage to the
> computer.
> If this voltage is still within the range of voltage the computer expects,
> a light
> or trouble code for the MAP sensor may not be set. Fords are particularly
> susceptible to this. problem.
>
> THROTTLE POSITION SENSOR FAILURE SYMPTOMS: Hesitation on quick
> acceleration (passing, "flooring it") , sometimes bad idle. May not
> illuminate
> light or set codes.
>
> The above three sensors along with the ECT sensor are considered "essential"
> sensors. They or their circuits can make an engine barely run or not
> run. Other
> sensors make very fine adjustments to the afr and timing, and do not often
> cause a gross poor running condition. Because these "major" sensors can
> trigger fault codes in other "minor" sensors, it would be better to analyze
> non-computer items, like wiring, coil, fuel injectors or fuel supply before
> trying
> to trace down a code generated by a "minor" sensor.
>
> Bob
-- '96 IndyRam-HisIndy-MPI TB Pulleys RTcam MPComp HVoilpump DynaGearDoubleRoller WindageTray CompTAs '96 IndyRam-HerIndy-numbered(#142)"Track Truck" '74 Triple-Black Dodge Challenger Rallye 360 EFI R&D vehicle '93 Dakota LE CC 318 - newest acquisition
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