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HI
After heavy rain my tachometer is going nuts. its just jumping up and down. A couple of time engine did rev up, but mostly its tach. Any ideas of help? thanks...
1998 Contour V6 Duratec 2.5L
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Maybe the VSS is about to fail.
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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The battery voltage being low can cause this, as well. It causes all sorts of wierd things to be possible (wipers coe on all by theirselves, jumpy speedo/tach... flashing airbag lights, etc)
Purely as a guess, I would imagine that your battery is low, and posible that the rain is a coincedence.
The possibility that water is getting on to the PCM or associated wiring is THERE, but not likely. (its on the passenger side of the engine bay, near the firewall.. check for water up top of the engine...)
The other possibility is the failing sensor, as previously stated.
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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Battery was ok, i checked. its water thats getting on PCM.
i have no clue how its getting there. i even sprayed it with plastic before and covered it with plastic bags but its still happening.
1998 Contour V6 Duratec 2.5L
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Originally posted by Tony2005:
Maybe the VSS is about to fail.
Incorrect. A VSS would not affect the tach.
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Originally posted by powerx_32:
Battery was ok, i checked. its water thats getting on PCM.
i have no clue how its getting there. i even sprayed it with plastic before and covered it with plastic bags but its still happening.
LOL I wish I knew where the PCM was actually located so I could help you out. 
Do you have an type of guards missing from wheel wells or anything? Did you totally dry the PCM before trying to cover it back up?
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PCM is on the passenger side of the vehicle, topside, near the washer resevoir.
Water is likely entering from either the cowl area (firewall side of the hood, near the wipers) or from the passenger tire well, is a splash shield is missing, or was never present.
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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Originally posted by CSVT1214:
Originally posted by Tony2005:
Maybe the VSS is about to fail.
Incorrect. A VSS would not affect the tach.
"A couple of time engine did rev up".
If the engine was reving, it would.
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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"If the engine was reving, it would."
when car was at constant speed and constant rev (ie2000) all of a sudden it when to 3500.
i did dry PCM and covered it. after standing through out a night car is driving OK but tach was still jumpy and now its stuck at zero.
1998 Contour V6 Duratec 2.5L
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Originally posted by powerx_32:
when car was at constant speed and constant rev (ie2000) all of a sudden it when to 3500.
When it went to 3500, was it just the tach going to 3500 (without the engine "revving") or did the engine rev up to 3500 and you heard it and saw it on the tach.
If it is just the tach, then you know it is just an electrical issue to/revolving around the tach (or wiring).
If it is engine revving, it could be the PCM (or wiring) or the VSS (also check the wiring/connectors to the VSS). When my VSS went, it took a long time between the first time (wet and cold March) I noticed it before it actually "died" (humid and cold December).
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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