Tac Movement - Ford Powerstroke Diesel Forum

 
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post #1 of 5 Old 01-12-2013, 01:50 AM Thread Starter
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Tach Movement

Wondering if my CPS is acting up... No problems on start, run, shutdown. Everything is working seemingly as it should although the other day I noticed my RPMs jumping on the tach when cranking.

Note: This was on a cold start. The truck had not run in a week.


2001 7.3L
Pro Comp 6.5" Lift
Pro Comp 16x10 Alloys
35x12.5 Nitto Mud Grapplers
Sky Jacker Hydro 7000 Steering Stabilizers
K&N CAI JUNKED For A 6637
Straight Piped Dual 4"
Jasper 4R100 (Rebuilt in '05)
Tru-Cool Max
Dieselsite Coolant/Trans Filters
ISSPRO EV2 (Boost, EGT, Trans)
Centramatics
EBPV Switch
'07 Headlight Conversion
Foil Delete
Zoodad
Monitoring with Torque

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post #2 of 5 Old 01-12-2013, 07:50 AM Thread Starter
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Went out, started it after sitting for another 6 days and the tach jumped around under 1k RPMs. Nothing abnormal in my 3 hour drive. Started it again and no tach movement on cranking. Any ideas?


2001 7.3L
Pro Comp 6.5" Lift
Pro Comp 16x10 Alloys
35x12.5 Nitto Mud Grapplers
Sky Jacker Hydro 7000 Steering Stabilizers
K&N CAI JUNKED For A 6637
Straight Piped Dual 4"
Jasper 4R100 (Rebuilt in '05)
Tru-Cool Max
Dieselsite Coolant/Trans Filters
ISSPRO EV2 (Boost, EGT, Trans)
Centramatics
EBPV Switch
'07 Headlight Conversion
Foil Delete
Zoodad
Monitoring with Torque
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post #3 of 5 Old 01-12-2013, 07:01 PM Thread Starter
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2001 7.3L
Pro Comp 6.5" Lift
Pro Comp 16x10 Alloys
35x12.5 Nitto Mud Grapplers
Sky Jacker Hydro 7000 Steering Stabilizers
K&N CAI JUNKED For A 6637
Straight Piped Dual 4"
Jasper 4R100 (Rebuilt in '05)
Tru-Cool Max
Dieselsite Coolant/Trans Filters
ISSPRO EV2 (Boost, EGT, Trans)
Centramatics
EBPV Switch
'07 Headlight Conversion
Foil Delete
Zoodad
Monitoring with Torque
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post #4 of 5 Old 01-13-2013, 06:26 AM
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I'm not sure I understand though,,,

You're not having a problem of any kind, you've just become aware of the intermittent movement of the Tach needle when cranking? - right?

You've heard "If it ain't broke, don't fix it?"

Here's the thing, with an '01, if you have a Trans Temp Gauge in the Cluster it means you have the electrical revision that no longer has the CPS directly drive the Tach. If you don't, then you have the earlier electrics where the CPS does drive the Tach, and give you some indication of the CPS's function. BUT, if the CPS wasn't functioning (and the lack of movement was indicating that) there's No Way it would start! The PCM would actually be seeing "0" rpm and wouldn't fire the injectors.

The more typical CPS failure has to do with Temperature. As the engine gets hot, the CPS fails to send it's signal to the PCM, the engine stops and letting 15-20mins go by cools it enough to allow you to restart again.

I don't think you have a problem....
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post #5 of 5 Old 01-13-2013, 08:04 AM Thread Starter
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You've heard "If it ain't broke, don't fix it?"

Yup and thats the mentality Ive been reserving towards it.

The cluster doesnt have a trans temp guage so I am wheeling around the earlier electronics.

Thanks for the response.


2001 7.3L
Pro Comp 6.5" Lift
Pro Comp 16x10 Alloys
35x12.5 Nitto Mud Grapplers
Sky Jacker Hydro 7000 Steering Stabilizers
K&N CAI JUNKED For A 6637
Straight Piped Dual 4"
Jasper 4R100 (Rebuilt in '05)
Tru-Cool Max
Dieselsite Coolant/Trans Filters
ISSPRO EV2 (Boost, EGT, Trans)
Centramatics
EBPV Switch
'07 Headlight Conversion
Foil Delete
Zoodad
Monitoring with Torque
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