Tech sending sensor,,, Need Help
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Junior User
Joined: Mar 2006
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Tech sending sensor,,, Need Help
Well I stopped at my Ford Delaer and bought a new tech sending sensor, after installation and removing the battery terminals for 15 mins , the tech still does not go over 1000 RPM's. it does not jump around, it seems not to be coming up to the proper rpm's. What do I check next , oh ya fluid looks ok . I will change it this Saturday when I have some more time. Thanks
Fleet Mechanic
Joined: Sep 2005
Posts: 1,509
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From: Ladner, British Columbia
Has the tranny operation changed or improved after you installed the new sending unit?
I have never come across a bad Tach Gauge in the dash, usually the problem is with the sending unit you have already replaced.
Is the needle on the Tach free to travel or does it look like it is getting hung up on something?
Could be a poor wiring connection or a bad gauge in the Dash.
Not, sure if you can buy the gauge separate from the instrument cluster, if not you would have to replace the entire instrument cluster. I inquired once about a new instrument cluster and remember that they are not cheap if you get them from the OEM. A wrecker might by your best bet.
I have never come across a bad Tach Gauge in the dash, usually the problem is with the sending unit you have already replaced.
Is the needle on the Tach free to travel or does it look like it is getting hung up on something?
Could be a poor wiring connection or a bad gauge in the Dash.
Not, sure if you can buy the gauge separate from the instrument cluster, if not you would have to replace the entire instrument cluster. I inquired once about a new instrument cluster and remember that they are not cheap if you get them from the OEM. A wrecker might by your best bet.
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Junior User
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I stared it up but did drive it, did not see a change in the tech. , First of all what should the truck idle at. Could you also tell me the shifting rpm's 1 st 2nd 3rd approx rpm's The gauge does not seem to go over 1000 in any gear. Thanks for your time
Fleet Mechanic
Joined: Sep 2005
Posts: 1,509
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From: Ladner, British Columbia
The truck should idle at about 650 rpm to 675 rpm at normal operating temperature. High Idle during warmed up from a cold start is about 900 rpm.
The tranny controller does not just use engine rpm to shift gears, it uses other inputs such as throttle position (FIPL) and vehicle speed (VSS) to determine shifting.
There are also pre-programmed controls such to when the torque converter locks and un-locks.
The tranny controller does not just use engine rpm to shift gears, it uses other inputs such as throttle position (FIPL) and vehicle speed (VSS) to determine shifting.
There are also pre-programmed controls such to when the torque converter locks and un-locks.
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Junior User
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Hamberger, drove the truck last night with no change in the shifting, If I feather the gas right before it shifts it will shift really smooth, no problem in down shifting, what would you check next. Should I put it on a scope to see if I'm getting any codes.
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I have a 86 F250 6.9 with a tach in the instrument cluster, my 84 [recently restored] did not. I swapped the clusters and the sending unit housing, I hard wired the tach sending sensor to the back of my instrument cluster to the tach. Why am I telling you this, well I had simular problems you are describing when the tach was still in the 86. I put in a new sending unit and it was fine...1 check out your wiring up to the fire wall...2 pull instrument pannel [have fun with this] look for any loose connections ect...3 see if tach needle is obstructed in any way [be careful not to dammage needle]...4 with the instrument pannel out, try hard wireing to the sending unit...5 your new sending unit might not be working. All of this is takes time and very little cash...I hope this was helpful, good luck! PS sometimes the plug on the back of the instrument pannel gets dust or loses good connection, you might try that first.
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Post Fiend
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From: Nutter Fort, WV
Getting the insturment cluster out is a real pain in the neck.
But if you have AC that connector is not accessable any other way.
Do be carefull of the printed circuit overlay on the back of the cluster.
But if you have AC that connector is not accessable any other way.
Do be carefull of the printed circuit overlay on the back of the cluster.
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