Can anyone look up in the FSM for the TPS setting-1988, 4.0,

[Frankensteinsmj]

I'd be very grateful if someone has a FSM on a 88 4.0 5 speed manche.

I need to have someone take a quick look at the TPS setting info for me. TIA Frank

[mjeff87]

From the 88 FSM (lemme know if you need anything else):

 

THROTTLE POSITION SENSOR (TPS)

1) Turn ignition on. Check throttle position sensor input

voltage. Connect voltmeter negative lead to terminal "B" (M/T), or

terminal "D" (A/T) of sensor connector. Connect voltmeter positive

lead to terminal "A" (M/T and A/T) of sensor connector.

NOTE: On (A/T) models, connector terminals are identified by

letters molded into back of connector. On all models, do not

disconnect TPS harness connector. Insert voltmeter test

leads through back of wire harness connector. On some

models, it may be necessary to remove throttle body from

intake manifold to gain access to sensor wire harness.

2) Move and close throttle plate completely (M/T and A/T).

Ensure throttle linkage contacts stop. Note voltmeter reading. Input

voltage at terminals "B" and "A" (M/T), or terminals "A" and "D"

(A/T) should be 5 volts.

3) Return throttle plate to closed throttle position (M/T

and A/T). Check sensor output voltage. To do so, disconnect voltmeter

positive lead from terminal "A" and connect it to terminal "C" (M/T),

or terminal "B" (A/T).

4) Maintain throttle plate in closed position (M/T and A/T).

Ensure throttle linkage contacts stop. Note voltmeter reading. Output

voltage should be .8 volt (M/T), or 4.2 volts (A/T).

5) If output voltage is incorrect, loosen bottom sensor

retaining screw and pivot sensor in adjustment slot for a coarse

adjustment. Loosen top sensor retaining screw for fine adjustments.

Tighten screws after adjustment.

[Frankensteinsmj]

mjeff, thanks, I have a m/t and my chilton's procedure is about the same.

When I set it to .8 volts and start it the engine rev's really high so I don't know what's up with that. If I bump it down to about 7.5 volts it idles out ok. If you know anything about this let me know. thanks,

Frank

[JohnQ]

I bought a brand new one and just threw it on. I wonder if I have adjusted right?

[87manche]

mjeff, thanks, I have a m/t and my chilton's procedure is about the same.

When I set it to .8 volts and start it the engine rev's really high so I don't know what's up with that. If I bump it down to about 7.5 volts it idles out ok. If you know anything about this let me know. thanks,

Frank

 

check the grounds, and check that what the TPS is seeing at the connector is what the ECU is putting out.

 

The TPS get's it's power from the ECU, the ECU monitors what it puts out, then compares that to what it gets back. A poor connection/corrosion would throw off that reading.