2WD Expy 4.6-Slow Acceleration

[BattleRat]

Yea. I was thinking its the TPS as well. Lets see if stamp as anything to say.

Also! Happy 4th of July guys!


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[stamp11127]

Stamp hasn't been paying attention...been on the sidelines of a forum soap opera. I'll look into it...

Just for sheets and giggles:
1) how many rpms is it turning at 65mph? making sure it is in OD
2) then go wot for 3-5 sec, does it down shift?

This next one is an option
3) if it doesn't downshift to drive, foot off gas, over drive button off - (should downshift and increase rpm @500), back on the gas a little to check acceleration

BattleRat send me your email address for info on the tps

This is just one of the refs:
While opening and closing the throttle, is there a change in the TP PID (TP V PID) between 9.85% and 93% (0.49 and 4.65 volts)?

There's quite a bunch of things to check on this.

 

[JUST4FUN]

Thanks for looking stamp ,hopefully the soap has gone belly up

 

[BattleRat]

1) At 65mph its turning right around 1,600

2) it does not down shift

3) when i hit the overdrive off button, it downshifts, car slows down, and rpms jump up 100 or so


The tps at closed is 19.22 and open at 93.33. Seems like the closed one is too high


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[stamp11127]

If I'm understanding correctly, the trans is not down shifting from OD at WOT. If so try other speeds once it is in OD to see if you can get it to down shift.

How is the acceleration with OD off?

 

[BattleRat]

Wait, you wanted me to go to 65mph with overdrive on, and then go to WOT right away for 3-5 seconds, am I correct? I think I misunderstood that part. Sorry!

 

[stamp11127]

Yes, if it downshifted at that point it tells you that the trans is working correctly and that you're not stuck in OD. If you were stuck in OD it would accelerate slower.

 

[BattleRat]

Hey sorry about this.

Yes, it does shift, and the RPMS jump up to 4000

When I drive it almost feels like the car isn't getting enough of something... really confused. I have already replaced a lot of things, and still not fixed.

What do you think?

 

[FordandPolaris]

My money's on plugs and coils. Unless the cylinder is missing every time, the truck will not throw a code. Old plugs can run fine at idle but still crap the bed once you put a load on the motor.


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[stamp11127]

On the engine that was installed, what was done to it prior to the install? Was it a complete rebuild or an engine that had some new parts put in to make it run?

In other words is this a fresh engine or a junkyard special?

I would get some basic readings before really diving into the problem. See the following link to check for a clogged cat or restriction in the exhaust system.

https://www.youtube.com/watch?v=d-jp1IIJVVk