Hello all.

So, I have a 4.9l 1995 F150 equipped with the E4OD trans. Lately, noticed over the last two or three days, the vehicle does not want to accelerate under WOT. I can hear the RPMs of the engine increasing, but the vehicle speed will remain the same; it will do this in any gear.

I checked my fluid color and level in the trans, and all was in fine. There was no discoloration or odor, nor was the fluid low at all. I'm wondering if this is a torque convertor issue, or a problem with the clutches slipping.

Mind you, my truck just hit 70k, so this isn't a high mileage vehicle. Under light load, or throttle, the vehicle will shift fine through all gears. However, if I try to accelerate heavily, or go WOT, I get nowhere. It feels like slipping.

Someone recommended that I pull codes; they are as follows:

KOEO 33--EGR did not open

Continuous 28--VAT sensor out of range

Engine Running 63--TPS too low
26--MAF or VAF out of range
32--EVP/EGR not responding during test

My plans are to check for codes again, fluid and filter change, and then see what is going on. Would an 8 hour road-trip at close to 80mph have caused this, because after getting back I noticed this problem.

If anyone could provide me with some insight into this dilemma, it would be greatly appreciated. This is my daily driver, and while I'm alright with a set of wrenches, I do not have the tools or skills to rebuild a transmission. I will take any and all responses into consideration, because at the moment I am clueless.

Thank you.

 

How high to the RPMs go when this happens? Does it go all the way to where the trans normally shifts? Does it hit the engine rev limiter?

 

The engine revs fairly high. I couldn't tell you the amount because my truck doesn't have a tachometer. Sorry for the delay in response.

 

That's not a good sign. It could be low fluid, or a loose/missing internal filter.

The first rule about fixing a transmission is to fix anything wrong with the engine. I don't see how those codes could impact the trans, but I do recommend fixing them first. Sometimes that will fix the trans problem, too.

 

Thank you. Would you recommend dropping the pan and doing a fluid/filter replacement?

Could I post here again to update you or anyone else on this matter?

 

A problem with the TPS will throw off the normal operation of the transmission by the PCM. Suggest getting that one fixed first.

Post any updates or additional questions in this thread.

 

You don't need to replace the filter unless it is damaged or the wrong one. I doubt that changing the fluid will fix what's wrong.

Fix the engine problems and see if that fixes the trans problem.

 

I'm going to. I don't think that my truck has a MAF sensor, at least I can't find one on the throttle body. It has the 300.

What would your guess be? Do you think that the clutches are worn, or is this problem strictly engine related?

 

I already gave you my guess.

 

X2, fix the motor problems first. We had shifting problems on our Lexus. It was the trottle and related sensors.

 

Thank you all. I will do that.