Its the same 4r70w, I didnt change transmissions, I used the 302 harness on the 351, the comp is OBD I, and I just unplugged the knock sensor.

Problems im having is random excessive cranking to start, or weak starts when warm.

Also transmission doesnt seem to be shifting when i think it should, and now ive noticed it slipping when it does shift. Never slipped at all before.

 

Conanski.... Everything is connected, it will not idle. Please help.

 

It basically has the same problem it had before the computer swap.
Problem prior to harness and computer swap:
It idled this afternoon, but will intermittently dip down below 500 rpms then go back to about 850. When slowly giving it gas it is ok, until 2000 rpms. At 2000rpms it bounces between 1600 and 2000 rpms. It continuous the bounces from that point up as you give it more gas.
New Problems:
I tried to read the codes, but the code reader will not start beeping and I do not hear the sensors being tested when the key is turned to on. I could read codes before the swap. Also, the overdrive light is flashing on the shifter now (new problem like the code reader not working).

 

SIG RTN pin is not connecting to the pcm. The pin place holder inside the connector is broken. This explains a lot of the problems. More to come.....

 

Correct me if I'm wrong....But aren't the AODE/4R70W's derivetives of the regular AOD, with electronics...?

And the E4OD is a electronic derivetive of the infamous c6?

Makes sense to me...Since that 4R70W's aren't offered for 460's, etc....Simply not strong enough....

 

Yes but the AODE was never used in a truck only in cars. It had a smaller output shaft and different tail housing with different gear ratios then the 4R70W transmission.
Some called the 4R70W a AODE(W). The "W" was for wide ratio.

 

AODE's were for passenger cars...Crown Vics, etc...IIRC...


What I'm not understanding, is that both the panther chassis cars, etc...Weigh close to what a truck does, and FoMoCo goes an changes EVERYTHING....

Most times, only difference is the body....Same 8.8" rearend, etc..

 

Are you asking why the different gear ratio and smaller diameter output shaft on the AODE then the 4R70W?
If so it had to do with top speed and pulling power would be my guess and they did not want the output shaft to brake on the truck.

The E4OD is a much stronger transmission then the 4R70W and went into larger Trucks and Motorhomes with the larger engines. They keep changing parts inside the E4OD 1989 through 1996 to make it better. I think the last thing they changed in 1996 was the clutch disks and the programing of the computer to match the new clutch disks.

 

I was simply asking, that both types of vehicles, have the same engine, rear end, weight, etc.....What was the deal with making everything so complicated?

 

When I get the Sig RTN pin fixed, my truck will still have the idle problem and the engine bouncing by 500 rpms when it is running over 2000 rpms or under load.

 

SIG RTN is working now. I ran KOEO and got the following codes:
552 - TAB Thermatic Air Bypass solenoid: circuit failure
211 - Profile Ignition Pick-Up (PIP) sensor - circuit failure
332 - Insufficient EGR flow detected

Could 211 and 332 be the cause of the chugging at idle and engine rpm chugging with throttle applied?

After getting the SIG RTN connected the truck would idle high for a minute, then idle low. When it tried to idle low it would ping and pop and back fire, almost die, then return to high idle for a minute. Then continue to repeat until I turned it off.

 

So what air meter are you using and what size injectors?

 

Stock 1994 f150 5.0 air meter and stock 1994 f350 351w injectors

 

Are you using anything to datalog engine info while it's running; fuel trimming, loop status etc...?
What does your vacuum pressure look like at idle?

 

I do not have a datalog device. How do I check the vacuum? Can I use my mityvac tool somehow to check vacuum pressure at idle?