Cold engine, no acceleration power
- Thread starter Solucion
- Start date
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Broncobill78
New member
Transmission fluid and filter were changed recently. When the engine has warmed up the acceleration is excellent. It only happens when the engine is cold.
Broncobill78
New member
Ok, but I'd still look to the transmission. Torque converter maybe but it sure does *sound* like a transmission problem. On the other hand a 94 will have an electronic transmission so you may have something squirrely going on with the computer. Yours piggybacks the transmission management onto the engine ECU so it doesn't have a seperate comp for the tranny. I would still really suggest you bring it to a tranny shop, any of the good ones will diagnose it for free. Could be something like a worn transmission pump & it's not making any pressure until it heats up & bit and the tolerances squeeze down enough for it to pressurize. If it's driving ok after it heats up I would tend to think there's something going on with the fluid pressure or the torque converter, if it were a worn band it would be doing it all the time.
My 88' has a blown first gear, it moves (not quickly & only at high revs) around in first but only for a few minutes until the fluid gets hot. Once it's at operating temp I'm stuck with only having reverse. I'm only 2-3 blocks from the package store and it runs in 1st long enuf to get me there but I have to come home in reverse (the folks in my neighborhood just LOVE that)
bidibronco
New member
When it's cold and it's not in gear how does the engine rev? If it revs fine then I would also say transmission. Never hurts to warm it up and check the fluid level in the tranny anyways. If it revs funny in park I would suggest checking your IAC (I think that's what I'm thinking of *duh*) or maybe even your timing or fuel pressure. I hope I'm not sounding dumb (not much blood in the caffeen system). Also, when's the last time the cap/rotor/plugs and wires were changed? Just suggestions though...
Thanks again, I will take it to a tranny shop and come back if this solves the problem.
It starts fine and then revs high but steady for about 2 minutes (will clock it the next time). Even after the revs come down, the car doesnot accelerate, but slowly gets moving.
The distribution cap was changed, so were the spark plugs and cables.
One of the mecanics took the injectors out for testing and discovered that they were not closing enough/ rapidly enough. Injectors were cleaned, it is a little better, but the problem persists. Tranny fluid levels are ok, although I find them too high (level is way above the max. mark).
bidibronco
New member
Did you check the fluid on level ground with the truck on and the tranny in P (or is it N?)? Also, you didn't mention how it revs in park or not in gear while it's cold. Another thing too, make a signature with as much stats about your truck as you can and it'll help people find out what's wrong with it.
Broncobill78
New member
Uhm, well, I want to say this politely but if the fluid is "way" (your quote not mine) above the max line then the fluid level is most certainly NOT ok. I'm not going to beat a dead horse here but I'd sure say it looks like you have transmission issues and it should probably be seen by a professional transmission shop.
I have a 95 xlt w/5.0 auto mine does the same thing I was told by a trans tech that it is the comp waiting till the tranny fluid is warm but I allways wait till the engine warms up before driving just to blow out any condinsation and less stress on engine and drive parts ( but thats me) good luck!!
yo!
from a pal;
"Any Ford E4OD regardless of gas or diesel will not lock the converter until the coolant temp reaches 100 degrees. I think this is so you don't lug a cold motor which is as bad as revving a cold motor."
------
EDIT; adding following;
by Ryan M;
".. Before testing the ECT or any other EFI component perform a self-test, trouble codes received during test can be used as a diagnostic tool along with other indicators. To test an ECT sensor you will need a volt meter. You can test the ECT by back probing the harness while reading the voltage returning to the EEC. Or you can removing the connector completely and test the resistance between the 2 pins on the ECT. The engine temperature must be greater than 50
from a pal;
"Any Ford E4OD regardless of gas or diesel will not lock the converter until the coolant temp reaches 100 degrees. I think this is so you don't lug a cold motor which is as bad as revving a cold motor."
------
EDIT; adding following;
by Ryan M;
".. Before testing the ECT or any other EFI component perform a self-test, trouble codes received during test can be used as a diagnostic tool along with other indicators. To test an ECT sensor you will need a volt meter. You can test the ECT by back probing the harness while reading the voltage returning to the EEC. Or you can removing the connector completely and test the resistance between the 2 pins on the ECT. The engine temperature must be greater than 50
Last edited by a moderator:
