Ford Powerstroke Diesel Forum banner

1 - 15 of 15 Posts

·
Registered
Joined
·
21 Posts
Discussion Starter · #1 ·
hi, hoping someone can help me with this. I have an inteminent check engine light that does not trigger any codes. when the check engine light is on the auto. trans. shifts very hard. that appears to be the only symptom.
thanks
 

·
Registered
Joined
·
659 Posts
if the light came on then you threw a code of some sort.what are you scanning it with not all scanners will pull all the codes on a stroker.
 

·
Registered
Joined
·
659 Posts
yea,that unit will not pull our codes especially tranny codes and that sounds to me what you are going to throw.
 

·
Registered
Joined
·
74 Posts
Had the same Problem

My 95 f-350 w E4OD did the same thing. the tester @ autozone and advance auto would not pull any codes. Had to use a Snap-On code reader to get the code.
Mine was a P1728, which is slipage in the 3/4 clutch pack. Could be Lock Up in the convertor or could that the trans is slipping in third or forth gear. Mine was the latter. Good Luck.

Rick
 

·
Registered
Joined
·
21 Posts
Discussion Starter · #7 ·
hey rick, thanks for the reply. what did you do to fix the problem? right now on my truck when the check engine light comes on the trans. shifts gears almost violently, depending on the RPM's and then shifts normal when the check engine light goes off. i just brought it to a shop that has very good techs and equipment and they where unable to come up with any codes that seemed to be related to the hard shift problem. any suggestions ?
thanks
 

·
Registered
Joined
·
17 Posts
mine does this occasionally. it is the torque converter locking up. it won't unlock during shifts making for a very hard shift, and it locks way to early making it feel like a manual. my superchips tuner says it is a throttle switch. that means it is either the idle validation switch or the throttle position switch. worst case is you have to replace the pedal assembly which gives you both switches for about $200 (Ford Parts and Ford Diesel Parts at Powerstroke Shop). easy solution is to clean the terminals on both switches with some good contact cleaner / oxidation remover.
 

·
Registered
Joined
·
21 Posts
Discussion Starter · #10 ·
thanks again, checked and cleaned connections. initial results are promising. wish I had waited a while before dropping $170. at the shop where they couldn't even diagnosis the problem.
 

·
Registered
Joined
·
17 Posts
i hope it helps. others have used this method successfully. unfortunately, mine is still acting up after the spray cleaner. i may need to use something to scrub the contacts. keep me posted after you have put some time on the truck and see if the results hold.
 

·
Registered
Joined
·
517 Posts
mine does this occasionally. it is the torque converter locking up. it won't unlock during shifts making for a very hard shift, and it locks way to early making it feel like a manual. my superchips tuner says it is a throttle switch. that means it is either the idle validation switch or the throttle position switch. worst case is you have to replace the pedal assembly which gives you both switches for about $200 (Ford Parts and Ford Diesel Parts at Powerstroke Shop). easy solution is to clean the terminals on both switches with some good contact cleaner / oxidation remover.
My 97/350 E40D does that occasionally also. Where is the idle validation and the throttle position switch located on the 7.3 as I`m almost sure your suggestion to clean with contact cleaner is what mine needs. TIA.
 

·
Registered
Joined
·
21 Posts
Discussion Starter · #13 ·
the switches are on the throttle pedal. initial results seemed good, but problem is persisting.
 

·
Registered
Joined
·
517 Posts
the switches are on the throttle pedal. initial results seemed good, but problem is persisting.
Thanks, Good luck with yours.
 

·
Too cool for school
Joined
·
9,886 Posts
well my truck shifts hard from 1st to 2nd, but the harder you drive it the smoother it gets lol

someone told my dad they had a recall on the valve body in the tranny but idk
 
1 - 15 of 15 Posts
Top