Transmission Issues
Thread Starter
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Mountain Pass
Joined: Mar 2019
Posts: 111
Likes: 11
From: Rancho Cucamonga
Transmission Issues
Looking for real time help,
2003 Ford Ex V10, 4x4, towing 9k+ travel trailer
Had check engine light come on, multiple misfire.
check engine light is gone, driven 500+ miles without it, now: stalls in drive and OD light flashes. I put it in park, restart, no issues. There are no other symptoms I know of.
similar stalling issue a few weeks ago, took it too my shop and they couldn’t figure out what was wrong, there were no codes.
all spark plugs and boots replaced approx 30k miles ago, and the #7 coil only.
from SoCal, currently in Port Clinton, OH
any ideas?
2003 Ford Ex V10, 4x4, towing 9k+ travel trailer
Had check engine light come on, multiple misfire.
check engine light is gone, driven 500+ miles without it, now: stalls in drive and OD light flashes. I put it in park, restart, no issues. There are no other symptoms I know of.
similar stalling issue a few weeks ago, took it too my shop and they couldn’t figure out what was wrong, there were no codes.
all spark plugs and boots replaced approx 30k miles ago, and the #7 coil only.
from SoCal, currently in Port Clinton, OH
any ideas?
Thread Starter
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Mountain Pass
Joined: Mar 2019
Posts: 111
Likes: 11
From: Rancho Cucamonga
Mark, thanks for chiming in! I’m not a huge contributor on here, but you’re who I was hoping would show up.
The biggest problem was that according to my shop there were no codes, however, I was able to create the failure yesterday: truck in drive and held the brake for about 1 minute as if at stoplight, low and behold! Started to stall, I put it immediately into park and the OD light started flashing and simultaneously check engine light came on.
Friday evening before holiday weekend, no shops open but I did make it to a parts store with a code reader and it read an output shaft sensor failure. I bought the part and replaced it, so far can’t create the problem again. We shall see.
thoughts?
The biggest problem was that according to my shop there were no codes, however, I was able to create the failure yesterday: truck in drive and held the brake for about 1 minute as if at stoplight, low and behold! Started to stall, I put it immediately into park and the OD light started flashing and simultaneously check engine light came on.
Friday evening before holiday weekend, no shops open but I did make it to a parts store with a code reader and it read an output shaft sensor failure. I bought the part and replaced it, so far can’t create the problem again. We shall see.
thoughts?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,695
Likes: 2,616
From: SE Florida
You got very lucky. The parts stores can only read codes that turn on the check engine light. You may have other codes stored that they can't see.
Get Forscan. It is a free download at www.forscan.org. Their page shows how to select an adapter to plug into the OBDII port. I bought mine from Amazon for about $30. If you just read codes it is free to use. If you want to make changes you need to buy a license, and the license is pretty cheap.
Get Forscan. It is a free download at www.forscan.org. Their page shows how to select an adapter to plug into the OBDII port. I bought mine from Amazon for about $30. If you just read codes it is free to use. If you want to make changes you need to buy a license, and the license is pretty cheap.
Thread Starter
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Mountain Pass
Joined: Mar 2019
Posts: 111
Likes: 11
From: Rancho Cucamonga
So, replaced the OSS, same issue.
When I am in D, foot on brake at signal or stop sign, engine fails. Throws the OSS code and OD light on shifter blinks.
sounds and feels like engine is missing when in this condition, no noticeable issues while driving.
I’ve ordered an adapter and downloading forscan, so we shall see.
I’ve seen others describe this problem and they’ve replaced plugs and coils and issue goes away.
anyone know a good mechanic in Fremont/Toledo, Ohio area? I’m getting to the end of my ability.
When I am in D, foot on brake at signal or stop sign, engine fails. Throws the OSS code and OD light on shifter blinks.
sounds and feels like engine is missing when in this condition, no noticeable issues while driving.
I’ve ordered an adapter and downloading forscan, so we shall see.
I’ve seen others describe this problem and they’ve replaced plugs and coils and issue goes away.
anyone know a good mechanic in Fremont/Toledo, Ohio area? I’m getting to the end of my ability.
Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
Likes: 88
From: Thousand Oaks, CA
When the engine is running in gear at idle the air intake is controlled by the Idle Air Control valve which bypasses the throttle body and has no OBD codes for poor operation.
A sticky/erratic IAC valve can cause problems with the engine idling properly.
Also, monitor the fuel pressure at the fuel rail test port, I don't think there are any codes for low fuel pressure.
Reseat the PCM connectors, there might be some contact corrosion after 20 years.
The trans OSS OBD code could be a separate issue.
Thread Starter
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Mountain Pass
Joined: Mar 2019
Posts: 111
Likes: 11
From: Rancho Cucamonga
Thanks, where are the pcm connectors?
The truck doesn’t seem to have any idle issues except when it’s idle in drive and not moving, so if IAC was faulty wouldn’t it have issues idling in park or neutral as well?
Don’t misunderstand me, I’m hopeful that one of these issues will solve my problem, just trying to wrap my head around if.
Hans
The truck doesn’t seem to have any idle issues except when it’s idle in drive and not moving, so if IAC was faulty wouldn’t it have issues idling in park or neutral as well?
Don’t misunderstand me, I’m hopeful that one of these issues will solve my problem, just trying to wrap my head around if.
Hans
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Thread Starter
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Mountain Pass
Joined: Mar 2019
Posts: 111
Likes: 11
From: Rancho Cucamonga
I know this is an old thread, but figured I'd throw an update in here. What ended up being the culprit were actually several things, but the primary issue was #9 COP boot had a tear and was likely shorting against the head. Was not getting any codes to that effect either. Once I replaced the whole coil, the shudder and shut down along with flashing OD light went away forever.
In the end, found out I had 2 badly worn valve seats and one bent valve and the head gasket starting to go between cylinder 8 and 9.
Hope this helps someone in the future.
In the end, found out I had 2 badly worn valve seats and one bent valve and the head gasket starting to go between cylinder 8 and 9.
Hope this helps someone in the future.
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