Transmission shudders in OD at 35 mph

[dac99011]

Hoping you all can help me out with your expertise.

I have a 2003 stock Marauder with 92k miles. I have replaced the filter and cleaned the magnet at 82k (when the vehicle was purchased) and recently had Ford do a Tranny flush.

When I purchased the vehicle (82k miles) the tranny had a slight shudder when in OD between 35-40 mph. Now, the tranny has a significant jerk when down shifting from OD between 35-40 mph.

Is this my OD band or possibly one of the coil pack's gone bad?

I'm looking for some advice on what area to spend money on to try and resolve the issue. When I turn OD off the issue does not occur between 35-40 mph.

Are there any Service Manual's you would recommend (Chilton's, etc)?

Thanks again for the help.

Clint

[whitey]

i was having the same issue, like a stumbling around 36-40mph, i changed the tranny fluid, spark plugs, tranny filter, fuel filter, spark plug wires and it didn't fix the problem, what it turned out to be was the cop's... pm musclemerc on here and he should have some cop's that he'll sell you for cheap. --whitey

[BlueFusion]

COPs or EGR/DPFE. Disconnect the electrical connector from the DPFE. If it stops doing it, it's EGR/DPFE related, probably a restricted EGR tube/valve or the DPFE sensor has moisture in it.

[Marauderjack]

Hoping you all can help me out with your expertise.

I have a 2003 stock Marauder with 92k miles. I have replaced the filter and cleaned the magnet at 82k (when the vehicle was purchased) and recently had Ford do a Tranny flush.

When I purchased the vehicle (82k miles) the tranny had a slight shudder when in OD between 35-40 mph. Now, the tranny has a significant jerk when down shifting from OD between 35-40 mph.

Is this my OD band or possibly one of the coil pack's gone bad?

I'm looking for some advice on what area to spend money on to try and resolve the issue. When I turn OD off the issue does not occur between 35-40 mph.

Are there any Service Manual's you would recommend (Chilton's, etc)?

Thanks again for the help.

Clint


I just PM'd ya......:beer:

[burt ragio]

COPs or EGR/DPFE. Disconnect the electrical connector from the DPFE. If it stops doing it, it's EGR/DPFE related, probably a restricted EGR tube/valve or the DPFE sensor has moisture in it.

I can understand how the COP's could be part or all the problem but EGR exhaust gas recirculator ? What is DPFE & how could that related to problem ?

[dac99011]

Thanks for the replies. What part is the COP's and where it is located (tranny)? Also what is DPFE?

[fastblackmerc]

Thanks for the replies. What part is the COP's and where it is located (tranny)? Also what is DPFE?

COP = Coil On Plug

It's part of the engine's electrical system.

To find out what "DPFE" is, go to www.google.com and in the search box type in "DPFE" (without the quotes), then press the enter key. You will find more info on "DPFE" than you'll ever need.

[dac99011]

Thanks for the information....I will proceed with replacing the COP since I assume they have not been changed and I now have 92k.

For those that have changed COP, did you purchase the OEM from the dealership or use aftermarket?

Thanks again!

[jeffrt]

My car had the same shudder, and it was one of the COP's.
I put in the Accels from JEGS back in April, and they're working great so far.

[RF Overlord]

DPFE = Differential Pressure Feedback EGR and it's the device that determines when and how much exhaust gas to recirculate. It's part of the EGR valve and is not separately replaceable.

[dac99011]

Thank you all for the helpful replies.

Any tips or how-to's on how to replace your COP or DPFE?

I'm going to try and find a Chilton or Haynes manual but if you all have any first hand experience or things to watch out for, I'd appreciate the insight.

Thanks!

[musclemerc]

If you plan on replacing the COP's the do the plugs too.
TQ the plugs to 11lbs, put a little antisieze on the threads, use some dielectric grease on the COP connectors, the COP's are too easy.

Good Luck!

[CBT]

Thanks for the replies. What part is the COP's and where it is located (tranny)? Also what is DPFE?

Holy..........

[Darrin]

I can understand how the COP's could be part or all the problem but EGR exhaust gas recirculator ? What is DPFE & how could that related to problem ?


The reason a problem with the EGR can create some really severe bucking is because the tune adjusts for the amount of recirculation that it is commanding. If that recirculation isnt there then both the fuel mix and timing go WAY off. So far off that they are out of range for adaptive learning to correct and that is what does it.

With the proper EGR flow the engine can run a lot more timing because the recirculated gasses actually cool combustion. Add that timing in to a hot and incorrect mix and you are going to get some ugly problems.

I have seen damage to transmissions from cars bucking due to a bad EGR system. It can literally hammer the extension housing off the back of the transmission. It just amazes me that people will drive something that runs like that.

In this instance I am betting on a COP though.

Darrin

[dac99011]

Do you recommend replacing all 8 COP or having FORD scan them and replace only the ones that are bad?

Thanks for the helpful insight!

[Bobmiddle]

Had what sounds like the same issue. it was the COPs. The shop scanned for any cones and none showed so the had to isolate each one individualy and found 3 that were going bad. I few mo later the bucking came back so i replaced the rest and no issues yet.

[RF Overlord]

I'm going to try and find a Chilton or Haynes manual but if you all have any first hand experience or things to watch out for, I'd appreciate the insight.Forget Haynes...they make great underwear but lousy manuals.

Seriously, Haynes manuals are very generic and frequently have inadequate, missing, or wrong info...and the pictures are next to worthless in many cases. Chilton's USED to be much better back in the day (30 years ago) but I haven't seen one recently to know whether they still are.

Your best bet is the HELM factory service manual. They're expensive new, but sometimes available on e-Bay for a reasonable price. Whatever you pay for it, it's worth it if you do a lot of your own work.

Replacing COPs is dirt simple. Remove the 2 bolts holding the coil cover on. Unplug the small connector on the side of the COP module. Pull the COP straight up and out. Reverse to install.

[dac99011]

Thanks for the helpful knowledge. Changing the COP was easy as pie.

The dealership confirmed cylinder #3 coil was bad and causing it to mis-fire (shuddering experienced). I replaced all the spark plugs and the coil for #3 and no more shuddering experienced.

I was able to find our COP's for ~$40 on RockAuto vs. $65 at dealership. If I experience the shuddering again, I'll replace the rest of them.

Thanks again.