Missing-hesitating in rain?

[epe223]

Hello. We have a 08 f350 superduty that we use for work, and is my cousins personal truck otherwise. It has about 35,000 on it. One thing we have noticed is in the rain, between 40-55 mph it will stumble, and hesitate. Usually when the boost gauge is at 3. If you let off and get back on, it will clear. If you hold it steady, it will just keep stumbling. Has anyone else had this problem yet? Our local ford garage is a pain to deal with. Oh yeah, the truck is on its third radiator... Thanks for any input.

 

[bushpilot]

im not that familar w/ the 6.4 but id recommend checking for codes 1st.

the bucking/missing symptom almost
sounds egr related except for the RAIN.

I know on the 6.4 they had issue w/
SNOW blocking the airfilter intake.

the only PUBLISHED articles on the 6.4 that ive seen
are -->

FDDTS - High Pressure Fuel Lines
FDDTS - 6.4L High Pressure Fuel Pump Cover Gasket

 

[epe223]

The ford dealership said they knew there was a moisture issue with missing, but did not know what to do By the trucks build date was late may.

 

[bushpilot]

Although not RAIN related...

Im assuming BOTH fuel filters have been well
maintained & your draining the fuel / water separator
on a regular basis

 

[F350DRW1]

Any chance the air filter is getting wet? Seems like if snow could get in there, rain could also.

 

[epe223]

I am wondering that about the filter also. I think pre 09-07 have the bad filter intake setup correct?

 

[DutyCalls08]

Hey epe223,

You mentioned that the trucks build date was May of '07. Besides checking the filter for moisture and emptying the fuel/water separator, have you talked to the dealership about getting your truck flashed with the new tune? It may not be the issue, but it certainly couldn't hurt.

 

[kemorris]

Missing in the rain?

My 7.3L would miss / die but only in the rain. It was the CPS. Dealer said he had never seen that before.

Good Luck

 

[Reverend Jim]

I have the same problem on my 09. During heavy rains it will stumble and blow white smoke until I let off the throttle. Took it to the dealer and was told "they found nothing wrong". Imagine that! It happened again yesterday, I pulled the air filter and it was soaked!!! There was water still in the tube coming from the front of the truck, too. I called the dealer to let them know, and was told they'd look into it and get back to me. I'll let you know what I hear.

 

[hdjeff]

There was actually a tsb on this issue regarding trapped moisture inside the intercooler, do a search for it, i believe it came out in mid-late 09. Found it the TSB is 08-25-01

http://www.thedieselgarage.com/forums/attachment.php?attachmentid=16291&d=1232503959