Join Date: Nov 2009
Location: Norwalk, CT
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4th & 5th Converter Lock = bucking/slipping
Ok, so I thought this was originally an engine issue.
My stupid @$$ didnt put the two together to realize its a trans issue.
Heres what happens-
-only on the highway
-noticeable on flat ground, but more so on a hill/incline
-only happens with slight throttle input (20-50% throttle, roughly)
-only after trans is up to 140* or higher
-only in 4th with lockup, and 5th with lockup (via Edge Insight)
-truck lunges/bucks/shakes with slight throttle application
-smash the throttle and it screams, no issues
-if you hold the throttle just to maintain speed (or decrease speed as you inclince), it wont do it
-much more noticeable with my boat in tow, higher load on engine/trans (boat, trailer, gear weighs about 5k)
-all engine parameters stay solid during the bucking
-RPM does not flicker
-ICP voltage solid
-HPOP psi steady
-Fuel pressure never drops below 59psi, usually steady at 61-63*
-ECT never above 195*, 205* max towing
-EOT never above 195*, 202-203* max towing
-Both near 189* while around town
Recent maintenance or upgrades since the issue started-
-Trans fluid drained around 75k (91k on clock now), new pan gasket, filter, and TP filter, Mercon SP, fluid level dead nuts in the middle the "H" when around 160*
-8 new injectors
-new frame mounted fuel pump
-BPD 53V FICM, 6phase unit
-BPD tested Logic board FICM
-IDP FICM tuner
-FICM wiring harness
-Shell T5 Rotella
-Shell Rotella ELC
-Fuel filters every 5k miles
-Front & Rear diff fluid changes
-Transfer case fluid change
-New HG's (Black Onyx failure)
-New OEM Ford turbo (not a rebuilt)
-IDP long Y-pipe (EGR delete pipe)
-Riffraff Diesel intercooler boots
You can see my sig for other mods.
As far as running goes, this truck is beast. Cold starts awesome, never misses a beat. Tons of power, never smokes. I get a puff of smoke on start up, but it clears up in 2-3 seconds. She blows a little haze on a hard run up the highway ramps, definitely not a cloud of smoke. She can handle around town towing in 100* temps with a 30ft Grady White (about 15k with trailer/gear) with no issues.
I am bringing it to a local tranny shop this week.
I went to the dealer a little while back, and brought a boat with me, and he hooked up the scanner for the test ride. I drove he watched. It acted up, and he said it was a fuel issue. Seeing that I have since replaced everything in the fuel system besides the tank and lines, I highly doubt that.
Seeing that the problem is only in 4th & 5th during converter lock, I am ruling this to a trans issue. Also, having no codes, and a dealer tech in the truck with a scanner, and not seeing anything.
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