4th & 5th Converter Lock = bucking/slipping - Ford Powerstroke Diesel Forum
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Old 07-29-2012, 01:43 PM
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4th & 5th Converter Lock = bucking/slipping

Originally posted this in the transmission section..............

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)
-no codes
-all engine parameters stay solid during the bucking
-FICM 50V+
-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)
-ARP's
-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.

Ideas?
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  #2  
Old 08-07-2012, 06:02 AM
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I went to the transmission shop yesterday. Transmission is fine.
We had a scanner hooked up for the ride. Not sure why it wouldnt show on my Edge Insight, but the ICP voltage was bouncing up and down when the truck was bucking.

I ordered a new ICP yesterday, should have it today.
But I wont have time to test the truck until tmrw.
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Old 09-10-2012, 05:18 PM
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Got the same problem.....subscribed!
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Old 09-10-2012, 08:35 PM
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Did you get your ICP in cRaZy8?
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Old 10-01-2012, 01:04 PM
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I am having same issue to a point. My bucking is not prejudice, it will do it all the time or anytime. Cold, hot, part throttle, WOT loaded or empty, just never know when it will happen or when it will stop. I just changed my transmission because the original one started eating itself due to extreme tunes and bad driving habits. So I am pretty confident in saying it is not a transmission issue since I still have the same issues unless it is the TC unit. I have a friend that had same issue but not quite as extreme and the dealership put 3 turbos on under warranty. Each time the problem would go away only to come back about 10k miles later. He eventually grew tired and warranty was running out so he traded for another truck. I really like my truck and have to much invested to walk away, so I am looking for solutions without throwing parts at it. I don't remember having this issue before I installed the EGR delete and cleaned the turbo. I am sure it won't be the first time a backyard mechanic screwed something up but I can't figure out what. Last year I replaced head gaskets again after studs???bad driving habits, and checked all the connections and turbo again. FICM reads 50+ volts KOEO, KOER and part throttle, replaced the teflon orings on dummy plugs in oil rails and installed new aftermarket oil cooler. Most issues should have been addressed but bucking continues. Any help would be appreciated. Thanks
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Old 10-12-2012, 12:24 PM
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IPR was the gremlin.
Took the truck to Long Island and back yesterday, towing a boat one way.
Never missed a beat.
ICP voltage never fluctuated, rock solid readings.
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Old 01-11-2013, 05:01 PM
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Hi - I just read your post and am feeling hopeful... When I'm on a level road or slight incline and in overdrive (5th) the engine shakes. (feels like one of the pistons is not firing - a kind-of off balance shaking that I can hear and feel) When I stomp on it and downshift it seems to go away. I have not had it diagnosed by a shop yet, but over the phone I was told it might have something to do with Transmission so I started searching the forum and found your post. Does it sound like I have the same issue?

Thanks
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  #8  
Old 01-11-2013, 06:07 PM
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Quote:
Originally Posted by call4jr View Post
Hi - I just read your post and am feeling hopeful... When I'm on a level road or slight incline and in overdrive (5th) the engine shakes. (feels like one of the pistons is not firing - a kind-of off balance shaking that I can hear and feel) When I stomp on it and downshift it seems to go away. I have not had it diagnosed by a shop yet, but over the phone I was told it might have something to do with Transmission so I started searching the forum and found your post. Does it sound like I have the same issue?

Thanks
Do you have a monitor? It will help you a lot with diagnosing.
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Old 01-12-2013, 07:26 AM
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No I don't have a monitor - would a monitor tell me if this is due to IPR?
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Old 01-16-2013, 08:17 PM
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Quote:
Originally Posted by call4jr View Post
No I don't have a monitor - would a monitor tell me if this is due to IPR?
Not exactly, but it will help you pinpoint the problem.
And could save you a bunch of dough on troubleshooting.
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