Another trans issue.
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Fleet Mechanic
Joined: Dec 2010
Posts: 1,546
Likes: 9
From: Wellington, Co
Another trans issue.
I need some help with this please. Driving normal, in town or 40-50 mph, stop to put in reverse, and sometimes engine dies, sometimes acts loaded up? Like torque converter locked up? When it dies, takes a couple of restarts and then all is okay. Has been doing this off and on for a few years. I originally blamed the tuner, but changed out a couple of times (D5 to Hydra to D5 and Hydra now). Did it to me in stock setting last week. I can back up like this but truck is shuddering like really under a load, just like a torque converter still locked up? No codes, at least no blinking light. HD4R100, 25K on it. I don't remember having done this before trans install. Fluid all good, shifts good, etc. Replaced shift tube bushings, tightened up shift lever, etc. . Something with the range sensor? Or worse? Won't do it every time, but enough to really be a problem sometimes. Thanks.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
Likes: 2,658
From: SE Florida
It can't be the range sensor. The torque converter clutch can apply when line pressure drops. Pressure can drop from low fluid, loose/missing internal filter, internal leaks, worn pump, or a bad torque converter.
A good diagnostic would be to install a 0-350 PSI gauge in the test port and see what the pressure does when reverse is engaged. You need a gauge with a 1/8" NPT thread.
A good diagnostic would be to install a 0-350 PSI gauge in the test port and see what the pressure does when reverse is engaged. You need a gauge with a 1/8" NPT thread.
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Fleet Mechanic
Joined: Dec 2010
Posts: 1,546
Likes: 9
From: Wellington, Co
Thanks Timmy Boy, level has always been good, and I agree to be sure any chip should be removed. Thinking I eliminated that between the two different chips.
Okay Mark, you killed my easy hope! I do have a 400 psi gauge, test port location? Guessing should be warmed up, operating temp? PSI I am looking for?
Okay Mark, you killed my easy hope! I do have a 400 psi gauge, test port location? Guessing should be warmed up, operating temp? PSI I am looking for?
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Fleet Mechanic
Joined: Dec 2010
Posts: 1,546
Likes: 9
From: Wellington, Co
Likewise thanks Mark. Good numbers to have. I realized later that the test port is where my temp gauge is plugged in, so I know where to look. I am going to guess on the stall, when the truck starts moving, foot on the brake and throttle up? I am an old drag racer.
Tom.
Tom.
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
Likes: 2,658
From: SE Florida
Stall is right foot on the floor with the left foot on the brake keeping the truck from moving.
CAUTION: DO NOT HOLD STALL FOR MORE THAN 5 (FIVE) SECONDS AT A TIME. IDLE OR FAST IDLE IN PARK OR NEUTRAL FOR AT LEAST 30 SECONDS AFTER EACH STALL READING.
Holding stall too long can get the torque converter hot enough to melt internal parts.
CAUTION: DO NOT HOLD STALL FOR MORE THAN 5 (FIVE) SECONDS AT A TIME. IDLE OR FAST IDLE IN PARK OR NEUTRAL FOR AT LEAST 30 SECONDS AFTER EACH STALL READING.
Holding stall too long can get the torque converter hot enough to melt internal parts.
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Lead Driver
Joined: Sep 2010
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Cool..thanks Mark
Anything yet, Trek? This autos' a new ballgame for me so hope you didnt mind my questions, bud..i screwed up when changing fluids/flush and filter, that i didnt check them feed bolts but havent experienced an in gear no movement..
Anything yet, Trek? This autos' a new ballgame for me so hope you didnt mind my questions, bud..i screwed up when changing fluids/flush and filter, that i didnt check them feed bolts but havent experienced an in gear no movement..
Thread Starter
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Fleet Mechanic
Joined: Dec 2010
Posts: 1,546
Likes: 9
From: Wellington, Co
So, with an embarrassed face, I have to admit something. For some reason, I thought these were checked with engine off!! I do not remember where that came from. In checking all the other posts, noticed should be checked engine idling, in park, warm. I put another qt and a half in trans, and have been trying to make it act up, so far so good. I never thought being a little low would do this, no other issues noticed. If I can get it to act up, will do the psi test, maybe drop the pan, etc.
For those who have changed only the pan fluid, drain using drain plug, what is the amount of atf you have put back in?
For those who have changed only the pan fluid, drain using drain plug, what is the amount of atf you have put back in?
Lead Driver
Joined: Sep 2010
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Likes: 50
Haha..i hold that card too. Did the flush/filter replacement and thought all was good until leaving the neighborhood. Came to a stop and truck lunged right out into the middle of intersection..came back and put more fluid in. Been great for a year
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,354
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From: Lake Hartwell, GA
Some of the newer vehicles come with 4 marks on the transmission dipstick. 2 for cold engine sitting level with engine off and 2 for hot engine sitting level with engine running.
Lesson learned, hopefully that was the problem.
Lesson learned, hopefully that was the problem.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
Likes: 2,658
From: SE Florida
Don't ever trust the cold setting. It is NOT accurate. Also, it will be WAY off if you check it cold with the engine off. If you check it cold with the engine running you'll only be a quart or two off the actual reading. Checking the fluid level with the engine off is ALWAYS meaningless.
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