Compression Ignition Addict
Join Date: Sep 2007
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Engine Dies When Brake Pedal Pressed
Ok - this one is getting me a little confused: Leaning towards CPS but want other things to check while I wait for a new CPS to come in. Plus it has some missing symptoms/odd peculiarities from the last time my CPS went out.
Truck dies when brake pedal is pressed - sometimes it stumbles then recovers when the brake pedal is pressed, but most often dies. Immediately restarts with no hesitation. Sometimes problem repeats itself, sometimes not.
I thought it might be when I go to put it into gear (worried about possible TC problems) but have been careful to observe and it only happens when I touch the brake - not when actually changing gears. Other thing is it will idle in park indefinitely - left it running in park for 2 hours the other day and it never had a single problem, hopped in and hit the brake and it died (reminds me of forgetting to put a key in the ignition after using the autostart to start the engine and hitting the brake)
Lastly, I have noticed that sometimes when it stumbles it recovers into what I call limp mode - most noticable is the absence of any display on my DP tuner when it does this recovery - solution is turn engine off and restart as this "limp" mode is barely enough to move the truck.
Now heres the really strange part - it seems to be worse when its cold out (-20° to -40°F) but does not have anything to do with the indicated engine temperature - ie the other day when I let it run for 2 hours the truck was at operating temperature before I ever hopped in (and it was only -20°F) However I can't recall it ever happening after parking it in a warm garage over night.
1. Fuel filter is just replaced about 1 month ago
2. Just replaced a broken fuel bowl heating element about 1 month ago (thought I was having wax plugging of filter because of the broken element)
3. Truck runs strong and does not stumble except when brake is depressed (ie I have NEVER had it stall out while coasting/driving/accelerating)
4. Had Ford recall for CPS done about 2 years ago and it solved a stalling problem I was having then too.
5. Autoenginuity is telling me no-codes set (SES light does not come on - but wait to start light does??)
My ideas are as follows so far:
1. Bad CPS
2. Bad PCM
3. Bad connection of DP tuner to PCM
4. Tranny fluid level/TC problems
5. Frozen Gremlin who wants me to park in garage more often.
Early 99 F250
DP Tuner Tunes/Autometer Gauges
4R100 Brian's Truck Shop Tranny/6.0 cooler
285 75 R16 Cooper ST-Max Stancor Relay
HPOP Crossover Line, 203°F Thermostat, Cold Weather Mods,
Wheel bearings updated to Late 99-03
-58°F, 250k+ miles and still Powerstroke (7.3)Loyal