RPM's dropping after shifting under hard accel. - Ford Powerstroke Diesel Forum

 
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post #1 of 3 Old 01-15-2010, 07:17 PM Thread Starter
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RPM's dropping after shifting under hard accel.

On my early 1999 7.3l I'm having a strange drop in rpms after the transmisson changes gears when under hard acceleration. After the shift occurs there's the obvious rpm drop due to the change in engine speed in the next gear. It's after about 2 seconds of the engine rpm's spooling back up under hard acceleration when it falls back in rpms. I can't see much of a change on the tachometer (maybe 100 rpms), but it's very obvious when listening to the engine.

I have no modifications except an hpx crossover and there's 200,000 miles on the engine.


Does anyone have any idea what the cause could be?

Last edited by cutlass; 01-15-2010 at 07:22 PM.
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post #2 of 3 Old 01-15-2010, 07:36 PM
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slipping converter maybe?

2008 F250 6.4 CC SB Fx4
Gearhead tunes, flopro exhaust,AFe intake
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post #3 of 3 Old 01-15-2010, 09:00 PM
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Not enough fuel for the turbo. Get a custom tuned chip

99.5 F-250 Lariat 4x4 CC
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