rpm drop at 70+ mph

motorhead6776 · February 16th, 2008, 12:22 AM

ok so say im getting on the highway and theres no one there and go WOT all the way thru 3rd and most of 4th so im doing about 95 100 mph.

from there i go to neutral and my rpm drops all the way to 600 and proceeds to bounce around between 300 and 800 occasionally requiring me to hit the gas to keep it from stalling.

once im below 70 its fine and sits at a steady 900 - 1100 rpm.

what could be causing this?

*edit shifted at 4500 - 5000 if it matters. and it does this every time not just once in a while.

El_Cangri · February 16th, 2008, 12:52 AM

and you have a?

manual?

and idk.. maybe bad maf reading but thats just a lame guest of mine lol..

HMUSN · February 16th, 2008, 12:27 PM

that's supposed to happen.

when you shift into neutral all your doing is getting air in and not fuel .. your maf is trying to compensate by adjusting rpm.. your basically confusing your MAF when you do that.

February 16th, 2008, 12:22 AM	#1
motorhead6776 Enthusiast 2003 Mustang 15.00@93.06 Join Date: Oct 2006 Location: Plaistow NH Posts: 546 iTrader: 1 reviews	rpm drop at 70+ mph ok so say im getting on the highway and theres no one there and go WOT all the way thru 3rd and most of 4th so im doing about 95 100 mph. from there i go to neutral and my rpm drops all the way to 600 and proceeds to bounce around between 300 and 800 occasionally requiring me to hit the gas to keep it from stalling. once im below 70 its fine and sits at a steady 900 - 1100 rpm. what could be causing this? *edit shifted at 4500 - 5000 if it matters. and it does this every time not just once in a while.

February 16th, 2008, 12:27 PM	#3
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	that's supposed to happen. when you shift into neutral all your doing is getting air in and not fuel .. your maf is trying to compensate by adjusting rpm.. your basically confusing your MAF when you do that. __________________

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