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-   -   WOT not as good as 3 quarters why?? (http://forums.mustangworks.com/showthread.php?t=24896)

DemonGT 06-11-2002 12:18 AM

WOT not as good as 3 quarters why??
 
it seems if i give my car the nuts it go's but it seems if i push the pedal down but not quite all the way it goes better? why would this be?

LX XLR8R 06-11-2002 08:35 AM

hmm..TPS could be wayy off, you could have a fuel pressure problem, dirty air filter, timing not right..

PKRWUD 06-11-2002 08:57 AM

I'm curious to know what your TPS reads at idle, 3/4 throttle, and WOT.

Take care,
-Chris

jimberg 06-11-2002 10:29 AM

I notice that you have a 76mm C&L MAF meter. What MAF meter did you transfer your electronics from? Was it a working stock meter?

My guess is that your MAF meter isn't working properly so the engine runs fine in closed-loop mode since the O2 sensors are used for making fuel adjustments. When you go to WOT, which your computer is clearly picking up, it uses readings from the MAF sensor to determine how much air is coming in to calculate fuel delivery. Since it's not correct, it runs crappy.

PKRWUD 06-11-2002 11:19 AM

Good answer! I don't know if that's it or not, but it certainly could be. Good idea, Jim!!!

Take care,
-Chris

DemonGT 06-11-2002 01:11 PM

yes the electronics were from a working stock one...and also..some times when im coiming to a stop i push the clutch in and push on the brake some times my engine will rev go way down...rev then some times die!?? some times it dosnt die but almost dose...it seems as though it dose it more when the wheel is turned..like i was backing out of a parking spot and had the wheel cranked and it just died?? wtf..also..when i start it, it starts then almost dies..then goes up..then almost dies..then starts to even the idle out

how do i check my TPS?

jimberg 06-11-2002 01:23 PM

The symptoms you are describing lead me to believe that it probably is the MAF. When you do a cold start you are in open loop mode using just MAF readings to determine fuel quantities.

Do you have working cruise control?

DemonGT 06-11-2002 11:46 PM

yes..the cruise control works fine

iv been thinken of going with a pro M 77 MAF...is that a good size to get? i building a 331

jimberg 06-12-2002 07:28 AM

I have a Pro-M 75mm and it works great. It comes with brand new electronics, too. A 77mm wouldn't make much a difference over your 76mm, though. You should find someone with a similar MAF sensor and swap to see if it really is part of the problem. You may also want to try swapping out your electronics.

I just bought a used stock MAF sensor for $25. If it works for me, great, if not, I'm gonna use it as a core to get a brand new one since I gave my old one away a long time ago. I wish someone just sold the sensing unit separately.

DemonGT 06-12-2002 10:47 PM

yea the 75 is what im thinken of going with..i had a brain fart when i put 77...will the 75 work ok with a A trim?


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