my baby ain quite right

[chadwilly]

I have a 2000 gt. I have changed the following new maf iac tp sensor throttle boddy plenum intake manifold headers cat mid pipe borla cat back and fuel injectors 24lb and when my car starts cold it runs at 800 rpm smooth then when it warms up it surges between 300 and 1500 about three or four times and dies. if i keep bliping gas it will run and has tons of power please help if you can.

 

[forum155pl]

sounds like a vaccume leak

 

[chadwilly]

jegs tech support told me obd2 had to be reprogramed by ford and ford told me they cant change programing have to find speed shop so no vaccume leak but thanks any other ideas

 

[BennyBlown2v]

Uhm try putting your stock fuel injectors and maf back in??? Why did you upgrade maf/fuel injectors, you really don't need to and they won't gain you any power on a stock-ish NA setup

 

[nyuk98gt]

chadwilly:

Any codes? Do you have access to a datalogger? Datalogging would be really helpful. Have you checked that everything is plugged in correctly (unplug and reseat the connector for each sensor)? Have you checked that voltages and signals are correct at the TPS, IAC?

Chris

 

[chadwilly]

well i plan on doing the heads and cams this spring in next couple months and then planed on supercharger or turbocharge this fall

 

[chadwilly]

only code i got was a p1000 saying obd2 system has not completed checks and no maf codes even though i unplug it. what is weard is when i unplug maf car will idle even though its ruff so i put old maf on and it does same thing

 

[forum155pl]

thats cuz your car doesnt even know what way is up right now.. when you unplug your battery for a period of time it clears everything and your computer has to re calibrate.. bigger injectors are for more fuel when adding forced induction or nitrous... you car will run just fine with your old 19lb. stuff

 

[chadwilly]

so even though i am doing heads and cams u dont think they will need more fuel i can just use stock maf and sotck injectors or what

 

[forum155pl]

exactly.. i have a PI headswap.. i assume thats what your talking about.. and it runs great .. pretty much its overkill for no reason (no HP gain)

 

[chadwilly]

I am a little new with performance but i am trying to figure out what heads and cams to pick. I want performance but street legal. what u mean by pi headswap is what i want i think . any idea on how to pick my heads and cams and thanks for your help i appreciate it

 

[forum155pl]

you need to hit the search button for that info.. that little guy is your buddy, you wont get the answers you want unless you search first..

good luck with your car man! stangnet has taught me alot!

 

[Rusty67]

Your stock injectors will be just fine unless you get a set of heads that have a serious port job and you have an intake to match. I would suggest geting yourself an adjustable fuel pressure regulator and an Anderson PMS. Take that thing to a legit shop with a dyno after your headswap/cams and get some extra HP out of the motor. Hell, you could provably pick up some HP with just the PMS, fuel regulator and a dyno tune right now.

 

[chadwilly]

well I will put back stock injectors and clear computer today so i post results tonight thanks for the help guys.

 

[the98stang]

well I will put back stock injectors and clear computer today so i post results tonight thanks for the help guys.

if that doesn't work search for a vacuum leak with a butane/propane torch. The car idle will surge if you find the leak.

 

[Rusty67]

or carb cleaner...

 

[chadwilly]

thanks man i put the old 19# stuff back on and it runs killer for whats been done now i just cant wait to finish doing the motor and suspension anyway I thank everyone agian