manifold swap problem

**165falcon** · 10-19-2009, 07:44 PM

I just helped a buddy finish up his manifold swap went from stock to trick flow trackheat now when the rpms reach 3000 the engine starts to shut down ???????????????? the manifold is set for 75mm t/b and he has a 70mm, but the guy he got it from said it would be fine is this the problem or can it be something else please help Thanks

**FEandGoingBroke** · 10-19-2009, 08:17 PM

running out of fuel??

**PSIG** · 10-20-2009, 12:17 AM

Quote:

Originally Posted by 165falcon

...when the rpms reach 3000 the engine starts to shut down ???????????????? the manifold is set for 75mm t/b and he has a 70mm, but the guy he got it from said it would be fine is this the problem or can it be something else

Something else. Can I assume the ECU has been re-programmed to run properly with the new intake? More info would be helpful.

David

**165falcon** · 10-20-2009, 08:28 PM

no the guys at a performance shop here in town told him that it didnt need to be re -programed his motor is 30 over with th e303 motorsports cam it has 24 lbs injecters so i am not sure? dont know much about fuel injetion

**73FordDriver** · 10-21-2009, 07:45 AM

im new to fuel injection as well but im pretty sure the ecu has to be programmed to run the bigger TB

Ryan

**Beoweolf** · 10-22-2009, 08:03 AM

Quote:

Originally Posted by 165falcon

no the guys at a performance shop here in town told him that it didnt need to be re -programed his motor is 30 over with th e303 motorsports cam it has 24 lbs injecters so i am not sure? dont know much about fuel injetion

The MAF sensor does need to be changed, modified or replaced with appropriately cinfigured one that recognizes Injectors have been replaced with larger ones. There computer does not recognize that automatically. By default it assumes they are 19 lb's.You can change TB without modification of the computer, however - the TPS throttle position sensor, may or may not need to be monitored or adjusted. It should be a direct swap, but some people insist that you check it for correct voltage.

**BobsSleeper** · 10-22-2009, 08:43 AM

I would go back and retrace all the work that was done to install the intake. That in-stall should run perfect right out the box. (mine did) You might want to in-stall a adj fuel regular with a gage on the fuel line. (a must when you start modding on a EFI 5.0

**EUGENE477** · 11-02-2009, 07:10 PM

Put a fuel pressure gauge that you can see while driving and see what happens under a load. The pressure should spike when the throttle is wide open and should hold pretty steady.