347 power problem

4

4lug

New Member

Aug 3, 2002

18

0

0

Huntington Beach

Apr 18, 2004

#1

• Apr 18, 2004

• #1

I just installed a new 347 the following E cam stock heads with roller rockers stock upper and lower manifold with 1 inch spacer 24 lbs injectors 155 fuel pump adjustable fuel regulator set at 39 psi 24lb 76 mm c&l mass air meter and k&n cone 65mm throttle body.When i get to 3 grand it goes flat no power i have to back off to get power. Could it be vacuum or computor problem

 

Matt90GT

Founding Member

May 6, 2001

3,055

0

0

Oregon

Apr 18, 2004

#2

• Apr 18, 2004

• #2

Vacuum will usually show up as a bad idle + you could have a stiffer brake pedal.

Most likely it is in the MAF sensor. Try turning that about 30* to see if it helps.

Also is the fuel with or w/o vaccum?

 

86T-Top

Founding Member

Jun 29, 2001

553

0

17

Dublin, PA

Apr 19, 2004

#3

• Apr 19, 2004

• #3

I'm no expert, but I think the fact that you are running stock heads and stock intake is killing you. I don't think it is a vaccum problem since you didn't state that the car was idling poorly or running rough. You need an intake and heads that can flow more air for the 347, you are running parts that were designed for a 302, and they are restrictive for a 302 at that.

Mario

 

NeQX

Founding Member

Sep 30, 2002

904

0

0

Infront Of You, NY

Apr 19, 2004

#4

• Apr 19, 2004

• #4

Is this serious?

 

Matt90GT

Founding Member

May 6, 2001

3,055

0

0

Oregon

Apr 19, 2004

#5

• Apr 19, 2004

• #5

You can run stock heads and intake on a 347. Ford did it with the 351s. That is not the problem.

Seriously look into the MAF first. Did you get the right sampling tube installed?

 

bluelx347

Member

Jan 14, 2004

61

0

7

chicago

Apr 19, 2004

#6

• Apr 19, 2004

• #6

It could also be a fuel problem. You might be running out of fuel when you get to 3 grand. I am just in the midst of building one and i've hurd you need at least 30 lb injectors. hope this helps