NEED HELP 91 5.0 only runnin on 4 cyl

G

Gothic 5.0

New Member

Jan 30, 2009

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Jan 30, 2009

#1

• Jan 30, 2009

• #1

I just converted my 91 Mustang 5.0 from EFI to carb and it is only running on 4 cylinders. It is not running on cylinders 1,4,6,7. I installed a trick flow stage 1 cam, tw heads, eldelbrock intake, holley 650, MSD ing., MSD dist.#8598, electric fuel pump and cant figure out what is the deal with this thing. So i am hoping someone can send me in the right direction. Thank You, Cody

 

BlownFiveLiter

have car, will race....wait, it doesn't run

15 Year Member

Nov 29, 1999

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Chicagoland

Jan 30, 2009

#2

• Jan 30, 2009

• #2

Make sure your distributor isn't installed 180° out. It'll usually run, but it'll run terrible.

 

G

Gothic 5.0

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Jan 30, 2009

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Jan 30, 2009

#3

• Jan 30, 2009

• #3

What do you mean 180 degrees out?

 

BlownFiveLiter

have car, will race....wait, it doesn't run

15 Year Member

Nov 29, 1999

3,133

18

108

Chicagoland

Jan 30, 2009

#4

• Jan 30, 2009

• #4

Being 180° out means the distributor is installed with the shaft turned 180° from where it should be. If you set the engine to TDC on the compression stroke of the #1 cylinder, the rotor should be pointing at the #1 cylinder, if you remove the distributor cap. I'm suspecting that if you remove the cap, it's pointing at the #6 cylinder. That, or your firing order could be off. Verify that you have the firing order set to 1-3-7-2-6-5-4-8 for the 302 HO/351W firing order, not the standard 302 firing order of 1-5-4-2-6-3-7-8.

 

R

Rick James

Member

May 13, 2007

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burlington new jersey

Jan 30, 2009

#5

• Jan 30, 2009

• #5

StangGT1995 said:

Make sure your distributor isn't installed 180° out. It'll usually run, but it'll run terrible.

Click to expand...

+1 on the distributor

 

B

blown90notch

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Oct 16, 2008

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Jan 30, 2009

#6

• Jan 30, 2009

• #6

another thought is if you have some of your rocker arms tightened to much.it could cause the same effect.causing the valve to hang open a little.

 

G

Gothic 5.0

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Jan 30, 2009

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Jan 31, 2009

#7

• Jan 31, 2009

• #7

I will check that out