4.6 woes

bukshot429

New Member

Feb 16, 2009

5

0

0

Clinton, IN

Jun 17, 2009

#1

• Jun 17, 2009

• #1

My bone stock 2003 4.6 GT is givin me troubles. Occasionally the car wont start without a couple tries. Some times when I fire it it will start with a cylinder layin down. At idle it's got a random miss, although under acceleration it fires on all 8. Mileage has dropped 2-3 mpg.

I've put in new plugs, ran some fuel system/injector cleaner through it, and cleaned the MAF with no results.

Any ideas?? I'm pretty new to the whole EFI late model scene.

 

the98stang

Active Member

Aug 12, 2005

2,408

0

47

Clovis, CA

Jun 18, 2009

#2

• Jun 18, 2009

• #2

bukshot429 said:

My bone stock 2003 4.6 GT is givin me troubles. Occasionally the car wont start without a couple tries. Some times when I fire it it will start with a cylinder layin down. At idle it's got a random miss, although under acceleration it fires on all 8. Mileage has dropped 2-3 mpg.

I've put in new plugs, ran some fuel system/injector cleaner through it, and cleaned the MAF with no results.

Any ideas?? I'm pretty new to the whole EFI late model scene.

Click to expand...

Make sure the COPs are working

 

squeak93

15 Year Member

Jun 2, 2005

2,256

358

164

Joplin, Missouri

Jun 18, 2009

#3

• Jun 18, 2009

• #3

Any codes?

 

1987stangman

Member

Jul 12, 2006

684

24

19

Jun 18, 2009

#4

• Jun 18, 2009

• #4

+1 for codes, but I had the same issue on my 96' with the turning the key twice thing until last weekend when I had to drop the tank to put a new doughnut gasket in the filler neck hole I also decided to put a new fuel filter in just because it was easy to get to and the problem went away for me.

 

bukshot429

New Member

Feb 16, 2009

5

0

0

Clinton, IN

Jun 18, 2009

#5

• Jun 18, 2009

• #5

Its not showin any codes. I'll try the fuel filter this weekend. Any other ideas are more than welcome. I'm startin to have second thoughts about this modern technology.

 

Skud

Member

Sep 10, 2003

493

0

17

Saskatchewan

Jun 18, 2009

#6

• Jun 18, 2009

• #6

My '02 GT has had the same starting problem since new. Sometimes it takes two or three tries to get it started. Sometimes it will sputter and die on the first or second attempt. On the third it will lazily start like it's running on 4 cylinders and be fine after it goes past 1000 rpm..

Still does it even with extensive mods (built motor, longtubes, basically everything in my sig..)

It did maybe once in every 10 starts. Always when the car was hot.

Riley