|
|
|
|
10-20-2015, 11:21 PM
|
#1 |
|
Senior Member
Join Date: Jun 2002
Posts: 924
Likes: 104
Liked 101 Times in 52 Posts
|
Re: starts breaking up at 4500 rpm.
This came with injection correct?
It breaks up with the injection but runs OK with the carb may be that it is running out of fuel. What is the pressure? Had the mass airflow sensor fail on my Buick and it would be ok under light throttle but was lost accelerating under load. It was fine one day and bad the next. At first I thought it was the gas I'd purchased but quickly discovered new fuel wasn't the answer. I'd think fuel first as Ken said. Does it break up even in neutral? I'm sure the other guys here know way more on this than me and can assist. My niece had a Mustang Cobra but it has been a few years since that was sold. |
|
|
|
10-21-2015, 08:48 AM
|
#2 |
|
VIP Member
Join Date: Dec 2002
Location: Lower Dakota territory
Posts: 1,180
Likes: 1,074
Liked 799 Times in 236 Posts
|
Re: starts breaking up at 4500 rpm.
The fuel returning to the tank can really aerate the fuel in the tank if you just let it dump back in. Try extending the tanks return fitting so the returning fuel is submegered....like a pick up tube in reverse.
__________________
"That'll never work....." Last edited by Alan Nyhus; 11-21-2015 at 09:04 AM. |
|
|
|
|
10-21-2015, 10:16 AM
|
#3 |
|
Member
Join Date: Nov 2008
Posts: 109
Likes: 0
Liked 0 Times in 0 Posts
|
Re: starts breaking up at 4500 rpm.
Just for grins, check your high end chip. I've seen this happen twice in recent years.
|
|
|
|
|
10-21-2015, 10:38 AM
|
#4 |
|
VIP Member
Join Date: Mar 2007
Posts: 2,462
Likes: 620
Liked 1,948 Times in 589 Posts
|
Re: starts breaking up at 4500 rpm.
Doesn't fuel injection take a higher pressure pump than a carb car or is there just a difference in the regulator. I was under the impression that fuel injection needs a lot more pressure than a carb
__________________
Mike Pearson 2485 SS |
|
|
|
10-21-2015, 11:44 AM
|
#5 | |
|
Senior Member
Join Date: May 2010
Location: Raleigh NC
Posts: 637
Likes: 27
Liked 254 Times in 78 Posts
|
Re: starts breaking up at 4500 rpm.
Quote:
__________________
Mike Moller NHRA 203 Q-R-T/SA Last edited by MikeMoller; 10-21-2015 at 11:47 AM. |
|
|
|
|
|
10-21-2015, 12:01 PM
|
#6 |
|
VIP Member
Join Date: Jan 2009
Location: Bardstown, KY
Posts: 1,941
Likes: 132
Liked 372 Times in 130 Posts
|
Re: starts breaking up at 4500 rpm.
40 psi for efi vs. 7 for carb.
__________________
Alan Mackin Stock 3777/ SS 3377 P/SA & SS/PA Fox Thunderbird I/PS '95 Mustang GT |
|
|
|
 |
| Thread Tools | |
| Display Modes | |
|
|
Hybrid Mode
