High RPM cutout, backfire?!? Fuel Pump Going?
Thread Starter
Burning Brakes
Joined: Apr 2002
Posts: 934
Likes: 0
From: MO
High RPM cutout, backfire?!? Fuel Pump Going?
Took the Vette out today and my low rpm miss I experienced after installing the LTCC is gone!!! Ran Awesome for most of the day. I was trying to run some bad gas out. Got close to empty high rpm miss I thought maybe this was because I was low on fuel. Filled up and it did it again at about 6300 BANG!!! Loud Backfire out exhaust!
Could my fuel pump be going or is this something else? BTW the car pulls super hard until that range then lays flat on its face. Feels like fuel is cutting out.
Thanks for your Help!
Could my fuel pump be going or is this something else? BTW the car pulls super hard until that range then lays flat on its face. Feels like fuel is cutting out.
Thanks for your Help!
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
To rule out the fuel pump, tape a gauge to the windshield and observe the pressure drop as the revs increase. If it just drops at 6300, I'll bet you've hit the rev limiter, fuel shut off.
RACE ON!!!
RACE ON!!!
Thread Starter
Burning Brakes
Joined: Apr 2002
Posts: 934
Likes: 0
From: MO
Originally Posted by CFI-EFI
To rule out the fuel pump, tape a gauge to the windshield and observe the pressure drop as the revs increase. If it just drops at 6300, I'll bet you've hit the rev limiter, fuel shut off.
RACE ON!!!
RACE ON!!!
The Rev Limiter is programmed for 7300. I'll do the gauge thing though today and see what happens to the pressure. Thanks.
Thread Starter
Burning Brakes
Joined: Apr 2002
Posts: 934
Likes: 0
From: MO
Ok after driving today it doesn't always cut out at high rpms, about 1 outa 5 times it will. Will cut out at differnt rpms while cruising sometimes, seems like fuel just shutsoff for a quick sec then ok. Some times it did it multiple times in a row then runs just fine for another 30mins.
I think I'll change the filter and go from there.
I think I'll change the filter and go from there.
Team Owner
Joined: Apr 2004
Posts: 36,040
Likes: 4
From: All great change begins at the dinner table Ronald Reagan
Originally Posted by James94LT1
Ok after driving today it doesn't always cut out at high rpms, about 1 outa 5 times it will. Will cut out at differnt rpms while cruising sometimes, seems like fuel just shutsoff for a quick sec then ok. Some times it did it multiple times in a row then runs just fine for another 30mins.
I think I'll change the filter and go from there.
I think I'll change the filter and go from there.
I changed the plugs (was running rich, tips were dark) and it cleaned right up. If you have any exhaust manifold leaks, tighten it up.
Last edited by redvtt; Oct 9, 2004 at 03:26 PM.
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