Backfiring like crazy when deceleration on a slight hill..

BlackFox5.0

Founding Member

Aug 7, 2000

3,514

1

0

Massachusetts

Apr 16, 2004

#1

• Apr 16, 2004

• #1

I don't know what could be causing it except having more fuel maybe? I just put in 36# injectors and a 255lph high pressure pump, and now it seems to back fire a little bit more than before I put just the pump in. It was doing it with the injectors alone, but now it's really loud. Is this a bad thing? what is causing it and how can I stop it?

I also have an A-trim pushing 5-6psi, timing set at 10*, 93 Octane, and Autolite 23's @ .035"

 

SCORPION

New Member

Mar 2, 2004

386

0

0

Seaford, DE

Apr 16, 2004

#2

• Apr 16, 2004

• #2

what kind of exhaust do you have? alot of times it is caused by a leak and/or your system itself

 

J

jerry beach

Founding Member

May 20, 2002

2,671

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46

Ocala,FL

Apr 16, 2004

#3

• Apr 16, 2004

• #3

Have you read the plugs? Is it backfiring through the exhaust or the intake? Are you talking about popping through the exhaust, or real loud backfires, like gunshots? Some popping can be caused by small exhaust leaks, or a short exhaust system. Mine pops some on decelleration, or during a shift, but there is nothing wrong with it. Does it accelerate fine?

 

BlackFox5.0

Founding Member

Aug 7, 2000

3,514

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0

Massachusetts

Apr 16, 2004

#4

• Apr 16, 2004

• #4

I have a mac catback, my h-pipe has a hole in the part that connects both tubes together, but I patched it. I don't have any other exhuast leaks other than that.

I can hear a hissing around my intake somewhere after I shut the motor off, but not exactly sure from where. I tried to find it but can't pin point it, aos i have no idea where it's coming from, would a vacuum leak cause this maybe?

 

BlackFox5.0

Founding Member

Aug 7, 2000

3,514

1

0

Massachusetts

Apr 16, 2004

#5

• Apr 16, 2004

• #5

It's through the exhaust. It's a very loud popping sound and it does it a lot. I can accelerate fine.

 

BlackFox5.0

Founding Member

Aug 7, 2000

3,514

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0

Massachusetts

Apr 16, 2004

#6

• Apr 16, 2004

• #6

It does it mostly when decelerating down a slight hill btw.