backfiring after o/r x install

1994Vib.RedGT

Member

Aug 19, 2004

585

0

16

Denver, CO

Jun 20, 2005

#1

• Jun 20, 2005

• #1

I just recently installed my bassani o/r x and ever since I have, when I downshift, or rev in neutral up past about 2500~3000 RPM I get backfiring. Especially if I downshift and the revs go up to about 3000 it sounds like a gun going off, why is this??? Does it have something to do with the lack of cats?

 

marine_2003

Member

Jun 6, 2005

427

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16

Lake County, FL

Jun 20, 2005

#2

• Jun 20, 2005

• #2

After installing you need to change the timing.

 

1994Vib.RedGT

Member

Aug 19, 2004

585

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16

Denver, CO

Jun 20, 2005

#3

• Jun 20, 2005

• #3

I just did that 3 days ago when I installed new plugs and rotor/cap. timing is at 10 degrees, timing chain is one month old, timing is a non-issue, other opinions?

 

9

90bronconate

New Member

Apr 24, 2005

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0

Phoenix, AZ

Jun 20, 2005

#4

• Jun 20, 2005

• #4

marine_2003 said:

After installing you need to change the timing.

Click to expand...

???

 

J

JJPA

New Member

May 3, 2005

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Lancaster,PA

Jun 20, 2005

#5

• Jun 20, 2005

• #5

Im not 100 percent positive but it could be because of the lack of cats. How about disconnecting the negative battery cable to reset the computer. I dont think timing should be an issue.

 

90_Red_LX

Member

Sep 29, 2003

668

5

19

Asheboro, NC

Jun 20, 2005

#6

• Jun 20, 2005

• #6

Hmm, mine doesn't really backfire unless I run 2nd gear up hard and let out real quick, so I don't know. You may be runnin a little bit rich. Does it do it at WOT? I usually just get these little "pop" sounds.

 

ALMOSTFINISHED

Member

Jan 8, 2004

315

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17

Westchester County NY

Jun 20, 2005

#7

• Jun 20, 2005

• #7

Is it backfiring on acceleration or deceleration? If its on deceleration its probly just from lack of backpressure and more frreeflowing exhaust. What mufflers are you using?...scratch the muffler question, just read the sig. What size piping tailpipes do you have? possible popping from a 2 1/2 inch to 2 1/4 inch tails??

Nick

 

RYC CUKR

Founding Member

May 19, 2002

1,437

1

38

Orlando

Jun 20, 2005

#8

• Jun 20, 2005

• #8

On the first O/R H I put in I had a few exhaust leaks and it would pop and backfire pretty bad on deceleration. Went through and tightened everything down really good and it took care of most of it. Still had a little popping on deceleration but not nearly as bad.

That said the 93 I have now pops on decel pretty good. I know that it is running rich and that is part of the problem but even when the mixture was good it would pop some. Kinda part of havin an O/R pipe.

 

1994Vib.RedGT

Member

Aug 19, 2004

585

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16

Denver, CO

Jun 21, 2005

#9

• Jun 21, 2005

• #9

the popping is not bad, it is the gunshot sounding backfires during downshifts that bother me.