backfire??

[SLinse]

The other day I got bored and decied to stright pipe the truck. After doing so I noticed it now backfires. It only happens when I'm at WOT and when it shifts. I'm not sure if it's coinsidence, or my truck is just having issues. I did a search and it looks like a fuel filter change is the recommended solution. Anyone else with this problem?



oh ya, the straight pipe sounds pretty good!

 

[ROADWARRIOR]

Are you sure the sound you are hearing isn't just the turbo unloading fast. When I straight piped my '97 and then my '99, I was able to hear a very loud air rush sound between shifts. It is the turbo slowing down fast when you take the load off the engine. It doesn't hurt anything.



Dan

 

[SLinse]

Since I removed my silencer ring I haven't herd the turbo bark you are referring to.



This is deffanitly out the exhaust pipe, and it is a pop noise. not real load, but noticable. Tomarrow I'm going to pull the box off to see what that does.

 

[ttreibel]

Turbo bark is no joke you can snap the main shaft and watch 1K flush down the toilet. You should look into a pop off if your turbo is barking that much.

 

[Peter Campbell]

Or lift slower

 

[mattymac]

Ive understood that a higher fueling box can accelerate this problem My truck has done this once, its a misfire not back fire. It almost sounds like a black cat firecracker on steroids out the exh. pipe. I believe its atributed to the lift pump pressure getting sucked down to zero causing a fuel supply issue to the injectors causing a missfire and thus making the loud POP noise. The pop noise in other trucks ive heard of is rare (they can suck down the pressure to 0 and may not do it) but I believe that the pilot injetion plays a role in this noise as well (pilot injection shuts off at certain rpms). I could be wrong though too?

 

[SLinse]

Mattymac,

The sounds like it could be it!! Miss fire is probably a better way to describe it. Mines not real loud, but you can hear it. I bought a couple fuel filters and we'll see if that helps. I can't beleive the price of fuel filters at the dealer!! $30 a piece!! OUCH! They were the only place open, so I guess I'm going to have to shop around next time!

 

[Jengle]

For any filters, use Geno's. They have the best prices on the good filters.

 

[SLinse]

well I put in the new fuel filter and problem solved!!! That filter was NASTY!!!!! I might have got bad fuel. That was an easy fix!



That makes sense as to what mattymac was saying. With a plugged filter it wasn't getting enough fuel and probably causing a missfire rather than a backfire! Thanks for the help!