Was wondering what I could do about this problem

When going down a hill, at higher rpm -2500-3500(high vac), I hear POP, POP, POP, BANG! (Ooo reminds me of old school Batman lol)

I assume its raw fuel igniting in the exhaust as im decelerating. My question is how the hell do I fix that?

I no my Fuel Pressure is too high for my injectors (310 cc Accell’s) Im hitting 40 psi at idle. Could high FP be causing that loud popping?

Any ideas please

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http://forums.kaptainmyke.com/index.php?act=Attach&type=post&id=32830
"Oh yea, well...My manifold does cool twisty things"

Originally posted by xtrickedeclipsex
Could high FP be causing that loud popping? Any ideas please

yes.

Turn down the fuel pressure.


95 Eclipse RS : 5 speed
15.7 @ 87.9mph
Jeep TB writeup - http://www.dimensia.com:81/jimbo/JeepTBfor2gnt.html

my car is stock. and it does that..... ehhhh.

Rule of thumb...

backfire out the exhaust is too rich
backfire out the intake is too lean

Terry

96 Eagle talon ESI
Star Stage II - Boost/oil/EGT gauges

97 Eclipse
Greddy header - Apexi N1 3" exhaust - SFMU/return line - Stage 2 6 puck Sprung hub MIBA clutch - Shortened shifter - Koni Yellows w/eibach prokit - Stillen Fr/Rr swaybars - ceramic intake - DEI Keyless entry alarm - Niche 17" Shoks

Waiting to be installed: Apexi AFC, HKS EVC IV, 450 Turbo injectors, GSX Front brakes (need rotors)

Mitchell on Demand copies available

When you are compression braking, this is completely normal and expected. You don't need to adjust anything.

Originally posted by DarkOne
When you are compression braking, this is completely normal and expected. You don't need to adjust anything.

wow, i have a feelings im going to get bashed on for this...but i dont get what you ment? compression braking? whats that? that poping is not comming from my brake's....its a backfire.... :scratch
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"Oh yea, well...My manifold does cool twisty things"

Originally posted by xtrickedeclipsex

Originally posted by DarkOne When you are compression braking, this is completely normal and expected. You don't need to adjust anything.

wow, i have a feelings im going to get bashed on for this...but i dont get what you ment? compression braking? whats that? that poping is not comming from my brake's....its a backfire.... :scratch --------------------------------------- http://forums.kaptainmyke.com/index.php?act=Attach&type=post&id=32830 "Oh yea, well...My manifold does cool twisty things"

compression braking is when ur coasting, in gear but not on the throttle, and using the motor to slow you down. This pulls the cylinders and could/would cause what your discribing.

Brakes arent at play here

Well, i no that its not normal...It honestly sounds just as loud as a shot gun at times....What can be done to fix this?

There might be a small hole in your exhaust.

i wouldent doubt that..buit a pop that loud?
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"Oh yea, well...My manifold does cool twisty things"

turn your car off while slowing down. or put your stock muffler back on.

If you dont want to address the problem (if there is one, I dont know) just stick it in nuetral when coming to a stop. Thats what I do around town to avoid making my car shake to much from the mounts and my muffler. Just a band-aid solution though.

yea, i thought about that, i have a 3 inch stright back no cat no anything...but still, it did not used to do it this bad, does everyone with a 3 inch turbo back pop loud as hell as when using your gears slow you down?
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"Oh yea, well...My manifold does cool twisty things"

I backfire quite often now decelerating since I put the 440's in my car also.......seems somewhat normal.

When I was going through MAP sensor problems, my car backfired a lot when compression braking. A little is expected, but loud banging and flames coming out of the back was kind of unreasonable.

If the car is stock and this happens, I'd check the MAP sensor and possibly the oxygen sensor.