# Misfireing **URL:** \ **Category:** SON240sx Automotive\ **Created:** [December 8, 2007, 9:34am UTC](https://forums.speedlife.net/t/misfireing/111694 "2007-12-08T09:34:08Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![yuri\_maslin](https://avatars.discourse-cdn.com/v4/letter/y/0ea827/32.png) [@yuri\_maslin](https://forums.speedlife.net/u/yuri_maslin)\ **Post date:** [December 8, 2007, 9:34am UTC](https://forums.speedlife.net/t/misfireing/111694/1 "2007-12-08T09:34:08Z")
I have a SR20DET blacktop and recently I was pushing my car and after about 5000 RPM it starts to misfire or backfire very fast and the car doesn’t pull anymore until I shift. I have no idea what it is. If anyone knows what it could be please let me know. Thank you ---
**Author:** ![Pants](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/pants/32/5590_2.png) [@Pants](https://forums.speedlife.net/u/Pants)\ **Post date:** [December 8, 2007, 10:02am UTC](https://forums.speedlife.net/t/misfireing/111694/2 "2007-12-08T10:02:48Z")
plugs ---
**Author:** ![rex\_thugs](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/rex_thugs/32/5598_2.png) [@rex\_thugs](https://forums.speedlife.net/u/rex_thugs)\ **Post date:** [December 9, 2007, 12:21am UTC](https://forums.speedlife.net/t/misfireing/111694/3 "2007-12-09T00:21:03Z")
yea i would start off with checking the plugs check both sides the tip and the white ceramic part i had a problem with my plugs the ceramic side cracked i kept checking the tips, if u have replaced them or they are good still then check for a leak in ur intercooler system maybe u mite have to tighten a clamp or something. i had put a new bov and had a very small leak from when i put the hotpipe back on and it back fired on full throttle around that rpm so yea. ---
**Author:** ![ymaslin](https://avatars.discourse-cdn.com/v4/letter/y/2acd7d/32.png) [@ymaslin](https://forums.speedlife.net/u/ymaslin)\ **Post date:** [May 11, 2008, 4:31pm UTC](https://forums.speedlife.net/t/misfireing/111694/4 "2008-05-11T16:31:45Z")
I just put new plugs in and it worked fine but now it got worse and the engine either backfires or just chokes and cuts off all power until i let go of the gas pedal. We checked the MAF cleaned it with break fluid and it helped a bit but now it backfires less and just cuts off now. I’m gonna check the BOV and the intercooler. Thanks for the help. ---
**Author:** ![Sky14](https://avatars.discourse-cdn.com/v4/letter/s/bcef8e/32.png) [@Sky14](https://forums.speedlife.net/u/Sky14)\ **Post date:** [May 11, 2008, 4:43pm UTC](https://forums.speedlife.net/t/misfireing/111694/5 "2008-05-11T16:43:25Z")
i had the same problem. i took apart my maf to find out it was in half. and wasnt a fully functioning maf. i changed that and it runs like a champ now. and check ur bov. cus i know ever sicne i went back to my old bov my car fellt laggier ---
**Author:** ![renegade141](https://avatars.discourse-cdn.com/v4/letter/r/ba8739/32.png) [@renegade141](https://forums.speedlife.net/u/renegade141)\ **Post date:** [May 11, 2008, 6:05pm UTC](https://forums.speedlife.net/t/misfireing/111694/6 "2008-05-11T18:05:38Z")
what is your fuel pressure at and how high is your boost ?? ---
**Author:** ![CrypticNissan](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/crypticnissan/32/5663_2.png) [@CrypticNissan](https://forums.speedlife.net/u/CrypticNissan)\ **Post date:** [May 11, 2008, 6:24pm UTC](https://forums.speedlife.net/t/misfireing/111694/7 "2008-05-11T18:24:38Z")
its your MAF… too much fuel not enough air…not reading properly… thus the back firing its going right into your exhaust instead of the plugs igniting it all… thus a slight flood = no spark (your lagg and stutering) but instead of killing the motor it gets pushed down the exhaust… and manages to ignite enough to stay alive ---
**Author:** ![simplemind7](https://avatars.discourse-cdn.com/v4/letter/s/0ea827/32.png) [@simplemind7](https://forums.speedlife.net/u/simplemind7)\ **Post date:** [May 11, 2008, 8:49pm UTC](https://forums.speedlife.net/t/misfireing/111694/8 "2008-05-11T20:49:18Z")
sounds like a boost leak to me. ---
**Author:** ![DJPyro](https://avatars.discourse-cdn.com/v4/letter/d/278dde/32.png) [@DJPyro](https://forums.speedlife.net/u/DJPyro)\ **Post date:** [May 12, 2008, 6:53am UTC](https://forums.speedlife.net/t/misfireing/111694/9 "2008-05-12T06:53:47Z")
Yeah if you cleaned your MAF and put new plugs in, definitely check for boost leaks. ---
**Author:** ![ymaslin](https://avatars.discourse-cdn.com/v4/letter/y/2acd7d/32.png) [@ymaslin](https://forums.speedlife.net/u/ymaslin)\ **Post date:** [May 12, 2008, 12:41pm UTC](https://forums.speedlife.net/t/misfireing/111694/10 "2008-05-12T12:41:00Z")
Yeah I think I’ll change my MAF and check for a boost leak. It has to be one of those two because they are the ones that keep popping up. I also heard that I should change my Fuel Pump and Fuel Filter. Thanks for the help everyone I’ll have an update on the situation soon. ---
**Author:** ![Gongster](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gongster/32/5615_2.png) [@Gongster](https://forums.speedlife.net/u/Gongster)\ **Post date:** [May 12, 2008, 8:10pm UTC](https://forums.speedlife.net/t/misfireing/111694/11 "2008-05-12T20:10:42Z")
What type of plugs did you get, and did you check the gap on them? The more boost you run the shorter you need to gap it. I believe the plugs you get from crappy tire come with a 1mm+ gap and for SR20 I believe they need to be gapped to 0.7mm. ---
**Author:** ![ymaslin](https://avatars.discourse-cdn.com/v4/letter/y/2acd7d/32.png) [@ymaslin](https://forums.speedlife.net/u/ymaslin)\ **Post date:** [May 13, 2008, 12:10am UTC](https://forums.speedlife.net/t/misfireing/111694/12 "2008-05-13T00:10:25Z")
No I got my plugs from Pacific Mall some Iridium plugs. Not sure what they are called I’ll check tomorrow for the exact name but I’m only running 8 pounds of boost. By the way anyone know where i can get a MAF for a good price for my SR engine??? ---
**Author:** ![Gongster](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gongster/32/5615_2.png) [@Gongster](https://forums.speedlife.net/u/Gongster)\ **Post date:** [May 13, 2008, 8:03am UTC](https://forums.speedlife.net/t/misfireing/111694/13 "2008-05-13T08:03:38Z")
SOHC KA MAF will work with SR. They are cheap at the scrapyard.