# 4th cylender will not fire **URL:** \ **Category:** SON240sx Automotive\ **Created:** [October 10, 2011, 6:44pm UTC](https://forums.speedlife.net/t/4th-cylender-will-not-fire/217340 "2011-10-10T18:44:45Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Stephen\_Pro](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/stephen_pro/32/5722_2.png) [@Stephen\_Pro](https://forums.speedlife.net/u/Stephen_Pro)\ **Post date:** [October 10, 2011, 6:44pm UTC](https://forums.speedlife.net/t/4th-cylender-will-not-fire/217340/1 "2011-10-10T18:44:45Z")
okay, so long story short… redtop, with new crank bearings “wiring specialties” harness 300xz ignition module the car will start and run/drive but only on 3 cylenders. completely gutless untill 4000rpm i did a compression test awhile ago dont remember the #'s but they were all pretty close (i’ll check again as soon as i find another tester) the cylender closest to the fire wall does not fire. it has spark and fuel. I fidled with the cas, trying to adjust the timing but nothing helped. ANY help would be greatly appreciated, Thanks Stephen aditional info- when I replaced the bearings i never touched the head, the head is completely origanal, never touched. When I put the timing chain back on i used this [http://www.frsport.com/How-To-Set-Crank-Angle-Sensor--CAS--Timing-on-the-SR20DET-Engine\_t\_25.html](http://www.frsport.com/How-To-Set-Crank-Angle-Sensor--CAS--Timing-on-the-SR20DET-Engine_t_25.html) and I have only driven it for testing purpose, although it is suppose to be my dd, and is currently insured… i would like it have it fixed asap. ---
**Author:** ![89\_coupe](https://avatars.discourse-cdn.com/v4/letter/8/e0b2c6/32.png) [@89\_coupe](https://forums.speedlife.net/u/89_coupe)\ **Post date:** [October 10, 2011, 8:55pm UTC](https://forums.speedlife.net/t/4th-cylender-will-not-fire/217340/2 "2011-10-10T20:55:41Z")
are you sure its a misfire? does it run fine other than being completely gutless till 4000rpm? could be a sensor issue ---
**Author:** ![Stephen\_Pro](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/stephen_pro/32/5722_2.png) [@Stephen\_Pro](https://forums.speedlife.net/u/Stephen_Pro)\ **Post date:** [October 10, 2011, 9:19pm UTC](https://forums.speedlife.net/t/4th-cylender-will-not-fire/217340/3 "2011-10-10T21:19:32Z")
it is a misfire. I pulled the plugg out and it was soaked in fuel. and all other plugs had went white tiped (running lean). the other 3 cylenders seem to run fine other than running lean (but that could just be me messing with the CAS), but it feels like they are pushing the 4th… at 1/4 throttle and WOT there is no difference is torque. idk if there is a sensor that does that… Thanks tho, keep the ideas flowing ---
**Author:** ![Stephen\_Pro](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/stephen_pro/32/5722_2.png) [@Stephen\_Pro](https://forums.speedlife.net/u/Stephen_Pro)\ **Post date:** [October 12, 2011, 1:03pm UTC](https://forums.speedlife.net/t/4th-cylender-will-not-fire/217340/4 "2011-10-12T13:03:47Z")
I found it. the timing was a tooth off, and was set up on as pictured in figure 1 or the “how to” link. they have since changed it. I did the timing months ago and went to BC for quite awhile. they have since updated the diagram link i went off. thanks son