S2KI Honda S2000 Forums

S2KI Honda S2000 Forums (https://www.s2ki.com/forums/)
-   S2000 Under The Hood (https://www.s2ki.com/forums/s2000-under-hood-22/)
-   -   Misfire on Cylinder #4 (https://www.s2ki.com/forums/s2000-under-hood-22/misfire-cylinder-4-a-1189919/)

cheddaboy 11-24-2018 09:45 PM

Misfire on Cylinder #4
 
So I've been having some issues with my motor for atleast 2 years now and still can't seem to figure out what's wrong.

Quick back story.

Swapped out my perfectly fine running F20 and swapped in a freshly built F24 motor. That motor overheated and the F20 was swapped back in. I now have completed the 2.4L motor and it's i It's currently in the car. I'm running the CNC Speedshop kit with Wiseco pistons and the head has just been refreshed with some ap2 goodies. Anyways, I've started the new motor and am getting a misfire on cylinder #4. This has happened when I swapped my my previous motor back in as well(F20).

Problem: 2 separate motors misfiring on cylinder #4 after tons of troubleshooting. Misfire is almost always present on or off throttle.

List of diagnosis:
- IAT sensor position
- Multiple TPS sensors
- MAP sensor
- fuel Injectors
- pigtails for the Injectors
- Brand new OEM engine harness
- Brand new OEM coil packs
- new spark plugs
- multiple tunes
- swapped known working coil packs
- leak down(f20c)

Things I'm going to check:
- Leak down
- compression test
- check ecu pins(ecu side)
- try a friend's Kpro unit
- send my computer back to hondata to be checked

If anyone has had this haopha to them let me know what it was please! Also, if there's something I might've overlooked, let me know

summitrider2012 11-25-2018 04:49 AM

So what exactly have you done to try and narrow it down?

cheddaboy 11-25-2018 02:38 PM


Originally Posted by summitrider2012 (Post 24536654)
So what exactly have you done to try and narrow it down?

List of diagnosis:
- IAT sensor position
- Multiple TPS sensors
- MAP sensor
- fuel Injectors
- pigtails for the Injectors
- Brand new OEM engine harness
- Brand new OEM coil packs
- new spark plugs
- multiple tunes
- swapped known working coil packs
- leak down(f20c)

noodels 11-25-2018 11:48 PM

Checked fuel rail fpr & fuel preassure

cheddaboy 11-26-2018 01:40 AM


Originally Posted by noodels (Post 24536948)
Checked fuel rail fpr & fuel preassure

Anyway to check that without a fuel pressure gauge? I'll add that to the list

summitrider2012 11-26-2018 03:28 AM


Originally Posted by cheddaboy (Post 24536813)
List of diagnosis:
- IAT sensor position
- Multiple TPS sensors
- MAP sensor
- fuel Injectors
- pigtails for the Injectors
- Brand new OEM engine harness
- Brand new OEM coil packs
- new spark plugs
- multiple tunes
- swapped known working coil packs
- leak down(f20c)


yes but but what exactly did you do? Like replace just the tps or the whole throttle body? Did you swap around the fuel injectors before you replaced them or just replace them? Did you check resistance from the pigtails you installed to the ecu/power? Stuff like that is what I was wondering.

cheddaboy 11-27-2018 01:44 PM

Ohh sorry about that lol

- swapped IAT sensor position from manifold to after cooler about 6" before tb
- tried 3-4 TPS sensors all calibrated(both OEM and aftermarket)
- tried 2 separate 3 bar MAP sensors and tested voltage at the connector
- swapped injectors back and forth between cylinders with 2 separate sets. Also trued hardwiring the to the harness.
- tried old and new pigtails for the Injectors
- Brand new OEM engine harness
- Brand new OEM coil packs(tried two used sets as well
- new spark plugs
- multiple tunes
- swapped known working coil packs(useda dummy sparkplug to see if the coil pack was working
- leak down(f20c)

Also tried 2 different tb's

when checking resistance at the ecu pigtails, what should it read?

noodels 11-27-2018 01:56 PM


Originally Posted by cheddaboy (Post 24536955)
Anyway to check that without a fuel pressure gauge? I'll add that to the list

Nope.

noodels 11-27-2018 02:08 PM

Suggest buy a kit for testing low and high preassure ,then can test for voltage values as needed

cheddaboy 11-28-2018 09:50 AM


Originally Posted by noodels (Post 24537663)
Suggest buy a kit for testing low and high preassure ,then can test for voltage values as needed

Low and high pressure in the cylinders?? Like a compression and leakdown test?


All times are GMT -8. The time now is 05:30 AM.


© 2019 MH Sub I, LLC dba Internet Brands