Hi,
My engine is misfiring under load. Seems to idle ok, but as soon as I attempt to drive the miss appears. This is a new problem, which just appeared the other day when I was driving and required a tow home. I've since thrown a new set of plugs at it, but the problem still persists. I am running a Microsquirt module that handles the EDIS-4 ignition system, however the car is carburettored.
The fault could be fuel/air related, but I am not discounting the ignition system just yet as experience has shown me that it can be difficult to diagnose these things. So I just thought I'd post my log file and msq and hopefully, if there are any abnormalities, it will be apparent to someone looking at the log file with more experience working with these.
Thanks
engine misfiring under load
Moderators: jsmcortina, muythaibxr
-
- Helpful MS/Extra'er
- Posts: 60
- Joined: Sat Oct 22, 2011 3:13 pm
engine misfiring under load
- Attachments
-
- 2018-01-18-504-turbo.msq
- (114.55 KiB) Downloaded 21 times
-
- 2018-01-16_12.58.37-missing-under-load-2018.msl
- (968.57 KiB) Downloaded 19 times
-
- Super MS/Extra'er
- Posts: 17507
- Joined: Thu Apr 16, 2009 8:08 pm
Re: engine misfiring under load
Can you make a new log, and hit the space bar when the miss appears? Nothing really blatant showed up in that log.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
Re: engine misfiring under load
Attempt to drive or just increase the RPM's?Seems to idle ok, but as soon as I attempt to drive the miss appears.
Lots of things to look at besides plugs.
Firing order and plug wire condition (distributorless setup?)
Battery voltage
Alternator noise
battery cable condition
crank trigger condition & wiring
Head gasket (crossfiring)
Fuel pressure under load
Correctly identify your MS ecu here
Read the Do's and Don'ts to avoid the common pitfalls before starting your install or asking for help
Use only these manuals other manuals may cause brain damage or worse.
Read the Do's and Don'ts to avoid the common pitfalls before starting your install or asking for help
Use only these manuals other manuals may cause brain damage or worse.
-
- Super MS/Extra'er
- Posts: 1275
- Joined: Thu Apr 07, 2005 11:23 pm
- Location: Sydney, Australia
- Contact:
Re: engine misfiring under load
Run it in the dark (really dark) and have a look around the engine for a light show. I've had bad ignition leads play havoc with the ECU.
Re: engine misfiring under load
Check your fuel pump and tank connections where air may be leaking IN under load.