Long story short, I have an mx5 mk1 1998 engine in a kit car, its using a megasquirts ECU which is configured to a default map for the engine running itbs. When I first ran it it sounded a little bit lumpy, and after 3 minutes or so my new stainless exhaust manifold had been stained a purpley brown from the heat, all except the runner for cylinder #2. I borrowed a timing light and the light would occasionally miss a flash every so often when testing that cylinder, all others worked fine. I've replaced ht leads and plugs, no change. If it was a coilpack issue, wouldn't two cylinders be misfiring as doesn't one coilpack do 2 cylinders? A friend wondered if cylinder #2 was actually running normally (the gun is a bit temperamental) and all the other cylinders are out of time and igniting late, resulting in much higher temperatures than expected? (They get really got, really quick, while cylinder 2 runner is cooler than the others, its still hot to the touch)
I suppose my question is, could this be a coilpack issue? Or does it sound more like a timing issue?
Simultaneously, my idle is reading rather high, cold start climbs to approx 1900rpm, and I can't get it down, the itbs are on their lowest idle adjustment and theres no vacuum leaks. Again, my friend wondered if this was the ECU reading engine speed wrong, as it doesn't sound like its turning over that quick. Is it possible that the ECU is counting the wasted sparks too and reading twice as high?
Any help appreciated, sorry for the wall of text!!
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Greetings and welcome to menders, this site was built for every owner that might need her to help keep those bills low and also keep them on the road where they belong, she is run by very passionate enthusiasts owners for passionate enthusiastic owners, see her like a on line garage, there is a lot of tech stuff hopefully explained for everyone to use, if there is something you cannot get your head around, or you feel that there is a strong walk through guide missing that needs creating by one of us or from yourselves, please let us know, we are also on false book and youtube, which as short tech vids to help, and again if you feel there is a vid that would help please get it touch.
the menders is free, but like everything there is a cost to run things and bills( we are just happy its not a heating cost), so if we have saved you hundreds, please throw a small donation in the pot so we can keep on going to carry on helping others in the same way .
*** we are currently looking for a sponsor for this year, so if you have the passion and can see this sites worth to everyone , please get in touch and step forward to help***
And thank heavens that we are now on the way back up the brighter ,warmer longer days, "come on summer", and lets see those project builds.
M-m
Strange misfire issue
Re: Strange misfire issue
Sorry I 'm unable to answer your question
Many of the Mazdamenders are at Blyton helping keep fellow owners on track, They are buried in the dark cave away from their phones. Unfortunately this means answers maybe a bit slow this weekend. I apologise for this, please stick with us, normal service will resume asap
Many of the Mazdamenders are at Blyton helping keep fellow owners on track, They are buried in the dark cave away from their phones. Unfortunately this means answers maybe a bit slow this weekend. I apologise for this, please stick with us, normal service will resume asap
Liz
MK1 J2Ltd
MK1 J2Ltd
Re: Strange misfire issue
Still sounds like a coil pack issue to me. Timing is set for all cylinders together so its impossible for it to be different for individual cylinders. If #2 isn't getting as hot as quick that suggests problem with that cylinder. They should all get very hot very quick. While the coil pack is 2 coils each firing 2 plugs, there might be a problem in the pack where it directs the charge to one of the plugs.
Lazza
2001 Mk2.5 MX5 1.8 Sport
Hard Dog Deuce
GAZ Gold Pro
Mk3 seats
17” OZ Racing Superturissmo wheels (for the toad)
15” Rota Circuit 10 wheels (for track use)
2001 Mk2.5 MX5 1.8 Sport
Hard Dog Deuce
GAZ Gold Pro
Mk3 seats
17” OZ Racing Superturissmo wheels (for the toad)
15” Rota Circuit 10 wheels (for track use)
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Re: Strange misfire issue
Have you checked for any furring up in the coil pack sockets?
M-m
M-m
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This post is a natural product made from recycled electrons. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects, the articles/answers/comments are provided for information purposes and they are not intended to substitute informed professional advice, I or mazdamenders.net cannot personally be hold responsible for any damage occurred from following this procedure or any injuries from it. Proceed at your own risk.
Mk 1 Eunos 93 black V.S II 1.8 ,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 .
Mk 1 Eunos 90 1.6 soul red ..f/ build
MK 2.1/4 Blue V.S Roadster 1.8 99 ..
MK1 1.8 ,white import.. (Ashleighs)
MK1 1.6 yellow J ltd import.f/build
MK 1 1.8 black Tokyo Ltd..f/build
http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/
- nedski
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Re: Strange misfire issue
Wayne had one only this weekend all green and furry in the coil pack socket.
After that try a basic compression test.
After that try a basic compression test.
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Garage Owner, Lincolshire
Helper to the Scunny track day crew and North Linc's Track Day Club.
www.stokesofkelsey.co.uk
Garage Owner, Lincolshire
Helper to the Scunny track day crew and North Linc's Track Day Club.
www.stokesofkelsey.co.uk
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