demonbarber33
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| posted on 25/5/18 at 08:11 PM |
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Zetec on bike carbs cant suss misfire
Hi im at a loss have misfire full throttle in 4 gear aprox 6.5k.
Changed coil leads plugs, fuel pump checked tank breather, thought was fuel but now maybe electrics.
DO edis units play up? Crank sensor? Lost now! Help!
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avagolen
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| posted on 25/5/18 at 09:15 PM |
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Fuel flow?
Does your fuel pump have enough flow rate to supply fuel at those revs and load?
The Answer for everything, but never the last word....
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snippy
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| posted on 25/5/18 at 09:31 PM |
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I had the same problem on mine a couple of years ago. Same set up, zetec on zx6r carbs. It wasn`t getting enough fuel at high revs causing it to
stutter badly. I was running a bike fuel pump and also a malpassi fuel regulator. I removed the fuel regulator which cured it.
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demonbarber33
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| posted on 25/5/18 at 09:46 PM |
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Got good fuel flow 1300ml per minute,Car used to rev to 7200 no problem
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johnemms
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| posted on 26/5/18 at 09:41 AM |
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Whats your AFR at WOT
Own chassis & Build - First time pass!!
"7's" aren't really "cars", they are 'experiences"
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Angel Acevedo
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| posted on 26/5/18 at 02:07 PM |
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Does it revs up to 7200??
Or gets to 6.5K only?
I can´t make what you have changed, Coil, leads and plugs?
Does it feels like a rev limiter?
Coil starting to fail may give that failure mode as well as valve float due to weakened spring?
HTH
Beware of what you wish.. for it may come true....
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demonbarber33
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| posted on 26/5/18 at 05:36 PM |
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I’ve changed all electrics 😳
Revs out in lower gears no problem,feels like limiter
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dan8400
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| posted on 26/5/18 at 05:55 PM |
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I had the same set up and , as mentioned, it was fuel trouble.
I changed all the things you changed chasing it.
Mine was down to crap in the carbs (blocked jet). Quick strip down and plenty of carb cleaner and it was right as rain.
Seems to be fuel trouble one way or another.
Good luck with the fix
Thanks
Dan
Hey - That's Journey!!!
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Ugg10
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| posted on 26/5/18 at 06:29 PM |
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Did you use shielded cable for the crank sensor and have earthed it. I had a similar problem but at lower revs with the engine stuttering but this was
on injection, it was interference with the crank sensor cable.
---------------------------------------------------------------
1968 Ford Anglia 105e, 1.7 Zetec SE, Mk2 Escort Workd Cup front end, 5 link rear
Build Blog - http://Anglia1968.weebly.com
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demonbarber33
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| posted on 27/5/18 at 02:17 PM |
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Only thing I’ve found is a bit of debris in one of the pilot jets, gonna check the needle valve seat filters to see if blocked up at all. Happy days!
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Schrodinger
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| posted on 27/5/18 at 04:25 PM |
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What ECU are you using for ignition?
Keith
Aviemore
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demonbarber33
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| posted on 27/5/18 at 06:07 PM |
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Megajolt but same problem running just on edis
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Schrodinger
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| posted on 27/5/18 at 07:07 PM |
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Are you sure it is not a soft cut out in the megajolt
Keith
Aviemore
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demonbarber33
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| posted on 27/5/18 at 09:10 PM |
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Yep set at 7500 rpm revs out in lower gears
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