hiwex
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| posted on 25/8/14 at 09:24 AM |
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Car stutters under load, revs freely otherwise
Hi All,
I have a set-up with an ST170 engine running GSXR750 ITB's and Megasquirt MS3X. I built the care car a few years ago and has been sprinting and
hill climbing just fine until recently, when it's started running rough. When I either try to accelerate from low revs or just accelerate hard
to move the VVT cam, it stutters almost as if it's misfiring, sometime also popping in the filter? I've checked the map and all looks OK,
so I'm struggling with a diagnosis. Any ideas?
Cheers
Mike
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mcerd1
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| posted on 25/8/14 at 09:47 AM |
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how are you controlling the VVT ?
(its been discussed to death before: http://www.locostbuilders.co.uk/viewthread.php?tid=165372 )
[Edited on 25/8/2014 by mcerd1]
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britishtrident
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| posted on 25/8/14 at 09:54 AM |
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Coil pack & plugs ?
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Slimy38
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| posted on 25/8/14 at 10:47 AM |
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quote:
Originally posted by britishtrident
Coil pack & plugs ?
Plugs would be my first thought as well, the stuttering under load is what my bike does when the plugs are reaching end of life. Interestingly when I
take them out there are no visible signs of wear, but new plugs stops the stuttering.
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ian locostzx9rc2
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| posted on 25/8/14 at 10:47 AM |
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Coil pack and leads and plugs first if they haven't been changed in a few years.
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Dingz
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| posted on 25/8/14 at 11:07 AM |
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fuel filter, or restriction somwhere?
Phoned the local ramblers club today, but the bloke who answered just
went on and on.
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hiwex
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| posted on 25/8/14 at 11:38 AM |
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Thanks all, I'll change the plugs and leads first then, then coil pack and then I'll look at the fuelling, I've got a gauge so
should be able to see the pressure.
Thanks a lot all for your suggestions.
Cheers
Mike
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hiwex
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| posted on 24/9/14 at 02:47 PM |
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Just to update you all and thank you for your help.
It was the coil pack, but I changed the plugs and leads too, found some rainwater around the plugs while at it too.
Problem fixed, raced the next day, came home with trophies!
Cheers all!
Mike
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prawnabie
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| posted on 24/9/14 at 05:44 PM |
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The rainwater may not be rainwater..... There are 1 or 2 core plugs in-between the plugs that are fairly common to leak coolant.
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hiwex
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| posted on 24/9/14 at 06:12 PM |
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Thanks, I did check that, all is oK. A Morgan has a louvred bonnet, it's a common problem.
I've got hold of some exhaust heat shield that I'll modify to cover the rocker cover.
I appreciate the thought though.
Cheers
Mike
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