carse
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| posted on 29/11/11 at 03:58 PM |
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Hesitation/misfire/fuel starvation - need a bit of help
Hi all,
Did a track day at Oulton park on the 19th of Nov (the other Saturday). Had a really good session driving it hard then came in to swap drivers so the
car was particularly warm, it then sat in the queue to go back out on track and preceded to over heat (I'm pretty sure now the radiator fan
mustn't be working, most probably a lack of power to the fan or a sticky thermostat).
I let it cool down again and sorted the problem, topped it up with water etc and re-bled the cooling system. But towards the end of the day (maybe an
hour or so after the over heat) the engine seemed to develop a little cough/hesitation on full throttle in the upper rev range, say 7-8,000rpm+.
It feels a little like fuel starvation as it's not like a brick wall thing, it will rev out beyond it to the limiter, just with reduced power
and definitely not as quickly as when it's on fine form. I'm almost certain it isn't ignition related as it's not a big
misfire like a knackered plug or something, it just isn't 100% healthy.
So, to the point. I was wondering if any of you who are more qualified than me could shed any light? Is it a possibility in your opinion that the over
heat could have caused the problem I'm experiencing? Blown the head gasket? Or at worst, warped the head?
The engine is a 2004 (K4) Suzuki GSX R 1000 unit in an MK Indy R. It's had new plugs relatively recently so shouldn't think there's
a problem there. The only thing is when it over heated, it slightly pushed the coolant pipe off one of the T-pieces so was spraying water/coolant
around the engine bay. I would have thought that would have evaporated off fairly quickly due to the heat of the motor/exhaust and then going back out
again but could some water have got into an electrical connection somewhere and caused the gremlin?
I've tried to give as much detail as possible so hope it helps.
Any help very much appreciated.
Cheers,
Carse
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adithorp
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| posted on 29/11/11 at 04:31 PM |
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Shame there was no hesitation before posting in 3 different sections and thus pushing other peoples threads off the front page.
Can't comment on the hesitation but if you overheat at this time of year then you'll have major trouble in summer. get to the bottom of
that and you may find your other problem.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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carse
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| posted on 29/11/11 at 04:50 PM |
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Like I said, the car had had an extremely hard session then sat stationary running, hence the over heat. Has been fine on roads all summer.
"A witty saying proves nothing" - practice what you preach mate. Was only trying to get a bit of advice so thought I'd post it in
all relevant forums to my problem. I thought this was meant to be a community where you could ask away and get considered responses from like minded
people?
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deezee
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| posted on 29/11/11 at 05:10 PM |
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Maybe the overheat was caused by a head gasket problem, over pressurising your coolant system with compression bypass. This pushed off your hose?
Happened on an engine of mine! The fault is (through no fault of your own) vague. I'd start with a compression check, check the plugs, check
the coils, check you injectors, check the wiring, check your header tank for a head gasket problem. Its also worth fixing your cooling system if your
going to thrash it around a race track. Having no radiator or a dodgy thermostat is just asking for an expensive bill!
As for posting in 3 sections, I don't blame you for looking for advice, you've come to the right place. But throwing a few posts onto the
front page pushes other peoples posts off, who are also looking for help.
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Dusty
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| posted on 29/11/11 at 05:44 PM |
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Essentially you say the car has been fine all summer, fine for the first thrash round the track, then while sat in the queue it overheated and blew
off a hose, wetting the under bonnet area and electrics. You fixed that and the car was fine for another hour but then developed a slight missfire and
loss of top end power. So it's not even clear if the overheat was related to the problem. Sounds more like the stress of the trackday has caused
the problem. Could be almost anything, plug, coil, head gasket, fuel.
I have twice suffered with fuel pickup problems after trackdays, due to the violent sloshing in the tank churning up debris. I don't have an
envelope type filter on the tank end of the pickup pipe. Despite flushing my tank to clear the debris, some garages still deposit new gunge when I
fill up.
And yes it is a community and you can ask away but as we all see the posts on the front page you have asked the same people the same question three
times. Should I put this post on all three of your posts?
[Edited on 29/11/11 by Dusty]
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DixieTheKid
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| posted on 29/11/11 at 07:37 PM |
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quote:
Originally posted by adithorp
Shame there was no hesitation before posting in 3 different sections and thus pushing other peoples threads off the front page.
Can't comment on the hesitation but if you overheat at this time of year then you'll have major trouble in summer. get to the bottom of
that and you may find your other problem.
+1
COS IT'S Worth IT
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carse
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| posted on 30/11/11 at 09:46 AM |
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Apologies to all if I screwed things up on the front page. As you can see by my post count I'm still relatively new to posting. I was only
trying to get as much help as poss but realise I've messed things up for other users so sorry.
I do really appreciate everyones help and the wealth of knowledge that's on offer to tap into with the locostbuilders community.
I won't make the same mistake twice.
Hopefully there's no bad blood as I know I always enjoy chatting to guys who run seven-a-likes.
Cheers,
Carse
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Nick DV
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| posted on 30/11/11 at 02:28 PM |
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Carse,
You don't need to apologise, you didn't screw anything up and no one should feel there is 'bad blood'!! (Not a good way to
welcome someone looking for advice to the forum imho!!)
Good luck with the engine, and keep posting 
Cheers, Nick 
"The force will be with you, always!"
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