daniel mason
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| posted on 22/4/12 at 07:20 PM |
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Can a leaking manifold cause high rpm missfire?
As above really. Could a slight air leak in manifold cause it to run fine at idle and fast idle but a missfire in the upper rev range?
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britishtrident
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| posted on 22/4/12 at 07:28 PM |
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If the misfire is worse under load check the ignition, plugs, plug leads & coil packs also LT ignition wiring.
[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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Mark Allanson
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| posted on 22/4/12 at 07:49 PM |
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Yes it can, especially with an injection set up, sensors get the wrong signals and the ECU does the wrong thing.
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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PAUL FISHER
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| posted on 22/4/12 at 08:16 PM |
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Having run a lot of jap cars over the years, a few developed under load high rev misfires, always turned out out to be coil packs, I changed the coil
packs, problem solved, I may have been lucky, but with a misfire I would first start with plugs, leads, coil packs in that order, it might also be
worth checking fuel pressure, pump and regulator and injectors.
[Edited on 19/05/04 by PAUL FISHER]
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austin man
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| posted on 22/4/12 at 10:30 PM |
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Have you sprayed wd 40 around the inlet this will generally cause the revs to rise if a leak is detected you can has a colours gas / smoke sprayed
around the induction side if a leak is present it will show from the exhaust exit.
Brother in laws 200bhp Zetec developed a misfire under load did every thing to it plugs, leads coil pack injectors rewires ne pressure regulator, pump
it turned out to be his swirl pot which was too small He has since fitted a Bigger swirl pot / seperate item and a low pressure pump in line problem
solved.
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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daniel mason
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| posted on 23/4/12 at 09:22 AM |
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I'm just curious as the co emmissions are also slightly out at 0.29 at fast idle so thinking this is causing the multiple faults?
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PAUL FISHER
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| posted on 23/4/12 at 11:47 AM |
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Is it your inlet manifold thats leaking air? if it is, then fix it first, then you have ruled it out, but that could cause high CO, at fast idle, the
extra air could be telling the ecu to feed more fuel, but it could also be, a faulty lambda, cat not getting hot enough, a faulty fuel injector, this
could also be your high rpm misfire
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daniel mason
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| posted on 23/4/12 at 04:47 PM |
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problem is the s2000 coilpacks are the built in ones and cost a fortune!
its not the inlet manifoild its the exhaust manifold i think
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