daniel mason
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| posted on 28/3/12 at 08:07 PM |
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any engine experts? fault finding? yet more expensive woes!
right, got my car back the other week after struggling to get emissions sorted at rolling road/engine tuners and took it back to where i got my ecu
fitted and wired for emissions checks and further mapping. finally think ive got the emissions sorted now and its running much better at idle with ecu
controlling lambda.
when we tried to do a few power runs it seems to have developed a serious mis-fire at about 6250 rpm and power just dies off. only making 184 bhp.
every time he tried to alter ignition advance/retard (not sure which) to increase power the mis-fire continued. the only way it would rev out
comfortably,and trouble free was when it was making low power at 184 bhp.
he thought it was a coil pack breaking down as he lessened the plug gaps to about 0.8mm from 1.1 and said i should buy some more and bring the car
back,(2 hour drive). but they are really expensinve.
i then rang original place and asked for advice before i buy something i may not need and he said he doesnt think it will be coil packs and more
likely a wiring fault somewhere!
any ideas what i should be looking for? cheers
engine;
2003 honda s2000
ecu;
dta s60 pro
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tilly819
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| posted on 28/3/12 at 08:27 PM |
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Im afraid i am not going to be much use as regards your fault, but i am very curious why you are using a stand alone ecu and not the standard s2000
one?
hope you get it sorted
tilly
F20C Haynes roadster 440 BHP/Tonne www.youtube.com/handmadeextreme
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daviep
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| posted on 28/3/12 at 08:31 PM |
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There appears to be a big part of the story missing.............what was changed to sort emissions?
Is it definately an electrical misfire?
Davie
“A truly great library contains something in it to offend everyone.”
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daniel mason
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| posted on 28/3/12 at 08:39 PM |
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i went with dta s60 on the recommendations of others mainly and i got a quote for wiring my standard ecu to my kit car of £1200 so i bought the dta
and got it wired for less than that then sold the ecu.
as for emissions im not sure on what was changed as i wasnt with the car originally when emissions were set. but we got the ecu lambda output working
and some more low down mapping done.idling now at 14.7 afr and seems spot on
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tilly819
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| posted on 28/3/12 at 08:42 PM |
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£1200 bloody hell,
took me about 3 evenings to chop the loom down and figure out what all the wires do for mine then a weekend to wire them in, wish i had known when you
were doing it and id have given you a hand.
tilly
F20C Haynes roadster 440 BHP/Tonne www.youtube.com/handmadeextreme
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daniel mason
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| posted on 28/3/12 at 08:51 PM |
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with an s2000 engine? what dash did you use mate?
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daviep
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| posted on 28/3/12 at 08:52 PM |
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What were the gas readings when the misfiring?
Davie
“A truly great library contains something in it to offend everyone.”
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daniel mason
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| posted on 28/3/12 at 08:57 PM |
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not sure davie. am not a mechanic of any description and seem to have bitten off more than i can chew with such a difficult install. am just a guy who
loves cars.
im not even sure what to be looking for when fault finding? i was told damaged ecu connectorpins are usually the cause so id imagine checking the 4x
coil outputs.
the mapping was throwing up cam sensor fault codes on his pc on mis-fire!
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austin man
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| posted on 28/3/12 at 09:07 PM |
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My brother in law had a misfire that we spent an age on trying to identify, not an s2000 we checked all wiring changed the coil pack, changed all plug
leads etc etc. Then moved to the injectors fuel pump. eventually found the problem to be the size of the swirl pot built into the tank it was too
small and couldn't cope with har acceleration. New 1 litre swirlpot fitted problem solved.
Steve Keenan also had a problem with his S2000 , his tank wasn't vented adequately. Sometimes is the simple things you need to look at first
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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tilly819
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| posted on 28/3/12 at 09:08 PM |
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i was going to use the s2k dash but i used a koso rx1n in sted since it was already in the car from the bike engine that was there before it.
here is a thread i did in the haynes forum if you are interested
http://www.haynes.co.uk/forums/showthread.php?t=6867
cheers
tilly
F20C Haynes roadster 440 BHP/Tonne www.youtube.com/handmadeextreme
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beaver34
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| posted on 28/3/12 at 09:34 PM |
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What wiring have you used to the crank sensor? It needs to be shielded cable to stop interference
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daniel mason
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| posted on 28/3/12 at 09:41 PM |
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he wired a shielded cable to crank sensor. but that could be something to look at.
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perksy
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| posted on 28/3/12 at 10:12 PM |
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If you have the DTA software installed on a laptop you can check the operation of various sensors
and it even has an oscilloscope for checking the trace of the crank sensor
Worth getting it installed if you haven't already
Otherwise start with the basics first and double check all electrical connections
Check the plug at the ECU etc
Are you using an FIA type cutout switch ? Seen these cause misfires
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coyoteboy
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| posted on 29/3/12 at 12:06 AM |
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Sounds like a crank sensor pickup to me too, either vibration of the sensor or possibly a gap issue - I'd be getting a scope on that output.
PITA.
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MikeRJ
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| posted on 29/3/12 at 11:17 AM |
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Is it using the original Honda crank sensor and trigger wheel?
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daniel mason
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| posted on 29/3/12 at 11:56 AM |
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Can someone please explain what the crank sensor actually should be doing and how I go about fault finding, if it's not correct
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coyoteboy
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| posted on 29/3/12 at 05:45 PM |
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Hard to give you an actual detail without knowing if you're using the stock trigger and how you're using it. Also with the s2000 I suspect
it'll use cam sensors too which will need to be checked.
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daniel mason
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| posted on 29/3/12 at 06:11 PM |
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it must be stock as i just removed the engine and box from the donor s2000 to the mnr. it does have cam sensor also but im un sure how to check this
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