franky
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| posted on 30/1/11 at 03:41 PM |
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Lumpy idle...
I've got a real head scratch on here, my car did idle perfectly smooth however recently its got bumpy. It sounds like its missing but its
not
I've checked:
Plugs
coil packs
ecu's
TPS
MAF
No known airleaks as i've check all of the various hoses.
ICV cleaned and changed(it was clean anyway).
I've got a diagnostic port on the car but its not showing any faults at all.
Any ideas?
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bi22le
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| posted on 30/1/11 at 03:43 PM |
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If its been a long build what about fuel quality?
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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franky
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| posted on 30/1/11 at 04:04 PM |
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I've only ever put super unleaded in and only 5 ltrs at a time and its had a fair few top ups, I'm sure its not fuel related. I've
got perfect fuel pressure too.
I guess these things are meant to test us!
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austin man
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| posted on 30/1/11 at 04:10 PM |
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dirt on the crank sensor can cause a missfire due to inconsistent readings, a long shot but has affected 2 cars I have had in the past
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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big_wasa
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| posted on 30/1/11 at 05:04 PM |
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Wet plugs ?
I ran my engine mega rich after playing with a Dta ecu. The plugs never recovered.
Other than that I wold look for air leaks.
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omega 24 v6
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| posted on 30/1/11 at 05:35 PM |
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Single or multiple throttle bodies???
If multiple then balance them to make sure it's not that.
If it looks wrong it probably is wrong.
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speedyxjs
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| posted on 30/1/11 at 06:32 PM |
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Mine did that and it turned out to be the MAF needed earthing.
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franky
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| posted on 30/1/11 at 06:42 PM |
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multiple throttle bodies, all perfectly matched.
I've just ran the car for 15 minutes and its got about 80% better with the new MAF fitted(I killed the old one during testing/cleaning), Its
showing zero fault codes still.
A compression test shows 245psi on all 6 cylinders, plugs are a perfect in all respects on removal. I'll check the crank sensor. Also
i'll get some easy start to spray around all the hoses to see if it raises the revs at all.
Since the new maf RPM drift is 770-810rpm on idle.
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