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21-03-2017, 11:22 AM
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#1 | ||
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Starter Motor
Join Date: Nov 2014
Posts: 7
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Hey guys I have an au2 ute with 222000kms on it. It has a slight miss or surge under load about the 3G mark. I have done plugs, leads, coil pack, crank angle, cam position, O2, fuel reg, knock sensor, traced all the wiring resealed all gasket surfaces & plenums, ran bottles of injector cleaner though it, fuel filters, and blown back through the lines. The issue will go away for while after i do something to it then it comes back maybe a few weeks sometimes a day later. Just wanting to know if i have missed something or what I should do next
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21-03-2017, 12:33 PM
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#2 | ||
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FF.Com.Au Hardcore
Join Date: Aug 2009
Posts: 2,288
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A misfire is generally associated with ignition or fuel, if everything thing else is in a serviceable condition.
You've pretty well covered the ignition system. I can see you've been using injector cleaner. How long since the injectors were removed, cleaned & had the flowrates/spray patterns tested? What about the fuel pump? Checked for fault codes? |
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21-03-2017, 01:25 PM
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#3 | ||
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Starter Motor
Join Date: Nov 2014
Posts: 7
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I haven't had the injectors pulled out and cleaned/ tested. I would have thought that a bad spray or leaking injectors would show at idle/low revs. Fuel pump was done about 8 months ago due to the top cracking out.
I've had a a look at the codes a while back but there wasn't anything there |
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21-03-2017, 02:24 PM
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FF.Com.Au Hardcore
Join Date: Sep 2005
Posts: 1,380
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Were the new coil packs & leads reputable brands ??
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21-03-2017, 05:32 PM
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#5 | ||
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Starter Motor
Join Date: Nov 2014
Posts: 7
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Bosch coil pack and NGK leads & iridium plugs
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Engine miss/surge under load
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