REALLY rough idle - Kia Forum
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#1 (permalink) Old 05-13-2008, 09:16 AM
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Default REALLY rough idle

Ok Ive had to replace alot of things on this car... Now that I seem to have everything worked out its sill idling REALLY rough and popping out the intake. it was idling really high but I found that the iac and maf connectors were on backwords... ANYWAY I have new plugs, wires, coils, iac, maf and a fuel filter... Im lost as to what else it could be.

Last edited by mark458; 05-13-2008 at 09:32 AM.
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#2 (permalink) Old 05-13-2008, 09:38 AM
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I would double check the valve timing - maybe the timing belt has jumped a tooth or two.

What plugs and plug gap are you using?
Make sure the gap is 0.03" (0.75mm).

For service info register (free) with KiaTechInfo and click on 'Shop' on the left, and for elect schematics click on 'ETM'.

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#3 (permalink) Old 05-13-2008, 11:24 AM
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I have no way of checking the timing. The car drives just fine. As long as your moving theres no problem but sitting at idle it sounds horid.
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#4 (permalink) Old 05-13-2008, 11:37 AM
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Quote:
Originally Posted by mark458 View Post
I have no way of checking the timing. The car drives just fine. As long as your moving theres no problem but sitting at idle it sounds horid.
The valve timing can be checked by removing the top cambelt cover, but it sounds like this may not be your problem if you say it runs well, but just not idle.

Could be a vacuum leak on the inlet manifold, or the EGR valve leaking, if as you say the IAC/ISC is new.

For service info register (free) with KiaTechInfo and click on 'Shop' on the left, and for elect schematics click on 'ETM'.

Quality and not quantity counts.

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#5 (permalink) Old 05-13-2008, 02:45 PM
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Ok here are the error codes Im getting
p0301
p0303
p0300
p0170
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#6 (permalink) Old 05-13-2008, 04:29 PM
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Default Codes

P0170 Fuel Trim Malfunction - Bank 1.
P0171 System too Lean - Bank 1.
P0172 System too Rich - Bank 1.
P0261 Injector Circuit Low - Cyl. 1.
P0262 Injector Circuit High - Cyl. 1.
P0264 Injector Circuit Low - Cyl. 2.
P0265 Injector Circuit High - Cyl. 2.
P0267 Injector Circuit Low - Cyl. 3.
P0268 Injector Circuit High - Cyl. 3.
P0270 Injector Circuit Low - Cyl. 4.
P0271 Injector Circuit High - Cyl. 4.
P0300 Multiple/Random Misfire detected.
P0301 Misfire detected - Cyls. 1-4.
P0302 Misfire detected - Cyls. 1-4.
P0303 Misfire detected - Cyls. 1-4.
P0304 Misfire detected - Cyls. 1-4.

check your plugs and plug gaps clear codes to see if P0170 comes back
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#7 (permalink) Old 05-13-2008, 05:32 PM
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Found number 1 and 3 to have bad o-rings went to every parts store in the area only to find the kia has made it to where you have to buy the o-rings from them only! A 25 cent o-ring is $4.50!!! Kia is a bunch of con-artists!
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#8 (permalink) Old 05-13-2008, 07:03 PM
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What plugs are you using and what gap?

Best use the original NGK's and make sure they are gapped at 0.03" (0.75mm)

For service info register (free) with KiaTechInfo and click on 'Shop' on the left, and for elect schematics click on 'ETM'.

Quality and not quantity counts.

Sig image is 500X100 at 11.7 kb
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#9 (permalink) Old 05-13-2008, 07:38 PM
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Betcha it's the plugs and plug gap. Gap at .028 to .032.
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#10 (permalink) Old 05-13-2008, 10:11 PM
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betcha its got a few bent valves!

Matt

MT Engineering

Go Fast Rio Goodies
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