REALLY rough idle

mark458 · 05-13-2008, 09:16 AM

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.

ron1004 · 05-13-2008, 09:38 AM

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).

mark458 · 05-13-2008, 11:24 AM

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.

ron1004 · 05-13-2008, 11:37 AM

Quote:

Originally Posted by mark458

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.

mark458 · 05-13-2008, 02:45 PM

Ok here are the error codes Im getting
p0301
p0303
p0300
p0170

colb · 05-13-2008, 04:29 PM

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

mark458 · 05-13-2008, 05:32 PM

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!

ron1004 · 05-13-2008, 07:03 PM

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)

jcwit · 05-13-2008, 07:38 PM

Betcha it's the plugs and plug gap. Gap at .028 to .032.

sportage4x4 · 05-13-2008, 10:11 PM

betcha its got a few bent valves!