Rough idle When Warmed Up

[96FirebirdFormula]

it starts missing out at idle i got new plugs any ideals?

[BigDaddy04sho]

conections

check to see if u didnt cross the wires, and if they are properly gaped. not to mention the wires are making contact with the plugs

[96FirebirdFormula]

check to see if u didnt cross the wires, and if they are properly gaped. not to mention the wires are making contact with the plugs

i checked them all but it was bad idle before i put new plugs in

[BigDaddy04sho]

wires

did u change the wires too? might have a bad wire some where.... when it warms up does the missing go away? or is it always doing it.??

[96FirebirdFormula]

it only does it once it warms up think i need new plug wires had same plugs in it from factory when i bought it

[BigDaddy04sho]

wow

wow man.... i change my plugs and wires at least once a yr. not because i have to, but just to make sure im getting all that i can from it. i would get new wires if i were u. its up to u on what to get. I have MSD wires on my TA but ur lookin at 80-100 on wires. u could always just get the shop brand, and use those. alot cheaper and a good quick fix.

[Jeff_in_Atl]

Do you have the little metal shields on the spark plug boots? If so take them off and see if it still misses.

[96FirebirdFormula]

yeah there still on them

[MDMike]

Do you have the little metal shields on the spark plug boots? If so take them off and see if it still misses.

Can they really cause misfires or arcs?

[Jeff_in_Atl]

Oh yes. You can see them arcing in the dark. I don't quite understand why since they are not grounded to anything.

True story, I put a set of wires on my car. I took the metal shields off the stock wires and stuck them on the new wires. I cranked it up and it was obviously completely missing on at least 1 cylinder. My neighbor across the street builds major engines for a living heard it and came walking over. He asked what was going on and I told what I had done. He slid up under it and ripped the covers off and said try it now. Sure enough it fixed it. I was amazed. I've seen it several times on the board too.

[ConElite]

I guess I got Lucky, I got New plugs and Duralast Wires and Put the Sleeves and Car runs great. Interesting. But I would recommend changing the wires and installing them without the shields.

[MDMike]

shields go

Thanks, I guess I'll remove those things.
So the protection from engine bay heat is not worth the arcing and misfire, I understand...

[Injuneer]

But appears you are saying it idles fine when its cold, but only idles rough when it warms up?????

That can often be a problem with the O2 sensors, throwing the A/F ratio off when it goes into closed loop.

[Joe 1320]

Can they really cause misfires or arcs?

Heck yeah. So many times they work from the factory, as soon as you change plugs and wires the dang things cause arcs. I ditched them and used taylor firesleeves.

[MDMike]

thanks

Heck yeah. So many times they work from the factory, as soon as you change plugs and wires the dang things cause arcs.

Good take re OEM factory accessories that fail after servicing! Dont get me started on plastic parts for Alfas...

I'm going AC wires and NGK Tr55 copper plugs.