Miss @ Idle

[33SOM]

Hi all,

My car has slowly developed a problem. Its been missing @ idle and is slowly getting worse.

Things ive ruled out are the normail coilpacks, plugs, inj etc as its only when its idling it misses.

Any help appreciated!!

[33SOM]

Didnt think this would be too hard to answer..

[paulr33]

check base timing ?

[paulr33]

[33SOM]

Thanks paul. I will look into this. Could explain why the car drives like a slug.

[33SOM]

The car is actually a jzx100 chaser. When I picked it up it still had jap spec fuel. I filled it up with 98ron and now im home (the sticks) I have to use 95ron.

Its gotten worse as the fuel got worse.

Could this be a problem?

[Guilt-Toy]

coilpacks can cause this, how did you test them ? did you try a different set thats working?

[33SOM]

I just assumed it would miss above idle if it was the coil packs.

[l0WRB]

dave when i picked my car up from compliance it was set at 0 degrees base timing

they mite do this because of the high ron fuel over in jap and then wen some young dickhead hopes in the skyline puts in unleaded thrashes it and it doesnt detonate lol

15 degrees advanced ftw lol hmmm i rkn check timing first aye

[33SOM]

Oh ok. I will look into it.

Thanks juz

[Guilt-Toy]

i had coilpacks in my car that would miss on idle and on very light cruise but they made 363rwkw without missing.

Coil packs can fail on any part of engine operation

[33SOM]

Hmm I dont know anyone with a chaser. jzx100s only have 3 coil packs but its $700+ for oem replacments!

[l0WRB]

what gap are your plugs dave?

i remember when my stock coilpacks were stuffed, so i gapped mine down to around .6 to stop the miss fire on boost

i noticed with the really small gap on idle it would sit there miss firing its ass off, but drove fine under load not miss firing

i then tried another set i had there which were 1.1 gap and it stoped the miss on idle but yeh spark would blow out from crappy coils lol

[DSR]

Cracked Spark Plug

[33SOM]

New plugs gapped @ .8mm

I leaning towards timing... Just need to get a timing light..

[delljit]

how do you check and adjust base timing?

[paulr33]

oh sorry dude - i assumed 33 gtst - my bad

daniel you do it with a timing light