Strange problem with spark plugs/engine
Turbo Mini Forums

Hi all Iam having a strange problem with my motor It runs good on champion n9yc after fouling problems with ngk bp7es & bp6es but here's were the strange bit comes in the plugs get worse from cylinder 1-4 ie 1 looking purfect light brown deposit
2 looking darker slightly rich may be
3 looking black definitely to much fuel
4 actually wet & black still runs fine with the new plugs ngk would of had it by now but can't understand how they can get worse as they go along the line any ideas? Iam running the aldon amethyst system on it leads are good I've even swapped lead 1with4 in case a daft lead fault but no still the same help!! Thanks Scott

if your wetting ngk bpr6es you are stupidly rich

Yes i moved to the darkside

Instagram @jdm_brett

Just on 1 cylinder tho #4 #1 is fine that's me strange problem plugs get worse from 1-4

What set up are you running?

Swop the plugs around see if it changes

Swopped plugs & leads round still the same

the cylinder in question is burning oil, (weak or stuck oil controll rings) the fouling and wetting is oil not fuel. just a thought?

EDIT tappet clerances holding the valves a little open?

Edited by evolotion on 28th Apr, 2015.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

It's got total seal rings the heads just had all the valve seats recut new stem seals all guides are good & the plugs get worse from cylinder 1-4 there's not just 1 cylinder with a problem just 4 is the worst

Like i say just a thought, I had a 1380 that was doing similar, used to have to clean the plugs every few days and it was weak oil controll rings. one cylinder would always foul, with the others not too far behind.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Yes I would agree with mr evolotion, Scott the total seal rings are IMO not any way as good as a rebore and new omegas,

Your ignition timing could compound the above if retarded too much from optimal