Wet plugs
Turbo Mini Forums

After absolutely dousing my plugs in fuel they don't seem to be sparking very well. :$

Whats the best way of drying them out fully. Ive left them over night and even got a heat gun on them but they still don't seem great. Ive tried a known good (and dry) plug and its a good blue spark.

These plugs are brand new, so I can only assume its the fuel causing them to be soooo weak?

Any ideas?

Cheers
Matt

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1/4mile in 13.2sec @ 111 terminal on 15psi

I've always used my blowtorch, the kind that you use for soldering central heating piping together, throwaway propane/butane cylinder type thing.

Good hot flame, enough to free of many siezed bits on engines (as well as doing soldering of large copper pipe like it's meant for) but not so powerful that it can do any damage.

Only problem is the flame won't tend to go up inside the plug, for some reason it bounces back from closed ends so I tend to heat from the side.

Otherwise oven on max (if wifey / gf are out).

Schrödinger's cat - so which one am I ???

Cool, ive jut given them a roasting. Fingers crossed they will work a little better now!

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1/4mile in 13.2sec @ 111 terminal on 15psi

If these are NGK plugs then dont expect them to recover. i've found this.

Although, saying that i managed to foul all my plugs at york on easter monday, a quick session on the car heater (suggested by carl) threw them in and it started, but misfired a lot! i mean 2 cylinders.

Keep it running and they will clear. the engine proved to be the best place to dry them out.

Hmm they are NGK's!

Hopefully they'll survive, cheers for the heads up though, that could save me spending even more time pissing about with them!

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1/4mile in 13.2sec @ 111 terminal on 15psi

post excavation here

what causes plug wetting?

Yes i moved to the darkside

Instagram @jdm_brett

too much fuel!

what does your AFR say or better still logs.

it idles at 14.5-15 afr which is why ive asked its puzzling me i know it first did it when i was sat in traffic and now it often does it at idle,
im going to get some more plugs but would like to cure it first if i can

i havnt got any logs of it doing it but this is a bit of it at idle

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Edited by Brett on 26th Feb, 2012.

Yes i moved to the darkside

Instagram @jdm_brett

what plugs ( heat range) are in it? I think most people go too cold on plugs, Ive run 20 psi on 6's.

that said of you have an intermitant spark you could douse the plug with incoming mixture, or if the oil is too thick in the dash pot, do you get a breif rich spike when you give it throttle?

they are gen metro turbo ones i got from John i believe there equivalent to 7's
and no it goes lean briefly then the fuel comes in

Yes i moved to the darkside

Instagram @jdm_brett

actually thinking about it, its got a stronger spring in there thats all that changed i think ill have to put my spring back in there and see if it still does it

Yes i moved to the darkside

Instagram @jdm_brett

if it goes rich enough to wet the plug so it misfires you can end up with the AFR rading lean, tricky to spot sometimes.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Ive had plugs soaked then torched them with a MAPP gas torch and they still refused to spark.

If they get soaked, for sake of a few quid the only sensible route is just to bin them. It removes any chance of the non-start or poor running being down to plugs.

After of course sorting the reason for them being soaked in the first place.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Its not a new problem. When I worked in the motor trade many years ago, we never re-used any plugs that had been fouled in any way.Experience taught us that they never performed again as well as they should.

We also found that sandblasting them ruined them. In the sixties it used to be routine to sandblast and re-gap the plugs at every service, but after about 1970 the plugs seemed to dislike this -dont know why.

I always bin wet plugs. Just not worth the messing. By reusing them all you do is introduce uncertainty in their performance for the remainder of their lifetime.

well ive got a set of new bpr5es in the tool box ill chuck them in to see what the fueling is doing at idle and if it idles ok ill set the fueling leaner and will go buy another set of plugs
come next week i can have it out on the road and start profiling a few needles

Yes i moved to the darkside

Instagram @jdm_brett

thats on the 7 port. i agree with te binning the wetted plugs, Ive found they arent the same after.

probably better for me to go a grade colder then as i would have thought the ally head would aid cooling some what

Yes i moved to the darkside

Instagram @jdm_brett

Brett a cooler plug would be 7s

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

Yeah but i just happen to have some 5es lol if thats what you mean

Yes i moved to the darkside

Instagram @jdm_brett

Yeah, I have always run bpr7es not had no problems

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

I should add thats 20 psi on ngk 6's and I wouldnt advise that everyone goes and whacks plugs that hot in and winds the boost up!!

its certainly wrth putting in the 5's and seeing what the idle and off boost drivability is like though