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Cyl 4 spark plug wet 

 

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 Post subject: Cyl 4 spark plug wet
Posted: Sat Feb 19, 2011 4:34 pm 
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Hey guys,
- Engine running rough
- Pull plug 4 : wet (rest of plugs almost white)
- Test plug out of cylinder : lots of spark
- Compression of Cyl 4 : 200

Could this be a head or a burnt valve issue?

 

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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sat Feb 19, 2011 5:30 pm 
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is it wet with fuel? oil? or water??

if it was a bad or burnt valve the compression would be s**t on that cyl...
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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sat Feb 19, 2011 5:42 pm 
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TROYMAN wrote:
is it wet with fuel? oil? or water??

if it was a bad or burnt valve the compression would be s**t on that cyl...

That was my thinking, pretty sure it's gas. No water in oil mind you it's a rebuilt bottom end/rebore so maybe it's not getting past.

Cracked head?

 

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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sun Feb 20, 2011 9:13 am 
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Have triple checked compression and it's very high.

Car seems to run smooth when started but under load or when warm the 4th cylinder doesn't seem to be firing. Plug very wet (seems like fuel but could be water).

Possible crack in head? Only shows when engine warm?

I'm lost here, have exhausted all options I can think of and next step is pulling head off, not a cheap exercise but if it's the only option...

Any ideas before I rip it off?

 

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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sun Feb 20, 2011 9:20 am 
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how about try the simplist thing first, it could be a dud plug or lead.... been know to happen.....

 

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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sun Feb 20, 2011 9:21 am 
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it sounds like it could have a crack in the head??
first up, how old are the leads and plugs?
a bad lead can be the cause of a cyl dropping under load or when warm..
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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sun Feb 20, 2011 9:22 am 
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AU99 wrote:
how about try the simplist thing first, it could be a dud plug or lead.... been know to happen.....

3 sets of leads and plugs already tried, should have mentioned above but yeh. Have even tried another engine loom and dizzy grasping at straws.

 

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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sun Feb 20, 2011 9:53 am 
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Check dizzy cap and rotor button....
dud injector???? change out number 4 injector and put it on number 3 perhaps and see if number 3 starts playing up.....

what are the compressions for all the other cylinders???

 

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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sun Feb 20, 2011 10:08 am 
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AU99 wrote:
Check dizzy cap and rotor button....
dud injector???? change out number 4 injector and put it on number 3 perhaps and see if number 3 starts playing up.....

what are the compressions for all the other cylinders???

All cyls are around 200, I have spare injectors and haven't tried them yet. Do you think an injector could be putting so much gas in the cylinder that it wouldn't fire?

I'm almost certain it's the head now =\ But would love to be wrong.

 

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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sun Feb 20, 2011 10:12 am 
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is it over pressurising the cooling system at all???
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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sun Feb 20, 2011 10:14 am 
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TROYMAN wrote:
is it over pressurising the cooling system at all???

Not that I've noticed, water level seems constant. How would I best test that?

 

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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sun Feb 20, 2011 1:20 pm 
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yes a dud injector can do that.....

 

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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sun Feb 20, 2011 1:22 pm 
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Swapped over a dizzy/leads along with injectors from a running car and it's running sweet now. Timing is out a bit but I don't have a light, will get one tomorrow and sort that.

Cheers all!!!

 

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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sun Feb 20, 2011 4:04 pm 
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so it was either dizzy, leads or an injector.....

do I get a prize for getting 3/3.... LOL

 

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 Post subject: Re: Cyl 4 spark plug wet
Posted: Sun Feb 20, 2011 4:35 pm 
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AU99 wrote:
so it was either dizzy, leads or an injector.....

do I get a prize for getting 3/3.... LOL

+10 Rep

lol :)

 

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