P38A spark plug colour

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kermit_rr

kermit_rr

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Right you lot. I pulled the plugs on bank 1 to check compression on #3. That was fine and about the same as when i last checked.
But, plug colours aren't right and i can't remember what they should be. I've been having a cold misfire on #3 which is what sparked this investigation.
Plug 3 is on the left, plugs 1 and 5 look like the one on the right, not pulled 7 yet.
This is after a long, normal drive at normal engine temp.
Plug 3 looks normal, the other 'white' one looks too hot? They are BPR6ES and not done huge miles
16428492884850.jpg
 
kermit_rr said:
Right you lot. I pulled the plugs on bank 1 to check compression on #3. That was fine and about the same as when i last checked.
But, plug colours aren't right and i can't remember what they should be. I've been having a cold misfire on #3 which is what sparked this investigation.
Plug 3 is on the left, plugs 1 and 5 look like the one on the right, not pulled 7 yet.
This is after a long, normal drive at normal engine temp.
Plug 3 looks normal, the other 'white' one looks too hot? They are BPR6ES and not done huge miles
View attachment 257364
Click to expand...
I would say the white one is running very lean, but with unleaded and LPG I'm not really sure. On my MR 2 running super, they look like the one on the left, maybe a tad lighter.
 
Datatek said:
I would say the white one is running very lean, but with unleaded and LPG I'm not really sure. On my MR 2 running super, they look like the one on the left, maybe a tad lighter.
Click to expand...
Not running on lpg at all at the moment while i sort through issues.
Just found an old plug i took out and that's similar to the white one but a bit worn.
The normal looking one could be related to the rich misfire in having then, ie it's always leaking and the others on the back are compensating to bring the o2 sensor value back... Hmm
 
kermit_rr said:
Not running on lpg at all at the moment while i sort through issues.
Just found an old plug i took out and that's similar to the white one but a bit worn.
The normal looking one could be related to the rich misfire in having then, ie it's always leaking and the others on the back are compensating to bring the o2 sensor value back... Hmm
Click to expand...
Too many sensors on the V8, I guess you could be right, one rich cylinder could cause the ECU to lean off the mixture to compensate but I really do not know.
 
Flossie said:
Bugger! I must have flung it/given it away, sorry:oops:.
Got a petrol compression tester but you have one of those.
I did have one of those little sparkplug sandblaster things too, got it around the time I got the colour tune but that's gone too.:rolleyes:
Same as the colour tune...no idea what I did with them..old age memory:(
Click to expand...
Welcome to the club Chris:D
 
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