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Location:
Adelaide
Registered:
May 2002
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spark plugs melting/burning
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Tue, 09 December 2003 05:23
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just had the car serviced and replaced the same type of spark plugs that came out of it. with the short distance of driving home it was running on 3 cylinders. upon removing all 4 spark plugs it was obvisious that were run extremely hot. two were hot but okay, one was badly burnt and damaged and cyclinder 1 had completely melted.
the motor is a 12T but had 2T spark plugs in it as only 3 available australia wide. checked the fuel pressue and at no stage does it run lean. car runs hot so thought if it was running lean it may cause this problem. fixed the cars cooling and now runs much cooler.
anyway replaced all 4 spark plugs with the most heat resistance ones available. after 3 days of general driving (less then 100km) pulled all 4 out. 3 showed signs of running hot and the one in cylinder 2 had completely melted the electrode.
any ideas? i cant keep affording to replace spark plugs. some ford plugs have a very long reach or some type of race plugs. however these are a fix and not a resolution. anyone had similiar problems? any suggestions what it maybe?
thanks
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Location:
Brisbane
Registered:
May 2002
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Re: spark plugs melting/burning
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Tue, 09 December 2003 05:42
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1. Check your ignition timing - is it way advanced?
2. Check your A/F ratios using proper equipment if possible.
3. If all else fails, run colder plugs.
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Location:
Adelaide
Registered:
May 2002
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Re: spark plugs melting/burning
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Tue, 09 December 2003 08:02
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| Norbie wrote on Tue, 09 December 2003 16:12 |
1. Check your ignition timing - is it way advanced?
2. Check your A/F ratios using proper equipment if possible.
3. If all else fails, run colder plugs.
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1. is spot on as has been just serviced and rechecked since problem
2. have checked this already with proper equipment and no issues
3. its running the coldest plugs it can
its puzzled me. looks like ill have to pull the head off and see whats going on
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Location:
Brisbane
Registered:
October 2002
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Re: spark plugs melting/burning
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Tue, 09 December 2003 09:38
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sounds to be running EXTREMELY lean, what engine, u mean 2t, is it std.
Who checked your measurements, maybe get a 2nd opionio if u cant work it out,
does it run differently, i.e. under hard load/accel, or cruising
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Location:
Brisbane
Registered:
February 2003
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Re: spark plugs melting/burning
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Tue, 09 December 2003 10:28
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if you're sure IGN timing and fuel is OK, then maybe valve timing is off? tho if that's the case, it would run like shit and not let get hot.
if you've got an old gregories car manual, it should have pictures of variously stuffed plugs in it - match up to the relevant picture.
judging by the description, your:
timing is off
fuel delivery is off (checked for air leaks around manifold?)
wrong plugs
wrong leads
are you getting strong exhaust popping on deccel? a faster than usual take off? if so the nthe timing's out for starters...
charles.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: spark plugs melting/burning
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Tue, 09 December 2003 14:18
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what is the part number for the plugs?
what brand are you using?
what was the original part specced?
what is the NGK equivalent, or failing that, look up NGK spark plug codes and work out which it would be (by various size and other parameters...)
NGK heat range 10 is pretty bloody cold, and they do make them even colder if you need.....
if you have been using NGK's you are going UP numbers right?
failing all that, talk to www.ngkspark.com.au i'm sure they can work something out for you...
Cya, Stewart
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