Maddening!
- ruckman101
- Lord God King Bwana
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Maddening!
my #4 cylinder doesn't seem to be firing at low rpms, but kicks in at higher rpms. I don't get it. The spark plug is nasty black and oily looking. Is it a compression thing? Seems like there's consistent compression across the four cylinders when I spin the pulley. I just don't get it.
neal
neal
The slipper has no teeth.
- hambone
- Post-Industrial Non-Secular Mennonite
- Location: Portland, Ore.
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Could be valve issues too. Do a compression test.
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http://pdxvolksfolks.blogspot.com
it balances on your head just like a mattress balances on a bottle of wine
your brand new leopard skin pillbox hat
- ruckman101
- Lord God King Bwana
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- Addicted!
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I had a cold weather issue with our bug some years ago, fouled plugs etc. I discovered the heat riser was not working. It wasn't plugged, however. The muffler had rusted and failed in such a way as to plug the outlets. what made it hard to diagnose was that the heat riser pipe would work sometimes, then not. I think loose parts in the muffler would lodge in the outlets, then work loose. If you have a non-stock exhaust, some are not drilled for the heat riser. Don't know if this helps, but it was one of the oddball problems that frustrated me for awhile. Good luck!
- Amskeptic
- IAC "Help Desk"
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Re: Maddening!
Nasty black oily is a *mechanical issue*ruckman101 wrote:my #4 cylinder doesn't seem to be firing at low rpms, but kicks in at higher rpms. I don't get it. The spark plug is nasty black and oily looking. Is it a compression thing? Seems like there's consistent compression across the four cylinders when I spin the pulley. I just don't get it.
You need to track down where this excessive oily is coming from.
You can have good compression and nasty black oily.
This normally suggests worn valve guides. A failed coked-up oil control ring can dump plenty o' oil in the combustion chamber and still give you good compression.
Check your compression with a gauge after adjusting the valves and inspecting each valve for proper seating. Let's see what we got after that first step.
Cylinder misfires in just one cylinder that has a dry-though-possibly-sooty-or-gas-wet plug is a different thing. . . the above suggestions are useful, as is pulling the wire to your dead cylinder out of the distributor cap just 1/4" at idle to see if you can compel it to start firing. If you bought Bosch plugs recently for this engine, if they are the Made In India plugs, I have had annoying and unusual quality lapses, like leaks between the white cenramic and the metal shell.'
Colin
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
- RSorak 71Westy
- IAC Addict!
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Replace the plug as temp fix, if it fouls again, replace it with a hotter plug, until you fix the mechanical issues.
Take care,
Rick
Stock 1600 w/dual Solex 34's and header. mildly ported heads and EMPI elephant's feet. SVDA W/pertronix. 73 Thing has been sold. BTW I am a pro wrench have been fixing cars for living for over 30 yrs.
Rick
Stock 1600 w/dual Solex 34's and header. mildly ported heads and EMPI elephant's feet. SVDA W/pertronix. 73 Thing has been sold. BTW I am a pro wrench have been fixing cars for living for over 30 yrs.