my 87 needs help

johnio69 · Aug 10, 2009

Guys, I have an 87 with problems. It was idleing eraticaly and i took it to a mech. He says # 4 has a miss. It has plenty of compression, is getting fire, and has feul on the plug. He put in a new plug and advanced the timing witch was seriously retarted. When you give it gas the miss stops but idle is a problem. It gets worse. It will idle for about an hour of riding, then they idle goes off the charts. It wont idle down below about 2000 rpms. The throttle cable is fine and the carb appears to be closing all the way but it still wont idle down. When it starts this, it burns mad gas. I need somewhere to start here. The mechanics around here just start replacing stuff till they get it. I need someone who can really diagnose the problem. help

schmoo · Aug 10, 2009

sounds like a bad vacuum leak.
if you can't see it, you may be
able to find it with an unlit
propane torch.

johnio69 · Aug 10, 2009

the mech repaired all the vacume leaks as well

johnio69 · Aug 10, 2009

is there anyway, i can put some kind of after market carb and intake on that doesn't rely on all the emissions crap. i'll eliminate it all

olranger · Aug 11, 2009

yeah going to say vacuum leak

johnio69 · Aug 11, 2009

How would i go about finding it with an unlit torch

Mark_88 · Aug 11, 2009

johnio69 said:
How would i go about finding it with an unlit torch

Not a good idea if you're not familiar with torches...but it will cause the engine to rev up when the propane is sucked into the engine...

You might try smoke...like a cigarette...and watch where the smoke goes...but that can be difficult with the fan blowing the air around..a squirter bottle with water in it also works...when the engine sucks in water, it should rev up a bit just like propane...

Did you replace the wire on #4 cylinder? I found one wire out a set had a break in it and caused a similar situation...replacing the wire fixed it...

olranger · Aug 12, 2009

get a can of carb cleaner or throttle body cleaner and start spraying hoses, it will rev up and smooth out if rough at idle, this works great.

my 87 needs help

johnio69

10+ Year Member

schmoo

15+ Year Member

johnio69

10+ Year Member

johnio69

10+ Year Member

olranger

15+ Year Member

johnio69

10+ Year Member

Mark_88

15+ Year Member

olranger

15+ Year Member

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