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1974 450SEL Not running right

Started by nostat, 30 May 2013, 10:12 AM

nostat

 When I brought my 450 out of winter storage I took it for a spin and everything ran fine. The next day I was on my way to work and when it was warmed up it began to spit and back fire with black smoke out the exhaust. I put 10gal. of fresh gas in and a bottle of injector cleaner (sta-bil was added before storage). I took it out for a spin and after it warmed up  it began to spit and backfire again but after about a mile it started running fine. I took it on a few short errands and everything worked fine but today on my way to work it it started up again. I can't wait till its time to go home and see which 450 I
get. Any ideas as to what is going on would be helpful. Thanks

oversize

1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P

nostat


marku

450SE silver green/bamboo velour/green vinyl roof

oversize

Have you replaced anything yet?  I'd look at plugs first.  How old is the fuel?  Today it only lasts about 3 months before it goes off
1979 6.9 #5541 (Red Bull)
1978 6.9 #4248 (Skye)
1979 6.9 #3686 (Moby Dick)
1978 6.9 #1776 (Dora)
1977 450SEL #7010 white -P
1975 450SEL #8414 gold -P

Nutz

Yeah, start with ignition. Lots of fuel is not being ignited.