48 loses power when running
Thread Starter
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Laughing Gas
Joined: Aug 2016
Posts: 852
Likes: 466
From: Albuquerque and Colorado
48 loses power when running
48 f1 226.
Dies when driving but immediately starts up and idles fine. If reved in the garage after a while it’ll act like it’s going to die and very occasionally there is a backfire, let off the throttle and it’s back to normal.
The following has been done.
Carb rebuilt by Cowboy John. Fuel tank cleaned, new lines. Electric fuel pump with clear filter temporarily installed. Wiper vacuum line blocked. Manifold heat valve seems to work properly.
Could it be the vacuum advance unit?
Nearing wits end on this one.
Thoughts?
Dies when driving but immediately starts up and idles fine. If reved in the garage after a while it’ll act like it’s going to die and very occasionally there is a backfire, let off the throttle and it’s back to normal.
The following has been done.
Carb rebuilt by Cowboy John. Fuel tank cleaned, new lines. Electric fuel pump with clear filter temporarily installed. Wiper vacuum line blocked. Manifold heat valve seems to work properly.
Could it be the vacuum advance unit?
Nearing wits end on this one.
Thoughts?
Fleet Owner
Joined: Jul 2004
Posts: 27,296
Likes: 1,059
From: NM
Sounds like ignition is the problem. The intermittent nature of it makes me suspect the coil or the wire under the breaker plate. Feel the coil when it dies, if it's hot then that is likely the problem.
Fleet Mechanic
Joined: Aug 2019
Posts: 1,360
Likes: 418
From: Monmouth County, NJ
Thats funny. I just replaced my distributor and that's what we found; an old, frayed, oily, loosely- taped -up wire under the breaker plate. Probably causing: intermittent problems of hard to start, back firing, conking out. Almost seemed like a fuel problem.
Thread Starter
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Laughing Gas
Joined: Aug 2016
Posts: 852
Likes: 466
From: Albuquerque and Colorado
Coil doesn’t feel hot but I may just replace it. I’ll check the wire
There is an old saying that I always pass on “90%of fuel problems are ignition related” I didnt follow my own advice, time to go to that side of the engine.
Thread Starter
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Laughing Gas
Joined: Aug 2016
Posts: 852
Likes: 466
From: Albuquerque and Colorado
Thanks. I may have a problem that I never throw anything out, but it’s come in handy.
More Turbo
Joined: Jan 2012
Posts: 714
Likes: 133
It could be a blocked exhaust? I had a truck that would run fine and then lose power and die. Immediate restart. A piece of rust would block the exhaust. When it died it dropped back down. It took me a while to figure it out.
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Tuned
Joined: Feb 2016
Posts: 359
Likes: 32
From: washington
i put a petronics dizzy in and a flamthrower coil. worked great ever sense. there is a sweet spot on the choke but easy to find. 48 ,226
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