carb
Elder User
Joined: Sep 2006
Posts: 871
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A backfire through the intake is usually a timing problem or too lean a fuel mixture. You might want to make sure you've got enough fuel getting to the engine, and if so then check the timing belt, as jimdandy said.
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
I like all of the previous ideas.
Did this problem come about slowly over time, or suddenly after some event????
A weak fuel pump, or clogged fuel filter, or sticking carb float could cause a low float bowl level & lean air/fuel mixture.
Considering the vintage of this ride, vacuum leaks from dry rotted rubber vacuum lines should probably be on your suspect list too.
Also check the distibutor hold down bolt to make sure it's tight & then check the ignition timing with a timing light to see where it is & if the distributor is properly advancing the timng.
When you get your check list finished, give the battery a full charge, before trying to restart it, so you'll have the voltage for proper cranking speed & a hot spark.
If it continues to act out, you might do a compression check, or a vacuum gauge check if you can get it running, to see just what the engine is doing mechanically.
Just a bunch more thoughts for pondering. Let us know what you find.
Did this problem come about slowly over time, or suddenly after some event????
A weak fuel pump, or clogged fuel filter, or sticking carb float could cause a low float bowl level & lean air/fuel mixture.
Considering the vintage of this ride, vacuum leaks from dry rotted rubber vacuum lines should probably be on your suspect list too.
Also check the distibutor hold down bolt to make sure it's tight & then check the ignition timing with a timing light to see where it is & if the distributor is properly advancing the timng.
When you get your check list finished, give the battery a full charge, before trying to restart it, so you'll have the voltage for proper cranking speed & a hot spark.
If it continues to act out, you might do a compression check, or a vacuum gauge check if you can get it running, to see just what the engine is doing mechanically.
Just a bunch more thoughts for pondering. Let us know what you find.
Mountain Pass
Joined: May 2004
Posts: 101
Likes: 0
From: GARLAND, TX
Don't mean to hi-jack your thread. But here's my two cents.............and my own problem.
I've got an 83 with the carb'd 2.0. Had a rough idle, and would backfire when shifting. Especially if I ran the rpm up high.
Put in new plugs, new plug wires, distributor cap and rotor. Idle is better, but still a little rough. Especially when accellerating from a low rpm.
I'm gonna change out my PCV valve tonight.
Should I check my timing next? Vacuum lines?
I've got an 83 with the carb'd 2.0. Had a rough idle, and would backfire when shifting. Especially if I ran the rpm up high.
Put in new plugs, new plug wires, distributor cap and rotor. Idle is better, but still a little rough. Especially when accellerating from a low rpm.
I'm gonna change out my PCV valve tonight.
Should I check my timing next? Vacuum lines?
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Don't mean to hi-jack your thread. But here's my two cents.............and my own problem.
I've got an 83 with the carb'd 2.0. Had a rough idle, and would backfire when shifting. Especially if I ran the rpm up high.
Put in new plugs, new plug wires, distributor cap and rotor. Idle is better, but still a little rough. Especially when accellerating from a low rpm.
I'm gonna change out my PCV valve tonight.
Should I check my timing next? Vacuum lines?
I've got an 83 with the carb'd 2.0. Had a rough idle, and would backfire when shifting. Especially if I ran the rpm up high.
Put in new plugs, new plug wires, distributor cap and rotor. Idle is better, but still a little rough. Especially when accellerating from a low rpm.
I'm gonna change out my PCV valve tonight.
Should I check my timing next? Vacuum lines?
By all means check the vacuum lines & engine
spark timing.
If the PCV valve hasn't been changed at least to the scheduled maintenance call out, I'd change it & inspect it's connecting rubber hose/s & grommet fitting for hardning & dryrot signs & a tight seal.
Backfire/spitback through the carb could be a intake valve sealing problem too, so a vacuum gauge reading, or cylinder compression check may be in order, if all else checks out.
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Freshman User
Joined: Mar 2008
Posts: 27
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to all that replied thank you ,it was 180 degrees out of time but i didnt do it. it was like that when i bought it apparantly.but anyway its great now,and i dont even see how it was running that far out of time.THANK YOU ALL .
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