383 timing issue or carb?
#1
Mopar Fan
Thread Starter
383 timing issue or carb?
The car is a 1964 Chrysler 300 with a 65 383 in it. Stock heads and cam. Only upgrade is an intake, 4 barrel carb, and it has an orange box and electronic ignition. I started the car this weekend and had the timeing set at 20 degrees. The car was backfiring flames out the carb while starting. After a few attempts i got it started after setting timing at 14 degrees. I was only able to set timing while car was off. The only way i was able to keep it running once started was setting the idle at around 1,500. It still was backfiring out the carb with flames. I am right in thinking its a timing issue? Or could it be the carb?
1) What should timing be set at?
2) I have an aftermarket harmonic balancer on the car. What is best way to mark the timing marks to help set timing while car is running?
3) Lastly what is best way to adjust the carb? Its a Carter AFB 500 cfm.
1) What should timing be set at?
2) I have an aftermarket harmonic balancer on the car. What is best way to mark the timing marks to help set timing while car is running?
3) Lastly what is best way to adjust the carb? Its a Carter AFB 500 cfm.
#4
Mopar Fan
Thread Starter
Yes i did have the distributor out of the car. But would it run with it 180? I kept it running at high idle for like 15 minutes and seemed to running a little rough but not bad. It just wouldnt stay running at a slower idle.
#5
Mopar Lover
I think it's time for a deep breath and back to basics. Three things I would do first.
1-Check and recheck wire order at cap (firing order, proper rotation).
2-Number one plug out turn until it blows for compression stroke and set rotor at #1.
3-Turn crankshaft back and forth until resistance is felt when trying to push valve springs, this will tell how loose the chain is. Can be done with fan by the belt or with a wrench. Actually I would do this first.
1-Check and recheck wire order at cap (firing order, proper rotation).
2-Number one plug out turn until it blows for compression stroke and set rotor at #1.
3-Turn crankshaft back and forth until resistance is felt when trying to push valve springs, this will tell how loose the chain is. Can be done with fan by the belt or with a wrench. Actually I would do this first.
#9
Mopar Lover
I forgot to say that with the big block and cap off you should see the rotor move immediately as you turn back and forth, this will confirm no slack in chain. If your confident then move on to the basic timing.
#11
Mopar Fanatic
I have seen a engine run on 180,, not to good,,, Its 180 out if its backfiring threw the carb and exhaust
Last edited by PURPLE HORONET; 04-16-2013 at 08:22 PM.
#12
Mopar Fan
Thread Starter
It is a non letter series. I understand the letter series had the 413. Mine is a 383 and has an aftermarket intake and 4 barrel on it. The previous owner had put it on. I do not know what the intake or carb was off of. Previous owner gave me original intake and 2 barrel carb but they are packed away.
I was able to double check the wires. They are in the correct order. I will pull the distributor tonight and spin it 180 and see what happens.
I was able to double check the wires. They are in the correct order. I will pull the distributor tonight and spin it 180 and see what happens.
#13
Mopar Fan
Thread Starter
i spun it 180 and now its really backfiring in the carb and not starting at all. Its popping pretty bad in the carb. I will spend more time with it tomorrow.
#15
Mopar Fan
Thread Starter
The car sat for 9 years. In the last year I started working on it again. So in the last year I rebuilt carb, had the valves resurfaced, replaced head gaskets and removed the distributor while doing all this. So I had carb off, intake and exhaust manifolds off, distributor out and heads off of engine. I have done a ton of work on the rest of the car too.
#16
Mopar Fanatic
The car sat for 9 years. In the last year I started working on it again. So in the last year I rebuilt carb, had the valves resurfaced, replaced head gaskets and removed the distributor while doing all this. So I had carb off, intake and exhaust manifolds off, distributor out and heads off of engine. I have done a ton of work on the rest of the car too.
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Sjzdx (04-19-2013)
#19
I have a 75 318 2 barrel that’s back firing out carb.
installed new timing chain, coil, distributor, wires and plugs. All cylinders have compression.not 180 out truck ran fine then suddenly backfiring. The carb was purchased new in 2019 did not drive for two years. No vacuum leaks. The only thing I can see that’s left is to buy a new carb. If I’m missing anything please let me know. I’ll order a carb tomorrow hopefully it fixed it.could the ecu cause this?
installed new timing chain, coil, distributor, wires and plugs. All cylinders have compression.not 180 out truck ran fine then suddenly backfiring. The carb was purchased new in 2019 did not drive for two years. No vacuum leaks. The only thing I can see that’s left is to buy a new carb. If I’m missing anything please let me know. I’ll order a carb tomorrow hopefully it fixed it.could the ecu cause this?
#20
Super Moderator
I have a 75 318 2 barrel that’s back firing out carb.
installed new timing chain, coil, distributor, wires and plugs. All cylinders have compression.not 180 out truck ran fine then suddenly backfiring. The carb was purchased new in 2019 did not drive for two years. No vacuum leaks. The only thing I can see that’s left is to buy a new carb. If I’m missing anything please let me know. I’ll order a carb tomorrow hopefully it fixed it.could the ecu cause this?
installed new timing chain, coil, distributor, wires and plugs. All cylinders have compression.not 180 out truck ran fine then suddenly backfiring. The carb was purchased new in 2019 did not drive for two years. No vacuum leaks. The only thing I can see that’s left is to buy a new carb. If I’m missing anything please let me know. I’ll order a carb tomorrow hopefully it fixed it.could the ecu cause this?
This ones been dead since 2013🙂
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Icepickchris (01-08-2022)
#21
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