Re: Yeah, It's Me Again
[Re: Wicked49670dart]
#3134572
04/02/23 08:14 PM
04/02/23 08:14 PM
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Kudakidd
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Question #1 Where is the Engine back firing? Carb or Exhaust? #2 What kind of distributor, points or electronic? #3 Where is your base timing set at idle? #4 which carb do you have? 1 exhaust 2 points 3 factory setting 4 Holley 700 double pumper
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Re: Yeah, It's Me Again
[Re: Andrewh]
#3134573
04/02/23 08:16 PM
04/02/23 08:16 PM
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Kudakidd
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so additional questions. does it do it in park? if not does it matter from what rpm you start to get on it from? and the questions above are important. have you inspected the distributor points? is it backfiring from the carb or exhaust? Not in neutral (it's a four speed) points are new backfiring from the exhaust
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Re: Yeah, It's Me Again
[Re: Kudakidd]
#3134617
04/02/23 10:52 PM
04/02/23 10:52 PM
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Joined: Aug 2003
Posts: 43,744 Bend,OR USA
Cab_Burge
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Bend,OR USA
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Did you or can you verify the TDC on the balancer and the timing cover to make sure what actual ignition timing you have now? If not get some help to do that and then let us know what you found. Also verify the firing order on the spark plugs wires and distributor cap are correct, 1843 6572
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Yeah, It's Me Again
[Re: Cab_Burge]
#3134839
04/03/23 06:04 PM
04/03/23 06:04 PM
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Kudakidd
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Did you or can you verify the TDC on the balancer and the timing cover to make sure what actual ignition timing you have now? If not get some help to do that and then let us know what you found. Also verify the firing order on the spark plugs wires and distributor cap are correct, 1843
Cab. First off. Thanks. The ign timing is 2* ATDC. I'm changing wires this week. I like the distributor cap idea. What are they thru RockAuto, $10.? lol
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Re: Yeah, It's Me Again
[Re: Wicked49670dart]
#3134842
04/03/23 06:11 PM
04/03/23 06:11 PM
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Joined: Jan 2003
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Kudakidd
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Back firing in the exhaust most of the time is a fuel/carb problem. Can you post a picture of a couple of the spark plugs? Few things to check, fuel pressure should be 5 to 7 psi, what is your base timing set to? Is this a new carb? Verify float levels at the bottom of sight on the bowls. do you have a different carb to try out? I would try to put 2 to 4 degree's more advance to see if any thing changes. Check engine vacuum at idle and 2000 rpm and note readings. Check timing at 2000 rpm and note reading. I'll take pics this week. . Replaced the mechanical fuel pump! Engine vacuum is a steady 21 in. of merc. lol. Have not checked timing at 2 rpm. Thank you for some great feedback!
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Re: Yeah, It's Me Again
[Re: Kudakidd]
#3134843
04/03/23 06:16 PM
04/03/23 06:16 PM
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Joined: Jan 2003
Posts: 18,432 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
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UPPER MICHIGAN, MARQUETTE COUN...
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Did you or can you verify the TDC on the balancer and the timing cover to make sure what actual ignition timing you have now? If not get some help to do that and then let us know what you found. Also verify the firing order on the spark plugs wires and distributor cap are correct, 1843
Cab. First off. Thanks. The ign timing is 2* ATDC. I'm changing wires this week. I like the distributor cap idea. What are they thru RockAuto, $10.? lol Have you tries advancing the timing. I would be at least 5 to 10 BTDC.
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Re: Yeah, It's Me Again
[Re: Kudakidd]
#3134988
04/04/23 09:28 AM
04/04/23 09:28 AM
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Joined: Jan 2003
Posts: 75,282 A gulag near you.
JohnRR
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A gulag near you.
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Did you or can you verify the TDC on the balancer and the timing cover to make sure what actual ignition timing you have now? If not get some help to do that and then let us know what you found. Also verify the firing order on the spark plugs wires and distributor cap are correct, 1843
Cab. First off. Thanks. The ign timing is 2* ATDC. I'm changing wires this week. I like the distributor cap idea. What are they thru RockAuto, $10.? lol 2 AFTER ?? That I believe is the wrong direction, should be more like 5 before. Without knowing how much mechanical advance your distributor currently has ( factory is seriously 30 to 33 degrees) what you want to do is bring the RPM up to 3000 and set your timing at 34-36 before TDC and see how it responds ... make note of any pinging. Once you have it up at that RPM bring it up to 5000 and make sure it's not advancing more.
Last edited by JohnRR; 04/04/23 09:32 AM.
Mainstream Media is the new Pravda
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Re: Yeah, It's Me Again
[Re: JohnRR]
#3135386
04/04/23 07:22 PM
04/04/23 07:22 PM
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Joined: Jan 2003
Posts: 8,225 Plymouth, MI
Blusmbl
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Did you or can you verify the TDC on the balancer and the timing cover to make sure what actual ignition timing you have now? If not get some help to do that and then let us know what you found. Also verify the firing order on the spark plugs wires and distributor cap are correct, 1843
Cab. First off. Thanks. The ign timing is 2* ATDC. I'm changing wires this week. I like the distributor cap idea. What are they thru RockAuto, $10.? lol 2 AFTER ?? That I believe is the wrong direction, should be more like 5 before. Without knowing how much mechanical advance your distributor currently has ( factory is seriously 30 to 33 degrees) what you want to do is bring the RPM up to 3000 and set your timing at 34-36 before TDC and see how it responds ... make note of any pinging. Once you have it up at that RPM bring it up to 5000 and make sure it's not advancing more. x2. With everything stock it probably won't be able to take much more than 36* above 3000 rpm, especially with a 4 speed. Total is more of a concern right now than initial with the backfiring through the exhaust and sluggish performance.
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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