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Re: Yeah, It's Me Again [Re: moparx] #3134461 04/02/23 02:23 PM 04/02/23 02:23 PM
Joined: Feb 2006 Posts: 206 MI I IROC78 enthusiast
IROC78 enthusiast I Joined: Feb 2006 Posts: 206 MI	I'm in the camp of looking at the points. I had the identical symptoms to what you describe with my 440. It would idle and run under partial throttle just fine, and run terribly whenever you got on it. Turns out the points were worn so badly that I am amazed the car ran at all. Replaced the points and it runs great and performs like it should.

Re: Yeah, It's Me Again [Re: Kudakidd] #3134470 04/02/23 02:57 PM 04/02/23 02:57 PM
Joined: Dec 2008 Posts: 742 Oak Harbor, WA W Wicked49670dart super stock
Wicked49670dart super stock W Joined: Dec 2008 Posts: 742 Oak Harbor, WA	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? 70 Dart 3400 496 New Best 6.15@110.37 660ft, 9.76@135 with a 1.34 60ft

Re: Yeah, It's Me Again [Re: Wicked49670dart] #3134565 04/02/23 07:46 PM 04/02/23 07:46 PM
Joined: Feb 2003 Posts: 8,671 A Andrewh master
Andrewh master A Joined: Feb 2003 Posts: 8,671	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?

Re: Yeah, It's Me Again [Re: Wicked49670dart] #3134572 04/02/23 08:14 PM 04/02/23 08:14 PM
Joined: Jan 2003 Posts: 7,859 Witness Protection Program Kudakidd OP master
Kudakidd OP master Joined: Jan 2003 Posts: 7,859 Witness Protection Program	Originally Posted by Wicked49670dart 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

Re: Yeah, It's Me Again [Re: Andrewh] #3134573 04/02/23 08:16 PM 04/02/23 08:16 PM
Joined: Jan 2003 Posts: 7,859 Witness Protection Program Kudakidd OP master
Kudakidd OP master Joined: Jan 2003 Posts: 7,859 Witness Protection Program	Originally Posted by Andrewh 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

Re: Yeah, It's Me Again [Re: Kudakidd] #3134617 04/02/23 10:52 PM 04/02/23 10:52 PM
Joined: Aug 2003 Posts: 43,176 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,176 Bend,OR USA	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)

Re: Yeah, It's Me Again [Re: Cab_Burge] #3134666 04/03/23 08:56 AM 04/03/23 08:56 AM
Joined: Dec 2008 Posts: 742 Oak Harbor, WA W Wicked49670dart super stock
Wicked49670dart super stock W Joined: Dec 2008 Posts: 742 Oak Harbor, WA	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. 70 Dart 3400 496 New Best 6.15@110.37 660ft, 9.76@135 with a 1.34 60ft

Re: Yeah, It's Me Again [Re: Cab_Burge] #3134839 04/03/23 06:04 PM 04/03/23 06:04 PM
Joined: Jan 2003 Posts: 7,859 Witness Protection Program Kudakidd OP master
Kudakidd OP master Joined: Jan 2003 Posts: 7,859 Witness Protection Program	Originally Posted by Cab_Burge 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

Re: Yeah, It's Me Again [Re: Wicked49670dart] #3134842 04/03/23 06:11 PM 04/03/23 06:11 PM
Joined: Jan 2003 Posts: 7,859 Witness Protection Program Kudakidd OP master
Kudakidd OP master Joined: Jan 2003 Posts: 7,859 Witness Protection Program	Originally Posted by Wicked49670dart 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!

Re: Yeah, It's Me Again [Re: Kudakidd] #3134843 04/03/23 06:16 PM 04/03/23 06:16 PM
Joined: Jan 2003 Posts: 18,419 UPPER MICHIGAN, MARQUETTE COUN... N NITROUSN I Live Here
NITROUSN I Live Here N Joined: Jan 2003 Posts: 18,419 UPPER MICHIGAN, MARQUETTE COUN...	Originally Posted by Kudakidd Originally Posted by Cab_Burge 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.

Re: Yeah, It's Me Again [Re: NITROUSN] #3134941 04/04/23 12:03 AM 04/04/23 12:03 AM
Joined: Feb 2003 Posts: 10,209 Someplace you aren't S SomeCarGuy I Live Here
SomeCarGuy I Live Here S Joined: Feb 2003 Posts: 10,209 Someplace you aren't	ATDC [censored] I want my fair share

Re: Yeah, It's Me Again [Re: Kudakidd] #3134951 04/04/23 03:14 AM 04/04/23 03:14 AM
Joined: Aug 2003 Posts: 43,176 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,176 Bend,OR USA	Your issue is the retarded ignition timing Set the initial to between 10 to 16 degree before top dead center and then rev the motor up with a good dial back timing light hooked up and working to find out where the max ignition timing is at, if it is less than 36 degrees BTDC go drive it, if it is more retard it until it is between 32 to 36 max BTDC Beware, your going to wake up the Tiger so be careful on the first couple of WOT blast Please let us know what you do and the results Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Yeah, It's Me Again [Re: Kudakidd] #3134952 04/04/23 03:16 AM 04/04/23 03:16 AM
Joined: Aug 2003 Posts: 43,176 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,176 Bend,OR USA	Don't buy the cheapest ignition parts you can find , you will get what you for and they may not last very long Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Yeah, It's Me Again [Re: Kudakidd] #3134988 04/04/23 09:28 AM 04/04/23 09:28 AM
Joined: Jan 2003 Posts: 75,008 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,008 U.S.S.A.	Originally Posted by Kudakidd Originally Posted by Cab_Burge 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. running up my post count some more .

Re: Yeah, It's Me Again [Re: JohnRR] #3135386 04/04/23 07:22 PM 04/04/23 07:22 PM
Joined: Jan 2003 Posts: 8,165 Plymouth, MI Blusmbl master
Blusmbl master Joined: Jan 2003 Posts: 8,165 Plymouth, MI	Originally Posted by JohnRR Originally Posted by Kudakidd Originally Posted by Cab_Burge 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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