carter popping after rebuild smells rich - JeepForum.com
 
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post #1 of 13 Old 04-17-2009, 07:09 PM Thread Starter
keithf
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carter popping after rebuild smells rich

Hey all,
I just finished a rebuilt kit for my carter bbd now it is popping or backfiring and smells like fuel. The only thing i did besides clean and replace gaskets was to drill the idle tubes out with 1/32" bit and adjust the float a little. it is set at 1/4".

also the idle mix screws were at 3 turns and 5 turns. should they be the same?

I put something back wrong. any ideas what?

thanks
keith

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post #2 of 13 Old 04-18-2009, 05:01 AM
Mike Romain
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Did you get the two ball bearing check valves back in the right holes? They are different sizes.

Your mix screws need to be adjusted for best lean idle and yes, they should be the same.

What about the computer controls like the stepper motor? What did you do with that?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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post #3 of 13 Old 04-18-2009, 06:28 AM Thread Starter
keithf
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i got the balls in correctly. the smaller one towards the back. i set the idle mix screws both at 3 turns out. i forgot to mention that the carb is off an 81 so no computer control(BTW can i still nutter this one by connecting the distributor to the ignition box).

it seams like it's flooding b/c the gasket above the fuel inlet is leaking but i put a straight edge across, held the float up and it is right on 1/4. that is really the only thing i changed except the idle tubes.

thanks for helping.

keith
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post #4 of 13 Old 04-18-2009, 06:56 AM
Mike Romain
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Quote:
Originally Posted by keithf View Post
i got the balls in correctly. the smaller one towards the back. i set the idle mix screws both at 3 turns out. i forgot to mention that the carb is off an 81 so no computer control(BTW can i still nutter this one by connecting the distributor to the ignition box).

it seams like it's flooding b/c the gasket above the fuel inlet is leaking but i put a straight edge across, held the float up and it is right on 1/4. that is really the only thing i changed except the idle tubes.

thanks for helping.

keith
Leaking out the top means the float needle and seat are dirty or the float is too high. The kit came with a new needle and seat so maybe some junk from that piece of U shaped gas line just in front of the carb got in it. That line should get it's own clean and you need two wrenches to install it or the float setting goes way off.

The one wrench holds the seat of the float needle in one place and the second wrench screws the gas line into it.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos:
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post #5 of 13 Old 04-18-2009, 07:28 AM Thread Starter
keithf
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i just lowered the float a little to where it was before i adjusted it. still getting the popping and bad idle. i'll check for trash in the seat next.
thanks
keith
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post #6 of 13 Old 04-18-2009, 12:42 PM Thread Starter
keithf
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the seat was clean. it seams like the engine is knocking a little too. any other ideas or should i just take it all back apart and try again with the rebuild?

keith
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post #7 of 13 Old 04-18-2009, 12:44 PM
Mike Romain
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Quote:
Originally Posted by keithf View Post
the seat was clean. it seams like the engine is knocking a little too. any other ideas or should i just take it all back apart and try again with the rebuild?

keith
I would adjust the mix correctly first. Do you know how to set those mix screws?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos:
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post #8 of 13 Old 04-18-2009, 12:53 PM Thread Starter
keithf
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no i don't have any gauges though.
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post #9 of 13 Old 04-18-2009, 01:19 PM
Mike Romain
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Quote:
Originally Posted by keithf View Post
no i don't have any gauges though.
It's easier to do with an rpm gauge, some timing lights even have those, but you can do it by ear.

When I set the carb, I carefully turn each screw all the way in counting the turns so I know where they started. I then back them off full rich or 5 turns out each. I get it warmed up and adjust the idle speed expecting to have to adjust the idle speed several more times to keep it at 700 rpm.

I then start by turning each screw in 1/4 turn and give it a rev or two to set. Then I listen and do it again, 1/4 turn and a couple revs. The idle speed will change as I do this, so once it is off 50 rpm, I reset it.

Eventually I will come to a point where that 1/4 turn makes the engine start to stumble. I then back it off 1/4 turn for the 'best lean' idle that will just purr or 1/8 turn with a slight rumble still for the emissions sniffer (ASM2525 dyno) and get the idle speed dialed in at 700 or nice and smooth and low.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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post #10 of 13 Old 04-18-2009, 01:24 PM Thread Starter
keithf
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thanks mike,

I'll go try it now.
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post #11 of 13 Old 04-18-2009, 01:41 PM Thread Starter
keithf
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i backed them out and turned them back in about a turn and a half before it quit. the idle did not change, it was stumbling the whole time. the exhaust is real dark and it is turning my driveway black. the popping is very constant about every 2 seconds at idle. speeds up when you upon the throttle.
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post #12 of 13 Old 04-18-2009, 01:47 PM
Mike Romain
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Quote:
Originally Posted by keithf View Post
i backed them out and turned them back in about a turn and a half before it quit. the idle did not change, it was stumbling the whole time. the exhaust is real dark and it is turning my driveway black. the popping is very constant about every 2 seconds at idle. speeds up when you upon the throttle.
Something inside is wrong then it would seem...

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos:
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post #13 of 13 Old 04-18-2009, 01:56 PM Thread Starter
keithf
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Location: auburn al
Posts: 18
thanks i'll break it down and see what i did wrong.

thanks again
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