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Unread 07-14-2009, 12:16 PM   #1
Balvar24
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1979 CJ7 
 
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Engine Smothers - Didn't yesterday

I drove my jeep into work today(79 258). It has been running like a top. Now, when I get in the gas (not a whole lot above idle) it acts like it's smothering, like the choke is on. Strange that it happened all of a sudden. What's everyone think?

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Unread 07-14-2009, 12:59 PM   #2
chill254
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If you feather the throttle to accelerate does it do it then? Also when was the last time you rebuilt the carb?
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Unread 07-14-2009, 01:07 PM   #3
KrazyGimp
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Dumb question, but have you made sure the choke is not actually coming on? You probably have but it never hurts to ask. How does the motor run otherwise, is the idle smooth? Have you verified that your timing has not changed?

A little more info would be helpful too. Like carb type, ignition, and upgrades, etc...
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1982 CJ-5 Laredo 258, T-176, D-300
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Quote:
Originally Posted by BESRK
...that's why you push in that little nipple (hehe.. I said nipple on the internet :D )
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Unread 07-14-2009, 01:32 PM   #4
Balvar24
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Carter BBD. If I feather it stops. No mods. Non emissions engine. Rebuilt maybe 10k ago at most. Idles smooth.
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Unread 07-14-2009, 01:43 PM   #5
chill254
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Is it in any gear? If you were say in the low to mid range of third and you punched it does it do it then or only when you are coming off a stop? Same when it cold or warm (the engine)?
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Unread 07-14-2009, 02:41 PM   #6
77cj52009
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Not trying to hijack your thread, but I'm dealing with the same thing. Mine seems to be worst when going up hills though.

If I feather the throttle, the engine runs much better. But if I get on it - not so good.

If anybody has any ideas to help us out, it would be great.
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Unread 07-14-2009, 03:56 PM   #7
KrazyGimp
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I ditched mine a long time ago so I don't know much about those BBD's other than they are notorious for things like that. I would say take the carb off, pull it apart, clean it out as good as possible and replace any gaskets while you are in there. There is a writeup floating around here somewhere that addresses the BBD and has some suggestions on how to make it run better but I can't find it at the moment.

Did you check your timing too?
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1982 CJ-5 Laredo 258, T-176, D-300
1972 240z in pieces...

Quote:
Originally Posted by BESRK
...that's why you push in that little nipple (hehe.. I said nipple on the internet :D )
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Unread 07-14-2009, 04:30 PM   #8
Balvar24
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Quote:
Originally Posted by chill254 View Post
Is it in any gear? If you were say in the low to mid range of third and you punched it does it do it then or only when you are coming off a stop? Same when it cold or warm (the engine)?
Low to mid range third especially. If I punch it in second or third it chokes. Up hills are the worst like the other guy said. It just started doing it today.
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Unread 07-14-2009, 05:16 PM   #9
Fireman101
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Check fuel pressure and fuel lines too. If you have a bad fuel line with a split in it, this will also cause this reaction when you press on the gas. The fuel pump pulls air in through the line and starves the carb for fuel. Best way to do this is pull the fuel line apart before the pump and put some air pressure on it to see if the line is solid with no leaks.
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Unread 07-15-2009, 06:43 AM   #10
chill254
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When you punch the gas the accel pump should be shooting fuel into the carb to make up for the sudden drop in signal. Feathering the throttle allows the carb signal to come up and allows the main jets to supply the fuel. When you are going up a hill usually some type of inrichment system will kick in to cover for the increased load on the eigine. I am no expert on the bbd though.

Try this, crank up the jeep for a minute to build up the fuel. Then turn it off and take the air cleaner off. Pull the choke open and look for a small squirter near the main barrel. Then pull the throttle and look for a shot of fuel. It should be a good constant stream and then after a moment it will end.

Also try shooting some carb cleaner in the air bleeds and the main jets and see if that helps.

Quote:
Check fuel pressure and fuel lines too. If you have a bad fuel line with a split in it, this will also cause this reaction when you press on the gas. The fuel pump pulls air in through the line and starves the carb for fuel. Best way to do this is pull the fuel line apart before the pump and put some air pressure on it to see if the line is solid with no leaks.
Good idea
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Unread 07-15-2009, 08:32 AM   #11
John Strenk
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I was thinking the same as chill here on the accelerator, Check for it squirting gas when you pump the throttle.

Quote:
Check fuel pressure and fuel lines too. If you have a bad fuel line with a split in it, this will also cause this reaction when you press on the gas. The fuel pump pulls air in through the line and starves the carb for fuel. Best way to do this is pull the fuel line apart before the pump and put some air pressure on it to see if the line is solid with no leaks.
This is a good idea but the fuel line should not build up any pressure. The vents in the tank should allow any pressure to bleed off into the charchole canister. To tell the truth, I can't think of an easy way to check this from one side of the fuel line. When mine leaked it left a trail on the cross over by the leak.

You might be able to put a hand vacuum pump on the line and see if you pump up gas without sucking any air also. Do it like you would bleed a brake line with a vacuum pump.
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Unread 07-15-2009, 09:13 AM   #12
Balvar24
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I'm storing it inside. If the fuel line was leaking, I would smell it. I'm thinking accel pump. I'll look into it this afternoon. If I tap tap tap then hammer the throttle, I scoot on down the road. Thanks for the help guys.
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Unread 07-17-2009, 08:42 AM   #13
Fireman101
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Quote:
Originally Posted by John Strenk View Post
I was thinking the same as chill here on the accelerator, Check for it squirting gas when you pump the throttle.



This is a good idea but the fuel line should not build up any pressure. The vents in the tank should allow any pressure to bleed off into the charchole canister. To tell the truth, I can't think of an easy way to check this from one side of the fuel line. When mine leaked it left a trail on the cross over by the leak.

You might be able to put a hand vacuum pump on the line and see if you pump up gas without sucking any air also. Do it like you would bleed a brake line with a vacuum pump.

Right but the point of the air pressure is to see if there is an opening in the line. I have done this several times to find a crack in a fuel line or where a rubber fuel line has rubbed a hole. If its a very small crack or leak I dont think it would cause this issue anyway.
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Unread 07-17-2009, 08:44 AM   #14
Fireman101
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Quote:
Originally Posted by arharlow View Post
I'm storing it inside. If the fuel line was leaking, I would smell it. I'm thinking accel pump. I'll look into it this afternoon. If I tap tap tap then hammer the throttle, I scoot on down the road. Thanks for the help guys.
I would check it...I was also storing mine in a garage never gave me any indication. I am the type that trys to troubleshoot the cheap stuff first.
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Unread 08-15-2009, 04:41 PM   #15
Balvar24
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Update - It was the fuel pump. Just replaced it today. Runs like a top. Guess my tank is getting a little rusty. The pump I replaced was only a little over a year old.
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