CJ7 304 idle problem

[peterblesi]

Hi all,

I have a 1979 CJ7 with a 304 v8. I had the carb rebuilt (original to the jeep) and I'm now trying to set the idle. I set the idle screw and the mixture screws (2 of them) where it idles fine. After I put a load on the engine (drive it 10 feet), it will not idle.

Any ideas what i'm doing wrong ?

In addition to the carb rebuild, i replaced the gas tank, lines, fuel pump, filter so i'm thinking gas should not be the issue.

Thanks for any help.

 

[Quite Happy]

Hi all,

I have a 1979 CJ7 with a 304 v8. I had the carb rebuilt (original to the jeep) and I'm now trying to set the idle. I set the idle screw and the mixture screws (2 of them) where it idles fine. After I put a load on the engine (drive it 10 feet), it will not idle.

Any ideas what i'm doing wrong ?

In addition to the carb rebuild, i replaced the gas tank, lines, fuel pump, filter so i'm thinking gas should not be the issue.

Thanks for any help.

When I rebuilt the carb on my CJ7 (4-banger), I ended up having to replace it altogether. I found the bushing for the throttle shaft where it goes into the body of the carb was slightly oval from wear, and every time I stepped on the gas even a little, it would allow air in, throwing everything out of whack. When your carb was rebuilt, they should have replaced that bushing to make it airtight. I would say check that first. You may have to pull the carb off to get a good look at it. Since I didn't have the tools to remove and replace that bushing, I found it was easier to buy a rebuilt carb and send back my core.

 

[superj]

are you letting it warm up before adjusting the idle and mixture screws?

what are your screws set at?

 

[peterblesi]

superj: i am letting it warm up before the adjustments. the idle mixture screws are set at about 2 1/2 - 3 turns out. turning them in further causes the idle to drop about 50 rpm's and not nearly as smooth.

 

[superj]

what is the screw on the throttle arm set too and your time set too?

 

[peterblesi]

superj: are you talking about the idle screw on the throttle link ? If so, it's set in the middle. i have it set so it idles at 700 - 750 after it's warmed up. as for the timing, i believe it's set to 5 deg btc (to spec).