im at a loss on his one

im at a loss on this one

this may be long but i want to give as much info as possible:

on friday night i was goingto my buddy justin's house and i was going up a large hill in second gear (about 3500 rpm). when i got to the top and pushed in the clutch for third the rpm never came back down from the 3500 range. then i noticed that every time i put in the clutch the rpm would rise to ver 3 grand, this was happening with the clutch in or out sitting at idle. the motor constantly wanted to run that high, even in gear. i got it ot justin's and we could not figure this thing out at all. this is what we ahve done/checked: cleaned the carb, messed with the elec choke which does not work btw, messed with the idle screw, messed with the fuel/air screws, check all vacuum lines, tried to check the timing but the engine is running to fast to check it. this happened all of a sudden while going up that hill, it was not doing it 2 seconds before. right now i have the idle screw backed way out and the suel/air mix adjusted a bit to slow her down. right now it is idling at about 1500 rpm, but i think she is now on the rich side of things. we messed with this all weekend and could not figure her out, i think im gonna buy a rebuild kit for the carb and ry that. i just dont understand what happened to make it do this

 

You sure it isn't in the fast idle linkage for the choke?

That's what it sounds like to me.

Check to see if your throttle plate is closing- it is almost impossible for the engine to rev that high with out the carb letting in air.

Also check for vacuum leaks- that is the only other way I can think of.

 

the elc choke has not worked since i bought the jeep, it was never really cold around here so i didnt realy think about it. as far as vacuum leak i replaced the seals on the carb alo, and we looked checked all other vacuum lines and did not find any. can someone tell me all th lines that i should have and where they are supposed to go

 

oh yeah and the linkages are all good, i took those all aprt and cleaned them as well. the chock plate does stick open, but when i close it the rpm goe up even higher

 

It does sound like a throttle plate. You should be idling without any throttle plate --only idle circuit. I'm wondering what changed all of a sudden. This is a stretch but make sure your timing didn't change (check for loose dist clamp).

 

I you take the thottle plate off, you will be running WOT.

The thottle plate being nearly closed is what makes the idle circuit work...

 

no no no --when I meant no throttle plate, I mean closed so the idle circuit works.

 

Hey Erik, it sounds like the throttle linkage got hung up on a heater hose. It happened to me once in a similar fashion: suddenly. Couldn't stop the thing!

 

i took the linkage completly apart from the gas pedal and all, it seems that the throttle linkage is not hung up on anything. this throttle plate you speak of, is it in the carb or outside? i know that sounds like a really stupid question..sorry

 

OK, I wasn't sure, as you seemed to contradict yourself in the post.

Mondays... I'll be awake soon.

 

You have to look down the carb to see the throttle plate, it is at the bottom,

 

the trottle plae is something we never looked at, solet me get this straight it should be closed right??

 

You might check the fly weight springs in the distributor. Maybe a spring came off or the fly weight is sticking.

 

thanks guys, i will check with the throttle plate, if thats not it i think i might have a jet clogged or something, i will probablly get a rebuild kit and a new choke since mine is broke

 

Don't think you have a jet issue, as if it was clogged, the engine would starve for fuel, not idle high...

Also, basically a carb is a toilet sitting on an engine. think if it this way...
* The tank on a tolet is the "fuel bowl" on the carb. It's only function is to hold liquid.
* Both have a "float", which only measures how much liquid is in the tank/fuel bowl.
* Both have a "valve assembly" that is physically connected to the float. When the liquid level is down/low, the valve assembly is unseated and allows liquid to ENTER the tank/fuel bowl.
* Both have a "valve assembly" that allows liquid to LEAVE tank/bowl. On a carb its called the "throttle valves". When the valves are closed, no liquid leaves the tank/fuel bowl. When the acelerator is pushed/throttle plates are opened, the engine creates a vacuum and fuel is sucked out of the fuel bowl, past the throttle plates and into the intake manifold.

My suggestion..
1. disconnect the throttle cable from the carb throttle plates.
2. Back off the idle adjustment screw so it isn't touching the throttle plate.
3. WITHOUT starting the engine, look down the carb (using a flashlight) and manually open and close the throttle plates (like suggested previously). Throttle plates are spring loaded...if it doesn't "snap" back shut, you'll probably need to replace the throttle valve (bottom portion) of the carb.
4. If step 3 looks ok, tighten the idle speed adjustment screw so the throttle plates are just open and start the engine (throttle plates still disconnected). Idle should be normal (700 rpm-ish). Manually open and close the throttle and note the rpm. If it's ok, reconnect the linkage and figure out what's binding/causing the throttle plates to be "more open" than they should be.

Good luck!

 

jerry,

thatw as a great anolgy!! it seriously helped clear some things in my head atleast. when i get home tonight i willdo what you guys are suggesting and try that, if that does not work then i will probablly break down and buy a new carb, i want a higher cfm one anyway (500 cfm edelbrock????) well, we will see what happens tonight, thans guys