Hey guys I'm trying to get the little 340 in my challenger running a little better. Its a completely stock 340 with headers and an Edelbrock carb (I've never touched an Edelbrock carb before this one). The car idles smooth and runs/drives good at part throttle but when you go full throttle it hesitates ...sometimes pops, sputters then gradually takes off. The exhaust smells extremely rich at full throttle but generally pops and sputters are caused by a lean condition so I'm confused.

I checked the timing and its set at about 34. I took the carb apart and it had some junk in it from sitting so I cleaned it all up and re-assembled. Helped the driveability quite a bit. The carb tuning I've done so far includes; installed an electric choke (the car starts right up when cold now); set the idles; moved the pump shot up to the largest slot which helped with wide open hesitation but its still there. The car pulls great vacuum and doesnt have an intake leak as it stalls instantly if you cover the carb with your hand.

Anyway if anyone could offer some Eddy carb tuning suggestions ...I would be gratefull.

One other problem ...the car starts right up when cold or when shut off for a few seconds it'll fire right back up but if the car sits for a few minutes (like running into a store) the car is difficult to start. Usually have to hold the throttle part open and crank away to start it up. I'm thinking the gas may evaporating? The fuel line is cobbled crap right now so that is on my list too but doesnt seem like that would cause these troubles.

So far I'm thinking plugs (what would you guys recommend), good plug wires, fuel line from mech pump to carb and re-jetting (not sure where to start though). Whaddaya guys think?

Shaun, Sounds like carb is leaking into intake when you park it and it puddles fuel and floods it out when warm. Floats could be too high or base could have leak. Also,make sure the vacuum advance works correctly and unless distributor has been curved , just set timing to factory specs. I had a 340 Dart years ago and the plugs would glaze up and pop like a lean pop. Put in new plugs and problem solved for a while. That was with champion n9y plugs. I run autolite 65's in the Cuda with no issues at all, but I don't have factory ignition. I have a Eddie 500 laying around if you want to try it. Not sure how good it is, a friend gave it to me and said it worked fine. Tell Megan and Kids hi!

You sound like your way fat on the jets. It will pop if its fat, as for your hard starting after sitting sounds like you have fuel leaking into the intake and flooding it out. Run the car for a while and shut it down. Pull the air cleaner off and see if its leaking fuel.....Hope this helps...Phill

What size eddy? 600 or 750?

Its the 1405 so google says the carb is a 600.
Timing advance works well as it doesnt have much advance at idle but comes in to 34 once revved up.

Since I only have one good arm right now I put the wife to work. I picked up an Eddy Performer at the Winter Classic for $50 and we went ahead and installed it today.

I cant believe how much the factory cast iron intake piece weighed. That thing has to weigh every bit of 75 lbs. The swap went really smooth.

Also installed some new plug wires and rebuilt the carb. The floats in the carb were way off and there was some more junk under needle seat in the screen.

Took about 8 hours but the car fired right back up and I didnt see any leaks. I haven't driven it yet but momma says its like a new car.

So maybe we'll grab some jets and take it out to test N' tune tomorrow and see what it'll do.

Thanks Dan ...did you guys enjoy the weather KK?

Yea Kil-kare was great, been there 3 weeks in a row. Payout is very good , and they had 282 cars and lots of spectators last night. Staff very friendly. Track has hook, very very consistant 60 fts both cars. Not used to that!

Unplug the vac advance and set total timing to 34/38. then plug in vac. advance andsee how much total is with it hooked up. If more than 45 deg put a 3/32 allen in vac adv hose hole and turn it ccw a turn and a half and recheck. Also the vac adv hose should be hooked to the port on carb that has vac. present while idleing.

So I finally unhooked the vacuum advance and checked the timing. It only had about 15 degrees. So I cranked it up to 37 total and left the vacuum advance unhooked but plugged the carb port. Holy Cow that was the problem ...the car screams now. Drove it all over this weekend ...now it'll lay a patch as far as you want to go. It seems to have helped the hard starting issue after sitting for a few minutes as well.



I tried plugging the vacuum back in but it pushed the timing to over 50 degrees so I'm going to leave it unhooked for now. It starts at about 25 degrees and goes to 37 when revved up right now. It still cranks ok so I'm not sure of a reason to hook the vacuum advance back up.

Now I just have to find a kickdown lickage that works. I fiddled with the one that came on the car for hours but it just doesnt fit. Along time ago I put a carb spring on the kickdown linkage to keep some tension on it and it works pretty decent. The car always shifts about 3000 RPM when in Drive which actually is about right for driving around. Just have to use the slapstick when its time to get on it.

If you have a fuel percolation problem like most Edelbrock carbs do these work well:

http://store.summitracing.com/partdetail...mp;autoview=sku

If you are hooking vacuum up to a ported source on the carb you should not be getting any additional advance when you hook it up.

Huh? With the vacuum plugged in it had 37 ...unplugged it had 15.

So I left it unplugged but bumped the mechanical advance to 37 and it runs great.

It was plugged into the front port on the Edelbrock carb.

What are the benefits to the extra vacuum advance at 45-50. Better MPG's or cruising?

One port is manifold vacuum and the other is ported vacuum. The ported vacuum only draws air during part throttle and stops sucking at idle. Manifold will be strongest at idle and decrease as RPMs build.

So the fuel pump went out on the Chally at the Mopar Nats and we actually had to get a tow home from Heath on the flatbed. Anyway I replaced the stock fuel pump with an Edelbrock 110 pump 6 psi. Now the car seems to be running really rich. You can smell it idling and driving. I'm going to play with the carb but how would changing the fuel pump effect idle and driving?

Float level is too high now.