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When someone accidentally got 30% alcohol at a station here a few years back, cars were dying like crazy because the fuel was peeling the inside of the tanks off (including the gas station's!) They had to dig up and replace the 5 year old in ground tank after that.
Ok, update! Got the rebuilt Edelbrock back onto the truck and also installed a new filter. I noticed I could blow right through the new one whereas with the old one I had to blow quite a bit harder. Also, I'm guessing the PO installed a pre-fuel filter so I replaced with a new one too. I found the spark plug gap was close to .050" and set it to .035". Started up well after fill the bowls. Reset the idle and idle mixture and bumped timing up a degree.
Much improved! It's not as snappy as I'd like it to be, but there's a lot less of the off idle bog from before. Now, instead of dying it bogs slightly and then takes off. And it's pretty much ONLY from a dead stop. Also, I might have a small vacuum leak between the carb spacer and the manifold. I took it around the block a couple times and am fairly happy with it. Hopefully, I'll get the hesitation sorted out, but I need to fix my leaking QT case and PS gear.
Thanks everyone for your input and help! I'm certainly going to check out the fuel feeding and the inside of the tank this winter.
1977 Cherokee Chief WT w/ 2" lift
360 (originally a 401)/TH400/QT w/ MM part-time
16197427 $OD junkyard TBI set-up
Well I have not driven the jeep for a little while now because of the issues I have been getting. Now it seems that my carb may be totally useless.... it is dumping fuel into the motor. on a hunck I checked the oil and noticed it was a bit higher than it was and my fuel gauge is almost at half tank. I try to start it and let it idle a few time a week but now I guess I wont. What can I do to stop this leaking carb issue? I had just rebuilt the darn thing a little while back.
Stuka wrote:You may want to try adjusting the accelerator pump up a notch. It may get rid of that initial bog. Although thats assuming there is no vacuum leak.
This helped! Though I'm pretty sure there's still a vacuum leak. It's better as it warms up, I'd say. Work in progress!
1977 Cherokee Chief WT w/ 2" lift
360 (originally a 401)/TH400/QT w/ MM part-time
16197427 $OD junkyard TBI set-up
Stuka wrote:You may want to try adjusting the accelerator pump up a notch. It may get rid of that initial bog. Although thats assuming there is no vacuum leak.
This helped! Though I'm pretty sure there's still a vacuum leak. It's better as it warms up, I'd say. Work in progress!
1977 Cherokee Chief WT w/ 2" lift
360 (originally a 401)/TH400/QT w/ MM part-time
16197427 $OD junkyard TBI set-up
Gumby wrote:Well I have not driven the jeep for a little while now because of the issues I have been getting. Now it seems that my carb may be totally useless.... it is dumping fuel into the motor. on a hunck I checked the oil and noticed it was a bit higher than it was and my fuel gauge is almost at half tank. I try to start it and let it idle a few time a week but now I guess I wont. What can I do to stop this leaking carb issue? I had just rebuilt the darn thing a little while back.
Depends where the fuel is coming from. I don't mean to disrespect your rebuild skills, but it's possible something was left out or something. Or it could be its warped causing bad sealing, but that's very rare for a edelbrock as they are made from one piece of aluminum. Double check your idle screws to be sure they are not backed way out. Mayes just need to pop the top and inspect it.
Spent about 2 hours today tuning the truck with a gas analyzer and timing gun. I read somewhere that with MSD to set to point gap to .045', so I replaced the plugs and set the gap to that. In the Denver metro area the passing specs for 1977 vehicles is 1.5% CO and 400 PPM HC's. After much fussing and dinking with the idle screws (eeevvverrr so slightly turning), fixing a spacer vacuum leak and going a degree this way and back I think I got it. At idle I'm around 1.35 - 1.4 CO and 140 PPM HC's, at 2500 (we use a two speed idle test) I'm at 1.40 CO and <100 PPM HC's. We'll see when I get it through the test center though. I think that's pretty good for a 35 year old truck. Worst case I've got a cat I can bolt post 'Y' pipe. Best part? It runs like a champ now. The RR tire gave a good chirp during a 1-2 shift through the TH400! I feel a lot more confident going up over Eisenhower in it now.
My guess is the nice fella I bought the truck from was NOT real mechanically inclined and let a lot of stuff slide. We're getting there though!
*I think I ended up around 11 degrees of initial timing. The adjuster wheel on my gun fell off so it wasn't perfectly accurate.
**Gumby - any progress??
1977 Cherokee Chief WT w/ 2" lift
360 (originally a 401)/TH400/QT w/ MM part-time
16197427 $OD junkyard TBI set-up
Analyzers are nice for fine tuning, especially for emissions required cars, which mine is here in Denver Metro.
Mostly we use it on CIS injection VWs and Porsches, but this was fun too. If you're ever up in this neck of the woods and wanna give it a whirl, let me know.
1977 Cherokee Chief WT w/ 2" lift
360 (originally a 401)/TH400/QT w/ MM part-time
16197427 $OD junkyard TBI set-up
Did the ball and pintle get put back in the right order under the squirter?
I sure hope I did . I just replaced the fuel pump now it starts better and my mixture screws actually does something now. So after the weekend I will get under the hod again and see what happens. I did have a vac leak but it still sputters (more in second gear). I may just pull off the carb and go through it again or just replace the darn thing.
Okay now I am officially frustrated and almost threw a wrench through the windshield . I bought a new 1406 and everything was going great. I even convinced the wife to start the jeep. Well after she shut it down and I did other things non related to the carb or engine bay, i decided to test drive the new carb. Started fine, slipped into reverse (did not die) backed out of the driveway.... it sputters (what the he$%&). So I put it in drive and started moving forward then it jst dies I had to push the darn thing uphill while my wife looks on from the fron seat of the van while she drives off . Tried to restart the darn thing to no avail, no even with priming the carb or with starter fluid. Am I missing something here and is there some advice available prior to pusing this thing into the desert and putting sluggs into it ?
Martin, tell me where you are setting up target practice so I can bring mine. I don't have any engine block killing weapons so if you don't mind saving a cartridge for me to use... I can bring cherry moonshine too, what the heck.
Gumby- It really sounds like fuel delivery. Like someone poster earlier, pop the top of the carb after it dies and see if there's any fuel.
Also, i think someone mentioned fuel lines?? You can literally have a tiny hole on the top of a line that will suck air. This happened on my Fiat and the pump would lose suction and not restart. If I pulled a vacuum with my Mighty Vac it'd fire off. Finally I replaced all the rubber and steel lines to the pump, no problems again.
1977 Cherokee Chief WT w/ 2" lift
360 (originally a 401)/TH400/QT w/ MM part-time
16197427 $OD junkyard TBI set-up