I'm Finally Driving It!!!!!!!!

[GLTHFJ60]

Thanks for the reading, but i meant what type of Vaccum gauge I should look for.

BTW, I checked the secondary, and it's closed. I finally got it to run at 1000 rpm's with the choke so I could visually inspect the engine while running. I then saw that the fuel pump does not like the fuel that is coming into it. In other words, it's spewing gas, that's the problem.

My logic is that the amount of gas that leaks out of the fuel pump at low speed would be enough to not let it idle. When I revved it up, the forced volume that runs through the pump was enough to run somewhat smoothly. Therefore the fuel pump is the culprit.

 

[GLTHFJ60]

Well, I was dead wrong. I just changed the fuel pump and the fuel filter on my rig, but it still does not idle. I am very confused, because there was quite a significant amount of fuel leaking from it, so I thought that that was the problem. I guess not. Now it will run at 600-750 rpm's somewhat smoothly, but only with the choke in.

I also checked the spark plugs after running for a couple of minutes at 600 rpms to see if they were wet or not, and at least one was. Maybe I need spark plugs?

I will also buy a vaccum gague to test the amount of vaccum at my intake manifold. Where should I buy it, and what readings should I be looking for?

 

[chitown40]

Any auto parts store should have a decent vacuum gauge. You should have at LEAST 16mm/hg vacuum at idle with the choke open (knob pushed all the way in). IT sounds like you have a vac leak either at the base of the carb, at the insulator where the elbow tube comes out on the driver's side, or internally inside the carb. Retighten the carb base bolts and after you get the vac gauge wiggle gently the elbow tube at the insulator and see if your readings change at all. That might be a clue in the right direction. Also read the Vacuum 101 in the Tech Links as it explains quite a bit as to what the readings on the vac guage mean.

You're plugs are probably not the cause of it not idling, but rather a cause of rough idling or missing. Wouldn't hurt to clean them or replace them.


Good luck.

 

[GLTHFJ60]

Thank you for the advice. I'll go and buy some new plugs this week, as well as a vaccum gauge to test my truck some more. I was really pissed that the fuel pump didn't work, but it was a problem that needed fixing anyway. Oh well. I'll figure it out eventually.

I'll keep you posted.

 

[chitown40]

I don't know whay I ever got started replying to this thread....

Same thing happened to me today. Although I'm pretty sure my prob is a bad ground on fuel cut solenoid. Had to run with the hand throttle on at about 2000rpm to limp her home from WI today. Not fun... probably dropped my mileage down to FJ40 levels.

 

[GLTHFJ60]

That's interesting.....

If one had a bad ground on the fuel cut solenoid, would it click if one plugged the green connecter in while the ignition was in the "on" position?

 

[chitown40]

It still might click, but might not work properly. Ask LowTide and he'll swear by the extra ground wire. Mine are all melted together with the carb cooling fan wires. So, I'm going to started with rewiring both of those and go from there. I suppose the solenoid itself could be bad, but I'll have to pull it out and see.

 

[chitown40]

Ok, great. Before I even started messing with the wires, the truck starts up and idles perfectly. Went through the FSM and checked all the vac switches, VSVs, fuel cut solenoid, etc. Everything is fine. Is it possible that some small speck of dirt lodged itself in my idle circuit and eventually worked itself out or got pulled through?

Also, float level is good, and unchanged under acceleration, as well as no leaks from the fuel pump.

 

[GLTHFJ60]

That's what I'm guessing. I went to start my engine this morning and it wouldn't even run with the choke in. I needed to have my foot on the gas for it to run.

I almost want to just buy another carb and desmog because this is just too much of a pain in the balls. I gotta get that vaccum gauge for testing to make my final decision though.

I guess the suspension is waiting a bit.

Oh well.

 

[chitown40]

Get it running right before you desmog. Check your vacuum and if it's still good, you probably have something blocking a passageway in the carb. Check out the Emissions manual and check all the systems involving the carb and their respective components.

 

[GLTHFJ60]

I meant buying the new carb, which would be non-us, making sure that the engine runs, and then desmogging, all in one step. I'll try to diagnosis this one first. Such a pain in the balls though. Why won't it just work?!?

 

[GLTHFJ60]

An Update.

My uncle is in town from Connecticut. Since he's a wiz when it comes to gasonline powered vehicles, I showed him the truck and it's problems. He said that he thought that it was lean, so it might be a vaccum leak.

After obtaining a vaccum gauge from the parts store, I hooked it up to the tube that comes out of the carb spacer, and it read 16 inches of Mercury at 1150-1200 rpms. I was ecstatic. There was no vaccum leak.

There was still the problem of not idling, so we took it out for a drive after getting it to run and after driving more and more, it ran smoother and smoother. It seemed normal after a period, so we let the choke in. When coming up to a stop sign, it stalled. It wouldn't idle.

We kept the choke in and kept driving. On a long straight, we opened it up in second and third gear, to try to dislodge anything that might be stuck in the jets. It worked. After that, it ran perfectly.

So in conclusion, make sure to run your truck up to the redline once in a while so that it keeps clean and free. Also, don't assume that it will run perfectly every day. These are primitive trucks and don't always run perfectly. Good game.

I can now drive it again.

 

[chitown40]

Good to hear. I just went through all the systems on the carb a little while ago and everything tested ok. Checked PCV and EGR, both move as supposed to. Then I pulle doff the four vac hoses at the carb base valve cover side and blew carb cleaner through the ports. One seemed clogged at first and then the cleaner went right through. After burning all of the carb cleaner out, it idled perfect again. Took it for a test ride and all good.

Two happy endings.

 

[GLTHFJ60]

The best of all possible worlds.