I have a 302 50-H0 engine with a C4 and a Holley 600 4 barrel. The engine generally runs great. Starts up no probelm and no hithces when running lower speeds. The problem I am having is after traveling 5-10 miles of consistent highway speed. The engine suddenly drops RPM, like the throtle is being pushed back. The engine continues to run but if i try to give it gas it doesn't rev up. After rolling to a stop the engine will stall out. After a few minutes it will start right back up and go another 5-10 miles at speed before it does it again. I've changed the coil and fuel filter. I've locked down the choke to stay open. I'm trying to trouble shoot and need some advice. Anyone have a similar problem? I thought maybe the fuel pump, but why would the car start back up and run again? I thought maybe the distributor, but I figure the car wouldn't start back up if it was bad. I thought maybe the carb is flooding but I don't know how to check for that or why that would suddenly start happening. Could the tranny be slipping out and causing the power loss and eventual stalling.....?
Once upon a time I had a similar problem. Ended up rust from the gas tank was clogging the fuel filter.
Ditto, it's running out of fuel. Clogged fuel line or filter. Also remove the fuel inlet fittting from the carb and see if there's a bronze "rock" filter behind it. These are in the dual feed Holley's and get over looked, don't recall if they were ever used in the single inlet models though.
He says he just changed the fuel filter. You know, a common problem is in the tank. There is some kind of cloth filter (I think, I may be just repeating what the hallucinations are saying?) in the tank at the fuel pickup. It tends to clog up the outlet slowing fuel flow.
Makes no difference. I've seen new filters get clogged quicker'n **** when there's a lot of trash in the lines and tank.
True, and it should be checked, since his problem is one very similar to a clogged fuel filter. But he said he just changed it and it still runs like crap. A second check will not hurt, and if it is crap in the system, problem solved. So, yeah, check your fuel filter.
It's a new tank. Only a few years old. Its a mecanical fuel pump. Do those tend to die out if your hard on them.
Might be your float level's too low too. Or a bad fuel pump diaphram. Usually when that goes, you end up with fuel in the crankcase oil. Check the oil level and smell the dipstick.
I think it's fuel related. My single inlet Holley had the brass filter in it. I changed it with a new one, but sometimes it would get crazy and cut off the fuel flow. I don't know how it did it, but when it would quit running, you could tap the inlet and hear the spring and filter jump into place restoring fuel flow. I took the filter and spring out, no more problems....
I just went out and smelled the dipstick. The oil does have a fuel smell to it. I guess I'll have to replace the fuel pump and flush and change the oil. Will also do another new fuel filter. Could the fuel getting into the oil cause oil to burn off excessively quick. Could the oil be getting into the fuel a well before going to the carb.
yes if you are using a mechanical fuel pump you can get oil through the timing chain cover if the pump is leaking through the shaft seal, this could also cause fuel delivery issues.
what type of distrubor are you useing? do you have an ignitons box (msd, duraspark, etc.)? are your fuel line far away from your exhast system? im thinking that your ignition module could be over heating, or that you could be experiencing vapor lock.
I had a similar problem in my maverick, but it never did anything weird on the freeway, just after I stopped off of the freeway it would stall, until I started going again, I figured it was a problem in the idle circuit of the carburetor. I just ran an Edelbrock and it went away.
