Alright so I'm at a total total loss here. I've posted before about this car. '68 Mustang with a '73 302. A week ago I had to have the distributor all the way to the left touching my thermostat housing. After taking the rebuilt carb off, I noticed the economizer valve on the bottom of the carb was warped. I had an extra one and I put it in and I was able to put the distributor right back in the middle where it's suppose to be. It has a new timing chain, firing order is right, timing is dead on. 3rd new fuel pump in less than two months. New cap, rotor and distributor/vacuum advance. New coil. New plugs. New wires. Pertronix ignitor (it had the same problem before with the points too.) Carb was rebuilt. In idle, 15 on the vac gauge. No vacuum leaks. Oil has less than 200 miles on it and is clean as a whistle. Gas is clean as a whistle. Carb bowl is clean and full. New fuel lines, away from heat so no vapor lock. Plugs were a little fouled today, but not all of them. Dry fouled, not wet.
The car starts EVERYTIME with just a half pump of the accelerator. And it idles and runs perfectly. No misses, no sputtering, no ticks. Shut it off after letting it run for 10 minutes, fires right back up no problem. I took the valve covers off of both sides, and everything seems to be ok. I even took the push rods out and none are bent.
So here's the problem. If I put it in gear, it runs a-ok. Smooth as can be. But as soon as I get it up to about 35-40, it starts to bog down, and starts making a "pop" in the carb. Not really a backfire, more like a burp. So I took it out of town tonight on a back road, and all the way getting it up to 55, it was making this popping sound through the carb. Well I turned right, and it started to lose power, and it died. But it started right back up with no problem. So then it wouldn't even go up to 30 and then it came out of it and got back up to 55, still burping. So I took a right to circle back into town, and it started to stall but I tapped the gas and kept it from dying. And then I just got into it and it got up to about 100 and it ran like a pi**** ape. It ran perfect. So I came to a dead stop, took another right and it started actually backfiring. I could see it under my hood!!!! So it would only do about 30 again. Came into town and I had to baby the pedal all the way home to keep it going as soon as I got in my driveway, it died on it's own. And the smell of fuel was really really rich when it shut off. It had even sprayed gas on the bottom of my hood. (running with no air filter so in case of a serious back fire) It also seems like hit and miss, the RPMS have to build up a bit before it will shift. Other times it shifts fine, but still has the popping going on.
I'm totally lost guys.:crying:
Today I heard a bit of a squeal. Not sure if it' was from the belt or what. What would be the signs of a bad cam? Does it sound like it's the carb? It just idles/starts too good and easy and that's what has me lost. And it runs so smooth going up to 30, and then splat. Only have a couple months left and after putting a whole new front end under it over the spring part of summer, it does this to me and I've only got to drive it about 3 times only to try to figure out what this deal is. As usual, any help would be great. Thanks guys and drive safe. :grin:
The car starts EVERYTIME with just a half pump of the accelerator. And it idles and runs perfectly. No misses, no sputtering, no ticks. Shut it off after letting it run for 10 minutes, fires right back up no problem. I took the valve covers off of both sides, and everything seems to be ok. I even took the push rods out and none are bent.
So here's the problem. If I put it in gear, it runs a-ok. Smooth as can be. But as soon as I get it up to about 35-40, it starts to bog down, and starts making a "pop" in the carb. Not really a backfire, more like a burp. So I took it out of town tonight on a back road, and all the way getting it up to 55, it was making this popping sound through the carb. Well I turned right, and it started to lose power, and it died. But it started right back up with no problem. So then it wouldn't even go up to 30 and then it came out of it and got back up to 55, still burping. So I took a right to circle back into town, and it started to stall but I tapped the gas and kept it from dying. And then I just got into it and it got up to about 100 and it ran like a pi**** ape. It ran perfect. So I came to a dead stop, took another right and it started actually backfiring. I could see it under my hood!!!! So it would only do about 30 again. Came into town and I had to baby the pedal all the way home to keep it going as soon as I got in my driveway, it died on it's own. And the smell of fuel was really really rich when it shut off. It had even sprayed gas on the bottom of my hood. (running with no air filter so in case of a serious back fire) It also seems like hit and miss, the RPMS have to build up a bit before it will shift. Other times it shifts fine, but still has the popping going on.
I'm totally lost guys.:crying:
Today I heard a bit of a squeal. Not sure if it' was from the belt or what. What would be the signs of a bad cam? Does it sound like it's the carb? It just idles/starts too good and easy and that's what has me lost. And it runs so smooth going up to 30, and then splat. Only have a couple months left and after putting a whole new front end under it over the spring part of summer, it does this to me and I've only got to drive it about 3 times only to try to figure out what this deal is. As usual, any help would be great. Thanks guys and drive safe. :grin: