Seoul Seven

So as ive posted before about other problems with my rebuild, ive been driving the car without idle for about a week and half now to and from work, little trips, ect.

Im now convinced taht it is no longer a matter of "seals still seating".

Back Story:
Rebuilt Motor, re-used apex seals, new springs and taller corner seals.
New o rings and coolant seals. Took a week of fiddling to realize its time to push start the car 40mph. worked. Held idle at 1500~1300. No big.

started driving it the next day and would hold idle only for the first few minutes then sputter to its death.

Flash Forward:
Ive been driving it since then just left foot braking and not taking my foot off the gas. It starts right up everytime in the mornings and holds idle till i get near the freeway which is about 5 min. Which tells me im not getting enough gas when its warm? cause i cant start it back up right after. only if it sits for hours.

hornbm

post some more details of your setup. What car? How many miles are on the rebuild?

Seoul Seven

1988 Base RX-7 NA
200 miles so far on the rebuild since push starting it.
Smokes blue a little after awhile of driving but its way better than it was before it was rebuilt lol. Not worried about that.

tried tinkering with the screw atop the TB didnt help with holding idle so i put it back to where it was.

Played with timing, grnated im not the best at that but it seemed to only be worse if adjusted. so i left that back alone.

MikePhillips

Has your coolant level been dropping slowly? And if not, have you checked for vacuum leaks thoroughly when it's good and hot? Hard to do if you can't get it started easily, I know, but that's all I can think of. It sounds like either your coolant system is springing a leak into your induction system when it builds pressure, or something else is expanding when hot, causing a vacuum leak.

A bad coil could cause this symptom, too, but it would typically be less consistent, more random, as far as the length of time it refuses to start and how long it takes to die on you.

There is another possibility, but it's probably the least likely, and I wouldn't mention it if it hadn't happened to me recently. I have an old Dodge work truck that I use to haul equipment, trailers, whatever. It started dying a few months ago, and the damned thing would sometimes start back up right away and run for awhile, but sometimes it wouldn't start for hours. Seemed to be getting plenty of fuel, spark, air, etc. so I changed the coil right away (been down that road many times in my life). Didn't fix it, but I got lucky one day and right after it died, I checked for fuel and the float bowl was dry. So, changed the fuel filter, fired right up and ran the rest of the day, no problem. Solved, right? Next morning, I get to the end of the road I live on (about 2 miles) and it dies again. So, right away, I get a fuel pump and put it on, and it ran again, wonderfully. For about 10 minutes, and then dies again. So, I've been down this road too. I get it back to the house by putting gas in the float bowl and driving a few hundred yards at a time. Then I took off the fuel line that comes from the tank and put 250 psi of air pressure to it (after I took off the gas cap...been down that road too), put the fuel line on, primed the carb, and it ran...finally. So, now when it starts to die a little, I shoot some air into the fuel line and blow the blockage out of the pickup screen. Eventually, I'll pull the tank and clean it out, but not until this winter, I think.

Anyway, to make a long story a few sentences longer, if all else fails, you might blow out your fuel lines just to see if maybe it's picking up enough crap to clog up about the time it gets warmed up, and the crap settles back out of the pickup screen about the time it cools off. Unlikely, I know, but a remote possibility.

Keep in mind that, while I'm a pretty good mechanic, I'm very new to these rotary critters.