Hello all! I have an '82 RX-7, and it has issues. It runs choppy from the start, but it runs. The idle is rough, but once the pedal goes down, it smooths out. The other thing (I don't know if they are connected) is that when it has been running for around five minutes, the engine suddenly starts running very hard, loses acceleration, and will stall when stopped. Any ideas about what could be wrong? Thanks in advance!

possibly a apex seal spring. If one is broken, the idle will be rough and smooth out at higher rpm. Or you could just have a vaccum leak.....

Hey Rtrumpet, wooffinn here, hey rohlfr that sounds like your in the right area, I just hope not for rtrumpets sake!What kind of carb do you run? TheMazda item?I've found a couple of problems over here that may help. First things first though, How's the fuel filter? Just I had a similar prob on my '79 Rx-7 and a larger aftermarket filter fixed it.

I'not sure on how different our carbs are but I've found here that the decelaration or coasting valves can cause similar symtoms to yours. It usually just old age of rubber that causes it. Another sensor on the carb is the fuel cut solenoid. This little bastard has caused me to pull the hair out on the odd occasion!

Unfortunately without knowing what they are will probably confuse you[sorry about that!] so if you have a local mechanic, just check with him.

The solenoid needs a good earth, so just make sure the battery terminals are tight.It could be a apex prob too, but just have a look round first just to make sure nothing has come off. https://www.nopistons.com/forums/pub...#>/biggrin.png

Thanks for all the speedy replies, guys. I hope it has nothing to do with the engine AT ALL. I had the original engine go bad, and gave it to a local shop. They had the car for seven months, and then they gave it to another shop to work on. He got it running and said that he thought there was something wrong with the carb, but I was too broke to fix it then. The carb is stock, as are most parts in the car. So I may look in to that. The coasting valve and the fuel cut solenoid I had not even thought of. So I'll check that. Thanks again.

may be something of use to you,http://pittdp.homestead.com/underhood.html https://www.nopistons.com/forums/pub...DIR#>/wink.png



http://pittdp.homestead.com/underhood.html https://www.nopistons.com/forums/pub...IR#>/smile.png

Thanks Donna! It helps to have a visual of what I should be looking for. I'm gonna try those this afternoon. Here is another question for the forum, while I am racking your brains. I never really took notice to this before, but I have a parts-buying situation on my hands. This car was wrecked at some point before I got it. Anyway, the front end is from an 82, and the title reads it as an 85. What do I go with? Or do I just pick one and try it. Is there something in the engine compartment I can look for? Or is the difference between the two models minimal enough that I can mix and match parts easily? Sorry for the length of this post, guys!

Well I would probably go with whats on the title, since that is probably more accurate. You could always put an aftermarket nose on there to dress it up a bit.

just keep positive, you will get there, here is another helpfull site, http://mrmazda.members.atlantic.net/...t.html#NOSTART

http://www.rx7club.com/forum more advice here also.....

Or here, all 1st gens all the time http://www.mazspeed.com/

Thanks guys! I'll read all these pages and try some stuff. The other fun thing is I went to check timing yesterday afternoon after work, and now the car won't crank at all. I'm ready to kick it off a cliff, but then I'd miss it. Anyway, thanks. I'll get back to you on what I've done, and what worked. I think I'm going to start with new plugs and wires, then move to the coils, then the distributor, then the carb area. What do you think?

Another thing I found out THE HARD WAY. I went by the title to order my radiator (yes, I have a virtual non stop shipment of parts for this car) and so I got a radiator for an 85. The damn thing was too big to fit in the car AND close the hood. So I measured the radiator with a tape, and matched it up with (guess...you are correct!) an '82 rx-7. So now I've ordered the new radiator. Does anyone know why the 85 radiator would be so much larger. I thought the compartment size was the same between the two. Just a question.

useful stuff. Hey Donna, does that plastic plumbing pipe hold up to all the heat in the long term??

not sure what pipe and where,

at first, when I read your reply Donna, I thought you were implying I was smoking something https://www.nopistons.com/forums/pub...IR#>/smile.png



no, in your pictures with the air intake tube that you made. It has a plastic elbow(90deg). You have a link to the pics earlier in the thread.



ps, nice clean engine bay, well done https://www.nopistons.com/forums/pub...IR#>/smile.png

Woo Hoo!!!! My rx is legal again! After changing the spark plugs, the coil wires, the plug wires, fooling with the air mix, fooling with the fuel mix, fixing the exhaust in three places, tightening the throttle cable, replacing a mirror, adjusting the headlights, and fiddling with the power windows (how do you actually fix those things when they start tracking funny, anyhow). If everything in life could be this easy, man, I'd be happy, happy, happy. Now I can move on to bigger problems. I have not had a chance to get it out on the highway and let it loose yet. That was where my original problem was. When I had it all warmed up and on the highway for about ten minutes, it would get cranky and not want to keep speed, let alone accelerate. But that could have been fixed already. Man, those plugs were NASTY. Buttheads at the auto shop that dropped in the new engine put mostly fouled plugs back in the car. You have to love it when they do exactly what they say they are going to, no matter what. Anyway, thanks for the help, guys!

Woo Hoo!!!! My rx is legal again! After changing the spark plugs, the coil wires, the plug wires, fooling with the air mix, fooling with the fuel mix, fixing the exhaust in three places, tightening the throttle cable, replacing a mirror, adjusting the headlights, and fiddling with the power windows (how do you actually fix those things when they start tracking funny, anyhow). If everything in life could be this easy, man, I'd be happy, happy, happy. Now I can move on to bigger problems. I have not had a chance to get it out on the highway and let it loose yet. That was where my original problem was. When I had it all warmed up and on the highway for about ten minutes, it would get cranky and not want to keep speed, let alone accelerate. But that could have been fixed already. Man, those plugs were NASTY. Buttheads at the auto shop that dropped in the new engine put mostly fouled plugs back in the car. You have to love it when they do exactly what they say they are going to, no matter what. Anyway, thanks for the help, guys!