When i first start my recently purchased 1991 7 (non-turbo) https://www.nopistons.com/forums/pub...#>/biggrin.png

i notice that it revs to around 4 and then falls rapidly and if i don't keep on the gas it will die.

also the idle is rough even with the engine warm and it smokes if revved high on startup (hence the smokes on startup) or sometimes when warm. if anybody knows anything that i can do to fix this please tell me.

ps a mechanic said that i needed high performance plug wires (70+) but i had just bought a 30$ set from advanced auto parts. and why would this affect the smoking? thanks

Have you tried raising the idle with the adjustment screw? The cars are supposed to rev to about 3K on startup for emmissions. When you tap the gas pedal the idle should go down to about 1500 RPM. If not then your fast idle cam may not be working properly.

on initial startup same thing 13BAce said. you will get some smoke on startup that is normal. as long as you don't get any while the car is warmed up your good to go https://www.nopistons.com/forums/pub...IR#>/smile.png

Thanks guys i'll try it and see if it works.

If that thermal wax pellet thing was removed then the car will die when it's cold, unless you hold on the gas. At least that's what I was told.

The thing about the wires is bullshit as well, NGK wires are fine, and dont even cost that much. Try to find a rotory friendly mechanic in your area, and make good friends with him. ( im attaching a pic to test to see if it comes up smaller )

Yes, with the stock ECU and without the fast idle cam the engine will die when cold.

If you need good plug wires, get some Magnecor from www.mazdatrix.com They're pretty cheap and work really well.

I've been using Pep Boys wires for 5 months. :wow:

I've been using Pep Boys wires for 5 months. :wow:[/quote]

On your 'vert? That really says a lot about their wires.

I've been using Pep Boys wires for 5 months. :wow:[/quote]

On your 'vert? That really says a lot about their wires.[/quote]

I've been meaning to get Magnecors for 4 months.

Alright,

i spent the day with a haynes manual (i know i should get a factory but i don't have the money right now) and i messed with the car as much as i could. i found the fast idle cam and it seemed to be working properly - the car revs to three on startup - but once some time has passed the car idles down and still dies when cold. i adjusted the idle so now it idles around 1,300 to 1,400 and jumps to 1,500 - it still idles rough ??? - i was thinking about the exhaust (partly clogged?) and i need to check some of the more complicated parts of the engine (injectors?) anyway i am probably going to take it to the guy who put the engine in if he is home this weekend so maybe he can help. sorry for the long post



btw, does anyone know of a good rotary mechanic in central alabama?

If the idle jumps then you may have a problem with your TPS. The fast idle cam doesn't rev the engine to 3K. The AWS does that. The fast idle cam keeps it at 1500-2K until it's warmed up.

You check for any vacuum leaks? And if youre using the stock air box, make sure it, and the duct, isnt cracked anywhere

ok guys i took the car to the mechanic and he said that the map sensor was bad, he ordered the part but i won't be able to get it installed until week after next :thumbsup:. now my only probs are the bad oil pressure gauge and the seat belt light blinking all the time. oh well even if it was cherry stock i'd still be working on it to make it better.

one way to check the 89-91 rx-7's for problems is to run the codes on them. a tutorial for this can be found at www.1300cc.com ...you run a wire from the initial set connector and ground it. then get in the car and turn the key to where the idiot lights come one, but not so the car it startted...the check engine light will flash codes corresponding with parts or symptoms that might be bad with the car. i think scott also has a manual on his site where you can cross reference these. good luck...the bouncy idle does seem like the TPS is off or bad, but run the codes and see what you get...



on a side note, does the car run and rev up ok otherwise?

map sensor? I might be mistaken with my acronyms, but don't we have a maf sensor?

map sensor? I might be mistaken with my acronyms, but don't we have a maf sensor?[/quote]

Maybe he's talking about the pressure sensor.

map sensor? I might be mistaken with my acronyms, but don't we have a maf sensor?[/quote]

Maybe he's talking about the pressure sensor.[/quote]

That's right. i believe it means manifold air pressure sensor, it is somthing to make sure there is a vacuum is side the manifold so as to know that air is going in and not coming out, i think?