Rx-7Blazin

i can get my engine started but it wont idle i had someone look at it and he saw that the valves on the intake where frose so he got them to move put them back on and they still wont moveeven though he has got hem unstuck anyone know what is going wrong???

rxseven

Did you remove the CAS? Try messing with the timing some. What is the history prior to this happening?

FC3S DreamS

my car used to not idle at all....

there are many causes for this, but the most common of them all has something to do in someway with vacuum lines... the most problematic is the BAC valve... it is located on the upper manifold on the passenger side... right above the turbo... it has a green plug on it and a water line connected to the side of it. a fix could be to unbolt the 2 10mm nuts and spray some brake cleaner in it... also, check and make sure your turbo inlet duct is not cracked and is secured to the turbo... make sure the hoses on your intercooler are tight... check your timing... its probably something dumb. i had a spare BAC valve sitting around and now it idles perfectly at 750rpm. if you have any more questions or dont know what the hell im talking about, email me at PenguinCrisis@aol.com and id be glad to help

Rx-7Blazin

i dont have a turbo but is that BAC valve those two valves for the air intake close to the exhast manifold cuz if it is then i have already taken them out and fixed them cuz they where stuck put them back on and they still dont move even though i got them un stuck

Rx-7Blazin

What is the CAS and the history is it was pulled out of another car that was rolled over and the engine sat upsideedown for a while also somehow it got water in the oil but it is now water free

Rx-7Blazin

this is one of the valves that was fixed but still wont move

Rx-7Blazin

here is the other if looking at the engine from the passenger side this is the one tward the front the last post was the rear

Rx-7Blazin

wow i just now saw this it doesnt look good

Rx-7Blazin

oh yea and my car is an 87 rx-7 na manual trans.

rxseven

The hose has nothing to do with your problem. The port actuators you show are not supposed to move till just under 3K anyway. Start looking for vaccum leaks, timing and take it from there.

Rx-7Blazin

well they dont work at all and how do i go by finding vaccum leaks???

Rx-7Blazin

hey also if i hit the gas to hard it revs to about 3000-4000 and then drops and goes back and drops, but if i hit it slow i can rev it all the way, and also if i rev it past 4000 to mabe 5-6 thousand slowly and then hit it it will drop again and go dack to 3-4 thousand and do the same thing pretty strange it has old gas in it that i put injector cleaner and fuel system cleaner and have been running it through there untill the gas will run out and im going to try to put new gas and see what happens

Rx-7Blazin

wow if that wasnt alot i also replaced the spark plugs and replaced the fuel filter and checked the fuel pressure and the pressure was fine sorry about all the writing i just want you all to know what ive tryed and exactly what its doing cuz i want to figure this out without having to take it to someone thanks to everyone trying to help

rxseven

Ok dude, first things first. A manual is a must if you are not familiar with the 13B. You can download it online and you can get the haynes one, it's not too bad.
Now, you can keep it running right? It just surges up and down? Typically when I remove the intake manifolds and put them back on, it sometimes does not seal right. There is even a technical bulletin from mazda on this. Try spraying starting fluid around the manifolds and see if the rpms increase. That's one way to check for leaks. other reasons for rough idle could be the tps and the bac valve which is on the drivers side of the throttle body.

Rx-7Blazin

i have a manual just so you know

Rx-7Blazin

can you adjust he BAC valve thats the small valve with kinda a blue front right and i havent found out what the tps is (im thinking trottle position sensor if i am correct but not sure) and do you think these may need to be ajusted or just fixed and thanks again for helping me out on this it may cinda make you mad but im just learning the basics of rotory engines (its a whole new concept and hard to find people who know anything about them)

rxseven

So when you transplanted this engine, did you reinstall the manifolds? try to check for leaks before you start messing with the BAC. Also, do you have a timing light?
Do the throttle plates close fully when you let off the gas? When you start it cold, does the fast idle kick in or does it want to die?

Rx-7Blazin

hey if you get this im online now can you do you have an aim name that i could talk to you with
i have a few questions but this forum takes to long

Rx-7Blazin

i didnt transplant the engine the someone else did it and it sounded like the guy didnt know anything about rotorys and put this engine in for 500 bucks i can probly get ahold of a timing belt but i dont know how to time anything i havent checked the plates yet but when it starts cold it usually wants to die and sometimes it does

Rx-7Blazin

Can someone help please???

diabolical1

iTrader: (3)

did you say you took the intake manifold off at some point?

if so ... check around the bolts at the lower ends (especially the one towards the firewall) and make sure that you didn't crack them - THEY ARE VERY SENSITIVE TO PRESSURE when you re-install a manifold. if the manifold is not cracked, then i'm willing to bet that you have a vacuum leak somewhere (95% sure) else. from your description of what it's doing, it has to be.

definitiely get a manual, because rotaries are quite simple, but you MUST know the basics to have any success in maintaining, troubleshooting and repairing them.

and FYI ... they don't have timing belts

let us know if you find anything

diabolical1

iTrader: (3)

actually, i just re-read your last post and i realized that i think you meant timing light, instead of timing belt.

anyway, if it will stay on while it's cold, then just a can of carburetor cleaner and spray it all around the intake and vacuum hoses while the car is running ... if the RPMs go up, then you've got a general idea of where it is, you'll just need to find.

Rx-7Blazin

no i dont think the intake manifold was taken off but could have been i was not the only owner yes i ment timing light but how do i find vaccume leaks ????

Rx-7Blazin

i found o bunch uf possibe vaccume and wire problems here if you can help me figure out where they go

https://www.rx7club.com/forum/showth...hreadid=108551

diabolical1

iTrader: (3)

well, i'm not going to be of much use to you because i'd need to physically be there to help you. however, the carburetor cleaner test is very, very simple ... and it's will only cost you the price of a can of carb cleaner (plus you'll be cleaning crap off your engine while you do it )

anyway, just spray it while the car is running and whenever you notice a sudden change in RPM, then just start using your fingers to find cracked or broken hoses, or hoses that have been disconnected ...

wish i could be of more help!