Im abt to buy an rx7 but im not very familiar with rotary motor and I was wondering if I can get some advice from the experts and who owns one.....well the car im trying to get it idle at 1500rpm and the foes to 1000and it does that all the time can some one tell me whats wrong with it and how much would it cost to fix, and also how much do you think I should pay for it its a 1987 13b 1.3 2seater red color interior its fair and exterior has a few dents and some paint issues can I get an advice how much should much it will cost to fix thanks everyone and hope I get some help

 

Buying a car is a personal choice so let's leave that out of your question.(not tech related,see rules)
The car is supposed to start up at 1500 and drop to eventually 750 or so RPM.That is the job of the cold start assist.It is normal.
Try stepping on the clutch with the car in neutral and see the difference.

 

I have done that to the car but it just keep doing the same step on clutch and nothing and I step on it it reacts well but thats the problem im consering abt

 

So,now ya now.
It's normal to have it start up and go to 1500 and eventually fall down to 1000 and then lower to 800 or so as it gets warm.
When it won't start or revs at 1500 and stays there is when you should be a little concerned.
..and since you haven't bought it yet,you still can walk away from it!
But from what I gather,it "sounds ok".

 

You should take the car to your local Mazda dealership for a complete check-up. They will be able to give you a good estimate for all of the repairs.

Based on your very brief description, it sounds like the car is worth about $1,000 or so.

 

Yes but it keeps doing it even if its warm I drove it it felt great and very powerful but thats my only concern is it fixable and is ot expansive and yes I offer him 1000 and he agree

 

As long as the 1500 rpm falls off after a few minutes i wouldn't worry, it's the rotor warm-up.

The only times that you should ever worry about "above average" idle is when you have one of the following PROBLEMS. Increased Coolant temp at idle, High Exhaust Gas Temps at anything over 2000rpm, Low Oil pressure at idle, or "knocking" at idle.

NEVER drive your Rotary Engine immediately after a "Cold" start-up you will destroy your apex seals, they are not like normal piston engines.

Check your idle cable, they have a tendency of getting out of adjustment over the years due to heat and cold and "human tuner-actions".

 

It does exactly like this this is not my car its just a youtube video I found its this easy to fix

 

I couldn't find anything accurate in this response. Sounds like a tps issue or a vacuum leak to me. Easy to search for those tests and fixes.

 

I agree with Marc if it is doing that there is a Tps or Vacuum leak issue.
It's not the end of the world.
Haggle with the guy If you are set on getting the car.I am sure you can get it cheaper than 1k..
if not LMK where he is and I will..(Just kidding man,Good luck!)

 

I end up paying 1300 but car feels really good and Im glad I got it I really wanted a rotary engine and the 13b I heard its very reliable and powerful and one more questions guys I have no seats in the back can I adapt some if I just buy the seats??

 

You can adapt some rear seats in it but no one with legs will be able to actually sit back there. Im guessing you have a 2nd gen by how much you paid. There is a 2+2 model that comes with rear seats.

 

I agree with Marc now that i see the video. I was just making a "shot in the dark",

There is likely a dried up or broken vacuum line somewhere in a P.I.T.A place.

Also check your intake manifold for any leaks as well.

 

Agreed on TPS and/or Vacuum leaks... could also be bad grounding in the harness... To check for vacuum leaks bring a can of starting fluid and spray the vacuum lines... if the engine wants to die when you hit a certain spot, then you have found your leak... you could also have uneven compression, rent a compression tester from the local auto parts store and check it! That is the absolute best way to buy a rotary. Uneven or bad compression means a rebuild needed in the near future.

 

Thanks for all your help you have really come in handy I. Wash and clean the rx7 and post some pics so you can see it

 

make a tps check light and check the tps first

 

I agree with the tps check

 

Sounds like a Vaccume leak to me!

 

How do I check a vacuum leak or the tps

 

for a vacuum leak you can take it somewhere and have them use a "smoke machine" or just check all your vacuum lines for any cracks and or any lines that may be missing

 

Mine will idle like that at different ambient air temp because I messed with the Idle air adjustment on the throttle body, but yours does seem to be a vacuum problem more likley than anything if it still has good power I wouldn't worry about it being a bad motor.