hi ppl ....wanna know what are the symptoms if you have problem with your apex seal... as my car starts off well rpm goes to 2900 the engine charges as temperature of the car comes to normal and the rpm comes below 900 my car starts vibrating and it only happens when the car is idle... as i press the throttle the car becomes norm,al everything is normal but when the car is idle it starts vibrating and i get a felling that something is blocked.
could this be a petrol issue as i put in premier instead of hi octane.... which is cleaner than premier.....in pakistan....you ppl think i have to get my fuel thank flushed or something ..........
urgent help on this please!!!

 

Use only the highest octane fuel, the engine will not tolerate midgrade or lowest levels

 

well i have changed the petrol and have had 2 refills of the tank with hi octane but still the car is vibrating on idle ....... even though the drive is excellent .. ..... what could be the problem ....?

 

well from what i hear rotaries dont have the smoothest idle. I know that when my car starts up, i have greddy elbow with no AWS tube and when i first start my car fluctuates for like 15 secs. During that time wheneve the revs fall below like 600 the car vibrates like a mo fo. I would say try adjusting you idle to about 900. Just slightly above whatever u have now and see how that works.

 

LIM (gasket?) vacuum leak?

 

hi ppl thank you for a quick reply can anyone please show me the picture of the gasket or the vaccum thing were there coould be a leak...as i am like very new to the rx7 ....... please
thank you

 

I honestly think your first step should be a compression test. If you are new to the car it's a very good thing to have as a reference, and it will confirm any questions about whether the engine was damaged by a low-octane fuel.

As for what fuel you can use, look for 95 RON or better: https://www.rx7club.com/forum/showthread.php?t=462968

Dave

 

Owning an RX-7 is hard enough in the states, I couldn't even imagine trying to do it in Pakistan. What will you do if you do need a rebuild?

 

dude there is concept of getting a rebuild .... just buy a rebuilt engine from dubai..... anyways compression test..... how do u get it done... i think the engine is gud as the car is doin 0-100 in five secs and sumthing ... but still vibration on idle... i guess .... have to chekc the vaccum ,,, dunno where it is .... my friend told me who lives in london that i need to flush my fuel tank and the car will be good after a few refills

 

I tend to think the compression is ok then, but get the test done the next time it is in a shop. It's a good thing to know.

My thought is also a gasket leak, or a bad idle adjustments. If you run a search for "LIM Gasket" you should get plenty of information.

Dave

 

Yeah the concept of getting a rebuild is quite easy to understand but how are YOU going to install it? Any good RX-7 shops in Pakistan?

Not to be a dick but it sounds like you're getting a good bit of misinformation. Maybe replace the fuel filter but I'm not sure why you'd need to "flush the gas tank". The vacuuum is found on a boost gauge which you'll need to install since they don't come stock.

This is for your car:

 

ok mounting an engine is always easier than fixing it

 

That's a very general statement. Answer is...you wouldn't fix anything if the problem wasn't with the motor.

 

my car was on the car lifter...the car was on ,,,i saw my free flow vibrating ...this means the problem is with the free flow ... the think there is a leakage in it........

 

What is a 'free flow'?

 

is the exhaust piping coming from the engine

 

Here's something you can do that is easier than getting the compression checked: get a vacuum gauge (boost gauges often read vacuum as well as boost) and see if it jumps around a lot at idle. If so, it is likely that you have a cracked apex seal.

-Max

 

Is this something he should do before fixing the "free flow" ????

 

"What we have here, is a failure, to commun-i-cate!"

 

dudes my spark plugs . one of them was cracked ......so i got them changed.. i have checked the vaccum its awrite and no the boost gauge doesnt move on idle....
but the car is still vibrating on idle,,, coulld it be the fuel filter ........

 

The fuel filter, if it is too dirty, restricting fule flow, will only affect how the car runs at higher RPM's and higher power outputs, not at idle.

 

ppl i have checked basically everything.....i have to change my cars air flter as i get the new one .... could the idling be because of the air filter... the car is running perfectly fine on high and slow speeds but is vibrating on idle.... have no idea why help please ....

 

and by the way ppl my car is a 2000 touring auto .......if that helps