FC3S Kidd88

this randomly happens sometimes when i start the car, i start it and it wil rev high ( like usual ) to around 3k rpm, then drop down except it doesnt drop down to 1 like usual sometimes it jus drops and dies out! this randomly happens sometimes i have no idea why, i tried using fuel injection cleaner and i might clean out my throttle body this weekend to see if it will help

i have no idea why this started happening but it happens randomly and it started a couple of weeks ago, jus thrown this out there but i read on this forum ur not suppose to use synthetic oil ( i used it ) but could that have any connection??
( and why is using synthetic bad i thought it was suppose to be better lol )

any input would help and would be appreciated cause im an extreme noob to rotary, thanks =]

Chuck

iTrader: (2)

The synthetic oil would not cause the stalling problem. Using a high quality synthetic like Mobil 1 is acceptable. Just don't use synthetic blends.

If your stall problem only occurs on cold starts, you may need to check and adjust the thermowax. It is part of the cold start system. Check the factory service manual in the "Fuel" section for a description of the cold start assist system and thermowax adjustment.

If the problem also presents itself on starts when the engine is already warmed up, then you may have a vacuum leak. Vacuum leaks can be tough to find but they will play hell with starting and idle. Check all the usual suspects like vacuum hoses for loose fits and cracks, but also check gasket fittings and seal at the throttle body, and at the intake manifolds. Each fuel injector has rubber O-rings that seal their fit and if these O-rings are old and brittle, they could cause vacuum leaks.

Unfortunately, there's no magic fix to the problem you're having. It might require some close detective work to find and fix.

Sideway_Drifter

I just bought my RX-7 the other day and i was trying to fix some parts in my engine. Then when i put all the parts back on my engine, and started up my engine it started to rev like that. It rev's up to 45k then drops to 3k. I don't know what the problem is either, but if by now you figured out the problem please tell me. Thanks.

FC3S Kidd88

yea when its cold and i first start it, it revs to 3k and moves down slowwlyyy as the engine gets warmer lol

but yea ive checked the usual vaccumes etc and no leak : / ( well didnt find one n e ways )

but this stalling problem only happens randomly like once every few days or so and its warm whether out now, i found out a way to prevent the stalling tho, like before it drops to 0 rpm and dies i jus tap on the gas to 1 or 15 and it jus stays there and is normal...rotary= freakn weirdd, but i <3 it

FC3S Kidd88

"the reason synthetics (mainly blends) are bad for our cars are the high ash content when they are burned, as you will read sevens have oil injection used to lubricate and maintain the apexseals but while doing so some (very little) oil gets burned, which using the 'right' oil is perfectly normal, but using oil that burns and leaves alot of residue or ash will create problems down the road"

thats what some guy told me in another thread by the way about the oil

SureShot

Here's the deal. The rotary engine makes great power, but torque really drops near idle.
Switching loads & conditions make a hard throttle stop ineffective at keeping it from stalling.
Mazda had to add 2 or 3 air bleed solenoids, and a cam along side the hard stop that's pushed down my a thermo-wax plunger that's heated by a coolant circuit.
Then, in case all that gets out of adjustment the ECU checks the TPS to see if the throttle is on idle, if so and if the revs go above 1500, it cuts fuel.

The "fuel & emissions" section of the factory manual has all the adjusting procedures.
Those who don't read the manual end up selling their cars to those who do.

matts86fc3s

its supposed to rev to 3k when you first start it up when its cold. its part of the "cold start" or "accellerated warm-up" operation for the rx7. all it does is just help it warm the car up cuase we all know now a days every idiot out there doesnt let their car warm up... they just crank it up and put it in drive or reverse. not good. anyway... its normal for it to rev to 3k then back down to 1k after about 15 seconds.... but as for it dying out... thats something else... could be your tps, your b.a.c. valve, afm, or a vaccuum leak... all of these can afffect it dying out.

FC3S Kidd88

when its cold it revs to 3 and slowly moves down to 1 after about like 10 minutes?

Sideway_Drifter

Yeah my car just stays at about 3k or 4k and never goes down at all. It just stays there forever. How long should i wait to give it time to go down. And i tried to adjust the throttle but it just starts up and then shuts down on me. No matter how many times i step on the gas it just goes down again and shuts off on me. DO any of you still know what is wrong with my FC.

Icemark

That is BS, told generally by cluelss people that can't be bothered to look up the specs on a oil.

Most synthetics have a considerably lower ash content than conventional oils.

And ash and residue are two different things. Ash is what is left after something is burned. Residue could be something as basic as sludge in a motor because you used crappy vavoline conventional oil.

You need to read the FAQ for FC sticky thread found at the top of this section before posting. It covers many of the commonly asked questions such as several of the ones you started this thread with.

Icemark

It should drop to around 1500 at less than one minute, and slowly work its way down from there.

It is does not work its way down, it just drops the throttle body cold start thermovalve is sticking or needs to be replaced.

If it never drops, then the throttle cable, throttle plates or throttle body cold start thermovalve is sticking.

FC3S Kidd88

yeah i replaced the thermostat a couple of months ago actually and it helped the rev drop down faster and yes it does drop down to 1500, and as for readn the faq above i shoulda first sorry


rx-7's are to much to handle for a 17 yearold kid haha

FC3S Kidd88

guys i know how to solve our problems forever, lets invest in HONDAS


im joking please dont threaten me

88rxn/a

iTrader: (6)

this is what you should have said!!!

FC3S Kidd88

hahah eh w/e its okay ive got a 99 corolla for my reliable driver

Sideway_Drifter

I do have a honda. IT's a 96 Civic Ex coupe. it's a really nice car actually. Realible and everything you need is there. It's just that it's so so so so rare, you see it everywhere you go. (it's a joke) But i do drive a honda though. I just bought my RX 7 and it's pissing me off cuz that **** is hella hard to fix right now. Damn throttle!!!!!!!!!!!!! But hey i paid a good deal for my Mazda. $450 cash. and still runs after sitting there for 3 years. Crazy **** huh.