Monsterbox

iTrader: (6)

does this sound like leaky injector?

- start the car up in the morning or after sitting for a couple hours -> white cloud of smoke...the engine runs on only 2 or 3 plugs or 1 rotor cuz the car shakes like a cam'd V8 and shoots out black liquid and the white clouds come out in bursts....then if given throttle...especially short taps the car will make a very low seperated idle like a motorcyyle....when the idle recovers it shakes between 1-1.25k rpms

- after driving it under throttle or letting it warm up to 140F (lots of backfiring until this point flames too) the car completely recovers...perfect idle smooth starting if shut off again....runs perfect the rest of the day unless sitting for more than 5 hours


- recently added 2 cycle oil premix in tank....i decided to add more than enough...now the car smokes blue terribly on startup until warm....so i know that there is way excess fuel mixture on startup


possible problems.....bad sensor somewhere, leaky injector, or problem from using bur9's or iridium race plugs in cold weather??????????

rynberg

sounds like blown coolant seals on one housing to me.....

Monsterbox

iTrader: (6)

the smoke that comes out is not thick at all...smells nothing whatsoever related to coolant..smells EXTREMELY EXTREMELY RICH enough to kill someone..i have never had problem with overheating or coolant level dropping...ever...its a reman with 40k miles on it


its almost -------as if 1 rotor is flooding with fuel and not firing or firing rough until it burns off the excess fuel in the housing


o and by the way the car still starts up immediately..sometimes way too fast when its cold

rynberg

excessive fuel is black smoke, excessive oiling is bluish smoke, burning coolant is white smoke

Fritz Flynn

iTrader: (263)

You have a coolant in the combustion chamber.

Sorry but those are all classic symptoms.

You're also in the later faze so you'll need an engine pronto

neopj3

check your injectors man. if you're running 2 cycle in the gas ( more than enough) that might it hard to start. black smoke right? hard ot start? smells like a super rich v8 and idles hard? check the manual. White smoke = coolent seal. black smoke = rich fuel mixture.

Monsterbox

iTrader: (6)

ok i just looked at the car....its much more like grey/blue black smoke...smells like a rich carb beater car...lawnmower


i just remembered that it never used to do this as bad until i upgraded to bur9's all the way around


o and too add...if i lightly boost give it half throttle it drives fine but smokes alot of black/blue out the back and smells terrible...this is before its warm as soon as it hits 180 it runs perfect


---no one really believes this is injectors???? if i try backing out the fuel mixture on the idle when the car isnt warm yet it does nothing to the smell of the fuel ocming out i really think the injectors are dumping fuel when the car shuts off

Monsterbox

iTrader: (6)

im going to have to video tape this...i hate how everyone automatically says coolant seals....coolant would smell sweet be thick like fog???

Fritz Flynn

iTrader: (263)

your right you need to replace the injector rings.

Sorry I didn't read the part about the smell lol.

Basically coolant smells like steam/coolant. You got me with the one rotor deal and black colored liquid.

neopj3

everyone says blown coolent seal! or dude your motor is gone because it's the worst case senerio. I'm talking bad about any one in particular or doubting rotary motor knowalage. but some people have never seen a blown coolent seal or have ever ridin in a car with a blown seal. I have and I know first hand. I think it's your injectors/ fuel mixture. when did you have your injectors cleaned last?????

Monsterbox

iTrader: (6)

i bought the car 6 months ago with a 35k reman in it...i doutb the injectors were cleaned and the car has 90k miles on it so i bet they have 90k on them!....i almost had a heart attack thinking it was coolant


- let me just say...it smells SO BAD that in parking lots people walk by and cough saying dude your car is going to catch flames


so how hard is it once the uim is off to pull the injectors and reinstall....what is needed in replacement parts usually?

Fritz Flynn

iTrader: (263)

The secondaries are a piece of cake but unfortanetly that's not your problem hehe.

The primaries are a PIA.

Do a search and you'll get what you need. You need to remove a few things. This would be a good time to do the hose job.

car hugger

iTrader: (1)

One of the symptoms I had when I had a leaky injector was the exhaust manifold would start to glow orange after fifteen minutes after a cold start with no boosting. It was easiest to see at night.

Monsterbox

iTrader: (6)

did you have the same cold idle problem as well?

Monsterbox

iTrader: (6)

i just ordered a fuel pres. gauge so i can test for drop in fuel pressure after shutoff

but i was also thinking of other possibilities

- could it possibly be related to the oxygen sensor? oxygen sensor bad giving false readings until the car is warm?

- bad map sensor?

CrackerJackToy

I have an '05 Mazdaspeed Miata and did an injector swap about 2.5 months ago. A couple weeks later, my car did the same thing yours is doing now. It was mis-firing BAD! It was identical sounding as a lawnmower. White smoke was pouring out. Something no one mentioned here was that, on a cold start if you have condensation in your exhaust, it WILL smoke white. Its completley normal. It is not coolant. You would smell it if it was coolant. Instead my car was stinking up the whole garage with serious gasoline. What I did was shut the car off, and restarted it and held the RPM's at 2200 RPM and it smoothed out within 15 seconds.

It happened another week or so after that, and has never happened again. My car usually misfires for the first 10 seconds of starting up, not bad like yours and my story but a couple here and there minor ones and after holding the throttle for 10 seconds, all is well. It will never misfire if I begin to drive and it has a load.

tiger18

iTrader: (1)

Monsterbox (if its really a coolant problem then before long you are gonna get the low coolant light on the dashboard :-) ,,, but your defo going the right direction with the fuel pressure gauge (pump up the pressure and see how long its holding that will give you a good indication of a fuel leak).. Oxygen sensor mmmm possibly but if your running a standard ECU then it will throw a code so you could try see if your ECU has any stored first.

Monsterbox

iTrader: (6)

cannot be coolant as it has never had low coolant or overheat...only had the light 5 months ago when a hose broke

car hugger

iTrader: (1)

No. A puff of white smoke immeadiately after startup (smelled like fuel).

Car would backfire until warmed up when I let off the gas/decelerated. I eventually fixed the problem when I installed different injectors. If you find your self replacing the injectors you should also replace the fuel pulsation dampener.

As far as the O2 sensor it shouldn't give a signal to the ECU until the car is warmed up. The stock ECU has a set cycle it runs through until the coolant temp sensor tells the ECU its getting signal. There's obviously other sensors involved in telling the ECU its at operating temp.

You might want to make sure you're getting spark to all plugs. If you haven't replaced your wires in a few years do it. Wires could be loose or corodded. Also to help with the backfiring I decided to go back to 7 and 9, the problem lessened. I was running all nines before. Also check the TPS, you'd be surprised how much that affects the cars ability to run properly.

Joe Geiman

Test fuel pressure for drop after shutoff. It should hold for at least 15 min. within a couple of lbs anyway.

Check the o2 sensor cross counts. Also, if it's not throwing any codes and no SES light, all that's probably OK.

Monsterbox

iTrader: (6)

is it possible that i have could a cracked apex seal....becuz today when i started it up...it sounded exactly like i described earlier -- like a v8 engnine car shaking violently...then i reved it up to 3k before it was warm the exhaust sounded EXTREMELY weird like a weed-eater or severe misfiring

and sure enough as soon as i start driving it runs fine...and when it hits 140F on the dime it runs PERFECT...idle is normal...got home shut it off for hour came back 110degrees now still runs perfect?

should i get a compression test? is it possible the the engine has a cracked seal that seals up when the housings are warm? I did race a mustang gt about 3 weeks ago with the car in the same weird condition and i won so obviously there has been no loss in power

as of now i'm waiting on the FP gauge...and i'm going to order new plug wires

laura

Just started my car for the first time in about 6 months battery was dead and had a hard time starting it. After fully charging the battery it started and a couple of minutes later it started smokeing alittle and looked like the manifold on the passenger side was glowing. Is this bye bye engine?

dgeesaman

iTrader: (7)

Battery is a battery problem. Always disconnect the neg terminal if you're going to let it sit for months at a time.

The glowing is probably an injector stuck open, and now the engine is running super-rich at idle. Letting the engine go completely unused with no fuel preservative is not good for the injectors. You could try driving the car a bit to get the injectors moving freely again, or use some injector cleaner in the tank.

Dave

Monsterbox

iTrader: (6)

ok installed FP Gauge....pressure drops off to zero within 2 hours....does this mean leaky injectors?

i have also noted a few more quirks -

- car backfires huge gun shots until when i let off the gas until 180F
- first time I boost after warm up smokes black out the back....clears up completely after first time


Ive alway thought this was normal about the RX7 but i may be wrong
- throttle has an ON/ OFF feel....If i let off the gas at low rpm in 2nd or 1st and then reapply even if its EXTREMELY smooth the car jerks like i let out the clutch....if i ride the throttle between the On/OFF i hear weird exhaust tone like a mixed backfire/missfire sound normal occurs if i keep the vac at idle vac when in gear

dgeesaman

iTrader: (7)

Yeah that sound slike injectors.

Dave