flooding out FC3S4 N/A

[TehMonkay]

Fuel tank drops out pretty easy after being drained

[vex]

gas/oil, did one of your control rings let go?

[Shadow24v]

beats me, it was mostly blue oil looking smoke after starting but after idling for a while that was subsiding then it started spewing whitish smoke. Im going to see if it does it again today when i try and set the timing.

When i changed the oil, it was overfull with gas/oil mixture, im wondering if this adversely affected some seals in the engine. Also, there is a little bit of rust in the radiator, could this lead to a coolant seal blowing out?

[Shadow24v]

re-read your post, it was flooding out a lot before i bought it. that's what i believe was the source of the fuel diluted oil

Im pretty sure its not coolant as it doesn't have the trademark sweet smell. it smells like oil smoke and i think its burning a lot of oil, im going to double check the dipstick tomorrow morning (about 3 minutes after shutoff it was reading down 1/2 a qt from before i started it 2 days ago) im going to the junkyard tomorrow to nab a fan, pulsation damper and possibly the MOP as well. im thinking mine might be stuck wide open


btw, here's a vid of the smoke im talking about. its a cell phone vid (on dialup ATM) and i don't know why there's no sound, but it was idling at a good 750-800 and timing was bang on (i reset it and the idle)

[vex]

I saw your problem! A magic dog wanted to appear... so it said "poof! I'm Here"

Honestly it looks almost like a sea foam treatment, but if you're burning that much oil something is definitely wrong. I would check your oil injectors to see if they're actually injecting the correct amount of oil into the system. If they check out I would then look at the fuel as a possible cause: AKA some one dumped in tons of seafoam and it's burning off. If the gas is good, then I would see where your oil sits after running it for a little bit. If it's gone low your oil control rings may have taken a crap and you'll need to rebuild.

[Shadow24v]

i'll check the MOP (getting one from a j-yard today anyways). fuel is new 89 octane. i REALLY hope it doesn't need a rebuild, thats expensive it seems to have good compression and starts reliably right now so...

[Shadow24v]

well, it looks like its eaten over 1/2 a quart of oil in about 30 minutes of run time. It was at the F mark on the dipstick when i first started it after all the work, now its down to halfway between the F and Add mark. It still smokes like a banshee and the MOP seems ok, the lever moves freely and all. the J-yard MOP was frozen and missing the lines and injectors so i didn't get it. It was also idling up and down between 1000 and 1500 before i turned it off. smoke got worse with rpms as well

is this probably a case of bad oil seals then?

[Rx-7fetish]

[Shadow24v]

Originally Posted by Rx-7fetish

thanks.....



anyways, i'd like to see if its actually the MOP before committing to a rebuild. Does anyone have a known good mechanical MOP with lines for sale?

[NoDOHC]

The MOP can't use anywhere near a pint in 30 minutes. During break in, I had the MOP on my 4 port maxed out all the time and it only visibly smoked at idle. (No noticable consumption in 45 minutes of 3000 - 4500 rpm break-in).

The old 6-port engine (199,000 miles) smoked like a chimney above 6,000 rpm (yes, higher revs make the oil pressure higher, which makes the oil seals leak more). The smoke should also let up a little as the engine warms up if it is the oil seals.

edit: You can replace the oil seals ($140.00 at the dealer). You will also need to replace the coolant seals and front cover gasket while you have it apart (about $150.00 for a gasket set).

[Shadow24v]

what about if the MOP had failed and wasn't "metering" at all but had the full oil pressure going through the lines?

[Rx-7fetish]

Thats what i was thinking, and sorry i dont have any good lines

[Shadow24v]

thats ok, i found an S4 in the J-yard with a seemingly intact and working MOP. and theres an S5 too, maybe ill gank the tail lights while im there...

[Shadow24v]

well, got the MOP, lines, and oil injectors along with a non-cracked pulsation damper and a non-loose visor thingy. all for $35 + tax (and i picked up a pry bar someone left on a miata )

going to see what the deal is this weekend i hope. Plus its not that hard to switch the MOP without pulling the radiator hoses, just the intake piping and air pump.

the S5 tail lights were already MIA though

if i need to do the oil seals, it will have to wait til i finish the trans rebuild for my DD...

[Force Fed]

Good to see you got it running again. That car about aggravated the living daylights out of me That's how much it smoked when I had it running, but it would go away after it warmed up. When cold and revved though it'd look like a forest fire in my backyard lol.

I pretty much checked out everything that's been mentioned so far, back when I was on rx7club still I asked about it and got pretty much the same answers lol. Let us know if the MOP fixes it, but I don't think it will, or at least I was told it wouldn't. Pretty sure it needs control rings at least. I still recommend you completely rebuild it, same as I did the guy that bought the S5 from me. You see all the problems he's having trying to avoid a rebuild