I've got an odd one for you...
 

I narrowed my oil consumption down to a leak at the drain line. So I pulled the turbo off and modified a few things.

I put all back together and tried to start it up. Turned over right away, idled for a few seconds....now the odd part.

It gradually started losing vacuum untill it died. Tried again same thing. Questioned the AFM and put it in Diagnostics mode (Gnd & 10) to no avail. Holding the throttle open just ever so slightly keeps it running. Then I noticed on the WB that it's running super lean while this is happening before it cuts out. Also tried keeping the fuel pump running (Gnd & F/P) to no avail.

Not sure what the problem is...on top of that I made the oil leak worse. :doh:

Is your fp staying on, your relay migth be fuckin up. I would take of the back pannel or put the gauge on to see whats going on.

It might be time to redo the jb weld maybe it got jostled and broke the seal.

Would leaking oil slowly cause a loss of vacuum? No FP gauge at the moment, might have to wait till this weekend.

i dont think it would unless you have a blown cylinder or sticking valve not letting the oil drain properly so it has to go somewhere. I have had my fp relay stick before and not let the pump come on you might pull the battery cable to reset everything and check the relay and fuse if all this doesnt work i would cut the wires to the afm and wire it together for constant on if this works you can keep it like that or put a new afm in place.

I know I'm getting fuel pressure, If I clamp down on the return it reacts like it would normally, i can hear it build pressure. I can try swapping the AFM, but it just seems really weird.

It was running perfectly fine yesterday, I pulled the intake as a whole, unbolted the downpipe, removed the oil lines, and pulled the turbo. I didn't touch anything else. And went over my work like 20 times trying to figure it out.

Maybe you nicked, disconnected, or grounded your o2 sensor wire somewhere when you removed the DP? I'd also check to make sure that the o2 sensor was screwed in all the way into the bung.

I'll check.

maybe you have a vacuum leak?

er I mean... did you disconnect any air passages while you were working that you might have forgotten? can you do the carb cleaner trick?

ah anyway.

That's what I originally thought, I'm no mechanic though...

yeah i can try that, but its hard to keep it running and spary shit at the same time....i went through all my vacuum lines, and none are disconnected, ran compressed air into a few to listen for leaks but couldn't hear any. I still think it may just be a AFM issue.

At least it starts.

Man, WTF.

No clue...AFM, I guess? I mean, these things are getting old at this point. Were you running the RX-7 AFM or Miata one these days?

you're telling me...I've taken the turbo off at least 10-15 times now and this has never occured. It's the OEM AFM currently. I'm going to swap the RX7 one back on just to see how it reacts. I mean unless I somehow punctured the coupler off the turbo outlet I don't see what I could have done to it.

it almost sounds like a bad AFM connection. but i dont know what the vacuum looks like in that case.

Yeah I dunno, from prior forgetfulness I've noticed the car won't crank over at all without the AFM. But a swap with another unit will be able to narrow that one down really fast.

Going to try disconnecting the o2 sensor incase I did somethign with that signal.

It wasn't throwing a code, but I'll try to pull any stored ones to see if that doesn't point me in the right direction.

Otherwise if that results in no change I'm going to rip the turbo out again and try again after I fix the oil leak...again.

Don't worry about the O2 sensor. On a cold engine it does absolutely nothing. NB sensors need to get up to 600* F before they create a signal, so they are not looked at until the engine is warmed up.

To check the AFM, look for varying resistance between the blk-light green and red-green wires going into the AFM as you move the flapper door.

the car will crank with no afm it just wont run if the conection is loose it will run like shit due to no fp operation. Ive been there.

I'm betting on bad afm.

yeah, that was always my first thought. I'll see whats going on with it in a bit.

my car will idle with no AFM sometimes, until you hit the throttle then it will die. My car idled for 15 seconds one time w/o the AFM...it was odd. Check to make sure the turbo is spinning, maybe its siezed? Check all IC pipe connections, all vacuum lines, clean the AFM plug, poop on your turbo as a last resort.

it will run without the AFM hooked up. Plug in the AFM and it dies. Swapped in the RX7 AFM and same results. Somethings wrong with my a/f mixture or something. Pulled trouble code 10, which I've nver had before going to go look it up.

turbo was spinning before i took it all apart, ill check to see if I didnt do anything to it.

good news is I think the oil was leaking from the feed not the return so I might not have to pull it all again.

Hmmm...dies when you plug in an AFM, huh? Maybe you accidentally dislodged some wiring or something.

i think somethings up with the connection or whatever runs the pump...

turbo spins freely and smooth

i did put my hand over the intake and let it pressurize, then let it stall. i can hear some leaks (hard to pinpoint). Maybe it's just a bad coupler somewhere....not sure yet, going to make a rubber cap and pressurize with an air compressor so I can hear better. probably wont get to it till the weekend.

oil feed just wasn't tight enough, so no oil leaks anymore hopefully.

Cleaned the ground by the heater lines and under the clutch master....runs again...:eek4:

funny what a stupid ground problem can do to a car

...Electrical Gremlins...grrrrrrr

Didja do a happy dance? :) I had a problem with my tach cutting out and acting erratic on occasion (car ran ok though), turned out to be the same ground causing the probem.

no i was pissed and didnt put it back together. I got better things to do then fucking fiddle around for two day for freaking ground wires....jesus....

i feel yah its better than pullin the motor though

when my car would make me mad thats when I would turn it up to 18psi and beat the shit out of it.

:gay: I would just pick mine up and shake it but to each there own

wtf?


oh and also, maybe try one of these bad boys :ugh2:

i was 100% serious:bigtu:

I've got a 4 gauge wire (amp power line) run as engine ground between the upper shock mount and the side of the head where the lift hook attaches. It seemed to smooth out my idle a lot when I added it, but then my stock ground strap is frayed pretty badly.

Glad that you figured it out & all is ok. Could have been much worse, or much harder to diagnose.

Improving the grounds on my car made a nice difference. My wb o2 shows more consistent readings between headlights on & off too.

It's stupid....I'm really pissed. I acutally posted on M.net for answers for god's sake.

Did You Poop On It?

No, I'm going to put it back together tomorrow and love it and stroke it gently and apologize.

stroking it always makes me feel better

wait are we aren't talking about turbos now are we :gay: