donrafa7

iTrader: (6)

During a hard breaking left turn my FD shut down on me (had over 1/2 tank). It would not start and i had to be towed off. After letting it sit for an hour or so i managed to get it to restart but it is now shaking quite bad and appears to be misfiring. If i gas it hard it will turn off. If i slowly get on the gas it revs fine and the vibration goes away.

Car info: 93 rx7, 130k, PFC, intake exhaust rest is stock

Tonight/tomorrow im going to start with checking the spark (im thinking maybe a bad coil) then ill move on to fuel, then check compression.

Is there any diagnostics i can run with PFC? or any similar experiences? or suggestions? thanks ahead of time

donrafa7

iTrader: (6)

checked spark and its good, whats a good way to check for fuel? ill dig into my service manual as soon as i get a chance

wthdidusay82

iTrader: (15)

I'd also check for vacuum leaks, maybe a hose popped off.

Rotary >Pistons

Sgtblue

iTrader: (16)

*With a PFC you don't get and CELs. Go to the SENSOR screen on the Commander and see what's shaded.
*Check the vacuum line at the MAP sensor. Make sure it's connected at both ends.
*Do a compression check.

donrafa7

iTrader: (6)

Anyone near upland CA (i will pick up) have a compression with a quick connect (end is rubber and you just jam into spark plug hole). I'm having a **** of a time using the screw in type.

Sgtblue

iTrader: (16)

Remember, you want 3 relatively equal pulses per rotor. Ideally you'd want to see something around 100 psi, but a little lower or higher isn't as important as having relatively equal pulses.
Make sure your battery is fully charged or put it on a charger.

RXSpeed16

iTrader: (41)

Do the easy compression check. Pull a trailing plug and the EGI relay. Crank and listen for 3 even pulses. Repeat for other rotor.

Here's a bit more thorough explanation. Is My Engine Blown?

donrafa7

iTrader: (6)

did easy test and doesnt sound good. front rotor 3 even pulses, rear rotor appears to only pulse once. Damn

wthdidusay82

iTrader: (15)

That sucks man. When it runs does it have a hard time holding idle?

Rotary >Pistons

WANKfactor

iTrader: (1)

Fuel surge lean out detonation. apex seal go bye-bye

wthdidusay82

iTrader: (15)

If he was braking and not hitting the gas how would he go lean??

Rotary >Pistons

donrafa7

iTrader: (6)

It will stay on and idle but shake really bad. Im thinking it did go lean on that hard breaking turn. I had a little over 1/2 tank.

wthdidusay82

iTrader: (15)

That sucks man. You'll have to do something to prevent it from going lean next time

Rotary >Pistons

RXSpeed16

iTrader: (41)

Could also be that you were tracking a 130k mile engine. Of course you are going to go lean when braking, the ECU cuts fuel. Well...unless you were super left foot braking.

More likely it failed during the acceleration before the turn. But at this point, it's really it doesn't matter much.

donrafa7

iTrader: (6)

engine had 30k on rebuild (from previous owner with paperwork). id still like input though as i would like to prevent this after rebuild. You might be right in that it popped before turn, before the turn there is a long 110mph WOT straight.

Sgtblue

iTrader: (16)

It's probably too late now, but you could have looked to see what your peak boost level was on the PFC Commander. If it wasn't simply an internal failure, that might have told the story....a spike or creep. Exactly what intake and exactly what exhaust modifications? Any fuel mods?

RCCAZ 1

iTrader: (10)

Didn't someone sell a fuel tank baffle a few years back that eliminates slosh and keeps the pump from sucking air?

donrafa7

iTrader: (6)

Apexi dual intake, RB exhaust, rx7store downpipe. I didn't see what it was on the straight but Boost would never go above .75 on street

wthdidusay82

iTrader: (15)

This thread has me wondering if the same thing could happen on an fc.

Rotary >Pistons

Sgtblue

iTrader: (16)

Do you have a cat or running a mid-pipe?

donrafa7

iTrader: (6)

Cat

Jkl.Hyde

which side is the fuel pick up on in the tank?