Munind

iTrader: (1)

I have owned my 93 FD for a few months now and it would always start up no questions asked.
I ran into an issue about a month ago where the car suddenly would just crank and crank but wouldnt start.
After a long long while of cranking it finally started, struggled, but ran fine after that....

I did not have any problems after that then fast forwarding to here recently to about a week ago....
The car would start but kinda sputter at low rpms ( under 1k )
If given a little bit of throttle, it would back fire.
However, once it ran for about 2-3 minutes while sputtering, it ran like normal.

This has been a consistent issue till today
Im not sure if this matters to the problem but the car was stone cold and i went to add coolant before i try and start the car
and there was still pressure built up, so coolant spewed out when trying to take the coolant cap off.
I checked the oil cap and it was dry ( usually has some moisture )
Any who, I went to start the car and it again would sputter however this time after not even 30 seconds the car just died and would not start again
The car would still crank and crank but wont start
I can hear the fuel pump priming
When the key is left on the on position after cranking there is a long beep or buzzing sound coming from the engine bay and goes away when the key is turned off

Overall, im thinking maybe no more spark or an issue with getting fuel to where it should be.
If someone could point me in the right direction that would be greatly appreciated!!

Current Mods if it helps narrow the cause:
Apexi Power FC
Center mount intercooler
M2 Performance intake box
AST
No cats
SMOG Delete

risp33dy

Sounds like the car might be flooded. Check out this post:
https://www.rx7club.com/3rd-generati...d-help-324236/
Hopefully thats it.

Rotary Alkymist

Do you smell gas when you're cranking? Sounds like plugs. I would inspect the spark plugs.

Munind

iTrader: (1)

I do smell gas, im going to give that a look today as well while i try out the thread that risp33dy sent.

Munind

iTrader: (1)

Sgtblue

iTrader: (16)

Check the line going from the filler neck to the AST and from the AST to the overflow tank. Make sure it's clear and not kinked. You might check your caps too...but something is up. Worse case scenario is explained in the links. Leaking coolant could also explain why you had to add coolant, hard cold start and initial stumbling idle....
https://www.rx7club.com/3rd-generati...essure-409994/
https://www.rx7club.com/3rd-generati...-wrong-188207/

See post #3 here for additional, possibly related symptoms:
https://www.rx7club.com/new-member-r...r-seal-941463/

Munind

iTrader: (1)

Thank you for the additional information. I will definitely take deeper look into this as i ran into cooling issues after i got the car started.

UPDATE:
I let the car idle for about 10 minutes and took a step away from the car for 2 minutes and i heard the "add coolant" light beep and ran back to the car and the temp read 122C on the PFC.... I immediately cut the car off and just hear some sort of ticking noise coming from the engine bay.
I honestly don't know what went wrong .....
I look on the ground and see a medium sized flow of coolant under the passenger side headlight (i concluded it was from the overflow tank )
Fast forward a little bit as i let the car cool down.
I removed the intercooler and intake to take a look at the lines as you mentioned and the lines were good.
I then go to add coolant to the AST till it was full, closed it and left the lift tab on the cap up, then added more through the filler cap till it started spilling out through the overflow tank.
( added a little over 3 quarters of the gallon )
I started the car again and sat in there watching the temps and everything was normal again.
when the car got to 96C the fans would turn on and drop to 90C
I checked the coolant after i let the car cool down and it was where it should be.

I still want to try and bleed the system. Hopefully, there is just a pocket of air that is evaporating my coolant away....

Sgtblue

iTrader: (16)

Munind

iTrader: (1)

That would definitely makes sense. Im not sure if it is another dead give away or if its a "normal" thing but before my whole problem started i would add oil here and there. While doing so i noticed some sort of green slime or something on the oil filler cap. I assumed it was coolant in the oil so i checked the dip stick but the oil looked how it should. Just to be sure, i did an oil change and again it appeared to be looking how it should. Would this be a sign of "mild" coolant seal failure? Essentially, would this mean i should be looking at getting a rebuild in the near future?

Sgtblue

iTrader: (16)

There really is no "mild" coolant seal failure. It's like saying someone is "sort of" pregnant or "mildly" dead.
It's going to require complete disassembly of the engine block, so typically any other wear items are replaced at the same time and things like injectors are cleaned. As I mentioned in that link, I wouldn't wait too long. Depending on where the failure is, putting it off along time can cause corrosion of the irons and make them unusable.

Munind

iTrader: (1)

Ah i see, makes sense. Thanks for all the useful information and time, i really appreciate it. Time to reevaluate my plan for the FD.