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Looking at my pasty posts I cringe a bit but now want to give my rx8 a proper shot at a good revival

I suppose I was meant to give it that seeing as how it came back to me like this, untouched since i last worked on it

I just ordered new ignition coils and looking into getting a new starter solenoid to rule out its terribly drawn out startups

The starter is a remaned N3H1-18-400R0A it looks clean and the teeth in tact

The heater core was bypassed so I'am assuming that might be what is lending to its overheating as well

During idle its rpm sits still for a while until it revs up a little then back to its usual rpm

It does not or very barely turns on after heating up past normal temperatures so I'am not sure why that might be the case

It has new spark plugs

It has a new thermostat (given I bought it 2 years ago when i first got the car but the car itself hasant seen much action since then)

I already have an appointment to check its engine compression but besides these problems I see and plan to fix is there any other I should be aware about?

Renderless

Sidenote: I just premixed with 4 ounces to 5 gallons of 91 and it eliminated what I can only identify as "misfires" It use to have when I went up in rpms but consequently added 2 ounces of motor treatment seafoam to it and it slowly turned off me as i held it in high rpms (7) with a little bit of oil being shot down the bottom of the car...I came back to fix the car but I might have just messed it up even more so iam not sure how to about this anymore ( i was going to do a seafoam treatment but opted into adding it to the tank first before doing the complete procedure into the chambers)

mazdaverx7

iTrader: (6)

The very first thing you need to do is verify compression with a rotary compression tester. There is no reason to keep fighting with and throwing parts at a weak engine. An engine that's on the lower end of the spectrum can be helped along with new and strong ignition components, a 2kw starter and a good battery. However, if it's too low, then it will be time for an immediate rebuild or replacement.

However if you are experiencing hot start issues, you need to compression test your engine properly and at normal operating temperature.

I would fix the bypassed heater core. It could have been bypassed because it was leaking. If the engine is overheating, it's likely not because the heater core was bypassed. If your cooling fan is working properly, the radiator is good, belts are good, and the water pump is good, I would look at a possible coolant seal leak or a corroded coolant seal channel in the housing or housings. Is your engine consuming coolant or just getting too warm? Have you verified actual engine temp on live data?

Renderless

Ill get the compression test as soon as possible

The overheating issue might be me overthinking seeing as my temp gauge never redline but i assume is a problem since the car doesnt want to start after it gets too hot

Looking at the passenger side I believe i see the crack in the white plastic since the floor is stained of coolant so itll be a new heater core regardless

New engine or new engine rebuild will happen to this car if need be I've set it upon myself to fix this car before i leave this house

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I have a compression test scheduled at my mazda dealer (i was going to do a full diagnostic but that isnt included even thought they told me at first it was? Welp i can use an obd tool to diagnose my other issues)

CaymanRotary

Just have them do the compression test. You don't want them charging you $150 to hook up an OBD2 which you can do yourself. Post your readout sheet here when you get it.

Renderless

My thoughts exactly I almost got messed over by paying 130 for my codes and 130 for each code i wanted them to look into

Renderless

This will be my current fix ill be working on until i get the compression test done. But as of right now fan works radiator is good no coolant has been used it hasant bubbled out of the resevoir belts are new as well pump got cleaned but will most likely buy a mew one as well
or rather check it out after the compression test results.

mazdaverx7

iTrader: (6)

Definitely keep us updated on what the dealer advises. Also, you can purchase a rotary compression tester from www.rotarycompressiontester.com and you can do it yourself in the future. I have one and love it!!

How high does the temperature gauge climb? Or are you just thinking it wont start because the engine is too hot and there are no other signs of overheating?

Renderless

Yea it seems like a better go to buy a compression tester online but the dealer is cut out as my dad and “mechanic” urged to avoid it since they see that the engine is fine

The temp gauge doesnt climb and stays a little above halg and even running the car is fine temp wise and the fans do its job so ive been overthinking

Hot start is an issue i got a misfire in cylinder 1
Both o2 sensors and the cat need to be dealt with as its effecting the air fuel mixture and the cat is old

I just seafoamed it last night and it ran great granted iam still new at stick so i felt it fine

my old ignition coils had white spots on top of them so they had to get replaced i think but ever since then (yesterday) it turns on more but it still has hot start issues taking a good while for it to turn on but initial is acceptable

as said it has the remand starter but i might get it a better one and get the battery tested since its 850 cold crank amps which i read on here is the minimum

Renderless

p0301
Cylinder 1 Misfire

p2270
O2 Sensor Signal Stuck
Lean Bank 1 Sensor 2

p2096
Post Catalyst Fuel Trim
System Too Lean Bank 1

are the only codes after running the seafoam clear for a good hour which iam tracing back to just te O2 Sensors, new cat, hopefully just new wires since the spark plugs are new and the ignition coils as well