Caz2313

(Solved)
Ecu was having a hard time adjusting to ls coils! Used versatune to tune it Set it up for ls coils, and set my idle at 1150 and it has never ran better built off of one of the existing tunes

I know theres a few dozen posts on this but none are exactly what im experiencing. i changes the spark plugs about a month ago, ran some fuel cleaner through it.​​​​​​​a couple days ago i changed the coil packs and went with the npboosted ls coil packs from their website, also put in a new cold air intake, the other one had a crack in it so i swapped it out, also replaced the coa filter with a brand new one, did an oil change and oil filter, was running w20 in it so thats what i put in it, car was stalling when hot after all that but restarts fine, figured maybe the old oil was thicker from not being changed in god knows how long (previous owner) and that maybe the new oil was a little too thin, drained the oil and put in 10w40 and it runs alot better but still stalls from time to time, about 2 times on long drives, now i dont know where to start.i checked all the fittings for coa and there all tight and sealeddoesnt have a missfireand the only codes are for the secondary air pump and air pump solenoid(removed air pump since i am catless) It idles at 900-800 but will dip down to 500 from time to time then stall, and 85% of the time it will start back up fine, other 15 it wont and i have to wait a few minutes for it to cool down then it will start back up im currently thinking of getting versatuner and upping the idle speed tables to 1200 to help avoid the dipping, so you think that will help with the stall? If i hold it at about 1200-1500 it never stalls any help will be appreciated, she sits a little short of 170000 miles​​​​​​​

r3mix

Edited out because none of it is applicable

Caz2313

No the solenoid just sends air into the secondary pump to turn the valve open on cold starts to prevent the cat from getting overheated, since i dont have a cat its not an issue and many people who run catless take the pump out which ive already done, the secondary pump doesnt have any effect on idle, my best bet is the ecu is having trouble adjusting to the ls coils but that is just a guess since i havent seen anything like this from people who have done the ls coil swap i may just bite the bullet and take it to a mazda tuner and see what they think, im not positive that upping the idle will solve the problem but i do know that if i hold the pedel at 1200-1500 it wont die and thanks for the input man! I love the rx8 but damn is it a finicky sob

Loki

iTrader: (1)

What cold air intake do you have? If it's not AEM or Racing Beat (or stock) it's a likely source of problems.

Not being able to restart until it cools down is a compression symptom though. So... how is yours?

Upping the idle will just mask the problem not fix it .

Loki

iTrader: (1)

None of this is applicable.

Brettus

iTrader: (2)

My bet is on the "cold air intake" .... if you have a stock intake , put that back in and problem will probably disappear with the probable added bonus of more power
If that doesn't work swap the OEM coils back in.

Caz2313

Im running a coa from np boosted as well it was 350 bucks, it had a coa in it when i got it from previous owner, but one of the pieces had a crack in it (it was plastic) so i got a metal coa from npboosted​​​​​​​ and i used a k&n cone filter instead of the one that came with it

Compression is unknown, i definitely need to get it checked, closest rotary shop to me is about an hour away, and if im gonna take to anyone id rather take it to a specialist​​​​​​​

Caz2313

its had a cold air intake in it since the day i got it and it was never a problem, i swapped it out because it was cheap and plastic the one i picked up was from npboosted and is aluminum.

as for the coils i could have just gotten a bad one i guess, but im not showing any signs of a missfire, no pops of flashing cel, but i didnt cheap out and get an ebay kit i got a 400$ kit from npboosted, this weekend ill pull em and test em to see if they produce a spark or not!

Caz2313

Heres pictures of everything installed

Loki

iTrader: (1)

Well if you do have the OE airbox I would give it a shot. The problem with most intakes is they don't straighten the airflow for the MAF sufficiently, causing idle instability and poor drivability. Tours doesn't look too bad, seems like am AEM knockoff, but I wouldn't rule it out. What's happening with the vacuum hoses that attach to the intake after the MAF.

Do you have an OBD reader with which to check fuel trims?

Caz2313

​​​​​​​i dont have an oem box sadly, and the vacuum hose has been caped off​​​​​​​​​​​​​​and no my reader will just relay codes, it doesnt check fuel trims or anything like that! But i could pick one up today!

Loki

iTrader: (1)

Uh, "the vacuum hose"? There should be 3. And none of them should be capped. Do you mean the VFAD actuator hose? That would make sense, but do you have a better picture of the hose connections before the throttle body?

Caz2313

Oh yeah all three of those hoses are connected and held on with worm clamps i though you ment the skinny one that runs behind the throttle body into the manifold

eves405

What fuel trim readings would be normal at idle?

Brettus

iTrader: (2)

On a stock intake it LTFT should stay within plus or minus 4 . Much more than that and you probably have ..................... issues.

eves405

Thanks Brettus!
I will try to plug in the OBDII reader and take a look at the fuel trims.