Alright i've been having troubles starting the car. When it does start after a few cranks i've noticed a large pop sound. Any idea what it could be?

 

did u change spark plugs lately? i heard that when I changed my plugs, and in the end, the plug wires were reversed like the L1 and L2 were switched


check it out, L1 should be the lower of the front rotor near the radiator
L2 should be the one near the firewall

check Trailing also
unlike Pistons, rotary idles rock solid with the wires swapped... so its not easy to find out

 

Alright i'll check that tomorrow cause its dark now and i'm afraid of the dark...hah

 

I think i'll just change them anyways since its been 10000 miles. What brand do you guys usually use?

NGK?

Any special kind?

I tried searching but got tired after the 4th page

 

I like NGK. Mine were only $8.00 each.

 

NGK R's mine were $5.49 a piece from O'Reily's Auto Parts.

 

Ngk

 

what parts numbers or spesc on plugs would you reommend? (think s4 n/a) in other word which ones do i need to pick up?

 

NGK BUR7EQ? for leading
BUR9EQ for trailing

but it might not be the reason for the pop though....
that is what i heard when i had my wires crossed and changed plugs
but never found out what it was.....

the spark plugs in OEM Spec is more than enough for daily use and some performance

if u want u can go Iridium or platinum/gold (i forget which) in NGK, but it is more expensive, and considering that Rotaries EAT plugs like crazy.... 35-40 bucks for a Iridium plug is not really worth it...

i'm planning to get a Crane Hi-6 CDI ignition soon, which many people say will increase gas milleage, improve spark, and make the plugs last longer, so that is a good investment.

if u are running high boost turbo (but u said S4 NA i know =) then i've heard running 9s all the way around makes it smoother in high-end but low end might suffer (thats what i'm running now, BUR9EQ in all four, don't feel much affects in low end)

and there are many info avaliable, but don't use Piston type Plugs....

 

Would average joe stores have them like Pep Boys and Autozone?

 

i heard some do but not always.
i bet those Autolite brand won't have it for RXs (i wouldn't use them if they did )
but i think NGKs are cheaper online

 

autolite does make plugs for rx-7, and you're right about not buying them. just go to kragen.

 

increase gas milleage - yes
improve spark - yes
make the plugs last longer - if they're being replaced because they foul, yes. If it's because they are simply worn out, the MSD function will wear them out sooner.

If you haven't bought yet, you may wish to compare the specs between the Crane and what Mallory/Mr Gasket has to offer.

Just so that this isn't a complete hijack, my car used to occasionally pop on startup. It hasn't since the CD box (capcitive discharge, not the Alpine head unit) was installed.

 

thanks i'll try to get the comparison

anyways, about that pop, i still cannot find what is the reason is that caused my pop. (hope it is not any seals inside the engine itself) but I guess I'll check and advise u to check vaccum hoses, mostly big ones, and i guess check the exhaust pipes to see if anything's up... I checked my vac hoses, and well they were ok... now i need to check my Exhaust system... see if there were any pops (hopefully not the cat )

 

check your timing as well