Yeah, will do it very soon, Secondly, is there any way to check cranking rpm without the rotary compression tools?

 

Yes, you can use an OBD scan tool solution.

 

Well, i have OBD2 scanner and torque pro app but can't find any option in it for crank speed. Sorry, new to OBD2 thingy

 

It's under the Engine RPM. Thats what you are measuring.

 

I tested engine cranking rpm ( Gas pedal to floor and cranking) RPM display started at 220 and ended at 252 During a HOT start. So does that mean that this reading will be lower at COLD and can cause delayed starting? and should i check it on Cold too? Thanks

 

During a few cranks a solid S1 starter should do about 3 cranks at 250RPM (S2 starter is at 295-300+ RPM) before is starts to drop down as the battery drains. Did you load test your battery yet?

 

Okay, will do the cranking speed test on cold and see if at 3 cranks it shows 250rpm. If it does not then will buy S2 starter.

I have tested the battery when engine was warm and turned off and it was showing 12.50v. While starting it gave 14v.

I have yet to test the battery when the car is parked overnight and Cold.

 

Yeah but you can have a bad battery that is still showing 12+V. A load test is needed to determine the real condition of the battery. But the S2 starter is great, I love it.

And now you can get one for half of what i paid for mine.


You can see the physical differences here. The S2 starter is on the left.

 

can you please give me a procedure for load testing rx8 car battery?

 

Buy one of these

 

wao, thanks

 

Well battery turned out fine under load. Also one major symptom. At COLD, i cranked ( gas peddle to floor method) few seconds, then turned off the switch, turned it on and then cranked again and it fired right up. What now?

 

Did you ever check fuel pressure? Check your fuel pump relay (swap it with another blue one) or replace it ($11.00 at Oreulliys), I just had a similar symptom and it was a finicky fuel pump relay.

 

Yup, Checked fuel pressure and its 57psi. I will Swap fuel pump relay and will let you know the result. If things still persist then i think its the battery because the starter is giving different cranking speed on cold and hot 1.e 160 - 180 on cold and 240 - 250 on Hot

 

When did you check pressure though? When it was cold or after you started cranking on it? I have a fuel pressure gauge but so I noticed it quick but when I would get into the car when it was cold it would only be 30psi. After on crank it would prime to the normal 60psi. And sometimes it would be fine, so the relay was working sometimes.

 

it was checked when car was running and on idle ( Fuel guage pipes inserted before the start). Should i recheck the pressure by testing it while cranking too?

 

Yes test it cold with just the key turned on, before cranking at all.

 

Same here, At cold with just key turned on, pressure is 32psi and after cranking and starting 57Psi

 

Well there you go.

 

So it means that either to change the fuel pump/ Relay or just live with this minor annoyance at cold..
No emergency to replace it... right?

 

Unless there is a fuel leak somewhere and it is leaking and causing the line to lose pressure while it sits. Can you afford to lose the car to a fire?

 

Will check the fuel line for any minor leaks for sure now

 

Well you got this right. Fuel pipe was leaking in the engine bay right behind the Air box. Leaking was minor but i think it was enough to lose fuel pressure overnight. Thanks for pointing me in right direction and to solve this problem for me.

No more long cold starts now...yayyyy

 

Awesome, glad you got this sorted man.

 

So this is for the occasional long crank when cold... but what about when hot? Just like the OP, about 1/20 times my car would take about 2-2.5 seconds to start. It feels as if it's not getting fuel for the first second, and then starts up immediately.

I wonder if the OP found a solution.