Help please - engine troubles

[leon]

Nexto the ABS is the Ignitor wich looks after the coilpacks. did the Apexi show any sensors out?

[topi]

Nah, it just tells me it\'s made by APEXi all the while haha. Pretty damn usefull.

[leon]

Damn thats out of my scope now x.x Don\'t know enough about the Apexi\'s to help. I\'d have thought if you could star the car it would display the usual screens

[topi]

Ah but the car wont start now, just turns over.

Strange thing is, I\'ve tested for a spark many times and sometimes I\'m getting a good spark... sometimes nothing? And now there seems to be no power to the coils?

[lee mills]

try a different ecu

[arrouk]

try changing  your coils and igniter,i had a similar issue and didn\'t check the igniter..............




till i found that was the fault, 3 coil packs later.

also try ecu, but i would be tempted to try the ignition system first just in case it that has caused some damage to your ECU, only one thing worse than damaging your ECU is doing someone else\'s as well.

Matt

[Gatesy]

Sounds strange dude my Apexi loads up as soon as I turn the ignition on.  If it doesn\'t start up until you start the car then perhaps theres your problem.  has it always been like that?

[topi]

To be honest I\'ve never noticed mate, the car\'s always started first time and I\'ve only started looking at the commander when it\'s running.

Hmmm I hope this doesn\'t turn out expensive!

[topi]

Right then!

After having the battery out and on charge over night, it\'s obviously reset the ECU and the PFC commander is operating properly with the ignition switched on.

We managed to fire it up this morning and then it seemed to struggle to fuel and die off. Now when you turn it over, it\'s trying to start but doesn\'t seem to have enough fuel to get going.

It\'s using a Walbro 255LPH Fuel pump, but it doesn\'t seem to be making much noise? Now in other car\'s I\'ve used Walbro\'s and they\'ve been pretty loud. This one makes a slight buzz for a few seconds if you put your ear right too it and then it stops.

Maybe this is my problem?

I\'m gonna try and hook up a fuel pressure guage in the line now to see if the pump is actually pumping anything.

[lee mills]

have a read of link might help
http://www.mazdarotaryclub.com/forums/showthread.php?t=47655

[topi]

Cheers for the link Lee, I\'ll have a good read through.

In the mean time, I hooked up a fuel pressure guage inline at the pump and it\'s only putting out around 2bar. Which I think isn\'t enough.
So I took the fuel pump out and.... as far as I can tell it\'s completely standard. Denso written on the top.

[gsb876]

was it working though dude  ?

I think it deffo sounded like there was no action from the fuel pump as i couldn\'t hear the buzz as you usually get, and upon attempted start up the injector duty was 1.2% which is too low.

At least the PFC was working again :Thumbs-up

[topi]

It was working mate, but I don\'t think it was working enough haha.
 
I\'m gonna speak to Hayward today and see what they think the pump should be behaving like.

[arrouk]

dont forget that at idle there is a resister in the wiring to reduce the flow from the pump, from memory i think the pump gets 5v at idle.

matt

[topi]

Right I spoke to Hayward, they reckon the standard pump is fair reliable and 2bar sounds about right under 4k rpm.
 
So I\'m completely stuck. I\'m about ready to give up and take the car somewhere. Shame I\'m nowhere near any rotary specialists.