confiem Fuel Delivery-Rebuilt engine NA6

manga_blue · Postby **manga_blue** » Mon Jun 06, 2011 1:06 pm

I'm just wondering what happens to injectors that have been sitting around doing nothing for 12 months? It does sound like you have fuel at the tops of the injectors, just not spraying at the bottoms.

It really pisses you off, doesn't it, when you've done all that hard work on a rebuild and some trivial bloody thing is stopping you from appreciating it all. :evil:

Postby **NitroDann** » Mon Jun 06, 2011 1:14 pm

I might point out that old injectors can get stuck, ie the pintle gets jammed. Take one out, then look at the tip it will have a small needle like tip just pointing out, if you gently push this on a hard surface it should pop in and out easily with a small amount of force, but if its jammed it wont.

Try taking one out and pushing it gently but firmly against something hard, if it doesnt push in and out push harder until it frees itself. You wont break it so dont stress when you do it.

Dann

Steampunk · Postby **Steampunk** » Mon Jun 06, 2011 4:30 pm

OK, so fuel pump IS working and you had fuel squirt out the top of a leaky injector right?
have you considered swapping injectors around and use the ones from your old engine? At least you know they work, and can rule them out of the equation if you still dont get fuel into the engine.

Dweezle · Postby **Dweezle** » Mon Jun 06, 2011 4:57 pm

It kind of has a mix up of injectors now.

2 of the little ceramic/plastic ends where cracked on the original injectors so i have used 2 from the old engine to replace those.
Then one of the injectors, not sure if it was original engine or rebuilt engine, leaked so just used a unbroken injector.

I have a place ready for me to take the injectors to tomorrow to see if they can check/clean and give me new o-rings insulators etc etc...

tbro · Postby **tbro** » Mon Jun 06, 2011 5:51 pm

Hey Mark,
Just a dumb arse question, but you haven't mixed the two fuel line around have you???

Check earth at r/h rear of engine?

Is there fuel in the tank????

Can you hear the pump working?

Have you sworn a lot ? (helps Heaps)

Ring or Pm if need be

Terry

jerrah · Postby **jerrah** » Mon Jun 06, 2011 8:38 pm

Made that mistake once (fuel lines backwards) fuel to the rail but nothing to the injectors...

Dweezle · Postby **Dweezle** » Mon Jun 06, 2011 10:37 pm

Ok.. some success.. sort of

Engine ran straight away with AEROSTART. So confirmed no fuel.
Pulled injectors, checked Ohm. all at 14ohm. So thats fine.

Decided to try a 9 volt battery upto them.

Only 1 clicked, All the rest did nothing.
It was the Only 1 in the engine thats been running. The other 3 where just sitting around for who knows how long in the engine that was rebuilt... a few years.
So they willl all be delivered somewhere for cleaning and testing tomorrow.

Cant thank all you enoough for your help.

Can not wait to get this beast going.

Will post a vid if all works out !!!!

Postby **NitroDann** » Mon Jun 06, 2011 11:18 pm

did you free the pintles like I said? It should fix them for free.

Dann

Dweezle · Postby **Dweezle** » Mon Jun 06, 2011 11:26 pm

I was going to Dan, but after having 3 other injectors with broken plastic covers I am worried I might damage something.
I don't have any spare if it does break..

I assume getting them cleaned and flow tested should make sure everything is 100% which would be nice with the new engine.

Postby **NitroDann** » Mon Jun 06, 2011 11:31 pm

Pintle covers (the plastic bits) are usually broken when you get them out due to them being heat cycled, they are suuuuper cheap and they pull off with your fingers or some pliers, just pull them off, push down the pintles buy new caps and save 120 dollars?

Dann

manga_blue · Postby **manga_blue** » Mon Jun 06, 2011 11:38 pm

Things have moved on a bit since the single hole pintle injectors of 1989. Have a search for later style injectors of similar volume - there's a big injector comparison list somewhere on miata.net. They spray better and are more accurate and more reliable. Good injectors might be cheaper than cleaning and they'll give a return in better economy and smoother low speed running. You can use your working set in the meantime until you find what you want.

Dweezle · Postby **Dweezle** » Tue Jun 07, 2011 7:48 am

I do not have a working set? Well my Malibu does but that ain't happening haha .

From my internet searching the pintle caps are there to create the proper spray from the injector??

The car is being setup for 2a supersprints.
I will have to check the regs as i am unsure If i can change injectors.

Dweezle · Postby **Dweezle** » Wed Jun 08, 2011 11:51 am

Confirmed 3 injectors where jammed with a 9 volt battery.
Dropped off injectors to chatswood brake and clutch.
picked up clean injectors with all new pintle caps, o-rings, filters and spray patterns correct.
Plugged into fuel rail.
Primed system.
Turn key.

YAHTZEE !!!!!!!!!!!!!!!!!

THANKS FOR EVERYONES HELP.