hustler

iTrader: (6)

So #3's plug is wet, car runs like its on three cylinders, and it's getting spark. How should I go about isolating this problem to the injector or the computer?

Back in November I was at the track and the fuel pump decided not to prime. I jacked with it for hours, then it magically worked and has worked since. However, it's basically run on three cylinders ever since. I have no idea what's going on but now my arm is finally strong enough to turn a wrench so I can work on it.

If a driver were hung open on the injectors would fuel flow when the car is not running but pump primed?

hornetball

iTrader: (4)

If you're not running sequential, it seems like you could swap injectors between the cylinders and injector harness plug between cylinders. I remember reading a JP write-up on how the MS injector firing worked somewhere. If you can do this, see if it follows the injector or the harness plug??

Just thinking out loud, BTW. There's probably a better way.

rleete

iTrader: (21)

If you had a stuck injector, it could do anything from full on spray to just weeping. If the pump is primed, the system should have some pressure.

Reverant

iTrader: (10)

Which car? Green or white?

hustler

iTrader: (6)

Green.

hustler

iTrader: (6)

Could it be screwed up and not working properly, or is this a dead give-away that I have other problems?

Reverant

iTrader: (10)

Remove injectors, replace them with automotive 5-15W light bulbs.

The bulbs should be glowing about the same when you crank. All should be off when not cranking.

rleete

iTrader: (21)

I don't know. But that's the first thing I would check. I like Reverant's idea of using bulbs to test the connections.

Not sure how to check an injector other than removing it and seeing if it's leaking/spraying with the car off.

hustler

iTrader: (6)

Is there any reason why the plug would fire outside of the engine, but not when screwed in? I'm a little confused right now, something is not right but I can't tell what or why when using a multi-meter. I guess it's time for the lights.

rleete

iTrader: (21)

Not unless the wire is borked. If there's a break, putting the plug in may open up the break, but it's in contact when the plug is pulled out.

I'd test the wire for continuity.

hustler

iTrader: (6)

Plug wires have continuity, plugs 2&3 do not reek of fuel. 1&4 are clearly burning fuel. I swapped coils (I have a new pair) and no change. Now I guess it's time to see if the injectors are seeing any voltage.

To output test mode I go!

hustler

iTrader: (6)

BTW, it's cool how you can turn-off the fuel pump for test-modes in MS3, balleur as ****.

Does each injector have it's own driver, or are the drivers shared?

hustler

iTrader: (6)

using injector test mode, all 4 injectors cycle audibly with the same pattern. Is this a reliable method to confirm they are working properly?

hustler

iTrader: (6)

When I test the coils I see .5v on coil A (#1/4), .2v on coil B (2/3) measuring both at the OEM connector, coils obviously unplugged since I'm not talking about electrical shock. Thoughts?

fooger03

iTrader: (2)

any coolant in cylinder 3?

hustler

iTrader: (6)

It doesn't appear, but the piston crowns are wet. I'm leaning toward a coil issue. I can swap coils around between old and new, #2&3 never seem to fire. I guess it's the wiring?

hustler

iTrader: (6)

Any recommendations on a spark plug test light that I can shove up my VVT coil for easy confirmation?

Reverant

iTrader: (10)

Injectors 1 and 3 share the same driver on a 1.6L. The same goes for 2 and 4.

So if this was an injector driver inside the ECU, two cylinders would be affected at the same time.

Boris

iTrader: (1)

A grounded out spark plug will tell you if you have fire.

Pull out all the plugs, disconnect your coils and turn on your fuel pump.
When you crank, do you a see any extra fuel or a mist of fuel coming out of the affected cylinder ?

Oscar

iTrader: (2)

Finger on coil and output test mode