Help isolate fuel problem
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? |
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. |
Originally Posted by hustler
(Post 1107317)
If a driver were hung open on the injectors would fuel flow when the car is not running but pump primed?
|
Which car? Green or white?
|
Originally Posted by Reverant
(Post 1107396)
Which car? Green or white?
|
Originally Posted by rleete
(Post 1107344)
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.
|
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. |
Originally Posted by hustler
(Post 1108084)
Could it be screwed up and not working properly, or is this a dead give-away that I have other problems?
Not sure how to check an injector other than removing it and seeing if it's leaking/spraying with the car off. |
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.
|
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. |
Originally Posted by rleete
(Post 1114564)
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. To output test mode I go! |
BTW, it's cool how you can turn-off the fuel pump for test-modes in MS3, balleur as fuck.
Does each injector have it's own driver, or are the drivers shared? |
using injector test mode, all 4 injectors cycle audibly with the same pattern. Is this a reliable method to confirm they are working properly?
|
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?
|
any coolant in cylinder 3?
|
Originally Posted by fooger03
(Post 1114590)
any coolant in cylinder 3?
|
Any recommendations on a spark plug test light that I can shove up my VVT coil for easy confirmation?
|
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. |
Originally Posted by hustler
(Post 1114601)
Any recommendations on a spark plug test light that I can shove up my VVT coil for easy confirmation?
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 ? |
Originally Posted by hustler
(Post 1114601)
Any recommendations on a spark plug test light that I can shove up my VVT coil for easy confirmation?
|
All times are GMT -4. The time now is 06:42 AM. |
© 2024 MH Sub I, LLC dba Internet Brands