When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
yeah i want to say this is maybe ignition, if not the coils themselves, but the CAS or the pulley slipped, or cold solder joints that failed on the ignition outputs?
1. Timing marks all line up perfect at TDC. I made a mark on my CAS too in relation to the head so i know that hasn't shifted at all since the car was tuned.
2. I've tested a second set of coils, nothing improved.
3. All plugs have like less than 10 miles on them this week. They already are showing signs of rich conditions...#2 being a bit wetter looking than the rest albeit not horrible. 1-4 left to right. 1 appears least amount of carbon buildup.
But when he pulled cylinder 1 coil the engine didn't run any better.
I say either dead injector 1, or something in the harness. CAS shouldn't **** up a single cylinder like that.
So you're sounding confident its either injector or injector harness. What would trigger the lost sync reason 38 though? That being a CAS reason, unless when it's not getting fuel and causing the cylinder to not be firing its causing the CAS send whacky signals? I don't know what the relation is there to guess on that one.
I appreciate the input so far guys, keep em coming. I sourced a used CAS for a good deal and it's on its way in case i end up needing it.
Anyone have the proper settings to use for injector testing each cylinder at a time? Also amount and duration? I don't want to dump unneccesary amounts of fuel in there.
Should i pull plugs during that test as well?
If all injectors are clicking in the test, then I planned on pulling the rail and doing the test again to check visual flow. Or just moving injector #1 to another cylinder and seeing if the wire pull trick follows the injector.
So tonight I ran the injector test. First i just unplugged the fuel pump relay and ran the test one injector at a time, and they all were clicking as i tested them.
For both no fuel/with fuel i used the default injector test settings (image attached). I took this screenshot when i got home tonight without having the car keyed on or my laptop hooked up to the ecu...so i'm assuming none of these values change when that's the case. I tested ONE injector at a time. The way my sequential is set up, INJ 4 D = cylinder 1, INJ 1 = cylinder 2, INJ 2 = cylinder 3, INJ 3 C = cylinder 4. I don't have my ecu in front of me but pretty sure the two new signal wires that were added feed INJ 2 for cylinder 3 and INJ 3 for cylinder 4. (Braineack setup, he can confirm this).
So i pulled the rail out with the injectors in them and had two of my buddies hold them in by hand. Ran the test again with the fuel pump on. They could barely hold them in the rail but not much fuel was coming out of each injector as i individually tested them (im assuming this was due to the default test settings used. It was just kind of slowly shooting out a little bit at a time).
Injector two, however, now showed NO response to a test. No clicking, no fuel, NOTHING. This was really confusing because I was hoping/expecting to see this happen on cylinder one...since when it was idling yesterday and we pulled plug wires one at a time, pulling wire #1 all the way out didnt seem to affect the idle of the car at all.....2/3/4 did.
So, stumped, we swapped injectors 1 & 2. NOT the pigtails, just the injectors.
Ran the test again, and all 4 injectors responded to the test and spritzed the same amount of fuel. We checked this several times.
So we switched 1 & 2 injectors back around, again NOT the pigtails, and tested. All 4 injectors worked again.
What the heck? We didn't really grab ahold of the injector harness and shake it or anything, all we really did between #2 injector not working and #2 working was unplug the pigtail from the INJECTOR (not the harness) move it, tested it working, and moved it back.
My plan was to put it all back together....leaving the injectors in the same positions as we've had them all along and now tested all clicking and spraying fuel, but alas during testing (def occurred during testing removal) one of the small upper o rings broke so tomorrow I'll go get a replacement.
If it starts and idles good, then we'll see how long it lasts. If it starts and idles POORLY, i'll start wiggling the injector harness around and seeing what happens. If that fixes the idle, then I'll shift my focus to redoing the sequential harness. If that DOESN'T fix it....possible the injectors are intermittent? Faulty pigtail? It's odd that they all clicked when dry firing through several tests, then added fuel pressure and #2 wouldn't do anything for several tests, switched 1 & 2 around and all 4 clicking again and spraying fuel through several tests, switch 1 & 2 back and through several tests they all work again.
you can always test the signal at the harness itself and determine if it's the ECUs fault it's not firing (bad injector driver) or the injector itself is failing to react.
it's a constant 12v supply at the connector and then the signal form the ms just rapidly grounds. So you could just probe the ground from the MS in diode mode, put the other lead to ground, and listen to the pulses. If #2 is not firing in test mode, but then you unplug and test the signal with your DMM and it's coming through the harness, then you have a pretty good idea it's a bad injector or not.
you can always test the signal at the harness itself and determine if it's the ECUs fault it's not firing (bad injector driver) or the injector itself is failing to react.
it's a constant 12v supply at the connector and then the signal form the ms just rapidly grounds. So you could just probe the ground from the MS in diode mode, put the other lead to ground, and listen to the pulses. If #2 is not firing in test mode, but then you unplug and test the signal with your DMM and it's coming through the harness, then you have a pretty good idea it's a bad injector or not.
I'm having a hard time visualizing the test setup you described after reading through that Brain. Use both leads from a volt meter at the pigtail itself, ground probe to ground and hot probe to signal? Then run the same injector test and watch to see 12v, drop, 12v, drop, 12v, drop, etc?
Like i said, it's weird that doing the injector test without fuel made all the injectors click perfectly fine. Then the first few tests with fuel #2 became unresponsive. Then they all started working again after moving a few injectors back and forth.
04-24-2017, 05:25 PM
1
