Rough Running After Injector Replacement
- Thread starter Iceaxe
- Start date
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set your VOM to continuity and place your leads on the pins of the injector.
Just as landtank described. If you know the 'model/type' of Bosch injector, we can look up the resistance spec for it, but it will probably fall within 13 to 16 Ohm's (if good). Alternately, you can just check ALL of them and use the average. IF any are significantly different, then we may have found the problem.
Be sure and clear any DTC's (codes) before you fire it back up.
We are narrowing it down now, good work.
Fron reading other posts you had running issues prior to installing these injectors. Was that after your meth injection setup or prior to that mod?
- Thread starter
- #26
landtank, yes, had cooling issues. Still do. On that front, my next step will be to get a snorkel and revise the exhaust / see what the o2 sensors are doing. But that was a bit different than what I was dealing with here...
So, this morning I did test the current to the injector, which was good. Also test the vacuum readings on the engine, which was a consistent 17 mm Hg. Then re-listened to all of the injectors and noticed a *slight* decrease in noise level from the 5th injector. As I backed by hand out, accidentally tapped the cable going to the injector and noticed the engine stuttered. Grabbed the cable and manipulated it, and the engine stuttered again. Then tugged on the cable and the new cable slid super-easily out of the connector with the engine harness. Well, hell. This was the culprit after all- turns out the new / old linkage required a substantial amount of force to not only push them together but to click the lock (much more so than the other ones I did). No idea how I missed it, but there it is.
Explains why the issue came and went and then persisted. Ran the rig hard (red-lined it) up the hills, and no codes. Crossing fingers that it truly was something that dumb causing the 5th cylinder to misfire....
So, this morning I did test the current to the injector, which was good. Also test the vacuum readings on the engine, which was a consistent 17 mm Hg. Then re-listened to all of the injectors and noticed a *slight* decrease in noise level from the 5th injector. As I backed by hand out, accidentally tapped the cable going to the injector and noticed the engine stuttered. Grabbed the cable and manipulated it, and the engine stuttered again. Then tugged on the cable and the new cable slid super-easily out of the connector with the engine harness. Well, hell. This was the culprit after all- turns out the new / old linkage required a substantial amount of force to not only push them together but to click the lock (much more so than the other ones I did). No idea how I missed it, but there it is.
Explains why the issue came and went and then persisted. Ran the rig hard (red-lined it) up the hills, and no codes. Crossing fingers that it truly was something that dumb causing the 5th cylinder to misfire....
Glad you found it. Always check the simple things first:
From post #15: "Since you have adapter harnesses....you'll want to check and see that you have a good connection (and voltage) on cylinder #5."
Sounds like you've got it straightened out now. Good job.
Flint.
From post #15: "Since you have adapter harnesses....you'll want to check and see that you have a good connection (and voltage) on cylinder #5."
Sounds like you've got it straightened out now. Good job.
Flint.
My suspicion is that heat is somehow affecting your harness repairs, or perhaps a melted area that you failed to repair, and causing an intermittent misfire of that injector.
Changing the fuel filter is a one banana job because there is only on way to I connect the in and out fuel lines. Toyota was ahead of you on that one. And having a double washer/gasket on one side of the banjo fitting isn't going to cause problems other then maybe a leak.
Changing the fuel filter is a one banana job because there is only on way to I connect the in and out fuel lines. Toyota was ahead of you on that one. And having a double washer/gasket on one side of the banjo fitting isn't going to cause problems other then maybe a leak.
- Thread starter
- #29
^ thanks for that input baldilocks. I will definitely be tearing apart the harness / loom if this issue returns. In the meantime, I'm going to hammer the rig around town on hills to see if it throws that code again.
flintknapper, I would say to anyone that changes out these injectors is to maybe push harder than you think until you hear a definite *click* before calling it good. I had gone back through these connections before and did notice that 5th connector was stiff / tight... but failed to apply enough force to fully lock it in with an audible click.
flintknapper, I would say to anyone that changes out these injectors is to maybe push harder than you think until you hear a definite *click* before calling it good. I had gone back through these connections before and did notice that 5th connector was stiff / tight... but failed to apply enough force to fully lock it in with an audible click.
- Thread starter
- #31
Yeah I know man! I was DREADING this adventure, because it could have meant I had a real mess on my hands (not to mention a THIRD tear down of that intake...).....
After you've driven it for a while, please post a follow up driveability report/any changes you notice such as cold start/hot start/warm up/throttle sensitivity/fuel consumption changes. Thanks!
Easy to do partner, not to worry. Pretty sure you've found your problem, if not....let us know.
I like to use a small dab of dielectric grease on all connections as well (helps to prevent moisture from getting into the connector or corrosion from starting).
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- Thread starter
- #34
Absolutely / will do. Planning a long two week trip with it soon.
glad you got it figured out. Did you get your injectors flow matched before installing?
Just because they are 'new injectors' doesn't mean they all have a good pattern and flow the same. In fact I've see new injectors perform worse than old OEM units.
Flow matching, cleaning and refurbishing my OEM injectors certainly added some grunt to my old trail snail.
Just because they are 'new injectors' doesn't mean they all have a good pattern and flow the same. In fact I've see new injectors perform worse than old OEM units.
Flow matching, cleaning and refurbishing my OEM injectors certainly added some grunt to my old trail snail.
Are the injectors still working well for you? Any benefits would you say? Apart from the issue with the connector, would you still install them as opposed to stock rebuilt injectors if you had to do it over again?
What injectors did you use? Any links please? I've got Fzj80 with 1fzfe.Just to close out this thread, here's what I learned from this experience:
- 'Mud members are awesome. Thanks guys.
- The Bosch injectors not only work, but they do seem to give the engine more "umph". Yes, they are loud, but I can't really hear them in the cabin.
- I haven't thrown a code since that second day / second tear down. No idea what was going on, but everything is ok now.
- Oddly, I've noticed heat management has actually improved. Running consistently 10 degrees cooler... (I've been picking at my overheating issues since installing my SC a year or so ago...).
The OP added a link in post #12
That was over 5 years ago…….
Here are the injectors I installed
Fuel Injector Upgrade Kit 4 Hole Bosch Modern type For 93-97 [23209-74080-Upgrade] - $199.00 : CruiserParts.net, Toyota Landcruiser Parts