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Can anyone take a stab at what's going on with my evo?
I recently had it tuned a few months back for E85/NEW FIC injectors and a new Walbro fuel pump that I recently installed.
I drove it home after it was tuned without a hiccup. It's sat in my garage ever since. A month ago, I was going to move my evo and back it into my garage to free up a little space and it did the same thing as shown I the video.
The car runs extremely rough, whole engine seems to vibrate at idle and with revs. Car wants to die when you let off the gas. Afr goes super lean after a few seconds of idling. Thoughts?
What I've looked at so far:
Plugs - They look exactly like this:
I threw on another set of coils/wires and I still get the same issue after start up.
I also tested the injector resistor box and that checks out just fine.
Anyone else have any bright ideas? I took all of the injectors out and there isn't a single particle of buildup since these were new injectors and have only had 1/2 tank of Ethanol ran through them. Should I just get the injectors tested? Possibly a bad ECU? There's absolutely no check engine codes/lights either.
You're not suppose to let car sit with E85. I did this to my car too and found out the hard way. Do a cold compression test (unless you can somehow warm up your engine). My cylinder #3 had leaking intake valve and let compression push air/fuel mixture into intake manifold. And my engine sounded like a WRX.
The picture is actually reversed. It's 4 - 1. So the plugs that look good are the cylinders that aren't under the OEM coils.
Originally Posted by 2006EvoIXer
You're not suppose to let car sit with E85. I did this to my car too and found out the hard way. Do a cold compression test (unless you can somehow warm up your engine). My cylinder #3 had leaking intake valve and let compression push air/fuel mixture into intake manifold. And my engine sounded like a WRX.
Well after 7 years of running ethanol in 3 different cars (2 evos and a supra), I've NEVER had an issue with the cars sitting for long periods of time, while running ethanol. I've never had any of the black gunk build up on my injector tips either. Just a FYI.
The only other thing I can think of is I did replace the throttle body shaft seals and cleaned the backside of the throttle plate. It seems odd that would have any effect on why it's specifically two cylinders that are either not firing or getting flooded with fuel...
You can try boost leak test but throttle body seals shouldn't cause 2 cylinders to not run. If you cleaned off the black stuff on back of throttle plate and walls of throttle body, you just caused high idle. But that's not your current problem.
I had this problem twice; first I simply replace my ignition wire. I would touched the wire and all sudden it would run on 4 cyclinder so I replace it (COP). Second I had to let the car warm up it enough and everything was fine after that, during a cold day.
So we foundthat 2 cylinders are NOT getting fuel. I swapped the #2 & 3 injectors around to make sure it wasn't an injector problem and it's still the same two cylinders not getting fuel.
It's the #1 & 3 cylinders that aren't getting fuel at all.
use a voltmeter to check 2 & 4 power 12V. Then check 1 & 3 to see if it's there. I think the ECU uses ground to trigger. Make sure ignition is in on position for test.
If you have to disconnect injectors, make sure not to lose the metal clip.
If no power, then you need to follow it to find the break. If there is power, then check wire continuity from injector plug to ecu pins 1 & 24 (if you have a IX).
Last edited by 2006EvoIXer; Apr 29, 2018 at 07:59 PM.
use a voltmeter to check 2 & 4 power 12V. Then check 1 & 3 to see if it's there. I think the ECU uses ground to trigger. Make sure ignition is in on position for test.
If you have to disconnect injectors, make sure not to lose the metal clip.
If no power, then you need to follow it to find the break. If there is power, then check wire continuity from injector plug to ecu pins 1 & 24 (if you have a IX).
I'll double check each of the injector clips tonight then. Unfortunately, I have a VIII, not an IX.
Apr 21, 2018, 06:07 PM
