Bogging out of nowhere?

[Matt D.]

Now that I think of it, right after I got my car it acted weird when leaving a stoplight and died. Took a bit to fire up again, but got the code checked right away and it was a crank angle sensor error. Also, I don't think this problem has happened to me since I got tuned and Scheides helped me play around with the ECU, we may have turned those things off on my car.

[2zzgtte]

Lol, I have no idea where to go with this now.

Is there any way I can test injectors?

[asshanson]

Try disabling the misfire codes in the ECU with a reflash.

[Ronnie S]

Try to pinpoint which cylinder is mis firing for sure. I'm leaning towards cylinder no 1.
You can do it by either unplugging each injector clip or lifting the sparkplug wire or coil on each cylinder.
Once you know which cylinder it is, switch the injector in that cylinder with another cylinder and see if it follows the misfire. If it does then it's your injector.

[Ronnie S]

The test is done while the car is running. You will be listening for a change in how the engine idles. The cylinder that's misfiring is the one that won't change the way it idles.

[Ronnie S]

I have had that exact same problem a few times since I've owned my car (3+ years) and have never been able to figure it out. Only does it on the highway at sustained speed. If you let off the gas it fixes it momentarily, but will usually happen again right away 3-5 times, then will be fine. My check engine light went away later that day or the next.

This is actually a common issue with the evo. There is now a way to flash it to go away.

[2zzgtte]

Try to pinpoint which cylinder is mis firing for sure. I'm leaning towards cylinder no 1.
You can do it by either unplugging each injector clip or lifting the sparkplug wire or coil on each cylinder.
Once you know which cylinder it is, switch the injector in that cylinder with another cylinder and see if it follows the misfire. If it does then it's your injector.

Good idea! I'll do this when I get home. I tried to do this with the coil's and I swear i pin-pointed the issue as a coil issue, but it doesn't seem like I hit the nail on the head.

The test is done while the car is running. You will be listening for a change in how the engine idles. The cylinder that's misfiring is the one that won't change the way it idles.

I have never looked at injectors before. Are they hard to take out and switch?


Try disabling the misfire codes in the ECU with a reflash.
This is actually a common issue with the evo. There is now a way to flash it to go away.

If I was going to flash it, how would I go about doing it? Would I have to bring it somewhere?

[Matt D.]

I have never looked at injectors before. Are they hard to take out and switch?
The plugs are easy to take off, which is all you need to do for this testing. Removal of them requires removing the fuel rail, only a couple of bolts.
If I was going to flash it, how would I go about doing it? Would I have to bring it somewhere?
Any of the local shops can help you out, but hit up Scheides and see if he's available sometime. He's becoming the local freelance Evo ECU flasher. He accepts beer and handjobs as payment.

[2zzgtte]

The plugs are easy to take off, which is all you need to do for this testing. Removal of them requires removing the fuel rail, only a couple of bolts.

Any of the local shops can help you out, but hit up Scheides and see if he's available sometime. He's becoming the local freelance Evo ECU flasher. He accepts beer and handjobs as payment.


Sweet! thanks for all the information! I'm gonna hit Scheides up right now. He was already nice enough to offer me one of his good coils. I'll post up what I find tonight when I get to testing.

The car is drivable, but i am not sure how good it is for the car. I might have to limp it over to him.

If i find that it seems to be an injector, should I replace it? or is there a way to test the injector to see if it is acting goofy and if it needs to be replaced?

[Shane@DBPerformance]

did you pull the code?