Be sure to check out all 4 videos in this series to watch me diagnose this misfire issue:
Episode 1: https://youtu.be/tQCg-jDuzlc
Episode 2: https://youtu.be/wVrNO9e31ak
Episode 3: https://youtu.be/Vwcqh5WTbPI
Episode 4: https://youtu.be/hMwj_uvHFpY
Explained in prior videos but to summarize: Jeep was throwing cylinder 3 misfire and rough idling + stuttering with slow acceleration, normal at higher RPM. Here is everything that has been done:
Compression test – all normal
Leak down test – all normal
Replaced coil – no difference
Replaced plugs – no difference
Replaced fuel injectors – no difference
Did fuel rail test: normalish
Noid light test – normal
Replaced cam position, throttle position, and intake charge air temp sensors – no change
Placed insulation on cylinder 3 in case its heat soak – no difference
Now throwing cylinder 1 misfire. I appreciate all help. What should i try next? Replace spark plugs (even though gap is fine + they are 5k miles old?) Replace o2 sensors? Map sensor? Thank you so much!
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Please need help
What fixed it I have same problem
Do you have a part number for the original oem hose that you replaced? Mine recently cracked and I haven't been able to find it anywhere
It’s your intake /exhaust Gasket leak . For that miss-fire .
Is that the original motor in the jeep with 260,000 miles
Had the same problem it was bad connection in the ecm plugs
Ok here are some things to do. Simple stuff first.
1. Swap spark plugs 2 and 3. Check to see if misfire moves to cylinder 2. If it does, bad spark plug.
2. Put a multimeter on injectors. See if #3 doesn't match ohms for the rest. If it doesn't. Then bad injector.
3. Swap injector 3 and 2. If misfire moves to the other cylinder. Bad or plugged injector. If it doesn't, possible plug in fuel rail to number 3.
Have you checked spark?
And fuel?
That hose wont work. It will collapse on itself when hot. Get at least the reinforced blue stuff
Have you changed spark plugs, cleaned out the throttle body? BTW the clear hose isn't going to cut it for the breather, it'll get hot and end up distorting, use some automotive hose.