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[willo]

can anyone school me on this? The TJ is really lumpy and sounds like it is running on 5, anyone know what the black canister does on what looks like the return? its after what looks like a solenoid... will look for pics

[willo]

I know this is a v8 but its the black unit behind the washer bottle:

https://www.google.co.uk/search?q=jeep+tj+engine+bay&hl=en&source=lnms&tbm=isch&sa=X&ei=PaqOUaT-CIjXPMWtgKAJ&ved=0CAcQ_AUoAQ&biw=1287&bih=707#imgrc=3xtPSj3t7dpBZM%3A%3BPmcrRuG7A2L2-M%3Bhttp%253A%252F%252Fnas6f.freewebspace.com%252Fimages%252Fengine_bay_current.jpg%3Bhttp%253A%252F%252Fwww.jeepsunlimited.com%252Fforums%252Fshowthread.php%253Ft%253D176058%3B576%3B435

[JamesH]

I guess it's the same as my XJ-. The black canister is a charcoal canister for fuel vapour.. the solenoid opens to release these vapours into the intake manifold from time to time. All computer controlled for emissions and fuel economy!

Sent from my MZ604 using Tapatalk HD

[willo]

Thanks, ok, maybe not that then

[JamesH]

Check for leaks or holes in the vacuum system. I had a hole in a 90deg connector to the intake manifold where it contacted a hose going to the heater matrix. Years of vibrations must have worn the hole in it and when it got really hot under the bonnet the engine would get really lumpy and misfire. Not 100% sure this was the total cause but can't have helped.

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[JamesH]

Is it when the engine is hot? Not necessarily coolant temp but hot under the bonnet? Is it a 98 model? I have read stuff about heat soak causing injectors 3 & 4 vaporising fuel. BUT this may be internet BS, I was searching for answers when mine was being awkward and I'm not 100% it's sorted now - have been concentrating on other stuff lately.

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[Delk]

It's because you washed it