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Dirty injectors possibly?
Find a shop that carries BG products and get a can of 44K from them. Add the entire contents of te can to a full tank of gas. Drive til almost empty.

 

That's what I was thinking. I just ordered a set of the 703 dodge neon injectors. I've been wanting to do this upgrade for awhile so I'll find out this week when they come in.

In my searches I found a 4.0L wrangler that said he had the same problem and it was a plugged injector? I'm not sure how an injector can fail just when the engine is hot. But it wouldn't be the strangest thing I've seen.

If the injectors don't fix it I have no idea what to do next. Start re-replacing stuff???? hahahaha that will be fun.

 

so was a dirty injector the answer to your problems?

 

Sorry I forgot to post after I installed them. Yes it fixed the rough idle when the motor got warm. I still get a little stumble when I go offroading and turn it off for 5 minutes and then start it. But I think that is from heat soak.

I installed the 703 neon injectors fyi

 

Thanks for this update I'm having the same annoying rough idle when warm. I've already changed out the TPS and IAC and cleaned the throttle body with no real difference. It's frustrating because when cool it idles perfectly but as soon as it hits 205, it's low (550 or so) and sends an annoying vibration from the muffler/catalytic converter area.

My next thought was forward O2 sensor but looks like I'll get a set of injectors instead.

 

I would change the O2 sensor and do a crankshaft sensor. When the crank sensor starts to fail heat effects it and causes rough idle. They are notorious to fail. Its on top of the transmission bell housing and isn't to bad to change.

My friends started failing and it wouldn't start after the engine warmed up. We poured water on the sensor to cool it off and it started right up.

 

I may change the O2 sensor first before the injectors. A lot cheaper. Didn't realize how expensive the injectors are. Gonna pick one up tonight and I'll update.

 

Look on eBay. There was a guy selling brand new injectors for $20-$25 a piece. The been injector have a better spray pattern so you get better mpg's.

I bought mine from him and IMO I think they were worth every penny. You could make that money back on the fuel savings alone. Not many parts will pay for themselves. I can get you the sellers name if you want.

 

I would like the sellers name. I've been thinking about doing this upgrade this spring.

 

Why wouldn't you have a thermostat installed?

 

JEEP Upgrade Fuel Injectors Bosch 0280155703 MOPAR 05277739A

Is the description
Sellers name is djd16

The previous owner replaced the water pump and didn't put one in. The reasoning behind it is you don't have to wait for the thermostat to open for the coolant to flow and cool the engine. Its dumb and shouldn't ever be done. As soon as I have time I'm putting one in. Fuel injected cars need to run at a specific temperature. When it runs below that temperature the vehicle runs in "warmup mode". It dumps more fuel to try and get the engine up to temp but it can't because the dumb @ss before me thought he was doing a good thing.

OK that's my venting for the day.

 

The thermo should definitely never be taken out! Same thing happened when I got my old Ranger--one day a week after i got it I got a CEL for engine running too cool. Went to put a new thermo in, here there wasn't one even in it at all. Turns out the previous owner took it out to mask the problem of a blown head gasket. Luckily she was still under warranty :-)

 

Yep people can't be trusted! Lol. Mine hasn't thrown a code but these jeeps are pretty primitive as far as throwing codes.

 

Thanks that's a lot cheaper than I was able to find by searching "neon 703 injectors".