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  #13  
Old 09-28-2013, 10:31 PM
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Ok battery and alternator checked out good. It starts up soon as I turn the key. But when it warm up I cant rev it to 2000 rpm. It makes a bogging sound and drops back down. Sound like its coming from the throttle.
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  #14  
Old 09-29-2013, 07:03 AM
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Re: Help!!!!

Is there any fault code set at the moment?
Do you have a scanner to see live data?
Did you check the battery voltage while accelerating the engine, because its then when the problem starts.
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Old 09-29-2013, 03:57 PM
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I dont have a data scanner. The dim lighting issue is not a problem anymore. It wont rev to 2000 rpm. It goes up then drops back down after it warms up. And I dont have anymore codes after I fixed the p0123 code.
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  #16  
Old 09-29-2013, 04:15 PM
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Re: Help!!!!

Shot in the dark but possible dirty MAF ( Not sure if it is a maf or air density sensor)
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  #17  
Old 09-29-2013, 04:45 PM
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How do you clean it?
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Old 09-29-2013, 09:47 PM
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Re: Help!!!!

Don´t know which engine you have, but both 4.0 and 4.7 have a MAP sensor. On the 4.0 its mounted on the throttle body and on the 4.7 on the front of the intake plenum. MAP is the number one input for fuel injector pulse. I don´t know of any cleaning of this sensor and the fact that the engine works fine when cold, i won´t expect it to be dirty. It could be faulty though.
But without observing the live data, it will be a shot in the dark.
If you have an android phone, you could download the free app Torque and just buy a cheap bluetooth dongle for the wireless connection to the jeep. This app can show you MAP, O2 sensor(s), inlet temperature and coolant temperature and many other live data, which could add in the trouble shooting.
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  #19  
Old 10-15-2013, 01:52 AM
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A mechanic I know said it could be some bad gas. He suggested some lucas fuel treatment and a couple of gallons of 93 octane gas on top of it.
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Old 11-27-2013, 09:30 PM
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It didnt work. Im going to try the app.
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  #21  
Old 11-30-2013, 02:23 PM
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Re: Help!!!!

I believe there is a pressure test port on the fuel rail, you could hook up a pressure gauge and see if you aren't getting enough fuel pressure. What brand fuel filter did you use? if fuel pressure is low at the rail (below 35-40psi if I'm correct) then either that filter/regulator is bad or the fuel pump is going out.
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  #22  
Old 02-27-2014, 11:17 AM
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Just got the problem fixed. It was between the cat being clogged or the upstream sensor. Any ideas of how this could of occured? Thanks for all the help.
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  #23  
Old 02-27-2014, 11:29 AM
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Re: Help!!!!

Quote:
Originally Posted by grandchero View Post
Just got the problem fixed. It was between the cat being clogged or the upstream sensor. Any ideas of how this could of occured? Thanks for all the help.
I've had a clogged fuel filter make the engine run lean enough to take out [as in clog] up a cat royally on a mazda rotary. The filter wasn't clogged for that long either--surprisingly delicate apparently.
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Old 02-27-2014, 11:42 AM
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Ok I had changed the fuel filter also. Thanks for that info.
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