map sensor - Page 2 - JeepForum.com

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post #16 of 46 Old 08-24-2011, 12:23 AM Thread Starter
zte87
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Could my intake temp sensor have anything to do with my problem? It runs the same weather it's plugged in or not!

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post #17 of 46 Old 08-24-2011, 05:49 AM
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You can't guage wether a sensor is functioning or not by unplugging it. The engine is in a default calibration if there is a fault code and when you disconnect the sensor it will put it into the default calibration to run the engine. If you are setting a map fault then the map voltage is out of tolerance at the computer and it is where you need to look.

Did you try the step by step in this link I posted?

http://www.jeepforum.com/forum/f12/h...ensor-1152970/
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post #18 of 46 Old 08-24-2011, 07:35 AM
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zte87, I would listen to Que, he has help more people than I have posts. There are several sensors to test that can affect the engine. Starting with the map, after its tests fine then go to other sensors. There are several posts that teach you how to test the sensors, like the one Que posted and if you can't find them ask.

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post #19 of 46 Old 08-24-2011, 07:44 AM
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Originally Posted by mdonovan8 View Post
zte87, i would listen to que, he has help more people than i have posts. There are several sensors to test that can affect the engine. Starting with the map, after its tests fine then go to other sensors. There are several posts that teach you how to test the sensors, like the one que posted and if you can't find them ask.
^^^^^^ this
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post #20 of 46 Old 08-24-2011, 08:44 AM Thread Starter
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Quote:
Originally Posted by Que89YJ View Post
You can't guage wether a sensor is functioning or not by unplugging it. The engine is in a default calibration if there is a fault code and when you disconnect the sensor it will put it into the default calibration to run the engine. If you are setting a map fault then the map voltage is out of tolerance at the computer and it is where you need to look.

Did you try the step by step in this link I posted?

http://www.jeepforum.com/forum/f12/h...ensor-1152970/
I am waiting till payday so I can go buy a volt meter! but it is on my list on things to do for sure. I just took this sensor out to look at it and it has a long of build up on it!

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post #21 of 46 Old 08-24-2011, 09:17 AM
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Try this:

http://www.harborfreight.com/7-funct...ter-90899.html

It will do the trick for basic troubleshooting
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post #22 of 46 Old 07-19-2012, 08:31 PM Thread Starter
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So I never figure my problem out and ended up just pulling the the cel bulb out of the dash, how ever I do have some different symptoms now to go along with it all! I still have a really crappy low idol and I back fire threw the intake when I get on the gas hard, I also cant rev past 4 grand! I would't think the gov would kick in at just 4k........ any ideas?

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post #23 of 46 Old 07-19-2012, 08:47 PM
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Did you get a meter to read the sensors? I really can help you if you have the meter and a little patience.
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post #24 of 46 Old 09-16-2012, 10:07 AM Thread Starter
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Yes I have a meter I just don't know how to use it lol!

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post #25 of 46 Old 09-17-2012, 09:58 AM
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Zte connect the cel bulb back up. The advance on the timing is controlled by the map sensor. I asked earlier if you used carb cleaner and sprayed around the engine, manifold, and all the vacuum lines looking for a vacuum leak? You need to start with the basics. Are you familiar enough with the meter to put it into dc volts and ohms/resistance?
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post #26 of 46 Old 09-17-2012, 08:48 PM Thread Starter
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My buddy said he would help me some with the tool, where should I start? There are no vacuum leaks that I know of!

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post #27 of 46 Old 09-18-2012, 07:22 AM Thread Starter
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So I understand that the map relies on other sensors to work but is the camshaft sensor of these sensors? I have spark but I am reading that I have some it the symptoms of a failing cps!

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post #28 of 46 Old 09-18-2012, 11:31 AM
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Originally Posted by zte87 View Post
So I understand that the map relies on other sensors to work but is the camshaft sensor of these sensors? I have spark but I am reading that I have some it the symptoms of a failing cps!

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Man, you need to take it one step at a time and start eliminating things systematically - you are all over the place. Que asked a couple very specific questions... did you check for small vacuum leaks? Let him walk you through using the meter as well... then you can move on to the next thing...

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post #29 of 46 Old 09-18-2012, 11:52 AM Thread Starter
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As I said there are no vacuum leaks in fact I just changed out the intake and exhaust manifold gasket yet again and also checked all the vacuum lines for leaks and still nothing. So just a recap my jeep has a bad idol until warms up, has really bad fuel mileage, when you get on it bucks and pops threw the intake but if fine when you take it easy, and it won't rev past 4k! I have replace the cap, rotor, plugs, wires, coolant temp sensor, iac, tps, o2 sensor, crank position sensor, and the map sensor twice! And my engine grounds seem to be good as we as my battery and the alt!

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post #30 of 46 Old 09-19-2012, 08:31 AM
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Zte, I was trying to be specific for a reason. The input voltage for the map sensor is the same voltage used on several sensors, but the output is not. The fact that the other sensors are not throwing faults, only the map sensor and the map sensor is measuring vacuum makes it only logical to start there. The fact that you said there is a difference in connecting and disconnecting the vacuum line tells me there is at least some function to the sensor.
I posted a link to how to test the map sensor itself along with a description on how it operates. It is the next step if you have looked for a vacuum leak by using carb cleaner. Here they are:
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