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Old 12-02-2013, 02:45 PM   #1
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Problems after rebuid?!

Hi, forum. I have a few different issues here any input would be greatly appreciated. I just rebuilt my 2.5l engine for my 95 YJ not to mention replacing several parts over the past 10 or so months chasing other issues before having to rebuild. Here is the rundown of replaced parts: Refurbed cylinder head, rebuilt bottom end, distributor, cps, aic, clutch kit, coolant sensor, radiator, electric fan conversion, battery, all gaskets, map sensor, and other stuff I can't think of right now. So here is the problem. When I start the truck, it starts rough at low idle speed and slowly builds up then becomes eratic and eventually cuts off if i don't feather the accelerator. If I keep it running with the accelerator the temp guage starts going past 210 degrees but the fan doesn't kick on (set at 185) there is no smoke nor does it seem hot in the engine bay. I pulled my codes and got 13 and 14. I changed the MAP sensor and got code 14. I checked all vac lines, replaced some of them and used a volt meter to check all connections at ecu and plug and everything was the correct voltage. I even have a back up ecu and swaped it with the same results. I did get a code 24 after several other code checks but that went away. However while the truck is running if I unplug the TPS there is no change in the idle. It back fires at times and there are no leaks. So here is a Question. Does the TPS effect the MAP sensor which in turn causes the bad air/fuel mixture contributing to the rough running and possible overheating? Sorry so long I just wanted to give as much info as possible thanks again guys.

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Old 12-02-2013, 08:19 PM   #2
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Sorry guys I gave out some bad info earlier. The part I did replace was the TPS and NOT the IAC. I hope this helps I'm thinking of removing the AIC for inspection as it is not responding when unplugged. So the new question is can the AIC effect the MAP sensor.

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Old 12-03-2013, 04:51 PM   #3
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are your vacuum hoses correct? do you have vacuum on the map when you are supposed to?
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Old 01-14-2014, 03:36 AM   #4
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Sorry it took so long to write back, I just finished repairs on my house due to a large fire that started in the bathroom. That was really scary. Anyhow, I got back to work on the jeep and did the following: double and triple checked the vac lines all were good and in the right place. I tested for resistance when vaccum was applied to MAP and got fluctuation in the volt meter. I do get vac from the manifold to the MAP. I even tried to jump the wires from the ecu to the map to get it to recognize the MAP sensor with no changes except for bypassing its connecting sensors causing the ecu to flash codes for just about every other sensor including the map (13 and 14). So today I decided to remove and clean the throttle body completely and order new gaskets, AIC, MAT, and MAP cnnector plug. I'll keep you posted when it gets here and I install the parts. PLEASE! chime in with any info. My next move is either a new wire harness or another mechanic.
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Old 01-15-2014, 12:41 AM   #5
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Old 01-15-2014, 10:29 PM   #6
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Sorry IDK, but wish you well and sorry bout your house.
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Old 01-15-2014, 10:43 PM   #7
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If you are sure that the TPS is good and working, then the next choices are IAC, and the Oxygen sensor, both of those can cause the poor idle situation. As well as a clogged cat.

Any of these choices will cause the bad air/fuel mixture, which in turn causes the rough idle symptoms.
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Old 01-16-2014, 04:55 AM   #8
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Thanks, for the responses and concerns guys. Well, I know the TPS is just a few months old and working properly. I'm gonna replace the AIC and MAT cause I'm out of options. Do you think those could cause faults in the MAP though?

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