brdhntr Posted February 3, 2009 Share Posted February 3, 2009 i want to tune up the mj as soon as it's above 30. it's too cold to spend the time checking it out right now so i thought i'd just ask so i can be prepared. it's an 87 2.5 auto 4x4 with a/c and cruise. i was wondering how to get at the first spark plug. i looked at it once and it looked like that plug is under the ac compressor. is there a trick i should know about? what spark plugs work best have you found (specific brand and plug number). i normally use bosch platinums but they don't work in every motor. is the idle adjustable? What's the best setting? where is the fuel filter? is it a pretty easy job? i could go out and check my book, but that's all the way in the garage and it's 10 below. i can stay warm if i ask on here. :clapping: Link to comment Share on other sites More sharing options...
MiNi Beast Posted February 3, 2009 Share Posted February 3, 2009 Are you to lazy, oh I mean to cold to try the search button? :no: Link to comment Share on other sites More sharing options...
brdhntr Posted February 3, 2009 Author Share Posted February 3, 2009 no. i'll try that. :oops: Link to comment Share on other sites More sharing options...
brdhntr Posted February 3, 2009 Author Share Posted February 3, 2009 ok. i tried. unless you're better at it than me, i didn't find what i was looking for. so the questions still stand. :chillin: Link to comment Share on other sites More sharing options...
dasbulliwagen Posted February 3, 2009 Share Posted February 3, 2009 If every subject has been covered, and we tell everyone to just do a search, then what is this forum here for? May as well just be a Comanche wikipedia. The fuel filter is on the frame rail, real easy to get at, as far as that plug, I have no Idea, I havent been lucky enough to get one with AC yet. I like the platinums too, but not sure if they are any better than anything else. I think I put platinum Plus 2's in my 2.5, I havent had any issues. Not sure about the idle as it is controlled by the computer, check for vacuum leaks, and maybe try to clean out or get a new Idle air control. Ive yet to have an issue with that as well. Good luck! Link to comment Share on other sites More sharing options...
BLHTAZ Posted February 3, 2009 Share Posted February 3, 2009 AC Delco plugs are probably the recommended plug for that engine. I alos like the Bosch Platinums, but I have been told that they do not work well in the older engines. I have them in my 1995 HO 4.0L and in my 2002 4.7L Ram truck, but not in the MJ. "Idle", persé, is not adjustable, but I think the 2.5L has an adjustable IAC. If you are having idle issues you probably need to clean the throttle body & IAC. To get to that plug...you typically have to move the compressor. The 4.0L engine has the same issue, but I was able to get it using a wobble adapter and extension...but...it is a PITA and a lot of people say it's easier and faster to loosen & move the compressor. Link to comment Share on other sites More sharing options...
maddzz1 Posted February 3, 2009 Share Posted February 3, 2009 Yes, the fuel filter is on the driver side frame rail near the rear tire. I believe you are suppose to release the pressure thru the schraeder valve on the fuel rail before you disconnect it. For sparkplugs I have always read to stick with the stock champion plugs or maybe go to the champion truck plugs. I used the stock cheap champions. I also have not been lucky enough to have AC. Link to comment Share on other sites More sharing options...
Phoenix of Fury Posted February 3, 2009 Share Posted February 3, 2009 I was able to get to the first spark plug on my '86 2.5L using a few long extensions, a swivel socket, and mashing my hand down in there good. It's tough, but it's possible. Link to comment Share on other sites More sharing options...
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