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Old 06-05-2011, 05:14 PM
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Recomended plugs

I was wondering what is a good spark plug for an 89 2.5. I just put new ones when I re did the head. But curious what you guys think are good plugs.

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Old 06-05-2011, 05:17 PM   #2
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I run AC Delco in mine.

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Old 06-05-2011, 06:07 PM
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I'm using champion coppers. Cause I was told that's what came stock is it true and should I leave those or is there some really good brand that I shouldn't go with out
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Old 06-05-2011, 07:18 PM   #4
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O have a 88 yj and I run NKG plugs.
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Old 06-05-2011, 09:04 PM
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Well the reason I was askin is because the jeep had a slight miss at stop lights. So I figured new motor maybe plugs ain't agreeing but I went to some families house and came out and now jeep won't start so something was messing up. It has spark and fuel pump comes on but nothing comes out of the injector.
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Old 06-06-2011, 09:59 AM   #7
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I run NGK's in mine. Fuel filter clogged, maybe?
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Old 06-06-2011, 10:14 AM
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Well the fuel filter isn't even a year old and the jeep would idle rough right before I shut it off but when I was driving it would be smooth So if the filter was clogged wouldn't I get a hesitation?I've been told crank sensor what do you think?
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Old 06-06-2011, 10:17 AM   #9
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Nothing coming out of injector it may be clogged.
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Old 06-06-2011, 11:04 AM   #10
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My money is always on checking out all the CHEAP stuff that could be wrong, the things that are free and simple. Then worry about all the multi-million dollar fixes. HaHa. Well, anyhow, you see what I mean. My coil wire came off and I never got a whimper from the engine. Such a simple fix, once I saw what it was, LOL. Good luck, let us know what happens.
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Old 06-06-2011, 11:08 AM   #11
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Forgot to mention, there is a lot of watered-down gas going around these days. I have friends who run repair shops and I'm alarmed at how many recent cases they have had of vehicles with water in the gasoline. It don't burn or run. What it does is shut you down if you have enough of it in your system.
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Old 06-06-2011, 11:37 AM   #12
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It wont shut anything down it will just not run if there is enough water in the gas. If it wont crank you need to pull the plugs out and spin it over to get the water out of the cylinders then drain the fuel system
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Old 06-06-2011, 11:43 AM   #13
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Well, that's what I mean, if it don't run then it's most surely shut down until proper steps have been taken to get the water out.
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Old 06-06-2011, 11:47 AM
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Well just checked it out definately a fuel problem pump comes on, has spark but single injector won't spray. I for got to see if injector has signal but the crank sensor is only $27 dollars so I'm gonna swap it for that price and eliminate that possibility
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Old 06-06-2011, 06:59 PM
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Ok so got it running. But this is how first off put crank sensor to no avail,cleaned injector to no avail. So sprayed starting fluid jeep not only starts up but runs normal. Injector sprays good. Now if you turn on off and or go for a couple rides then you shut it off come back to start and no spray coming from injector so spray starting fluid turn on and voila injector starts spraying like normal jeep runs normal.
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Old 06-07-2011, 09:28 AM
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Little up date this morning went out no start sprayed starting fluid and sarted up and runs good but at idle has slight stumble then I take off and it's good again. Then if I park for less than a half hour it starts every time I try it. If it sits for more than a half hour it won't start unless I spray starting fluid then it will run again and turn on as normal until it sits for more than a half hour and then it had to be sprayed again.
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Old 06-07-2011, 09:46 AM   #17
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sounds like your into more than just spark plug issues, but for the record. Bosch Platnium +4's. love em.........
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Old 06-07-2011, 09:53 AM
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Yea I am, just dont know where to go from here. Fuel pump or what?
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Old 06-08-2011, 10:30 AM   #19
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Sounds like fuel pump maybe
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Old 06-08-2011, 10:42 AM   #20
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i agree. it has to be a fuel pump or clog in the line somewhere? does it throw any ecu codes?
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Old 06-08-2011, 11:39 AM
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I have to look at the codes still. But can't be clogged once I fire it up it runs smooth except for the back fire when I down shift
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Old 06-08-2011, 11:39 AM   #22
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Im not sure fuel pump makes sense because just spraying starting fluid wouldn't make the fuel pump just decide to work fine from then on. I had a similar problem recently, I had a broken vacuum line, the one that goes into the intake just behind the throttle body. This was causing the throttle body to build up a lot of carbon. I replaced the line and completely cleaned the throttle body and now it runs like a charm.

This is just one situation that happened to me, very well not your problem but worth the one min it will take to check the situation.

Good luck man, keep us updated
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Old 06-08-2011, 11:53 AM   #23
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sounds like the fuel pressure is bleeding off.
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Old 06-08-2011, 02:25 PM
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Yea I have to look at this a lil more. I'll keep you all posted.unless any one can give more options I'd gladly like to hear them. And I will check all suggestions.
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Old 06-11-2011, 09:21 AM
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I found the problem. What is this? Because I remembered that the day the jeep started acting up I had pushed this little button in and I noticed today it was suck in so I pulled the tab off the button and voila the jeep started up with no staring fluid.
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Old 06-11-2011, 09:23 AM
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This is sitting on the side of the throttle body I would say right next to the linkage
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Old 06-22-2011, 12:00 PM   #27
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^ did this also take care of your rough idle issue?

i have a similar problem with my 2.5L
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Old 06-22-2011, 12:09 PM
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Well it's hard to say I don't have a rough idle any more but at idle I have this light skip or miss if you want to call it that but once I take off there's no hesitation just smooth throttle up through all the gears. And even at idle it's weird its smooth with a slight bloop bloop every couple a seconds. Oh but I still get that back fire now and again. But I have been getting better gas Milage since I got that switch working properly
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Old 06-22-2011, 12:14 PM   #29
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wow that is exactly how my jeep is, minus the back fire and skip, it is smooth through gears and does the bloop bloop thing. it did get to a point where it was an earthquake shaking idle in then i put in a bottle lucas injector cleaner and it calmed it down alot. so now i know it has something to do with my fuel system.
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Old 06-22-2011, 12:47 PM
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Well I know of like three jeeps here in my town. All with 2.5 in them. And there owners say I'm being @[email protected] That it's fine but I know my jeep and it's been a couple months since I rebuilt it. I expect it to be smooth with no bloops or hiccups no matter how good it sounds. But to be honest even though that bothers me a little I'm not messing with it for now cause this last week I've been getting way better gas milage than before even with this slight thing its doing at idle. How bad is yours?

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