Best spark plug for a 93 4.0l? - JeepForum.com
 
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post #1 of 9 Old 03-31-2015, 06:46 PM Thread Starter
188slo50
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Best spark plug for a 93 4.0l?

PO put in platinum plugs with the 4 prongs and it has a stubble in the idle. Also has mismatched wires so just going to replace it all. What's a good plug that every one is running?

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post #2 of 9 Old 03-31-2015, 06:53 PM
Mean Max
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I like Autolite AP985 plugs.

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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

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post #3 of 9 Old 03-31-2015, 10:06 PM
Drednot
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I always run champion plugs in older jeeps.

I've had best luck running whatever the vehicle came with new. AC delco in chevys, autolite in fords. NGK , or ND in japanese bikes and trucks

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post #4 of 9 Old 04-01-2015, 04:04 PM Thread Starter
188slo50
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Isn't a champion and auto light basically the same plug? Not sure it came with factory but I do agree as to putting the same back in.
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post #5 of 9 Old 04-01-2015, 05:46 PM
nzpete
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Just get a plug that fits. I don't think you're going to notice any difference between an expensive platinum or some other precious material, and a plain ole champion plug. This is kind of like the oil debates folks will get themselves into.
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post #6 of 9 Old 04-01-2015, 06:29 PM Thread Starter
188slo50
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Think Im Going with champions since I've used them in the past on other things with no problems.
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post #7 of 9 Old 04-02-2015, 10:49 AM
mike134
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anything that is Copper Core and not clad with anything.

Platinum and iridium plugs are for longer life at the expense of performance. The jeep engine can often stumble with platinum clad plugs.

A stumble at idle is usually related to a vacuum leak or dirty IAC valve. I would recommend removing the throttle body and IAC and cleaning them with throttle body cleaner. THen use the throttle body cleaner and spray it on all of the vacuum hoses while the engine idles. Listen for a change in engine RPM. change any leaking vacuum hoses (or buy bulk hose and change them all if they seem overdue, one at a time so you don't mix them up).

Also, Just a reminder to grab a new fuel filter if you haven't done so recently.
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post #8 of 9 Old 04-02-2015, 06:12 PM Thread Starter
188slo50
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Quote:
Originally Posted by mike134 View Post
anything that is Copper Core and not clad with anything.

Platinum and iridium plugs are for longer life at the expense of performance. The jeep engine can often stumble with platinum clad plugs.

A stumble at idle is usually related to a vacuum leak or dirty IAC valve. I would recommend removing the throttle body and IAC and cleaning them with throttle body cleaner. THen use the throttle body cleaner and spray it on all of the vacuum hoses while the engine idles. Listen for a change in engine RPM. change any leaking vacuum hoses (or buy bulk hose and change them all if they seem overdue, one at a time so you don't mix them up).

Also, Just a reminder to grab a new fuel filter if you haven't done so recently.


No vacuum leak as that was my first thought. I'm going to do plugs,wires,cap and rotor.the fuel filter I did a while back so I'm good there but never cleaned IAC so I'll give that a shot.
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post #9 of 9 Old 04-02-2015, 08:28 PM
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Champion coppers are what they came with factory, and like to run. Stick with them.
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