1998 Jeep Cherokee spark plug pop out

1998 JEEP CHEROKEE
163,000 MILES • 6 CYL • 4WD • AUTOMATIC
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LOSTONE32
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i have a 1998 jeep grand cherokee 6 cyl 4.0 163123 miles i just had a fuel pump put in and had a diagnostic ran and everything was good later that day i was driveing and the number one spark plug pop out so i pull over and put another one in and drove about 30 miles and that one pop out so i put a new in and so far it ok thank god what would make them pop out.The other plugs that pop out was only two weeks old and i know i tight keep down right
Feb 8, 2009 at 12:38 AM
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KHLOW2008
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Hi lostone32,

Thank you for the donation.

Spark plugs would only pop out if they are not properly torqued. After spark plugs are hand tight, how much further did you turn to tighten?
Feb 8, 2009 at 5:51 AM
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LOSTONE32
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after i hand tighten i not to much harder put it was in and i did all 6 pf them the sameway and the frist just pop out and the last time i put the new one in seem like the hole was getting warp hole because the new spark plug was hard to tigten up
Feb 8, 2009 at 7:02 AM
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KHLOW2008
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Hi lostone32,

After hand tight, the spark plugs should be turn another 3/4 turn for new plugs.

The popping of the spark plugs has caused the threads to be slghtly damaged thus the difficulty in retightening.

When tightening this particular plug, you have to be extra careful as to get the correct torque, I would depend more on feel. If you are able to rethread by running a tap over it, that would solve the problem but you have to be careful of filings getting into the cylinder.
Feb 8, 2009 at 8:52 AM