LIFTER OR ROD TAPPING IN MY 88 GRAND WAGONEER...

#11

That would likely rule out the timing then unless the distributor is
seized up internally and loosens up after it gets hot enough. To test
this, you can remove the distributor cap and grab the rotor and twist
it. It should twist under a strong spring load and pop right back. If
it doesn't, then the center well under the rotor needs oil badly. It
has a felt wick that is supposed to be lubed up every tune up.

It doesn't rule out the cracked exhaust though. They change noises with
heat.

One decent trick is to put a quart of ATF into the oil about 100 miles
before the next oil change. This will loosen up and clean out crud that
can build up in the oil.

Mike

ryanarch wrote:

Quote:

Okay Guys...here is another tricky part of the situation...further
explanation...I commute about 10 miles to work and 10 miles home. On
mile 8 or 9 of the commute in either way, the tapping noise ceases to
exist...but then reoccurs the next day. Very puzzling to me because
the Jeep drives fine, runs fine, and everything. Guess I should take
it in...I'm confused.

Thanks again!

Mike Romain wrote:
I would be checking the exhaust manifolds for a crack first and be
checking the timing second.

I have seen engines where the distributor has slipped after a tune up
and sneaky ones like the vacuum advance was left on or off depending on
your pollution controls during the timing setup. There were some
strange 80's emissions setups on some Jeeps, like the 258's of that
years timing was set at 1600 rpm, not idle.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

ryanarch (AT) gmail (DOT) com wrote:

Recently purchased my 88 Jeep Grand Wagoneer and had it in the shop for
a tune up and carburetor cleaning. It has a little over 150K on it and
I noticed a few days ago a tapping sound whenever any load is put on
the engine (going up hill or accelerating). It doesn't tap when idling
and seems to drive okay. I haven't checked to see if the gas mileage
has changed (even though it gets horrible mileage). A friend of mine
thought it could be a lifter or rod...not being a mechanic I have not
idea what is involved in the repair. Any advice would be greatly
appreciated.

Thanks,

Ryan

#12

Fill the tank with premium and add an octane booster. That would
*hopefully* get rid of minor detonation if that is what is causing it,
unless you have truly heavy carbon.

Think Mike or someone mentioned exhaust leak. If the noise consistently
goes away after a few miles of driving, I'd double check that, with the
engine cold, just to eliminate it.

ryanarch proclaimed:

Quote:

Okay Guys...here is another tricky part of the situation...further
explanation...I commute about 10 miles to work and 10 miles home. On
mile 8 or 9 of the commute in either way, the tapping noise ceases to
exist...but then reoccurs the next day. Very puzzling to me because
the Jeep drives fine, runs fine, and everything. Guess I should take
it in...I'm confused.

Thanks again!

Mike Romain wrote:

I would be checking the exhaust manifolds for a crack first and be
checking the timing second.

I have seen engines where the distributor has slipped after a tune up
and sneaky ones like the vacuum advance was left on or off depending on
your pollution controls during the timing setup. There were some
strange 80's emissions setups on some Jeeps, like the 258's of that
years timing was set at 1600 rpm, not idle.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

ryanarch (AT) gmail (DOT) com wrote:

Recently purchased my 88 Jeep Grand Wagoneer and had it in the shop for
a tune up and carburetor cleaning. It has a little over 150K on it and
I noticed a few days ago a tapping sound whenever any load is put on
the engine (going up hill or accelerating). It doesn't tap when idling
and seems to drive okay. I haven't checked to see if the gas mileage
has changed (even though it gets horrible mileage). A friend of mine
thought it could be a lifter or rod...not being a mechanic I have not
idea what is involved in the repair. Any advice would be greatly
appreciated.

Thanks,

Ryan

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LIFTER OR ROD TAPPING IN MY 88 GRAND WAGONEER...

4x4 Cars Discussions about 4x4 cars. The on and off-road four wheel drive vehicle. (rec.autos.4x4)

Re: LIFTER OR ROD TAPPING IN MY 88 GRAND WAGONEER... - 10-03-2006 , 09:12 AM

Re: LIFTER OR ROD TAPPING IN MY 88 GRAND WAGONEER... - 10-07-2006 , 12:19 PM