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Old 07-14-2009, 08:08 PM   #1
Join Date: Jul 2009
Posts: 1
Strange Engine Rattle

Recently my 1989 Wrangler 4.2 was experiencing a strange engine rattle. Only happened on acceleration. Sounded like a main bearing, rocker bearing,etc. Engine ran fine except for the rattle. Once the engine reached RPM the noise would be less pronounced. Racked my head for weeks, did the timing chain, I was on the verge of dropping the oil pan to take a look. Then I pulled the vacuum advance off the distributor...the noise was gone . Not that I plan to run it without it ( but it doesn't run bad ).. I am planning to replace the distributor plate springs and the vacuum advance (Cheap first). Much better answer than main bearings, engine overhaul. I have used this forum MANY times to solve my problems... I hope this helps someone

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Old 07-15-2009, 03:14 PM   #2
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Join Date: Jan 2008
Location: vermont
Posts: 486
sounds like it was "spark knocking" from probably your timing advance springs shot. Replace the plate and parts like you planned on then check your timing to make sure it is ok. When you do your timing make sure the vacuum advance hose is disconnected.
94' wrangler 4 cyl. 5 speed D30/8.8 ARB
82' scrambler 350 TBI/700r4 D30/Currie 9"
07' JK sahara
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