Re: Engine rattle

Posted by HH56 On 2008/12/20 15:06:46

It does kinda sound like low octane knock which would be the case as you suddenly increase the load on engine with a shift. Am sure some of the engine experts will have a better idea.

As long as the engine does not have an increase in speed when shifting and then back down which is called "flare" in Packard lingo an additive might help.

There can also be a rattle at times in the shift to direct drive or what some would consider the "3rd shift" caused by the direct drive clutch facings not grabbing quickly. The flare needs to be corrected-usually by a throttle linkage adj. The direct drive can be alleviated by just letting up on gas when the shift happens so it is not under load at the instant.