Question about 1992 Buick LeSabre

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Engine knock when going uphill +...

I have a 1990 Ford Bronco. At idle the engine runs fine. At freeway speed it runs fine. But when I head uphill (especially on back roads) it has a knock. If I push the pedal harder and get it to drop down a gear, then the knock stops. When the knock occasionally starts on the freeway, you can floor it, get it to drop down a gear, then left off and let it catch overdrive again and it stops.
I just installed a new oil pressure gauge and it idles at about 55 psi.


Any help would be appreciated...

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  • jacob_falls Feb 06, 2009

    The whole time the pedal stays at that point its a steady clunk, clunk,clunk, clunk... Same pitch everytime.

  • jacob_falls Feb 06, 2009

    Also, I've never noticed it while the engine is still warming up. It is usually at its normal operating temp.

  • chuck1donly1 May 11, 2010

    I need more info, like is it one loud knock or is it a series of knocks?

  • Anonymous Mar 30, 2014

    87 silverado when you go to grab gears *(automatic) up hill or on the freeway the pedal is to the wood but the engine isnt delivering although the engine is roaring no go trans fluid is full but still nothing and oil presure is high

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Oil pressure might actually be a bit high for idle. High or low oil pressure in an older engine tends to be indicative of some serious issues. Oil pressure that is too high tends to be a clue that you have serious carbon build up. That aside, have you tried running a higher octane fuel, or perhaps adding an octane booster to your normal grade? Pinging can become knocking in a badly worn engine. One recommendation: At your next oil change try substituting a quart of marvel mystery oil or lucas engine oil treatment in place of one quart of your normal oil. Both have some pretty good track records for helping to free up sticking valves and break up carbon in older engines. I'm an old timer myself, and I personally swear by Marvel for older engines. There is no "rebuild in a can" but Marvel comes close. Give those a shot, let me know what happens.

Posted on Feb 06, 2009

  • Randall LaClaire Feb 09, 2009

    A knock that occurs only at warmer temperatures and not at idle during warm up is indicative of a problem with a part that is expanding from the heat of the warmed engine. Again, it points toward wear of components. A worn journal bearing on your crank could point toward a piston problem. The fact that it seems to stop when you hit passing gear and then return to overdrive is a bit quirky though. I'll need to think on that and see what comes to mind.

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