Question about 1992 Buick LeSabre
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...
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
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Nov 11, 2013 | 1990 Ford Bronco
I want you to get a can of intake cleaner (ABOUT $5.00) from any local auto parts store like NAPA or Carquest, do not use carburetor spray, intake cleaner only or u will damage the Teflon coating inside the throttle valve and air bypass valve, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
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