Question about 1990 Cadillac Fleetwood

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1979 cad fleetwood brougham knocking sound from,engine

My engine is making a knocking sound when in park im scared to move it or put it in gear for fear of messing it up more when i press on the accelerator the sound gets louder and worse my car is leaking oil at the rear main seal my stop engine oil pressure light was coming on at stop lights (i just bought the car) then the light stopped coming on the car got towed and when i got it out of tow i drove it home and parked it i tried to start it the next morning and the knocking started

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Sometimes collapsed lifters or loose rocker arms can cause knocking sounds in an engine. However, the fact that there was a possible loss of oil pressure and that the knocking gets louder as the rpm's increase, would indicate that there is damage to a connecting rod bearing and possibly the crankshaft. If the latter is the case you are looking at a fairly substantial repair bill.

Posted on Apr 14, 2009

  • wmsfarris
    wmsfarris Apr 14, 2009

    I forgot to mention, until you find out for sure what the problem is it is better not to drive the car, as more damage could result.

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Engine knocking


Hi,
Good news is - I don't think you need a new engine.

As there are many moving parts that could create a knocking sound, it usually needs careful inspection to identify where it is from.
I will give a list of some of the causes and remedies. Yours will probably be one of them, but unless I was there - it could be any.

Loose exhaust component (causes rattles and thumps) - replace parts or joints.
Loose Engine mounts - Engine will move about a lot more than normal - Replacement of mounts.
Fraying Belts - causes continual ticking or slapping - Replace belts and check tension.
Timing is off - bad running, lack of power, pre ignition or knocking at low revs. Check timing belt - Replace, Tune engine.
Cracked valve - slight misfire worse at low revs - Replacement valves.
Clutch Problems - Broken spring or loose bolt - Check clutch plate - replace clutch plates.
Older engines - often accompanying smoke -
Broken Piston ring - continual ticking or occasional misfire - Replace Piston rings
Worn Piston bearings - Piston Slap - Replacement of all piston bearings.

Transmission Problems (only heard when in gear or with clutch out) - Broken gear teeth or worn bearings - Replacement of Transmission or rebuild.

Some of these remedies require engine removal and strip down, others are a simpler fix.

Dec 26, 2008 | 1990 Cadillac Fleetwood

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