Oil light comes on and the engine begins to make a knocking sound
I have recently had my fuel pump replaced. I started driving it and within about 5 miles some smoke began coming out of the the tail pipe, the oil light came on, and the engine began to knock. After letting the car sit overnight i started it and it took about 3-5 minutes before it repeated this process.
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Re: Oil light comes on and the engine begins to make a...
How much oil is left in the engine ?
the smoke was probaly oil burning,the knocking could be from low oil pressure,this could be very bad.check the oil and coolant levels and repost and let me know how they are.if any oil shows on the dipstick smell it and see if it smells burnt.
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The reasons are follows:
- Contaminated fuel.
- Knock sensor poor performance.
- Check exhaust system. If clogged, remove or replace the honey comb porcelain.
- Check ignition timing with scan tool at idle speed. (5 - 8 degrees BTDC).
- Check engine oil level. If the oil level is low, it may be one of the reasons for knocking, because oil may be burning during the combustion.
- Check fuel pump pressure. ( 41 - 49 psi).
- Remove negative battery terminal for 5 Sec or more. Reconnect the terminal. Close all doors, remove all electrical loads like room light, parking lights, blower motor etc. Start the engine and hold the throttle at 3000 rpm till the radiator fan becomes on to complete the idle speed relearn process. Release accelerator pedal after the radiator fan becomes on, and let it idle for 7 min more.
- Switch off the engine for 3 sec and you can then start and drive the car comfortably.
Hope that works.
If you feel like the engine is still ok, I would look at the oil pressure and check engine light issues. On engines with fuel injection, the fuel pump is powered by the pump relay until the engine starts. Then the engine has to have oil pressure to keep the fuel pump powered. Its a safety feature so if you are in a wreck the fuel pump does not keep running if the engine is off. I would want to know why the oil pressure light is staying on and what the trouble codes are in the computer.
I would check all external pulleys, and engine mounts first, but this may be an internal issue. Really there is not much information to go on here, and I'm only shooting in the dark, but also check the oil pressure in case the oil pump is worn. This will fail to lubricate at lower speeds, and may only begin to work at higher engine revs, which may account for the change in frequency over the range of driving you describe. I must warn that this is only a best guess however as honestly I really wouldn't know what this might be without looking at the car.
It all depends how loud the knock is. A tapping valve can be caused by low oil level, or dirty oil. Topping up or changing oil will solve the problem. A really loud valve tapping is abnormal. Cars sometimes make what you call a spark knock when accelerating hard. Extremely loud knock coming from deep within the engine is a bad sign, which means the engine has failed. Further examination would reveal metallic residue on the dipstick.
If you didnt have the crank ground or the rods resized and over sized bearings instaled then the issue with your engine is beyond advice other than remove engine and rebuild correctly as there is too much clearance and the oil cannot build enough pressure especialy when hot as it thins out and becomes harder to maintain pressure.Your problem is crankshaft bearings have excessive clearances or oil pumps pressure relief valve is jammed/jamming.good luck and hope its just the pump.