How do you adjust the timing on a 1989 buick regal 2.8 liter engine?

I have seen many time that the rug/mat may be preventing the accelerator to be completely depressed. Check that...

It depends on how much oil and how long the engine ran if any.
If you put in 2 quarts too much but did not start the engine, no worries.
if you put in 2 quarts too much and drove it for 50 miles, you could have damaged some seals and they may start leaking. Odds are you did not damage anything internally.

1995 Buick Regal 3.8 liter V-6 VIN "L"



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1995 Buick Regal 3.8 liter V-6 VIN "L"




1995 Buick Regal 3.1 liter V-6 VIN "M"




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There is no standard replacement interval for timing chains. There are some signs that will indicate that it is worn out like a rattle from behind the timing cover. If the engine has been taken care of the chain should last the life of the engine.

The only time I have changed them is if the vehicle has higher miles and the timing cover needs to be pulled to fix a problem like an oil leak or coolant leak. Otherwise they are not common repairs.

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In the engine compartment. Under the black plastic cover on the passenger side. next to the fuse box by the metal crossbar

1-6-5-4-3-2 is for the 3.8 liter engine
1-2-3-4-5-6 is for 3.1 liter engine

You didn't mention the engine size, so I included both diagrams...

1998 Buick Regal
3.8 liter SC V-6



1998 Buick Regal
3.1 liter V-6

It could be a few things..The map sensor,Throttle position sensor,Fuel pump,Mass air flow sensor..

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This is a serious repair job (I've done it several times) and a real beast for the typical driveway mechanic. It's nothing like the simplicity of a fan or alternator belt. It's inside the engine!
A $50 part and 10 hrs of labor. A sure way to kill a weekend (if everything goes well)
The front engine cover, housing the waterpump, etc must come off (usually the radiator, etc is in the way)

The relationship between the position of the crankshaft and camshaft is critical (these 2 major rotating parts are connected by the toothed timing belt. One notch off during re-assembly and the car will never run right if it even starts.

Buy a good shop manual (factory is best but aftermarket is OK) and examine the steps before deciding to take on this tough job.