HT4100 4.1, 4.5, 4.9 Discussion, time for a tune up.. whats involved. in Cadillac Engine Technical Discussion; Hey again. I think its about time for my 1993 caddy deville (4.9) to get a tune up its my ...
Hey again. I think its about time for my 1993 caddy deville (4.9) to get a tune up its my first car and im just now getting into really caring for it. I dont think its had any maintenence for the past 3-4 years atleast. and it sat around without being drivin for 6 months (previous owner). its got 114,XXX miles on it so I figured it was time to replace all the stuff that.. your supposed to? heh..
I plan on doing everything myself, if thats possible. I just need to know what all to do.
from what I know so far I need:
-flush cooling system.
I already changed the oil and air filter so that doesnt need to be done. also what can I expect from doing all this (performance wise) especially since it hasnt really been taken care of for awhile.
Cap and roter.
Air filter, maybe.
Lube the suspension.
drain and refill the the cooling system. Use 50/50 distilled water and a good brand antifreeze. Add Bars Leak sealing pellets, the one that comes 6 in a tube, put all six in.
Don't forget to replace the serpentine belt and check the idler and tensioner for bearing smoothness. Change it now or change it after it breaks and creates a mess. You may also check the alternator and water pump for bearing noise and smoothness.
Replace the plugs, inspect the wires and cap. Replace the distributor rotor. Clean the throttle body.
I can't remember the fuel filter # but replace that and the air filter.
If you just changed the oil filter without the oil, you will need to change the oil and filter together. Use Rotella T 15W40 oil with an AC/Delco filter. (see related posts on this forum)
Have the cooling system professionally flushed. Use the GM pellets #3634621. The cooling system flushers do a much better job than just draining and refilling, or sticking a garden hose in the system. And the old coolant is properly disposed of. This should be done on a bi-annual basis. No exceptions.
The 4.9 is a very good engine, and will run a long time if properly maintained.
get an o2 sensor, serp belt, thermostat(if ur gonna flush coolant. dont forget barks leak tabs). You may want to drop the trans pan and change the filter and fill her up with som fresh fluid. also may want to flush the power steering fluid.
Change the PCV valve to.. Its located under the plastic Cover on the front of the engine youll notice it when your changing the front spark plug wires. That should increase your MPG. Its simple to change just pull it from the valve cover take off the tube and put back in place.