0
There are several possibilities:
1) Your camshaft is worn (rare, it would have to be on a destroyed engine de to lack of oil) - Replace camshaft and overhaul engine
2) Your rockers are too tight and have caused damage to the pushrods and hydraulic lifters) - loosen them, remove them, remove the pushrods and roll them on a piece of flat plywood or glass to check them for bends).
3) Hydraulic valve lifters "blown" these devices fill with oil and hold pressure to "push" the valves open, if they are blown (do not hold pressure) they will not be strong enough to compress the valve springs, - "Fish" your valve lifters and fix them (it is easier to replace them).
4) Your distribution chain is broken, remove the water pump, behind it there is a metal cover, this covers two sprockets, one is twice as large (the camshaft one) as the other (the crankshaft one), there is a chain which joins both sprockets, just like in a bycicle, if it is broken, replace it, time the engine, (by aligning the marks on the sprockets) and try runnng it.
If the case is 4, your valves might be bent, sometimes the pistons hit the valves if the chain brakes, bending the valves.
5) lack of oil pressure, your oil pump is shot or your engine is blown.
There is also the possibility that your rockers are too loose, but that will generate a loud clicking noise, you don't mention the noise, so I assume that is not the case.
Good luck
Wiki User
∙ 10y ago
Add your answer:
Earn +20 pts
What is a pbc valve?
Did you mean PCV [positive crankcase ventilation]....that valve helps keep engine gasses from going to the atmosphere but wont allow intake pressure back to the crankcase.
How can you manualy open the zone valve for more heat?
If it is already open than you wont get more heat. If you have a normally closed type than there is a valve lever on one side that can be slide over and locked into place.
Timing Wont advance on 1990 Chevrolet 5.7 engine?
Need to replace the electronic timing controll module. It is mounted over by the left valve cover, But bolted on the intake.
98 blazer starts but wont stay running?
my guess woul be that your EGR valve is bad or is sticking i would pull it out and check its the thing under the inlet of your intake if its good then the valve on it will move back and forth easy if its bad then it will stick
Where is the egr valve on a 94 eagle talon dl?
if it is a 2.0 it will be bolted to the back of the intake manifold on the tb side. concidering the guy who actually posted this answer above this typing knows nothing but where its at he is right look behind your thermostat housing on the intake manifold you will see the egr valve if your not a California model u wont have one though
Ok you have a 92 Nissan 240sx when you try to start it the eingine cranks its getting fuel it has spark and the starter is working properly but for some reason it still wont start Any guesses?
crankshaft-camshaft timing, clogged exhaust, plugged intake, intake manifold leak.
What happens if you put a PCV valve in backwards?
pcv valve wont work properly
Why wont your ktm powerband come in on the topend?
usually its an issue with the reeds.and if you have a power valve it could be stuck open. but i would suggest having new reeds put in.
Why wont supply valve for toilet shut off after valve is closed?
It needs a new washer in it.
89 Pathfinder turns over but wont start Smells of gas and ignites out of air filter housing when stopping turning it over?
Incorrect firing order, spark timing, cam timing, or intake valve operation.
What causes Scan Tool Trouble code P0011 intake valve timing controlon a 2002 Nissan maxima?
"A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)symptomsHard starting, bad idle and possibly stalling issuescaused byIncorrect camshaft timingWiring issues (harness/wiring) in intake timing control valve control solenoid systemSteady oil flow to VCT piston chamberFaulty timing valve control solenoid (stuck open)the fixThis code indicated a mechanical issue, electrical troubleshooting wont help so replacement of the VCT or one of it's related components is necessary.
How do you know if a have a bent mechanism on my trumpet?
If you have a bent valve slide, or valve, or valve casing, they usually wont move. Valve's and valve casings would prevent the valves from moving, while bent valve slides wont easily pull out. If you suspect a bent valve, valve casing, or slide, try cleaning and oiling it first, valves and slides can become stuck with the lack of valve oil or slide grease.
