Help with engine rock

[blueworr19]

Hey just got another 240..its a 91 with 150k KA no mods my daily...Anywho basicly at sits at 700-800rps and the motor rocks a little enough to feel it as if its misfireing...1st thing i checked is the sparkplugs and caps they look good..there is no vac leak...and i dont think its the gas...

so that leaves me to think: fuel filter...anyone have any ideas?

as always you guys are the best..ps my 93 is now project and the SR is coming out and im rebuilding the car soon

[OutToWinPAHC]

Check fuel injectors too.

Maybe spend a little and do a full tune up, fluids, filter change too.

[blueworr19]

yeah need to check that too...question where could find what a full tune up for a 240 with 150k on it be? or if you no could u expalin

[OutToWinPAHC]

Well if I just bought your car with 150K

I'd remove the chain guide, valve cover gasket, plugs, wires, cap, rotor, PCV, Air filter, fuel filter coolant flush, oil change, clean TB, clean IAC, inspect belts

[blueworr19]

ok i can do most of that..but the chain guide? maybe its called something else? pcv? and IAC...i dont no the abrevations...and clean the TB?

btw thanks for your time

[OutToWinPAHC]

Clean the throttle body, they usually get grimey.Clean the IAC (Idle, Air, Controller).Replace the PCV valve (Positive Crankcase Ventilation valve) a cheap one way valve that releases pressure in the crank case. Its a 5-10 dollar part that takes about 5 minutes to replace. And there are write ups on the chain guide.

Welcome to Nico, I suggest you click back to the 20sx/180sx/Silvia forum and click on the Ultimate sticky...... tons of good info in there.

[blueworr19]

Thank you for explaining all that...i jsut found that post aswell..im gonna try posting both my 240's soon

thanks again im sure you wil hear from me

[AZ89two4Tsx]

Your motor mounts might be shot.

[blueworr19]

That is the 1st thing i looked at they seem good to me