Wierd sound when pressing gas pedal.

["350Vortec"]

Just recently i noticed a sound as i am accelerating my truck , it sounds like a kid ridind a bike with a card or stick stuck in the spokes. My rear driveshaft u joints are brand new, could this possibly be my front 4wd shaft joints?

 

[AtomicHoe094]

only on cold starts? whats your mph when you experience it and temp?

 

["350Vortec"]

Cold starts its worse yes. And about 10-20 mph and temp guauge running low. around 100. little above

 

[DJTricky]

CONGRATS... your engine is now broken in


piston slap... its kind of normal, you should think about changing your oil to a thicker synthetic. it solved my issue.

thats my 2 cents. just start her up and take a 5 min break before driving off.

 

[AtomicHoe094]

i was about to say the same damn thing.. pistonslap..

maybe use lucas oil additive if you want.. walmart has the stuff cheaper then the autostores

 

[bowtiefreak]

I would think in the winter you would want a thinner oil for those really cold days.

 

[DJTricky]

most of the time but i use 10w30 in the winter and 10w40 in summer with out 10w30 in the winter my piston slap was so bad. then i switched to synthetic 10w30 and no more issue.


might be a little harder for a stock starter to turn it over in -30 but i have the mean green super high torque starter

 

[ravingmadman]

Check your exhaust manifold bolts, too, before you get too crazy.

 

["350Vortec"]

I dont even know what the exhaust manifold looks like But it doesnt sound like its coming from the enigine. It almost sounds like a exhaust leak. Like a put put put. But it goes away when warming up? Maybe a seal is heating up as i drive and re sealing?

 

[DJTricky]

still sounds like piston slap to me