geo2515
Junior Member
Greetings all and sorry for the broken record/ engine rattle post. I just cannot find an answer to this thing. I have this loud rattle knocking sound on acceleration- (like entering the freeway on a short ramp hitting it to get going). In neutral I can run up to 4k rpm and it sounds completely normal. The only time this sound is going on is on a hard throttle and nearly instantly on the downshift. There is a very slight stutter and decreased power when it does this, like a slipping feeling and sometimes what seems like a pop in the exhaust pipes. I duplicated this on the road for a dealer service tech about a month ago and after the only code was a misfire #5. They recc a spark plug change...
I have not yet replaced the plugs but inspected several coil packs and there is some green corrosion on some but not all the contacts. They look normal otherwise.
To save space I'll say the truck has been regularly and properly maintained- oil, trans, front axle bearings/joints, front ds, rear ds....Temps are all normal- 198/170/217
What could possibly be making this knocking sound under load and is it actually engine related or possibly exhaust headers? I don't know what a faulty exhaust header sounds like but this noise almost sounds like it is from under the motor area. Do worn coils/plugs make a rattle sound?
I have not yet replaced the plugs but inspected several coil packs and there is some green corrosion on some but not all the contacts. They look normal otherwise.
To save space I'll say the truck has been regularly and properly maintained- oil, trans, front axle bearings/joints, front ds, rear ds....Temps are all normal- 198/170/217
What could possibly be making this knocking sound under load and is it actually engine related or possibly exhaust headers? I don't know what a faulty exhaust header sounds like but this noise almost sounds like it is from under the motor area. Do worn coils/plugs make a rattle sound?