Truck jerking under boost
#1
Truck jerking under boost
Hey guys my truck has been jerking a little bit and making a metal sounding clank...it's only when I get it into boost if I'm just cruising on the freeway it's fine no matter what my speed is but as soon as I start building boost it starts jerking and make the metal sounding noise. I can push thru it and it builds boost all the way thru. If I let off the gas to stop the boost it's fine. Also the rpm changes slightly with the jerking until i let off the gas. Any ideas what could be happening? It's on a speed density tune and was running fine for the past 2 or 3 months. I've changed spark plugs and gapped them at 28. Still have the same issue. No codes are being thrown either.
#2
TECH Senior Member
iTrader: (2)
Still sounds like a misfire to me.
Can you log all 8 cylinders to see if you can catch a misfire happening even though it doesnt throw a code?
Or you could get it to misfire and start applying the brake to keep it in the sweet spot and wait for a misfire to pop up.
Can you log all 8 cylinders to see if you can catch a misfire happening even though it doesnt throw a code?
Or you could get it to misfire and start applying the brake to keep it in the sweet spot and wait for a misfire to pop up.