Outer Limits 4x4 Board

Hi Guys, Just picked up a HDJ79R tray (factory turbo) 190,000kms completely stock. I noticed driving home last night when I hold my foot in a constant position, at any speed I get a surging feel, kind of like cruise control cutting in and out but it happens every few seconds. I don't have cruise fitted so I know it's not that. I don't know anyone with one of these so i just wanted to know if it's normal?

Any info is welcomed.

Cheers, Wally.

Hi all...Thats definately not normal.

Hmm Thanks for that. The surge is ever so gental you hear it more than feeling it. It's hard to describe the rise and fall in RPM is about 100-200 RPM so not alot. Doe it in all gears when just resting your foot in the same spot and on a flat surface. When you accelerate it disappears.

one basic thing you can check is oil in the intake tubes. could be leaking from turbo or just out of the breather especially if its overfilled with oil.

Had a look around the engine bay yesterday afternoon. I found 2 very lose nuts on the intake manifold at the front of the motor. Also on the intake crossover pipe theres a vaccuum module the small rubber hose was lose, Ive done up the nuts and pushed the hose on further. I'm giving it a run today to see if thats sorted it out. It has a exhaust leak too where the turbo dump pipe joins to the the Cat. Looks like to bolts with springs and a flange it leaks between the join.

Thanks for your help guys.

No good still has the slight surge. I checked for oil in the intake pipes there was only a tiny film inside. Could it be the throttle sensor?

Got it sorted out at Turbo Engineering in Thomastown, had a diagnostics check ($260) there were a number of issues they sorted out for me. While it was there I had it chipped. It goes very hard indeed, I have since added a 3" straight through exhaust. I didn't realise these things hammer with chip and exhaust. 130kw at the wheels and 695NM according to the dyno report.

Thanks for your help guys.