Good evening all,
Been noticing a slight surging when holding steady speeds or when using cruise control.
Especially on one flat road I use for work.
It's like the engine speeds up, then slows because it sped up, spiraling to the point where I get a constant up and down.
Were talking 30rpm here however I'm concerned.
I'm running mhd 2+ full bolt on.
Index 12 injectors not sure if age
Coils, plugs, o2's, turbo cores and wastegates, dp's, intercooler, gearbox oil, boost solenoids all done well under 3k ago.
Oil changed 250 miles ago.
This has only really presented itself since the tune and I've only really started noticing now I drive it every day to work.
And once it get going it seems to consistant to Be a vacuum leak? See attached image of log.
Anyone have any thoughts? Was lucky when I run this log it done it at its worst.
Car idles fine, wot is fine, drives great. Hpfp pressures seem with range and constant under wot. Same with lpfp.
Hopefully someone has experienced similar?
Thanks!