Low idle at times ??

my 06 brm will idle as low as 720 rpm at times and sometime it will go to 800 then back down to 720 what could cause this ive check my cam and i have a new dmf i have also adjusted my timing...i hope its justs boost leak but just looking for some input ...any help would be great thanks

is there any big draw on the electrical system?

no nothing that i can think of no cel and ive checked most thing with vag com... egr work fine also

all started after vw replaced my dmf at 56,000 i have also recalibated the dsg but it didnt help

Is it idling at 720 in neutral or in Drive?

it will be that low in drive but doesnt change if i put it in park or neutral

Some suggest low RPMs (800 range) is MAF related. Not sure if this relates since yours fluctuates.

Have you hooked up VagCom to see if it's actually idling that low? Maybe the tach is flakey.

Would a dying tandem pump cause a flakey idle?

ive tried unpluging the maf to see if that would help but it remained the same when i have it hooked up to vagcom it matches whats on my tach but something i have noticed is when it is low and i hit the gas it will go back up to 800 but then fall back down... but i havent seen it past 800 since i got it back it used to be like 820 to 840 but at 720 it real rough with the down shifting is there any common leaks or could it be the flap on the intake getting stuck some how im very familiar with vw's but not so much on the tdi

Coolant sensor

r u talking about the ect on the radiator or the one thats in the over fil tank

Hey Hodizz,

Did you ever get this resolved? Mine appears to be doing the same thing. Not as low as yours, but definitely in the 700's.

Thanks!

hodizz said:

all started after vw replaced my dmf at 56,000 i have also recalibated the dsg but it didnt help

Click to expand...

Believe it or not, but mine sometimes idles at those RPMs too. This started after replacing a DMF to a SMF. Mine isn't a DSG but manual, though.

still idles low but i looking around when doing my oil change and looks like my egr cooler is leaking this might be causing this issue