mine seems really low. almost at like 500rpms. sometimes a hair under. it also is sometimes kinda rough. my guess is I have to rseal my intake manifold front and back, and underneath.
Major Contributor
what rpm does your 540ia idle at?
mine seems really low. almost at like 500rpms. sometimes a hair under. it also is sometimes kinda rough. my guess is I have to rseal my intake manifold front and back, and underneath.
5-10 Grand Master
m60/62s run 550-800 depending on what's pissing them off and what mood they are in, they are usually happy in the upper 600s low 700s, the intake leak will screw with it pretty good
all america wants is cold beer warm cat and a place to take a poop with a door on it
Big Time Poster
Lol!
Originally Posted by winfred
That's some funny **** winfred
Mine has just started running very similar to that and the best part is it's after I have replaced the Ducting between the MAF and the Throttle body. I guess it may have now begun to leak.
Will do a bit of a search and run some checks.
Cheers!
Boom 'n Zoom
Major Contributor
thats what im thinking. sometimes it will "chug" and barely stay at 500rpms and acts like it wants to stall but doesnt.
mine idles at 500, sometimes at 490, although I'm pretty sure it's not supposed to be that low. Idles at 600 with a/c on.
Grand Master
mine is at 480 when warm after idle, it idles smooth and has no hesitation when i put the pedal down.
when its cold (like, 0F) it starts at 900, then drops to 750ish in about 20s, then will continue to drop as the engine temp goes up.
Alusil, Dinan DME | ITG Air Filter | Eibach/Bilstein HD | 26/20 Swaybars | Iridium plugs | Depo/ProLumen HID | Optima batt. | no AC | Stoptech brake lines, Frozen rotors, brass bushings, Superblue
Big, Big Time Poster
Mine generally idles at about 600 rpm. O think the specification is 600 +/- 50.
Mine used to generally idle at 500 - this idle speed would sometimes couple to the chassis (maybe the motor mounts are due for replacement) but I wouldn't say it was rough.
I had the PCV plate changed which made a slight improvement. I then had the valve cover gaskets changed and now it only occasionally idles at 500.
Grand Master
just under 500 with no hesitation or issues. does sound a bit lumpy sometimes but sounds goooooooooood!
Major Contributor
Easy test for your BMW Manifold leaks. Buy a can of "Easy Start"(or what ever they call it over there,carbon tetrachloride), warm engine, spray carefully on manifold,when revs go up you have found the leak, if they do not, no leak.DO NOT try this with a diesel, it will not work due to no vacuum,teaching granny to suck eggs i know but its amazing how many people break top rings in diesels with "Easy Start".
Big, Big Time Poster
I haven't got a diesel but I'm just curious as to why you can't use Easy Start to find a leak on a diesel. I thought that as the pistons in a diesel engine descend, they create low pressure in the cylinders which sucks in air (via the air filer and manifold etc). So why is there "no vacuum" in a diesel?
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