Idle

[turk1shk1d]

Hey guys, i got a5 speed 325i that idles at around 650rpm is that normal? And when i step on the gas slowly it picks up pretty well but when i hit the gas a little harder the idle drops down to 450-500 rpm and feels like the cars about to shutoff but then picks up and goes.... And sometimes when i come to a stop at the redlight the idle gots up and down 2-3 times between 750rpm-1500rpm and then settles at 650rpm...???...

[turk1shk1d]

Idle

I changed the sparkplugs and wires... Still the same, im going to change the cap and rotor soon... Im going to try and clean the icv... Anything else it may be?... And also i just got a checkengine light after i drove it maybe 100 miles after i changed the wires and plugs

[digger]

TPS works? vacuum leaks?

[turk1shk1d]

TPS works? vacuum leaks?

There is no vacuum leaks... I actually did not check out the tps yet... How would i know?

[jlevie]

Are you saying that there are no intake leaks because a properly executed smoke test was done? If not you can't make that statement. What you describe sounds most like intake leaks.

[Not_the_stig]

Have the same problem gotta be a vaccum leak

[turk1shk1d]

Are you saying that there are no intake leaks because a properly executed smoke test was done? If not you can't make that statement. What you describe sounds most like intake leaks.

How would i test it properly?

[jlevie]

How would i test it properly?

By having a shop run a smoke test. With the exhaust plugged and the AFM replaced by a plug with a nipple for oil smoke injection one can say that there are no leaks when 2-4psi of smoke pressure can be held for at least 5 minutes with no leaks.