vypa

So i did a quick search on this and didn't find anything other than "the tc sometimes has a surging idle - dont worry about it" from one person in one post

Anyways, I had been driving around with a prettty bad exhaust leak (toasted the turbo inlet gasket... 1/4 of it was melted off. its fixed now) and my idle was pretty stable (oddly enough)
Now the power still feels good, but the idle is realllly jumpy when i first turn on the car, and any time when coming to a stop after boosting. It stables out after it jumps up and down to about 500 up to almost 1500 about 3 or 4 times, then is stable. Is anyone else experiencing this? Is it anything to worry about?

vypa

by the way its a ZPI stage 1 (more or less) running 6psi and its been tuned with an emangage ultimate.

OuterHeaven

What blow-off valve are you using?? This almost sounds exactly like my Tial on my old stage 0.

vypa

Its the HKS SSQV BOV

olaHalo

any updates, ive heard of this happening on a few cars

Whocares05050

Strangly enough, my car just started to do the jumping thing. When im driving and i put the car in nuetral to come to a stop, it jumps up and down between rpms

rodlandscion

Well my car has always done that when I cold start, pretty sure that's just everything warming up.

And as far as the neutral stop: I think, and I'm no expert, but since your BOV just release all the air in the intake, that the MAF sensor gets a little confused. Although the HKS BOV design helps with this, it's still not perfect.

malibuboy54

did you change your spark plugs? i've never had a problem with my hks ssqv bov and i've had my kit for almost a year.....when i changed my sparks out for colder stepped ones, my rough idleing went away....never had an issue since....

satoman44

this is normal. this has happened to me when i was completely stock and now that im turbocharged. i think it just happens a little more now that i'm boosted.

vypa

Good to hear that this is common at least... its still just a touch annoying though.... and yes i switched spark plugs to one step colder ones when i installed the kit.

scandalous

^^ Exactly.

Your car was just sucking in lots of air and the MAF is sensing a lot of air coming in and then all of a sudden, the BOV releases that air and the MAF goes "what the heck? Where'd all the air go?!" causing the car to take a few seconds to even out and go back to normal.

vypa

its just odd to me, because it JUST started and the cars been turbo awhile... couple months at least i think...

Whocares05050

same thing here

pollup

my car usually idle surges from 550 to 700 or so rpms. now Q's doesnt. he also has a stage 1 with zpis map. i have been tuned. only differences is mine is an 06, his is an 07.

vypa

curiouser and curiouser.... i think im going to run a compression test regardless... i cant decide if i am losing power or not. My friend was saying the car sounds a lot different than it did.... and i dont break traction in 2nd like it did when i first got the car tuned, but that could be attributed to the slipping clutch im not sure... in any case at least if i do a compression test i know the idle surging is most likely nothing to worry about.

318_tC

mine does this also

Whocares05050

When will you be testing this?

vypa

its hard to say... if i dont get it done by the end of this month.. june... its probably going to be a bit... so hopefully soon.. need some free time and an extra set of hands