need help: car doin something weird.

**jessicaWs6** · 07-21-2008, 11:14 PM

alright i need help.. so my ws6 when im in neutral i idol fine but then when i step on the brake [while in neutral] and then let it off... my rpm starts bouncin up and down. not high but just a little enough to notice and to hear.. my friend had the same problem with his camaro with his distributor but it aint da same thing with my car because i dont got that.. n e one know wat is wrong??

**bigrondownhiller** · 07-22-2008, 12:29 PM

If it only changes by 100 rpm or so do not be worried. It is probably just from the vacuum used by the brake booster.

**sunsetorangess** · 07-22-2008, 03:24 PM

Yepp i agree with above, how high or low is it jumping?
J

**jessicaWs6** · 07-23-2008, 10:13 AM

thank you..

it jumps from a little above 1000 then back down and keeps doing it. but sometimes it doesnt do it and other times it does :/

**0rion** · 07-23-2008, 07:53 PM

I wonder if you might have a cracked hose or something that's showing up when vacumm is applied to the hose?

**4Bowties** · 07-23-2008, 09:05 PM

Bad Ground. Same situation in my 1994 LT1 Corvette.

**KING Z28 HAWK** · 07-23-2008, 11:13 PM

Originally Posted by 4Bowties

Bad Ground. Same situation in my 1994 LT1 Corvette.

+ 1

**99ta/cg** · 08-13-2008, 03:49 PM

when i put my car in neutral my rpms do change they go a 100 or 200 lower then when i have it in drive ive never had a problem with it thought it did it cause i took it out of drive

**jessicaWs6** · 08-14-2008, 09:16 AM

Originally Posted by 4Bowties

Bad Ground. Same situation in my 1994 LT1 Corvette.

that might b it.. but the guy who had the car stripped the ground wires and i replaced them again. it could still b it??

**ntimid8r** · 08-14-2008, 09:26 AM

It sounds more like a vacuum line issue like what Orion mentioned in post #5. The brake booster is tied into the engines vacuum system and since this only happens when you push on the brake at idle.......seems like a vacuum leak somewhere. Start looking at the hoses from the brake booster to the back of the intake. Also check all the small lines near the pcm.