Rough idle (after catback and boost gauge install)
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Rough idle (after catback and boost gauge install)
My car was stock for a little while until a couple of days ago I put on an Perrin cat-back. I also threw in an oil-pressure and boost gauge [the boost gauge is not completely hooked up yet (p.s. if you give the guys helping you to much beer they get drunk and rowdy and don't finish working on your car)].
Anyway now at idle my car sounds like an old man on crack. It sits at about 1000 rpm then will drop to around 300-400 almost sputtering out. It sounds like it is idiling a lot harder than it ever did before.
I asked a friend of mine and he said that his Firebird used to do the same. Thats all well and good but my car is a 2004 not a 1983. Is this anything to worry about? And if so how do i fix it?
Thanks in advance
Anyway now at idle my car sounds like an old man on crack. It sits at about 1000 rpm then will drop to around 300-400 almost sputtering out. It sounds like it is idiling a lot harder than it ever did before.
I asked a friend of mine and he said that his Firebird used to do the same. Thats all well and good but my car is a 2004 not a 1983. Is this anything to worry about? And if so how do i fix it?
Thanks in advance
Registered User
Joined: Feb 2004
Posts: 720
From: The Hunted Forest
Car Info: Mazda Protege '02 (Wishing protege has AWD and a H6 twin turbo)
Originally Posted by WRXcape
My car was stock for a little while until a couple of days ago I put on an Perrin cat-back. I also threw in an oil-pressure and boost gauge [the boost gauge is not completely hooked up yet (p.s. if you give the guys helping you to much beer they get drunk and rowdy and don't finish working on your car)].
Anyway now at idle my car sounds like an old man on crack. It sits at about 1000 rpm then will drop to around 300-400 almost sputtering out. It sounds like it is idiling a lot harder than it ever did before.
I asked a friend of mine and he said that his Firebird used to do the same. Thats all well and good but my car is a 2004 not a 1983. Is this anything to worry about? And if so how do i fix it?
Thanks in advance
Anyway now at idle my car sounds like an old man on crack. It sits at about 1000 rpm then will drop to around 300-400 almost sputtering out. It sounds like it is idiling a lot harder than it ever did before.
I asked a friend of mine and he said that his Firebird used to do the same. Thats all well and good but my car is a 2004 not a 1983. Is this anything to worry about? And if so how do i fix it?
Thanks in advance
Registered User
Joined: Feb 2004
Posts: 720
From: The Hunted Forest
Car Info: Mazda Protege '02 (Wishing protege has AWD and a H6 twin turbo)
just get a can of wd-40 and spray on the vacuum line
if the idle suddenly jumps up a bit it would mean you have a leak there.
if the idle suddenly jumps up a bit it would mean you have a leak there.
VIP Member
Joined: Nov 2002
Posts: 1,646
From: NYC
Car Info: 02 WRX WRB
If by "not completely hooked up yet" you mean that the hose was connected at the engine but not connected to the gauge, then this is your problem. The open line from the manifold is causing a vacuum leak. If you aren't going to finish the gauge install immediately, either remove the tap and put the line back the way it was, or plug the end of the hose with a tight-fitting screw so it doesn't leak any more. Once you take care of this your car should run normally.
not to hijack the thread, but i kinda have a similiar issue with my boost gauge. I dont notice any differences in idle, but the needle in my boost gauge kinda shakes at idle but then it smoothly climbs as i drive. Sometimes its smooth, sometimes it shakes like crazy at idle.
Registered User
Joined: Feb 2004
Posts: 720
From: The Hunted Forest
Car Info: Mazda Protege '02 (Wishing protege has AWD and a H6 twin turbo)
Originally Posted by oct1285
not to hijack the thread, but i kinda have a similiar issue with my boost gauge. I dont notice any differences in idle, but the needle in my boost gauge kinda shakes at idle but then it smoothly climbs as i drive. Sometimes its smooth, sometimes it shakes like crazy at idle.
I believe the boost gauge stock is setup to be connected into the blowoff valve vacuume line.
Originally Posted by RoadSpike
Where did you tap into.
I believe the boost gauge stock is setup to be connected into the blowoff valve vacuume line.
I believe the boost gauge stock is setup to be connected into the blowoff valve vacuume line.
Registered User
Joined: Feb 2004
Posts: 720
From: The Hunted Forest
Car Info: Mazda Protege '02 (Wishing protege has AWD and a H6 twin turbo)
Originally Posted by oct1285
i tapped into the stock bov line. The thing works and reads boost, but i kinda want it to work perfectly.
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iTrader: (2)
Joined: Apr 2003
Posts: 9,351
From: pompous douchebag
Car Info: $200,000 sports car
Originally Posted by oct1285
not to hijack the thread, but i kinda have a similiar issue with my boost gauge. I dont notice any differences in idle, but the needle in my boost gauge kinda shakes at idle but then it smoothly climbs as i drive. Sometimes its smooth, sometimes it shakes like crazy at idle.
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iTrader: (2)
Joined: Nov 2002
Posts: 15,425
From: Under your bed, in your closet, and in your head
Car Info: Corvette Z51
This might not remedy the problem necessarily, but remember to reset your ECU whenever you slap on a new mod. It could help, but then again the problem might be bigger than just that. Good luck.
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