engine revving at idle

darenufee · 02-25-2008, 09:33 PM

While driving an 08 lx home today, I stopped at a red light and the motor started racing up and down( about 1.5k to 2k) and when I took off there was no power. After pulling in a parking spot and turning the engine off, the car restarted and ran fine, but I had a cel. has anyone seen this before or have an idea what the cause is? The mods are a k&n intake, megan downpipe, magnaflow exhaust, and they have all been on the car for over a 1k miles.

tonyv107 · 02-25-2008, 10:46 PM

was it overheating?

laughoutlloyd8 · 02-25-2008, 10:49 PM

dude i get the samething with my si, especially when its a cold start, i drive off my drive way and when i get to my first stop sign, sometimes it revs when i apply my brakes.......

Asif22 · 02-25-2008, 10:50 PM

air leak?

Check all the fittings and bolts then reset the ecu

Or take off the intake and put the stocker back on and then go to the dealer

Si 07 · 02-25-2008, 10:55 PM

Quote:

Originally Posted by Asif22

air leak?

Check all the fittings and bolts then reset the ecu

Or take off the intake and put the stocker back on and then go to the dealer

i had a vacuum leak in my integra, similar thing happened.

darenufee · 02-26-2008, 08:19 AM

Well at no point did it overheat, and I was in the middle of a 20-mile commute. I checked everything under the hood, but nothing was loose. I reset the ECU when I got home and it seemed to be fine...I guess we'll see. If it comes up again I think I'm with you asif.

07k20z3ftw · 02-26-2008, 08:47 AM

id check your intake/manifold to see if theyre sitting tight and that everythings working properly. i dont have LX so i cant really be much help, but the Si's have some issues in the cold, and if your a/c is on at a light your tach can bounce a little bit occasionally...but i dont think thats what your talking about..

FG207Si · 02-26-2008, 08:58 PM

sometimes i have a similar issue when i drive the car for a while. When i apply brake while going to a stop the engine revs up 2 about 1.2-1.3 and then drops down back to normal.

ro.sniper · 02-27-2008, 09:18 AM

same thing happened on my 99 ex, problem = vacuum hose leaking

also power would sometimes cut out on highway, but car turned itself on since it was a manual...

darenufee · 02-28-2008, 08:58 PM

OK....2 days later, and still nothing. Car running fine, and no CEL. Pretty sure that eliminates a vacuum leak. Anyone have another idea for a cause?

darenufee · 03-02-2008, 01:32 PM

ok now we're at the 150+ miles since the incident. I wish I hadn't cleared the computer because now I have absolutely no clue as to the cause.

KingMarineM16a4 · 03-03-2008, 01:05 AM

Quote:

Originally Posted by darenufee

While driving an 08 lx home today, I stopped at a red light and the motor started racing up and down( about 1.5k to 2k) and when I took off there was no power. After pulling in a parking spot and turning the engine off, the car restarted and ran fine, but I had a cel. has anyone seen this before or have an idea what the cause is? The mods are a k&n intake, megan downpipe, magnaflow exhaust, and they have all been on the car for over a 1k miles.

Check the following items..

Coolant level
MAF(mass air flow sensor)
Vacuum leak
and the most common item in this case the IAC (idle air control valve)

02-25-2008, 09:33 PM	#1 (permalink)
darenufee Junior Member Join Date: Dec 2007 Location: Florida Posts: 14 iTrader: 0 / 0%	engine revving at idle While driving an 08 lx home today, I stopped at a red light and the motor started racing up and down( about 1.5k to 2k) and when I took off there was no power. After pulling in a parking spot and turning the engine off, the car restarted and ran fine, but I had a cel. has anyone seen this before or have an idea what the cause is? The mods are a k&n intake, megan downpipe, magnaflow exhaust, and they have all been on the car for over a 1k miles.

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02-25-2008, 10:46 PM	#2 (permalink)
tonyv107 Senior Member Member Join Date: Jan 2008 Posts: 521 iTrader: 0 / 0%	was it overheating?

02-25-2008, 10:49 PM	#3 (permalink)
laughoutlloyd8 Senior Member Join Date: May 2006 Posts: 1,486 iTrader: 4 / 100%	dude i get the samething with my si, especially when its a cold start, i drive off my drive way and when i get to my first stop sign, sometimes it revs when i apply my brakes.......

02-25-2008, 10:50 PM	#4 (permalink)
Asif22 Senior Member Join Date: Jul 2007 Location: United States Posts: 2,808 Mohamed El-Mubaslat iTrader: 0 / 0%	air leak? Check all the fittings and bolts then reset the ecu Or take off the intake and put the stocker back on and then go to the dealer

02-26-2008, 08:19 AM	#6 (permalink)
darenufee Junior Member Join Date: Dec 2007 Location: Florida Posts: 14 iTrader: 0 / 0%	Well at no point did it overheat, and I was in the middle of a 20-mile commute. I checked everything under the hood, but nothing was loose. I reset the ECU when I got home and it seemed to be fine...I guess we'll see. If it comes up again I think I'm with you asif.

02-26-2008, 08:47 AM	#7 (permalink)
07k20z3ftw Senior Member Join Date: Jul 2007 Location: Outside of Orlando, Florida Posts: 1,442 Mitch iTrader: 0 / 0%	id check your intake/manifold to see if theyre sitting tight and that everythings working properly. i dont have LX so i cant really be much help, but the Si's have some issues in the cold, and if your a/c is on at a light your tach can bounce a little bit occasionally...but i dont think thats what your talking about..

02-26-2008, 08:58 PM	#8 (permalink)
FG207Si Senior Member Join Date: Jun 2007 Location: Orlando Fl Posts: 212 iTrader: 1 / 100%	sometimes i have a similar issue when i drive the car for a while. When i apply brake while going to a stop the engine revs up 2 about 1.2-1.3 and then drops down back to normal.

02-27-2008, 09:18 AM	#9 (permalink)
ro.sniper Senior Member Join Date: Jan 2008 Location: T.O. Age: 23 Posts: 412 Razvan iTrader: 0 / 0%	same thing happened on my 99 ex, problem = vacuum hose leaking also power would sometimes cut out on highway, but car turned itself on since it was a manual...

02-28-2008, 08:58 PM	#10 (permalink)
darenufee Junior Member Join Date: Dec 2007 Location: Florida Posts: 14 iTrader: 0 / 0%	OK....2 days later, and still nothing. Car running fine, and no CEL. Pretty sure that eliminates a vacuum leak. Anyone have another idea for a cause?

03-02-2008, 01:32 PM	#11 (permalink)
darenufee Junior Member Join Date: Dec 2007 Location: Florida Posts: 14 iTrader: 0 / 0%	ok now we're at the 150+ miles since the incident. I wish I hadn't cleared the computer because now I have absolutely no clue as to the cause.