Engine stays revved when clutch is in.

Hello,

 

I have a 2005 legacy gt with just under 80K miles. When I press the clutch in and let off the gas, the engine stays revved and slowly drops until I let out the clutch again. It doesn't happen in every gear change and I notice it more in lower gears. Any ideas of what might be causing this?

 

Thanks,

when changing gears, the engine will stay at the same rpm and slowly drop engine speed until you engage the clutch and hit the gas.

 

give more deatils.

The engine will stay at the same RPMs and wont drop to idle engine speed for around 15 seconds.

but your gear will still disengage when the clutch is depressed?

Yes, i can even shift it into neutral while the engine stays revved. It might also be leaking oil from somewhere. I noticed a grease like substance in the undercarriage while doing an oil change recently.

Do the rpms drop to ~1300 before dropping to idle while you are coasting at speed?

Hmmm i might have to look closer to see but when I put in the clutch to shift into 3rd the RPMs will stay at 3,000 while the clutch is in. Greetings from Baltimore BAC, not too far from Rockville.

my 05 2.5i does a very similar thing, I'm not really concerned.

"If it a'nit broke don't fix it."

When I had my manual GT it didi the same. I think the ECU does it to help with rev matching.

 

X

this does not sound normal. i would not dismiss this as rev matching.

^ right, this is not normal. Mine has never done that, even with the LWFW. Push in the clutch, let off the gas, the engine comes right down to idle. At any speed.

 

Sounds like the OP needs to have a lap top plugged in while he drives and watch the logs to see which sensor is hanging up. May be he can find a Tuner to help him with this.

 

I know of a good Tuner down by Maryland International Raceway, but that may be to far for you.

I work just outside of Baltimore. It is normal if the engine should remain at high idle for a second if you push the clutch in at speed. Right around 1300rpm, then, it'll drop to normal idle.

Randomly, is the air conditioner on when this happens? The computer may be trying (a little too hard) to keep the rev's up so it doesn't drop down too low when you press the clutch in and shut the motor off with the air on.

Max,

 

I can actually hear Maryland International Raceway from my parents house. What does a Tuner do? Would I need to take it into his shop?

 

BAC,

 

It'll stay at 3K RPM and the car will jolt forward when I let the clutch out after changing gears. This isn't normal. Im going to check the hydraulic fluid today, do you think that might be causing it?

 

cseagle,

 

I haven't had the AC on too much lately but I'll do some experimenting on my lunch break.

Nope, that sure isn't normal! It likely has nothing to do with the clutch system or transmission.

 

I wonder if you have a vacuum leak somewhere.

 

I wonder if you have a vacuum leak somewhere.

 

ding ding ding

Max,

 

I can actually hear Maryland International Raceway from my parents house. What does a Tuner do? Would I need to take it into his shop?

 

QUOTE]

 

http://www.tempestracing.net/Home.html

Call Joe Simpson and talk with him if you'd like to get more performance out of your ECU. I know he's a big Honda guy. But one of the times at MIR he had a clients 1000hp Supra that he had tuned. So he may be able to plug in his lap top and help you out with more power. Or he may know of a good Subaru Tuner closer to you. You can tell him the guy from CT with the yellow single cam civic sent you. We used to pit next to him at the tracks if we could. His shop is with in a mile of the track.

 

For your current problem, I like said above, check fora simple vacuum leak. There are hoses close to the tmic inlet and kind of behind the Alternator in front of the intake manifold.

 

Another way to find it, if you have a air compressor is to take a pint size paint can, remove the intake hose from the air cleaner box, use the can to plug the hose. Then put a short burst of air into the vacuum line from the blow off valve. Put your thumb over the BOV hose and listen for leaks.

Yep, I was going to suggest a vacuum leak.

are there normal places for this to happen? my new car does the same thing. i know that there is a hose on the top of the engine that pops off under boost often (I glued my down and tip tied it). But are there other places to look?

Max,

 

I can actually hear Maryland International Raceway from my parents house. What does a Tuner do? Would I need to take it into his shop?

 

QUOTE]

 

http://www.tempestracing.net/Home.html

Call Joe Simpson and talk with him if you'd like to get more performance out of your ECU. I know he's a big Honda guy. But one of the times at MIR he had a clients 1000hp Supra that he had tuned. So he may be able to plug in his lap top and help you out with more power. Or he may know of a good Subaru Tuner closer to you. You can tell him the guy from CT with the yellow single cam civic sent you. We used to pit next to him at the tracks if we could. His shop is with in a mile of the track.

 

For your current problem, I like said above, check fora simple vacuum leak. There are hoses close to the tmic inlet and kind of behind the Alternator in front of the intake manifold.

 

Another way to find it, if you have a air compressor is to take a pint size paint can, remove the intake hose from the air cleaner box, use the can to plug the hose. Then put a short burst of air into the vacuum line from the blow off valve. Put your thumb over the BOV hose and listen for leaks.

 

Thanks for the advice, I might have to get someone whos a little more handy under the hood to help me though.

 

Would a vacuum leak also cause an oil leak?

BOV/BPV stuck closed? When you are stopped at idle and rev your engine, do your rps drop back down normal?

If I am stopped and blip the gas to 1500-1900 rpms it revs and recovers. If I rev the motor up to 3k rpms it just lingers or floats its way down to 800 rpms (AP set idle).

Mine is pretty similar. Although it will rev and drop normally most times.

 

 

 

Would a vacuum leak also cause an oil leak?

 

 

 

No

 

If the PCV system is plugged that may, but that would be obvious.

Do you guy's have automatics or manual transmissions ?

 

Auto's I think have more vacuum lines.

 

Zip ties are good to use on the vacuum hoses. There is a hose that is under/in front of the tmic that may pop off too.

 

It is very easy to remove the tmic and zip tie the lines. You may need a little liquid dish soap on the inside of the throttle body hose to make it slip on the tmic neck for easy re-install.