Maybe I just never noticed this before..
Thread Starter
Registered User
Joined: Jun 2008
Posts: 1,808
From: San Jose, CA
Car Info: 2015 WRX
Maybe I just never noticed this before..
Sorry for the noob question, but my engine seems to be doing something new, or at least it's gotten more noticeable.
Let's say I'm driving in 5th gear at around 2750 RPM. If I press down on the gas to accelerate (let's say I depress the pedal completely), at about 3000 RPM the engine sort of .. "hiccups" once and starts to feel more sluggish, and then at about 3500-3750 RPM it kicks back in with another hiccup and there's a surge in engine power.
I'm pretty sure the second hiccup is the turbo engaging, but it's the first one that concerns me. Thoughts?
Let's say I'm driving in 5th gear at around 2750 RPM. If I press down on the gas to accelerate (let's say I depress the pedal completely), at about 3000 RPM the engine sort of .. "hiccups" once and starts to feel more sluggish, and then at about 3500-3750 RPM it kicks back in with another hiccup and there's a surge in engine power.
I'm pretty sure the second hiccup is the turbo engaging, but it's the first one that concerns me. Thoughts?
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Joined: May 2005
Posts: 22,776
From: Sunnyvale, CA
Car Info: '13 BRZ Limited / '02 WRX
May be similar to a problem I had. The cause was never found, but the symptoms went away with a tune. I can ride along with you sometime after the weekend if you want.
What my problem was when I'd accelerate more than 50% throttle the RPM's would increase by about 500, then kind of pause, and then increase another 500, pause, and so on to about 5k RPM.
Dealership said it was the transmission "protecting itself" from the then stock engine. Modded the car and tuned it and the problem went away. I ran untuned for about a week after swapping from the automatic tranny to the manual, and the symptoms were back.
Anyways, if you want me to ride along to see if is the same issue, get my number from Danielle. I'll also see if I can get my AP cable working with my laptop again so we can do some logging and see if any values are off.
What my problem was when I'd accelerate more than 50% throttle the RPM's would increase by about 500, then kind of pause, and then increase another 500, pause, and so on to about 5k RPM.
Dealership said it was the transmission "protecting itself" from the then stock engine. Modded the car and tuned it and the problem went away. I ran untuned for about a week after swapping from the automatic tranny to the manual, and the symptoms were back.
Anyways, if you want me to ride along to see if is the same issue, get my number from Danielle. I'll also see if I can get my AP cable working with my laptop again so we can do some logging and see if any values are off.
Last edited by VRT MBasile; Sep 4, 2009 at 03:58 PM.
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Joined: Jun 2004
Posts: 52,306
From: Palo Alto, CA
Car Info: Something german
May be similar to a problem I had. The cause was never found, but the symptoms went away with a tune. I can ride along with you sometime after the weekend if you want.
What my problem was when I'd accelerate more than 50% throttle the RPM's would increase by about 500, then kind of pause, and then increase another 500, pause, and so on to about 5k RPM.
Dealership said it was the transmission "protecting itself" from the then stock engine. Modded the car and tuned it and the problem went away. I ran untuned for about a week after swapping from the automatic tranny to the manual, and the symptoms were back.
Anyways, if you want me to ride along to see if is the same issue, get my number from Danielle. I'll also see if I can get my AP cable working with my laptop again so we can do some logging and see if any values are off.
What my problem was when I'd accelerate more than 50% throttle the RPM's would increase by about 500, then kind of pause, and then increase another 500, pause, and so on to about 5k RPM.
Dealership said it was the transmission "protecting itself" from the then stock engine. Modded the car and tuned it and the problem went away. I ran untuned for about a week after swapping from the automatic tranny to the manual, and the symptoms were back.
Anyways, if you want me to ride along to see if is the same issue, get my number from Danielle. I'll also see if I can get my AP cable working with my laptop again so we can do some logging and see if any values are off.
Thread Starter
Registered User
Joined: Jun 2008
Posts: 1,808
From: San Jose, CA
Car Info: 2015 WRX
May be similar to a problem I had. The cause was never found, but the symptoms went away with a tune. I can ride along with you sometime after the weekend if you want.
What my problem was when I'd accelerate more than 50% throttle the RPM's would increase by about 500, then kind of pause, and then increase another 500, pause, and so on to about 5k RPM.
Dealership said it was the transmission "protecting itself" from the then stock engine. Modded the car and tuned it and the problem went away. I ran untuned for about a week after swapping from the automatic tranny to the manual, and the symptoms were back.
Anyways, if you want me to ride along to see if is the same issue, get my number from Danielle. I'll also see if I can get my AP cable working with my laptop again so we can do some logging and see if any values are off.
What my problem was when I'd accelerate more than 50% throttle the RPM's would increase by about 500, then kind of pause, and then increase another 500, pause, and so on to about 5k RPM.
Dealership said it was the transmission "protecting itself" from the then stock engine. Modded the car and tuned it and the problem went away. I ran untuned for about a week after swapping from the automatic tranny to the manual, and the symptoms were back.
Anyways, if you want me to ride along to see if is the same issue, get my number from Danielle. I'll also see if I can get my AP cable working with my laptop again so we can do some logging and see if any values are off.
Registered User
Joined: Aug 2008
Posts: 623
From: Manhattan, NY
Car Info: The 4 Train
My Audi did that twice (yes, I realize not the same car but might give you ideas of places to start)
First time: Vacuum hoses were leaking.
Second time: Needed new O2 sensor.
..... I think.... that car had so many problems it is sometimes hard for me to remember what fixed each problem.
Also, I never noticed it when driving your car before (granted I always tried to behave myself when driving your car so I didn't ever really push it hard
), but I don't remember it doing that when you were driving either.
First time: Vacuum hoses were leaking.
Second time: Needed new O2 sensor.
..... I think.... that car had so many problems it is sometimes hard for me to remember what fixed each problem.
Also, I never noticed it when driving your car before (granted I always tried to behave myself when driving your car so I didn't ever really push it hard
), but I don't remember it doing that when you were driving either.
Last edited by danielliez; Sep 4, 2009 at 11:29 PM.
Registered User
Joined: Aug 2008
Posts: 623
From: Manhattan, NY
Car Info: The 4 Train
I think you should get a tune. i'd guess its fuel system related, unless something is going to bite the dust on your car. If you take it to someone like ED @eq tuning, he'd probably be the best to diagnose or notice any abnormality, rather than just tune your car and not try to find out whats going on. He's really good at that stuff.
Last edited by slow04wrx; Sep 4, 2009 at 11:30 PM.