: High Mileage issue?



tbisme
06-05-13, 03:37 PM
Hello,
I have an 09 V with 160K miles on it. The car has been excellent for those miles, but in the past several months, I've had an issue arise with the car and was wondering if you had any suggestions.
Under normal acceleration, the car behaves normally and if I accelerate in any gear up to the redline, using manual shifting, with minimal throttle, it will rev to the redline with no issue.
The problem occurs when I go WOT and then right about the time the car would be upshifting, it suddenly makes a horrible sound, like its taking a deep breath, and the car feels like the traction control has kicked in. It will decelerate like it lost all power, and then after the car shifts, and the rpms drop down, it starts accelerating hard until the next shift approaches.
I've taken it to my local mechanic, who I have much faith in, and he said that he's not sure what's going on. His best guess would be the injectors, but he doesn't want to go through that until he could verify it. He checked the fuel pressure and said that it stays where it's supposed to while the car is moving down the road.
Any suggestions?
Thank You

DCV
06-05-13, 03:57 PM
Did you ever have the throttle body and intake cleaned along with the injectors? Maybe get the fuel filter changed? New air filter....I think you need to tell us what services you had done.

tbisme
06-05-13, 04:08 PM
No, I haven't had the throttle body, intake or injectors cleaned. I thought this model didn't have a fuel filter. Air filter is changed every 50K miles and every required service has been performed on the vehicle.

cruiser68
06-05-13, 04:25 PM
If your trans is starting to slip, you are probably hitting redline and you will hear a funny sound when that happens with no power.

tbisme
06-05-13, 04:40 PM
My mechanic is a transmission specialist and he assures me that it's not the transmission. I've been in vehicles when the trans starts to slip and this is nothing like that. It's a violent let off of the acceleration, then reapplication of power. It's almost like I'm hitting the rev limiter when the power goes.

DCV
06-05-13, 06:52 PM
I had my V serviced and had the BG cleaning done to the TB, injectors, and intake. Definitely made it run better. Deposits build up. Every car has a fuel filter and you would be amazed at the junk that comes out of them after 50k miles. I suggest at a minimum get that replaced.

Trapspeed
06-05-13, 09:36 PM
160K miles! Damn! That's awesome. Gives me great faith in these cars. As for your problem, I'm pointing at the rev limiter kicking in. That's exactly what my car did before the new tires.

vfaninva
06-05-13, 11:20 PM
I have an 09 V with 160K miles on it.

160,000 miles with only routine maintenance. Still running wot. Conratulations, we should all be so fortunate!

SilverrV
06-06-13, 01:45 AM
i think this is a record.

PNBLWZD
06-06-13, 09:22 AM
Sounds like you are possibly hitting the rev limitter, which will cut the ignition at whatever the top RPM is set at in a factory tune until the RPMs come down a bit. Oh and congrats on 160k miles, that's amazing!

neuronbob
06-06-13, 10:33 AM
Congrats on 160k miles. That is incredible!

DiamondWhtV
06-06-13, 11:04 AM
Sounds like a dirty air flow sensor. - Don't use any brake cleaner to clean with or any other chemicals. Always use the spray cleaner designed for the air flow sensor. And congrats on the 160k too.

tbisme
06-06-13, 12:14 PM
thanks for all the input. The first thing my mechanic told me was that he cleaned the air flow sensor, because that is what he suspected, but it made no difference.
I'm going to look into having the internal cleaning performed and see where that leaves me.

bnagel
06-13-13, 01:50 PM
Any update? BTW congrats on the 160K mark!

1997BlackETC
06-13-13, 02:35 PM
Take a scanner to it!!! Any codes stored? Check engine light? But ya, definately do a fuel system cleaning and change the fuel filter, can't hurt even if it does not correct the issue all those must be dirty after those kind of miles. Have you changed the spark plugs? Maybe you have a bad coil? Have em put it on analayzer to check these things. Check the signal off the 02 sensor in the exhaust too, maybe a bad O2 sensor, this is what the computer feedback of the fuel mixure going out the exhaust end. A compression check could not hurt either just to see where your at with that, are you burning any oil?

Jinx
06-13-13, 02:59 PM
I'm far from a mechanic, but if it's running at full strength except during the redline shift at WOT, I wouldn't think general items like injectors and fuel filter would be the culprit, or the WOT run up toward redline would also feel "off."

During a WOT shift in an 09 will the supercharger bypass open? Is it possible it's sticking or not opening/closing at the right time? Might not notice such a problem in light-throttle driving.

tbisme
06-13-13, 03:00 PM
Thanks for the response.
I've kept all of the normal maintenance on the car, so the plugs were done prior to any problems. The thing that was done after the problem occurred was to have the injectors and throttle body cleaned. No codes from the computer. O2 sensors are working.
Here's where I'm at on this. My air cleaner was changed at 150K, so I didn't even check it at first, but after everything else, I checked it and it was "black" from what I'm assuming must be asphalt dust from the massive construction I drive through every day. I replaced the air filter. I also started using almost the entire tank of fuel before filling up, where as I used to stop every afternoon on the way home and top off a 1/3 used tank, just because it was convenient. I read somewhere that if you do this, the ethanol can separate from the gasoline, if it isn't used up in the tank, and this could cause issues with the fuel delivery.
Since doing this, my problem has gone away. I wanted to wait a couple of weeks without any issues before I posted anything, but since you inquired.
The change in my gasoline routine and the air filter replacement are the only things I've done and this seems to have solved the problem.
thanks for everyone's help.

bnagel
06-13-13, 03:49 PM
Great to hear. Not a major issue and still running strong with 160K on her. Nice!

tbisme
06-13-13, 03:54 PM
I did have the rear end replaced at 120K because the carrier bearings were making a lot of noise, but it never failed.
Other than that, it rolls hard every day.

GMX322V S/C
06-14-13, 03:38 AM
This part makes me think the boost bypass valve is opening for some reason:


...like its taking a deep breath, and the car feels like the traction control has kicked in...

Does the boost gauge indicate a loss of boost when this happens?

tbisme
06-14-13, 08:33 AM
I never thought to look at it while it occurred. I think I fixed the problem, and I'm still testing to make sure it doesn't reoccur.


This part makes me think the boost bypass valve is opening for some reason:



Does the boost gauge indicate a loss of boost when this happens?

spearfish25
06-14-13, 09:13 AM
How did you fix it? It does sound like the rev limiter but by 160k miles you'd know if it was.

This car is so quick, when you hit the limiter you hit it HARD. I thought I was going to go through the windshield when I hit the limiter in 2nd this morning.

tbisme
06-14-13, 09:43 AM
My air cleaner was changed at 150K, so I didn't even check it at first, but after everything else, I checked it and it was "black" from what I'm assuming must be asphalt dust from the massive construction I drive through every day. I replaced the air filter. I also started using almost the entire tank of fuel before filling up, where as I used to stop every afternoon on the way home and top off a 1/3 used tank, just because it was convenient. I read somewhere that if you do this, the ethanol can separate from the gasoline, if it isn't used up in the tank, and this could cause issues with the fuel delivery.
Since doing this, my problem has gone away.


How did you fix it? It does sound like the rev limiter but by 160k miles you'd know if it was.

This car is so quick, when you hit the limiter you hit it HARD. I thought I was going to go through the windshield when I hit the limiter in 2nd this morning.

Chrispy
06-14-13, 09:48 AM
I bet the air filter was so dirty the snorkel was sucking shut near redline :)

This happens to guys with the stock airbox and a pulley swap. You just moved the point of restriction with the filthy air filter :)

(That's why LG sells the hard intake tube. With the airbox mod this is less likely to happen but it the snorkel still cavitates even with a K&N and bottom cut out of the airbox.

tbisme
06-14-13, 09:52 AM
Sounds good to me.
I'm just glad to be able to pound away again.