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55 Posts
Hello All,
I have an issue as the title says that maybe some of you may be able to answer. I have an 06 S60R that has maybe 120 miles on a completely rebuilt B5244T5 along with all new supporting parts such as turbo, sensors, vacuum lines, ultrasonically cleaned and tested injectors, PCV, plugs and the lot etc.
The problem is the car "hunts" for a lack of better words on idle. The RPM doesn't move up or down at all but it's as if there's a slight, bump or hesitation momentarily that happens a few times per minute. Smooth hum for about 20 seconds and then this hunt for a second, then back to smooth.
So, while running live data monitoring the car idles at a solid 700 RPM, fuel pressure is 44.3 psi, there are no cylinder misses on the cylinder count. The timing advance shows 11-12 degrees solid, but when the hunt happens it shows that the timing will vary from -1 to 26 degrees and then smooth out back to 11-12 degrees. It will do this constantly with the erratic timing during the hunt. My question of course is what could be causing this? What sensor or component tells the computer to adjust?
I've ran a clean no leak smoke test, new OE upstream o2 sensor, MAF cleaned with factory air cleaner. I've ran the car with the VVT selonoids, and MAF disconnected with no change just to see if would stop, no CEL codes, checked sensor connections. I'm sure I'm missing something but what???
When cruising the car its smooth until you get to a stop and then the idle issue. When getting on it a bit I'll hear a slight pop backfire and hesitation.
I am at a loss and or course frustrated when you take every precaution that these cars need on parts etc. just to have issues on something totally brand new. I don't even know what else to look at or replace. Thanks in advance for ANY help!
I have an issue as the title says that maybe some of you may be able to answer. I have an 06 S60R that has maybe 120 miles on a completely rebuilt B5244T5 along with all new supporting parts such as turbo, sensors, vacuum lines, ultrasonically cleaned and tested injectors, PCV, plugs and the lot etc.
The problem is the car "hunts" for a lack of better words on idle. The RPM doesn't move up or down at all but it's as if there's a slight, bump or hesitation momentarily that happens a few times per minute. Smooth hum for about 20 seconds and then this hunt for a second, then back to smooth.
So, while running live data monitoring the car idles at a solid 700 RPM, fuel pressure is 44.3 psi, there are no cylinder misses on the cylinder count. The timing advance shows 11-12 degrees solid, but when the hunt happens it shows that the timing will vary from -1 to 26 degrees and then smooth out back to 11-12 degrees. It will do this constantly with the erratic timing during the hunt. My question of course is what could be causing this? What sensor or component tells the computer to adjust?
I've ran a clean no leak smoke test, new OE upstream o2 sensor, MAF cleaned with factory air cleaner. I've ran the car with the VVT selonoids, and MAF disconnected with no change just to see if would stop, no CEL codes, checked sensor connections. I'm sure I'm missing something but what???
When cruising the car its smooth until you get to a stop and then the idle issue. When getting on it a bit I'll hear a slight pop backfire and hesitation.
I am at a loss and or course frustrated when you take every precaution that these cars need on parts etc. just to have issues on something totally brand new. I don't even know what else to look at or replace. Thanks in advance for ANY help!
