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XC90 '02–'15 General Forum for the P2-platform XC90 model |
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Revs hang after hard accelerationViews : 1402 Replies : 10Users Viewing This Thread : |
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Sep 17th, 2018, 13:11 | #1 |
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Revs hang after hard acceleration
Does anyone else get this symptom after acceleration hard on a d5 185? Our car used to suffer a lot from this, until I replaced the swirl flaps but after a few months it happens again? Found myself in a tight spot after the plonker infront slams the brakes on and indicates right at the last min, I had to pull into the left lane and accelerate hard and the revs don’t go lower than 1500rpm if I stop or drive slow. I can pull to the side of the road and it will slowly return to normal but when I tap/press the gas it will return to high revs/idle. To solve the problem I have to turn the car off for around 2 mins with the car locked for it to reset. No faults on Vida either.... any clues?
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2009 V70 R-Design 2.0D SE Sport 2007 XC90 D5 SE Lux 2006 XC90 V8 Executive |
Sep 17th, 2018, 22:15 | #2 | |
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However.... I would expect the gearbox to revert to normal driving mode after say 5-7 seconds of no acceleration, it sounds like you are waiting much longer than this? Tip: Try moving the gear lever over into geartronic, shifting up a gear and then drop back into auto mode. I'm not suggesting this is a fix, it would be interesting to see what it does?
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Sep 17th, 2018, 23:17 | #3 |
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I hate guessing, but you say that there are no DTCs. I would suspect the throttle position sensor. See if you can graph the output.
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Sep 18th, 2018, 01:23 | #4 |
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sounds like oil in the vacuum pipes and the engine is consuming it as if it was diesel
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Sep 18th, 2018, 01:43 | #5 | |
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Sep 18th, 2018, 01:45 | #6 |
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Thanks for the reply, I will hook Vida back up once I get time off work ect... Tbh I should have checked this by now but I’ve not thought of that yet lol. On the to do list.
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2009 V70 R-Design 2.0D SE Sport 2007 XC90 D5 SE Lux 2006 XC90 V8 Executive |
Sep 18th, 2018, 01:47 | #7 |
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Thanks for the reply. I’ve recently changed engine mounts and no oil in them, the tcv ect are all oil free too unless there is something else I’ve missed?
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2009 V70 R-Design 2.0D SE Sport 2007 XC90 D5 SE Lux 2006 XC90 V8 Executive |
Sep 18th, 2018, 12:04 | #8 |
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Good point - though I would suspect that if it is the TPS it's more likely to be a mechanical issues with it as it has dual, redundant circuits.
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2011 XC90 D5 Executive 2003 C70 T5 GT 2012 Ford Ranger XL SC 1977 Triumph Spitfire 1500 1976 Massey Ferguson 135 |
Sep 19th, 2018, 00:14 | #9 | |
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Thanks
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Sep 20th, 2018, 12:00 | #10 |
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It is more correctly called the Accelerator Pedal Position Sensor and it's located at the accelerator pedal.
From VIDA: The function of the accelerator pedal (AP) position sensor is to provide the engine control module (ECM) with information about the position of the accelerator pedal. This information is used by the control module to control engine torque. The sensor consists of a plastic housing with two potentiometers, an AC/DC converter and circuits. The potentiometers are connected to a shaft which is affected by the position of the accelerator pedal (AP). The resistance in the potentiometers changes with the position of the accelerator pedal (AP). The accelerator pedal (AP) position sensor transmits an analog and a digital signal (pulse width modulated (PWM) signal) to the control module. These signals indicate the position of the accelerator pedal (AP). The digital signal is generated by the sensors AC/DC converter. The analog and digital signals are used at the same time by the control module to regulate the fuel volume. The sensor is supplied with 12 V by the system relay via a fuse and is grounded to the body. The digital signal is used in conjunction with the analog signal for accelerator pedal (AP) position sensor diagnostics. The accelerator pedal (AP) position sensor signals can be read using VIDA. A diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects a difference between the analog and digital signals. The engine control module (ECM) then uses a minimal value to ensure the function (limp home). The accelerator pedal (AP) position sensor is located on the accelerator pedal bracket. Good luck.
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