Can anyone please help me understand when it has been determined that a throttle body has gone bad, what actually has gone bad?
It looks to me from the outside more like a metal box with a wire harness coming out. More mechanical than electrical but I am most likely wrong there. Car has 178k miles on her and I am pretty sure this is the original throttle body.
When a throttle body goes bad.....
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Mr. Detail
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volvolugnut
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The P2 ETM has electric motor control of the throttle blade position. As feedback to the computer, a resistance film is used to sense the blade position and the film wears over time and fails.
Here is the MVS area for discussion of the ETM problem. https://www.matthewsvolvosite.com/volvo ... le-fiasco/
As discussed in the link, a good (although expensive) solution is the non-contact replacement ETM from XeMODeX. Used replacements have to match engine controls, so getting a used one is risky unless carefully selected.
XeMODeX has a flow chart to help determine if your problem is the ETM.
volvolugnut
Here is the MVS area for discussion of the ETM problem. https://www.matthewsvolvosite.com/volvo ... le-fiasco/
As discussed in the link, a good (although expensive) solution is the non-contact replacement ETM from XeMODeX. Used replacements have to match engine controls, so getting a used one is risky unless carefully selected.
XeMODeX has a flow chart to help determine if your problem is the ETM.
volvolugnut
The Fleet:
Volvo: 2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple Volvo parts cars.
Mercedes: 2001 E320, 1973 280, 1974 280C, 1989 300E, 1988 300TE, 1979 300TD, parts cars.
2009 Smart Passion
Ford: 1977 F350, 1964 F150 (2), 1938 Tudor Sedan
Farmall tractors: 1956 400 Diesel, 1946 A
And others.
Volvo: 2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple Volvo parts cars.
Mercedes: 2001 E320, 1973 280, 1974 280C, 1989 300E, 1988 300TE, 1979 300TD, parts cars.
2009 Smart Passion
Ford: 1977 F350, 1964 F150 (2), 1938 Tudor Sedan
Farmall tractors: 1956 400 Diesel, 1946 A
And others.
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dikidera
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Quick question, is this problem still affecting say 2005 models? I recently attempted to steady the RPM at 2000 in neutral(Park mode), it was honestly difficult, as soon as I managed to get to 2000rpm, without moving my foot at all, the rpms ran away higher.
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br0dy519
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My 04 S60 has a Denso throttle body that I have never had issues with. The Bosch throttle body in my 2004 XC70 went bad.... VERY bad. It was stuttering at highway cruise speeds, and finally one day threw a message on the dash "Reduced Engine Performance" and threw a VIDA code for the throttle body itself. Also, sometimes on startup, it would jump to like 4k RPMs then back down erratically.
The ETM (throttle module) is what most people refer to the 2001 Magnetti (or something Italian like that) branded throttle body that was a 100% failure rate. The Bosch (commonly referred to as the TB- throttle body) has a much smaller failure rate, but still has the mechanical component of the butterfly valve. It is still like an electric motor, with an actuator and gears, all of which are possible failure points. I took mine apartment and cleaned it multiple times but never got it ack to life. None of the electronics repair shops offer repair services for the Bosch throttle body.
@dikidera, the problem with your symptoms is that could be evident of a vacuum leak as well. I would suggest doing a good amount of troubleshooting prior to purchasing a new throttle body. Mine was very obviously the issue, but prior to diagnosing I also fixed multiple vacuum leaks. And gave the throttle body a very good cleaning, and verified the wiring harness continuity.
The ETM (throttle module) is what most people refer to the 2001 Magnetti (or something Italian like that) branded throttle body that was a 100% failure rate. The Bosch (commonly referred to as the TB- throttle body) has a much smaller failure rate, but still has the mechanical component of the butterfly valve. It is still like an electric motor, with an actuator and gears, all of which are possible failure points. I took mine apartment and cleaned it multiple times but never got it ack to life. None of the electronics repair shops offer repair services for the Bosch throttle body.
@dikidera, the problem with your symptoms is that could be evident of a vacuum leak as well. I would suggest doing a good amount of troubleshooting prior to purchasing a new throttle body. Mine was very obviously the issue, but prior to diagnosing I also fixed multiple vacuum leaks. And gave the throttle body a very good cleaning, and verified the wiring harness continuity.
04s60 2.4
04xc70 2.5t
04xc70 2.5t
prwood wrote:I wish I had a permanent car repair area that was covered, had a level surface, lighting and fans, a workbench, and tool cabinets. You know,like a garage. Much of my time during the job is spent hauling things up and down the stairs to the basement or in and out of the storage shed, or running back downstairs when I realize I need something else,or taking a break from standing out in the sun,or using flashlights or work lamps when it gets dark.
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abscate
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MTBF on the early ETM is something like 150k miles, earlier if you don’t keep it clean. The ETM is a software driven device so replacement involves both hardware and software matching, so it runs $750-1000, or you can get the Xmodex for $400+100core
The P2 uses a Electronic Throttle actuator which is just hardware. MTBF is quite a bit better..200k plus no software matching is needed, a new Volvo eta is a straight $500
The P2 uses a Electronic Throttle actuator which is just hardware. MTBF is quite a bit better..200k plus no software matching is needed, a new Volvo eta is a straight $500
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
Link to Maintenance record thread
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
Link to Maintenance record thread
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