R53 limp mode - North American Motoring

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R53 limp mode

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  #1  
Old 09-03-2018, 09:30 AM
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R53 limp mode

A few weeks ago my 05 r53 went into limp mode. Check engine light, traction control and emissions light all went on. Revving the car past 2500 rpm causes the car into limp mode. Replaced the map sensor cleaned the throttle body to see if that would work. No luck with that. Anyone know more about this issue before I take it into my local shop? Thanks in advance!
 
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Old 09-03-2018, 10:51 AM
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Had a similar problem - under full throttle acceleration, the car would go into limp mode around 5000 - 5500 RPMs. Turning the car off would usually get me out of limp mode, and going easy on the throttle would keep me out of it. Turned out to be a failing belt tensioner letting the belt slip under high load. Should be easy to check if you have the belt removal tool.
 
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Old 09-03-2018, 11:21 AM
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Check the operation of the speed sensors too. If those fail, the dashboard lights up like a Christmas Tree, and sometimes forces limp mode.

Have you pulled codes?
 
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Old 09-03-2018, 12:38 PM
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Originally Posted by bdubya View Post
Had a similar problem - under full throttle acceleration, the car would go into limp mode around 5000 - 5500 RPMs. Turning the car off would usually get me out of limp mode, and going easy on the throttle would keep me out of it. Turned out to be a failing belt tensioner letting the belt slip under high load. Should be easy to check if you have the belt removal tool.
i donít have the belt removal tool. What exactly should I be looking for?
 
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Old 09-03-2018, 12:40 PM
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Originally Posted by SingleMalt View Post
Check the operation of the speed sensors too. If those fail, the dashboard lights up like a Christmas Tree, and sometimes forces limp mode.

Have you pulled codes?
I havenít had the opportunity to pull codes. My code reader doesnít work for minis. Iíve been on the look out for one.
 
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Old 09-03-2018, 01:35 PM
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Most of your autopart stores will read the codes for free as it is a means to generate some parts sales in certain instances.
 
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Old 09-04-2018, 09:33 AM
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Originally Posted by Diaz_13 View Post
i donít have the belt removal tool. What exactly should I be looking for?
If you can get the belt off, work the tensioner by hand and see if it returns fully to its original position. (I had to give mine an assist for the about the final half-inch of its travel). Replaced it and the problem went away.

Best price I found on the tool was $35 (incl. shipping) on amazon. It's still there ("EWK serpentine belt tool kit supercharged for BMW mini cooper/S...." etc). I leave it in the trunk with a spare belt.
 
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Old 09-04-2018, 10:44 AM
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If you smell burning rubber check the crank pulley. They are so prone to failure they are the most common failure to cause limp mode. If so go with a new ATI damper and you won't have to worry about it happening again.
https://www.waymotorworks.com/super-...ulley-r53.html
 
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Old 09-04-2018, 06:27 PM
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I had an almost identical problem on my 2007 R52 recently. Traction Control, check engine, emissions indicators plus limp mode. Occasionally all the dials would go off the chart as well. Took it to a specialist auto-electrician. Took a couple of days to trace but turned out to be the tachometer triggering a whole bunch of codes and messing with the body controller - sending the trans into limp mode. Replaced the tachometer and everything was back to normal.
 
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Old 09-05-2018, 05:13 PM
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Okay so I went out and bought a code reader. It threw three codes which are the following.




 
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Old 09-05-2018, 08:30 PM
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Those are generic, but I would lean toward the throttle body being bad
https://www.waymotorworks.com/thrott...-cooper-s.html
 
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Old 09-06-2018, 09:50 AM
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Originally Posted by WayMotorWorks View Post
Those are generic, but I would lean toward the throttle body being bad
https://www.waymotorworks.com/thrott...-cooper-s.html
when I remove it to clean it I tested it out. The rubber seal was also replaced the same time. I would let the car reach operating temperature then rev the car to 2500-3500 rpm. With the throttle body visible the doors worked fine. Reved it a few more times then the doors would open about quarter way. Is there a way to diagnose if the throttle body is bad?
 
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Old 09-10-2018, 08:25 PM
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Originally Posted by Diaz_13 View Post
when I remove it to clean it I tested it out. The rubber seal was also replaced the same time. I would let the car reach operating temperature then rev the car to 2500-3500 rpm. With the throttle body visible the doors worked fine. Reved it a few more times then the doors would open about quarter way. Is there a way to diagnose if the throttle body is bad?
It's hard to test as usually it's just one of the sensors in it that fails and causes it to go into limp mode as it can't be correctly controlled by the ECU when the sensor sends the wrong signal.
 
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Old 09-11-2018, 03:08 AM
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Originally Posted by WayMotorWorks View Post
It's hard to test as usually it's just one of the sensors in it that fails and causes it to go into limp mode as it can't be correctly controlled by the ECU when the sensor sends the wrong signal.
I did replace the throttle body over the weekend! Unfortunately it did not resolve my issue. I think Iíve reached the point of just taking it to a shop to get it sorted out.
 
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Old 09-14-2018, 09:13 AM
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Originally Posted by Diaz_13 View Post
I did replace the throttle body over the weekend! Unfortunately it did not resolve my issue. I think Iíve reached the point of just taking it to a shop to get it sorted out.
It says "Pedal Position Sensor"; did you take a look at the pedal itself?
 
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Old 09-14-2018, 03:32 PM
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Originally Posted by Dannorth View Post
It says "Pedal Position Sensor"; did you take a look at the pedal itself?
I did not check. It has since been dropped off.
 
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Old 09-14-2018, 06:35 PM
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Keep us posted please.
 
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Old 09-20-2018, 01:40 PM
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Another vote for the Crank Pulley. Mine did the same thing. Look below the crank pulley for rubber dust and check for burning rubber smell.
 
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