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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Apr-14-2018, 03:06:34 PM   #31
CSLM3Wannabi
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Update?


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Old Sun, Apr-15-2018, 02:20:12 PM   #32
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

not trying to be a dick but have you recently taken off the intake manifold
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Old Sun, Apr-15-2018, 06:31:45 PM   #33
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Sometimes the ecu connectors are dirty. I had a similar issue. Changed all sensors to no avail. Unplugged all connectors from the dme. Sprayed electrical cleaner on them and on the sme pins. Compressed air and waited for them to dry off. Reconnected. No issues since. That was a year ago.
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Old Mon, Apr-16-2018, 01:22:49 AM   #34
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

[quote=CSLM3Wannabi;1067809427]Update?
Quote:
Originally Posted by CSLM3Wannabi View Post
Update?


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Only had a few hours Saturday to do some work; removed the intake manifold and tested a new crank speed position sensor, cleaned the ICV and all throttle bodies.

Checked for spark - it has spark.

I'm sending the car to a shop tomorrow or Wednesday - see what they say.

Quote:
Originally Posted by lilbimmerboy View Post
not trying to be a dick but have you recently taken off the intake manifold
Yes, I removed it to replace the bottom TSP and clean the ICV & throttle bodies.

Quote:
Originally Posted by HassanEido View Post
Sometimes the ecu connectors are dirty. I had a similar issue. Changed all sensors to no avail. Unplugged all connectors from the dme. Sprayed electrical cleaner on them and on the sme pins. Compressed air and waited for them to dry off. Reconnected. No issues since. That was a year ago.
Thanks for your input, I'll check these tonight.
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Old Mon, Apr-16-2018, 02:41:27 AM   #35
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

[quote=Syfon;1067809794]
Quote:
Originally Posted by CSLM3Wannabi View Post
Update?


Only had a few hours Saturday to do some work; removed the intake manifold and tested a new crank speed position sensor, cleaned the ICV and all throttle bodies.

Checked for spark - it has spark.

If it has spark, it wouldn't be a crank position sensor issue.
You still cannot get it to start, correct?
You need to check fuel pressure. You may even have a clogged fuel filter.




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Old Mon, Apr-16-2018, 03:47:05 AM   #36
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

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Originally Posted by CSLM3Wannabi View Post


If it has spark, it wouldn't be a crank position sensor issue.
You still cannot get it to start, correct?
You need to check fuel pressure. You may even have a clogged fuel filter.




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Correct, I still can't get it started.

Tonight, if I have time after work etc, I'll replace the fuel filter and check for fuel pressure. Hopefully it is as simple as this.

Will report back tomorrow.
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Old Mon, Apr-16-2018, 06:00:02 AM   #37
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

It's always as "simple" as correct amount of air/fuel and a spark...so def check fuel delivery and operation of pump/regulator/injectors.

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Old Wed, Apr-18-2018, 12:15:50 AM   #38
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Swapped the fuel filter for a brand new unit last night. The old fuel filter was definitely blocked - couldn't blow through it and bits of the filter element itself came out.

After installing the new fuel filter and intake plenum, started her up and went for a 15min drive. Car drove perfectly, idled perfectly.

Everything was fixed, or so I thought.

Started the car this morning to take it into work, car idled perfectly for a few minutes then began hunting on idle then died. Now it won't start again.

It's worth noting, when I removed the old fuel filter, a few pieces of the actual filter element came out of the filter, however only fuel came out of the fuel line from the pressure regulator forward.

My guess is due to the old filter deteriorating, bits of it have been pushed through the fuel line and maybe some/all injectors are blocked?

Edit: To recap, brand new parts are Walbro 255 fuel pump, oem fuel filter, bottom TPS and battery. Have checked the crank speed position sensor, and cleaned all relevant electrical contacts in the engine bay with electrical contact cleaner. Have also cleaned the MAF.

Last edited by Syfon; Wed, Apr-18-2018 at 12:47:45 AM.
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Old Thu, Apr-19-2018, 12:50:07 AM   #39
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Update: Started the car when I arrived home from work yesterday. Idled and drove fine.

Scanned for codes and got the following -
  • DME: Signal, crankshaft sensor
  • Voltage Supply, EWS3 control module
  • KOM Instrument cluster - KOMBI: No CAN indetification (DME)

Regarding the crankshaft sensor, I sourced one (used) through a friend and tested them both with a multi-meter. Both sensor showed the exact same resistance.

Have since cleared all the codes. Drove the car into work this morning without any hiccups.

Can anyone shed some light on the EWS and KOMBI codes listed above?

Cheers
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Old Thu, Apr-19-2018, 01:03:47 AM   #40
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Quote:
Originally Posted by Syfon View Post
Update: Started the car when I arrived home from work yesterday. Idled and drove fine.



Scanned for codes and got the following -


  • DME: Signal, crankshaft sensor
  • Voltage Supply, EWS3 control module
  • KOM Instrument cluster - KOMBI: No CAN indetification (DME)



Regarding the crankshaft sensor, I sourced one (used) through a friend and tested them both with a multi-meter. Both sensor showed the exact same resistance.



Have since cleared all the codes. Drove the car into work this morning without any hiccups.



Can anyone shed some light on the EWS and KOMBI codes listed above?



Cheers


Just reset and let it go. Looks like low voltage errors.


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Discussing Throttle position problems, codes P0121 and P1637, new throttle actuator + sensors an in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)