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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 Wed, Apr-11-2018, 02:26:42 AM   #21
Syfon
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Cleaned the MAF and top TPS a few nights ago. Car won't start at all now (WTH?!).

Just to recap, it has a brand new battery, brand new fuel pump and brand new bottom TPS. I am yet to test the sensor in the throttle pedal.

The thing is, now it won't start. It's cranking over, just not starting. Has fuel in the tank, can hear the fuel pump priming. Coil packs have maybe 10,000km (6,000miles) on them.

Here's the strange thing - last week, it started and drove fine for a bit until it threw the EML light (plus associated codes) again. Got the car home, continued looking at the possible issues of the TPS, throttle actuator, etc. Then last Sunday, started it, let it idle for a bit, then it began idling rough and died. Now it won't start at all.

Can anyone shed some light on this issue?

Is it related to the EML light & associated codes?

I'm completely stumped at the moment

Edit: Scanned for codes with both a hand-held scanner and laptop running BMWLogger; no codes at all.
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Old Wed, Apr-11-2018, 02:39:09 AM   #22
mrgizmo04
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Quote:
Originally Posted by Syfon View Post
Cleaned the MAF and top TPS a few nights ago. Car won't start at all now (WTH?!).

Just to recap, it has a brand new battery, brand new fuel pump and brand new bottom TPS. I am yet to test the sensor in the throttle pedal.

The thing is, now it won't start. It's cranking over, just not starting. Has fuel in the tank, can hear the fuel pump priming. Coil packs have maybe 10,000km (6,000miles) on them.

Here's the strange thing - last week, it started and drove fine for a bit until it threw the EML light (plus associated codes) again. Got the car home, continued looking at the possible issues of the TPS, throttle actuator, etc. Then last Sunday, started it, let it idle for a bit, then it began idling rough and died. Now it won't start at all.

Can anyone shed some light on this issue?

Is it related to the EML light & associated codes?

I'm completely stumped at the moment

Edit: Scanned for codes with both a hand-held scanner and laptop running BMWLogger; no codes at all.
Swap the throttle pedal with your friend to see what it does, but I'm not sure if that is the issue. Have to check air/fuel/spark related components. I don't think blown coils/spark plugs/injectors throw codes.

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'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

Happy to help with VANOS or any other DIY job around NorCal
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Old Wed, Apr-11-2018, 02:40:59 AM   #23
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Quote:
Originally Posted by Syfon View Post
Cleaned the MAF and top TPS a few nights ago. Car won't start at all now (WTH?!).

Just to recap, it has a brand new battery, brand new fuel pump and brand new bottom TPS. I am yet to test the sensor in the throttle pedal.

The thing is, now it won't start. It's cranking over, just not starting. Has fuel in the tank, can hear the fuel pump priming. Coil packs have maybe 10,000km (6,000miles) on them.

Here's the strange thing - last week, it started and drove fine for a bit until it threw the EML light (plus associated codes) again. Got the car home, continued looking at the possible issues of the TPS, throttle actuator, etc. Then last Sunday, started it, let it idle for a bit, then it began idling rough and died. Now it won't start at all.

Can anyone shed some light on this issue?

Is it related to the EML light & associated codes?

I'm completely stumped at the moment

Edit: Scanned for codes with both a hand-held scanner and laptop running BMWLogger; no codes at all.
Also, try unplugging the maf, to see if it starts and runs. These film mafs are tricky.

Sent from my SM-G950U using Tapatalk
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'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

Happy to help with VANOS or any other DIY job around NorCal
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Old Wed, Apr-11-2018, 02:52:20 AM   #24
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Check your fuel pressure. You may hear the pump priming or even running, but I have seen a hose pop off of a new pump assembly inside the unit and just circulate the fuel in the tank.


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Old Wed, Apr-11-2018, 02:58:31 AM   #25
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Check fuse 54(?) for fuel pump in glove box

Sent from my SM-G950U using Tapatalk
__________________
'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

Happy to help with VANOS or any other DIY job around NorCal
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Old Wed, Apr-11-2018, 03:00:50 AM   #26
Syfon
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Quote:
Originally Posted by mrgizmo04 View Post
Also, try unplugging the maf, to see if it starts and runs. These film mafs are tricky.

Sent from my SM-G950U using Tapatalk
Tried this to no avail.

Quote:
Originally Posted by CSLM3Wannabi View Post
Check your fuel pressure. You may hear the pump priming or even running, but I have seen a hose pop off of a new pump assembly inside the unit and just circulate the fuel in the tank.


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Thanks, I'll try this. I can easily pull the pump assembly out of the car to check; takes all of 2 minutes.

I'll also get under the car and check for pressure.

Quote:
Originally Posted by mrgizmo04 View Post
Swap the throttle pedal with your friend to see what it does, but I'm not sure if that is the issue. Have to check air/fuel/spark related components. I don't think blown coils/spark plugs/injectors throw codes.

Sent from my SM-G950U using Tapatalk
As far as I understand, the SMG & 6-speed manual throttle pedals are different and thus not interchangeable?

I'll test mine with a multimeter and see what voltage it produces.

As for the coils/spark, when I drove it last week, and when it was idling this past Sunday morning, it drove and idled smooth (i.e. no misfire).

Now, it simply won't start. It cranks and turns over, just not actually firing up.
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Old Wed, Apr-11-2018, 04:30:32 AM   #27
Syfon
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Quote:
Originally Posted by mrgizmo04 View Post
Check fuse 54(?) for fuel pump in glove box

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Have checked Fuse 54 - it's fine.

I'll also check the fuel pump relay tonight.
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Old Wed, Apr-11-2018, 12:40:52 PM   #28
Syfon
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Checked ALL the fuses and relays tonight; no issue.

Also scanned with INPA; no codes.

Thought it may be low on fuel (even though the fuel gauge showed 1/4), so I put 10 litres in and she still won't start.

I'm going to pull the fuel pump and check to make sure nothing is faulty there. Will also replace the fuel filter and check for fuel pressure while I'm there.

Will report back tomorrow evening...
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Old Wed, Apr-11-2018, 03:05:01 PM   #29
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Quote:
Originally Posted by Syfon View Post
Have checked Fuse 54 - it's fine.

I'll also check the fuel pump relay tonight.

If you can hear the pump priming, that would indicate the fuse is and relay are good. You need to confirm you have fuel pressure.
You should also check for spark. If you dont have a tester, pull a coil out leaving it connected and put a spark plug in it while someone cranks the engine to confirm.
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Old Thu, Apr-12-2018, 12:33:08 AM   #30
Syfon
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Quote:
Originally Posted by CSLM3Wannabi View Post
If you can hear the pump priming, that would indicate the fuse is and relay are good. You need to confirm you have fuel pressure.
You should also check for spark. If you dont have a tester, pull a coil out leaving it connected and put a spark plug in it while someone cranks the engine to confirm.
Yes, can definitely hear the fuel pump priming.

Thanks for the advice. I'll be checking for fuel pressure & spark tonight.
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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)