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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 Thu, Jan-23-2020, 08:30:38 AM   #1
gateguardian
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Default Will not start on the first attempt only after it has been sitting for hours

This is more of an annoyance than anything else, as I cannot truly pinpoint when it happens and it rarely does.
What I can say as symptoms so far:
Only happens after the car has been driven until it completely warms up/ or has been driven hard. If I turn it off and start it back up again while warm, there's no problems.
After the car has been sitting and has cooled off almost completely (at least 2-3 hours need to pass after it was running) , when I try to start it - will just sit there and turn, without starting. If I turn the key back and try to start it again, will start right up on the 2nd try.
Has no problems starting completely cold (after it has been sitting overnight).
Any idea what this could be? There's no error codes.
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Old Thu, Jan-23-2020, 09:11:20 AM   #2
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Default Re: Will not start on the first attempt only after it has been sitting for hours

might be ur fuel pump with a sticking fuel check valve
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Old Thu, Jan-23-2020, 11:59:13 AM   #3
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Default Re: Will not start on the first attempt only after it has been sitting for hours

how do I go about testing it out?
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Old Thu, Jan-23-2020, 01:31:58 PM   #4
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Default Re: Will not start on the first attempt only after it has been sitting for hours

take out ur fuel pump(be safe and stuff)and blow from the top, it shouldn't blow out form the bottom, an easier way is to hook up a pressure guage while it's parked, if it goes down, then that's ur issue.
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Old Thu, Jan-23-2020, 01:50:32 PM   #5
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Default Re: Will not start on the first attempt only after it has been sitting for hours

I had the same issue (no codes) and was convinced it was fuel pressure. I changed the fuel pump, fuel pressure regulator, fuel filter, injectors, maf, intake timing sensor, exhaust timing sensor, both coolant temp sensors. Turned out to be my smaller mini battery. Went back to the oem battery no issues. The smaller battery never had any issues and cranked strong and had enough juice to start every time. My assumption is the smaller battery didnt give the fuel pump enough voltage to properly prime and bring the pressure all the way up on the first try.
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Old Thu, Jan-23-2020, 02:59:54 PM   #6
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Default Re: Will not start on the first attempt only after it has been sitting for hours

Quote:
Originally Posted by gateguardian View Post
how do I go about testing it out?
You could also try manually priming it with INPA. If it starts after priming then yeah you have an issue with your fuel pump.

I had a similar issue when I installed an aftermarket Walbro fuel pump. Switched to an AEM fuel pump with new PTFE fuel tubing and the issue went away.

If your fuel pump turns out to be the issue and you don't have a need for more fuel then just swap it out with an OEM one.
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Old Thu, Jan-23-2020, 08:31:27 PM   #7
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Default Re: Will not start on the first attempt only after it has been sitting for hours

Might be a dodgy coolant temp sensor. If so, you may soon see codes as the sensor gets worse.
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Old Thu, Jan-23-2020, 08:58:02 PM   #8
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Default Re: Will not start on the first attempt only after it has been sitting for hours

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Originally Posted by gateguardian View Post
how do I go about testing it out?
Connect a fuel pressure gauge to the car and if after a few hours the fuel pressure bleeds to 0 then you know the issue is the pump or FPR.

*Edit, could also be an injector leaking, but that usually also shows as rough running at start-up.
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Old Thu, Jan-23-2020, 09:32:33 PM   #9
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Default Re: Will not start on the first attempt only after it has been sitting for hours

Fuel pump or related, mine had trouble starting on the first try. Had to build pressure after priming a second time.
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Old Thu, Jan-23-2020, 09:47:03 PM   #10
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Default Re: Will not start on the first attempt only after it has been sitting for hours

Easiest way to test this is just turn on the key but not far enough to crank and let it sit for 10-20 seconds to let the fuel pressure build up, then crank, if it starts right up, it is your fuel pressure bleeding down after the car is off, this is a common fuel pump fault. If it still wont start after this, then you may have other issues.
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Discussing Will not start on the first attempt only after it has been sitting for hours 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)