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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, May-16-2019, 10:54:16 PM   #41
yhp2009
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Default Re: Warm Start Problem

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Originally Posted by wolffbimmer View Post
I just don't feel like replacing all the injectors at 40-50 a pop
I think "Mr Injector" refreshes your injectors for $17.50 each. Similar prices in other places.
And if one or two injectors are faulty then buy new bosch injectors for $50
Seemed like a reasonable way to just cross it off the list.

Anyway I plan on doing mine so will let you know if it helps
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Old Fri, May-17-2019, 02:10:47 AM   #42
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Default Re: Warm Start Problem

Completely stupid, but have you checked your purge valve? Gets stuck open and vapor can cause a long crank. Mines fine, but I’ve seen them fail and not throw a code. Can make the car run really rich.

Also the coolant temp sensor can cause a fuel dump/flood engine too if it’s going bad.
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Old Fri, May-17-2019, 04:01:45 PM   #43
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Default Re: Warm Start Problem

I haven't, any procedure for testing it? Is that under the manifold? I have the fuel pressure gauge hooked up now. It's a little wonky as I hold the line different ways the pressure increases/decreases. Anywhere from a little over 40psi to 60psi. I'll watch it for the next couple hours. I had it off before this video for 10-15 minutes and it was still at 40. Another weird thing is when I unplugged the regulator vacuum line I didn't see a crazy spike in fuel pressure. I've seen some folks say a couple psi to 10. I heard a slight audible difference and smelt it be a little richer and idle change but no psi change. Maybe the gauge isn't the greatest.
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Old Fri, May-17-2019, 04:06:01 PM   #44
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Default Re: Warm Start Problem

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Originally Posted by wolffbimmer View Post
I haven't, any procedure for testing it? Is that under the manifold? I have the fuel pressure gauge hooked up now. It's a little wonky as I hold the line different ways the pressure increases/decreases. Anywhere from a little over 40psi to 60psi. I'll watch it for the next couple hours. I had it off before this video for 10-15 minutes and it was still at 40. Another weird thing is when I unplugged the regulator vacuum line I didn't see a crazy spike in fuel pressure. I've seen some folks say a couple psi to 10. I heard a slight audible difference and smelt it be a little richer and idle change but no psi change. Maybe the gauge isn't the greatest.
Yea I tend to not trust gauge readings unless I can reproduce same results from multiple gauges. I'd try another and compare results
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Old Fri, May-17-2019, 04:08:23 PM   #45
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Default Re: Warm Start Problem

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Originally Posted by yhp2009 View Post
Yea I tend to not trust gauge readings unless I can reproduce same results from multiple gauges. I'd try another and compare results
Holding it vs letting it lie on it's own. Either way I have a baseline of the gauge and pressure if it is indeed leaking down a lot over the hours.



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Old Fri, May-17-2019, 04:47:10 PM   #46
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Default Re: Warm Start Problem

it will leak down after a while. doesn't hold pressure constantly.
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Old Fri, May-17-2019, 10:13:50 PM   #47
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Default Re: Warm Start Problem

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it will leak down after a while. doesn't hold pressure constantly.
A few psi correct? I’m just trying to see if anything excessive happens. Especially during a no start to see what the pressure will read.

It leaked down to 25 psi after 5 hours or so. When I started it the pressure raised up because of the prime, it fired up although it did do an ever slight stumble and then smoothed out; this does make me think of a leaky injector but enough for one to make the car not start at all. It does this sometimes after starting when I've tested things and it's sat 4-5 hours. I'll see what pressure is in the morning after sitting overnight. I read in the Chilton manual (e36) that leak down should only be .5 bar which is about 7 psi. It pointed out the fuel pump check valve/fuel pressure regulator/ or injectors.

Bought a set of 30k mi fuel injectors on ebay for $50. Will throw them on and see.

Last edited by wolffbimmer; Sat, May-18-2019 at 02:53:03 AM.
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Old Sun, May-19-2019, 08:13:48 PM   #48
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Default Re: Warm Start Problem

I had the pressure gauge on (can confirm now the gauge is a piece of crap; hooked it up to my tire and it read 6 psi lol) but it still leaked down pretty low from 25 psi to around 10 psi even when I had the return line off the filter/regulator assembly pinched off. This was to rule out the fuel pump check valve/leak down from that end so only the regulator or injectors could be to blame for the leak. With the regulator being new and I even ran the car for several minutes with the vacuum line off to see if any leaking would occur which it didn't. I feel like it has to be injectors. I will update after the injectors are done.
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Old Mon, May-20-2019, 02:08:01 AM   #49
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Default Re: Warm Start Problem

Sub'd
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Old Mon, May-20-2019, 06:22:22 PM   #50
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Default Re: Warm Start Problem

just buy the bosch injectors off fcpeuro, lifetime warranty. much cheaper than the bmw branded ones. (SAME EXACT PART)

I had my old injectors professionally cleaned/rebuilt and verified no leaks (can even get you flow rate on them) that i can sell you if interested. only reason i just said eff it and bought the new ones was they were on sale lol.
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Discussing Warm Start Problem 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)