[zbrit00x]

Hey all, having an issue when I hot start ( car was driven up to temps, turned off and driven 30min-2hr later) my cranks are longer. On 1 occasion it was very long, it killed itself but when I started it again it was instantaneous.

Also idle is a little funny, Idle doesn't really bounce much but I feel the misfires in my seat and hear the popping. No codes are thrown. When I turn the Ac on idle is perfect.

Car has 45k on it (n54 135i), all coil packs were changed as were the spark plugs to step colder plugs ( issue was still occurring prior on oem plugs), valves blasted about 2k miles ago, a couple injectors replaced after diagnosed ad leaking.

No codes are thrown

I can tell car is getting more fuel than usual. Tips go black after a day and ISTA reports -29% adaptation on bank 2 while bank 1 is .3%

Car runs fine at wot.

Anyone got any ideas?

[msjt]

My guess would have been injectors. Did you get new ones or those BS rebuilt ones?

[924er]

Originally Posted by zbrit00x

Hey all, having an issue when I hot start ( car was driven up to temps, turned off and driven 30min-2hr later) my cranks are longer. On 1 occasion it was very long, it killed itself but when I started it again it was instantaneous.

Also idle is a little funny, Idle doesn't really bounce much but I feel the misfires in my seat and hear the popping. No codes are thrown. When I turn the Ac on idle is perfect.

Car has 45k on it (n54 135i), all coil packs were changed as were the spark plugs to step colder plugs ( issue was still occurring prior on oem plugs), valves blasted about 2k miles ago, a couple injectors replaced after diagnosed ad leaking.

No codes are thrown

I can tell car is getting more fuel than usual. Tips go black after a day and ISTA reports -29% adaptation on bank 2 while bank 1 is .3%

Car runs fine at wot.

Anyone got any ideas?

I had the SAME exact issue. The dealer was able to replicate it. They replaced the HPFP and the problem was resolved.

Your issue especially sounds like the fuel pump.

Take it in. I'm sure he still covered under the 10yr/120k mole warranty

Let me know and good luck

[adidoman]

I had the same exact problem a little while back. Long crank on warmer starts and some rough idles. I thought it was my hpfp but it turned out to be my injectors that were causing it.

[Jeff@TopGearSolutions]

It does sound more like the HPFP, more so cause of the long cranks after warm up.

[Jnat]

I'm experiencing the same exact thing for last month or so. I'm not sure but it is fuel related. I richened up my fuel and my starts have smoothed out. I guess with that said it would be more hpfp then injectors using some deductive thinking. I really had leaned out my fuel across the board possibly to a point where it was hurting me, my logs looked ok but I wasn't happy with the smoothness and performance. Let us know but I'm thinking hpfp.

[adidoman]

Originally Posted by Jeff@TopGearSolutions

It does sound more like the HPFP, more so cause of the long cranks after warm up.

That's what I thought when I brought mine in but turned out to be the injectors were going. I think the only way is to test them.

[zbrit00x]

Going to be replacing the injector seals and see if that does anything. I have been told every time they are pulled they should be replaced ( the rubber seal not the decoupling element). Il report back later with my findings

[tjrcs]

Here is a quick way to check whether injectors are the causing issue. (BTW - I had the same problems, and the long cranks were due to leaking injectors)

Pull the plugs and check for signs of gasoline. If you have any leaky injectors, corresponding plugs will have distinctive gasoline smell to it.

[Shamza]

Originally Posted by tjrcs

Here is a quick way to check whether injectors are the causing issue. (BTW - I had the same problems, and the long cranks were due to leaking injectors)

Pull the plugs and check for signs of gasoline. If you have any leaky injectors, corresponding plugs will have distinctive gasoline smell to it.

+1 I had same symptoms and its easy to perform the check. The fact is popping is unburnt fuel.

Are you able to log? You'll be able to see the hpfp pressure on both a cold start compared to warm start.

Process I did on mine, copied from n54tech:
Warmed up engine
Waited 1 hour, pulled each plug
5 was black indicating running slightly rich, however the instant smell of petrol was the obvious give away.
Removed injector and mounted it 180 degrees so it was externally plumped in.
Removed electric connections to all injector and coils
Tied a plastic baggy around external injector and cranked engine.
Instant residue in the bag.
Replaced + coded with INPA = sorted

[Briancanadiano]

Sounds like the exact same issue I was having. Warm starts sometimes wouldn't start. Press the button again and instantaneous. Turned out to be the downpipe fix messing with the fuel trims. Also could be a faulty fuel pump. I got the fuel pump plausibility code though, but not always I would get it.

[zbrit00x]

Mounted it 180 degrees so it was plumped in? I didn't understand this part. Also you removed all electrical connections to all coils and injectors or did you leave the problematic injectors/coil combo plugged in (I'm your case 5).

Thanks

Originally Posted by Shamza

+1 I had same symptoms and its easy to perform the check. The fact is popping is unburnt fuel.

Are you able to log? You'll be able to see the hpfp pressure on both a cold start compared to warm start.

Process I did on mine, copied from n54tech:
Warmed up engine
Waited 1 hour, pulled each plug
5 was black indicating running slightly rich, however the instant smell of petrol was the obvious give away.
Removed injector and mounted it 180 degrees so it was externally plumped in.
Removed electric connections to all injector and coils
Tied a plastic baggy around external injector and cranked engine.
Instant residue in the bag.
Replaced + coded with INPA = sorted

[Shamza]

Originally Posted by zbrit00x

Mounted it 180 degrees so it was plumped in? I didn't understand this part. Also you removed all electrical connections to all coils and injectors or did you leave the problematic injectors/coil combo plugged in (I'm your case 5).

Thanks

Remove the fuel rail and spin it 180, remove the injector you want to test and screw it onto the rail so it's now outside the engine.

You want to remove all connections a par from the one your testing because you do not want to start the car.

[stari335]

I had this same issue 3 weeks ago. It was the HPFP.

[Antetokounmpo]

IMO it sounds like injectors. HPFP causes issues on cold starts from what I remember.

I get occasionally long cranks on warm starts, I'm 99% sure my 6th injector leaks, my HPFP is fine.

[zbrit00x]

Only the long crank issue remains when warm sometimes. Will investigate injectors

[07e92nick]

I hope someone out there sees this post since its been dead for years lol.

I have an 07 E92 335i and Im experiencing similar issues to the guys in this post.
Here the symptoms i'm having. (ALSO: My car is 100% BONE STOCK)

-I have rough idle on cold AND warm starts, the car starts right up every time without long cranks but on occasion the rpms will bounce from 1k-500 in which it almost stalls but never does.
-My exhaust tips turn black after two days of driving or so.
-the exhaust backfires a lot and with a really loud bang every so often.(Like MHD burble tune loud)
-I don't think I smell fuel but i'm not 100% sure
-Spark plugs, New engine air filter, Cleaned Throttle body, Ignition Coils, and a Walnut blast were all done 1000 miles ago
-The car has no warning lights and no codes at all.

Any ideas?

[MysticRob]

If you've read up on this platform you'll see there isn't much left besides FUEL INJECTORS, possibly O2 sensors (rarer).
Also, make your own thread instead of digging up such an old one for the same old issues. Don't make us all slog thru 16 old posts to get to the relevant stuff.

[07e92nick]

Originally Posted by MysticRob

If you've read up on this platform you'll see there isn't much left besides FUEL INJECTORS, possibly O2 sensors (rarer).
Also, make your own thread instead of digging up such an old one for the same old issues. Don't make us all slog thru 16 old posts to get to the relevant stuff.

Excuse me for being new to the forums as well as the N54 platform but, theres really no winning on this forum If I make a new thread I get yelled at for making a new thread on already discussed issues, and if I post on an old one I get yelled at for "making us slog thru SIXTEEN old posts to get to the relevant stuff." also I forgot that when I got the car, the hole in the wall dealer replaced an 02 sensor for me. I appreciate the backhanded reply.

[arkie6]

It sounds like leaking fuel injector(s). What is the index number on your injectors?

Here is a thread I started on this issue and it was resolved by installing new index 12 injectors: https://www.e90post.com/forums/showthread.php?t=1459075

[07e92nick]

Originally Posted by arkie6

It sounds like leaking fuel injector(s). What is the index number on your injectors?

Here is a thread I started on this issue and it was resolved by installing new index 12 injectors: https://www.e90post.com/forums/showthread.php?t=1459075

Thanks for the reply! I have index 8 injectors and reading through that forum it does seem pretty similar to my issue. Im saving up for index 12s and im already more than half way. Thanks again!