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Self Fix for Long Cranks/Impending HPFP Failure?
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07-07-2010, 11:19 PM | #1 |
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Self Fix for Long Cranks/Impending HPFP Failure?
My 2007 335i coupe didn't have any long cranks in the 3 years I owned it. My 2010 335i coupe has had long cranks multiple times a day starting only 1 month after getting the car. After reading that one of the possible problems could be a priming issue once the car was turned off (hence the annoying gyrating noises the car makes when it turns off), I thought of a possible solution.
For the last few days, I have been revving the engine to about 1500-2000RPM for about 1-2 seconds while turning the car off (I have a manual). The idea is that extra fuel is given to the pump and through the lines to the engine, thus "priming" it. Guess what...not a single long crank since starting this protocol. To put this in perspective, I have had long cranks every time I start the car (2-4 times a day) for 4 months straight. Now, not a single one (when using this protocol). I did forget to use this protocol once and I got a long crank! I'd like to see what happens if other try this protocol. Please report your results. I'll keep all of you updated as well. |
07-07-2010, 11:50 PM | #2 |
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i'll give it a shot.
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7/18/09- I pick up my baby- 2009 E92 335i Xdrive, Space Gray over Coral Red. Premium Pkg, Cold Weather Pkg, M-Sport Pkg, 193Ms, Gloss Black grills, Custom Gloss Black Mirrors, Performance shift and E-brake boot, M3 spoiler, Euro fog switch, gloss black interior tim, Coco-Mats (red/black), H&R coilovers, 19'' Alufelgen SF-71s......
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07-08-2010, 09:23 AM | #3 |
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Reminds me of the old days of carburetors. When it was cold outside, you'd prime the carburetor by revving the engine and instantly shutting of the ignition. It leaves a small amount of fuel in the carburetor ready to go right into the ignition chamber and start the engine the next time you wanted to drive.
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07-08-2010, 09:47 AM | #5 | |
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07-08-2010, 10:05 AM | #6 |
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But let me ask this question. When you put the FOB into the dash and start the electrical system in the car. Shouldn't that action activate the fuel pump and have it prime itself?
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07-08-2010, 10:08 AM | #7 |
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The fuel pump primes itself when you open the door, you can hear it and even see the needle on the fuel gauge move around.
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07-08-2010, 10:08 AM | #8 |
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I believe it actually starts as soon as you unlock the car... you can hear the pump. Most modern cars do this.
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07-08-2010, 10:44 AM | #9 |
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It should do this...but it seems that it is not happening properly, hence one of the proposed reasons for the HPFP failures. At least that is what others on the forums have proposed. With my 1 week worth of data, it seems that I'm on to something...don't know what, but something!
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07-08-2010, 11:27 AM | #10 | |
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07-08-2010, 11:51 AM | #11 | |
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In addition, some people have posted that their performance and MPG is lower with the new software and pumps...I don't want either. One guy posted that he lost 30hp on the dyno with the new pump/software! Plus, I supposedly have the "New" pump! My car was picked up in Feb of this year! So if this "fixes" the underlying reason why the pumps fail, why would you want to kill the pump. Cause we all know it will die at the least opportune time. |
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07-08-2010, 12:20 PM | #12 |
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So as the needle is revving up to 2k rpm with your foot on the gas you stop the engine then? Or when you let the foot off the gas and the needle is in the desired range you kill the engine?
Last edited by 335iseb; 07-08-2010 at 12:27 PM.. |
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07-08-2010, 01:20 PM | #13 |
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^^^
I'd say foot on gas pedal then you kill the engine.
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07-08-2010, 01:34 PM | #14 |
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Foot is on the gas to rev to around 1500-2000 RPM for about a second or two. The start/stop button is pushed while your foot is still on the gas.
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07-08-2010, 07:22 PM | #16 |
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but why not go in for a new pump? long cranks aren't everything... having the pump shut off on you under WOT is what you need to really worry about
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07-08-2010, 10:16 PM | #18 |
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Because 2 different dealerships and 3 different SAs refused to fix anything until the HPFP fails or until the CEL comes on. In 4 months, for better or worse, neither has happened. But it's been almost a week since starting my new protocol and no long cranks (except for the one time I turned on the car and forgot to prime it before turning it off). Gosh, it's like I have a $50K f'ing lawn mower engine or something!!
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07-09-2010, 02:20 AM | #19 | |
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when they didn't change my out and only did a software update, i started driving it hard flooring from 0 to red line every time keeping it in 2nd gear at red line for a while took it about a day to completely shut off and die on me and i finally got the 933 pump GL with yours
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07-09-2010, 02:54 AM | #20 |
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I would NOT prolong the HPFP time using any method. A failing HPFP causes loss of power while driving (mine did) and (my opinion) it can cause misfires, lean condititions due to not enough fuel, etc. It is better to put pressure on BMW by replacing it as soon as possible
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07-09-2010, 11:15 AM | #21 | |
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07-09-2010, 12:41 PM | #22 | |
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