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Old 07-22-2013, 08:48 PM   #1
DylanFulton7
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Question 328Ci Hard Start and Power Loss

Over the last coupe of weeks, intermittently the car will crank over for a few seconds (as opposed to firing right away like normal) when the long cranks happen I experience a serious loss in bottom end power until about 2500 RMP, then all of the power comes back to normal. This seems to only happen in the afternoon or after the car is hot. If I shut the car down for a minute or so the car fires right away and my power is back to normal. After a bit of searching I was convinced that it was my fuel pump so I replaced that today but it's no better, I also replaced my fuel filter about 2 months ago so I can't imagine it would be that. The car isn't throwing any codes when the long cranks happen either so I'm running out of ideas of what the problem could be...
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Last edited by DylanFulton7; 07-22-2013 at 08:50 PM.
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Old 07-22-2013, 09:08 PM   #2
lszlszx
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Check the battery voltage with the OBC after the car starts (when it runs bad), maybe there is a short, or bad connection somewhere causing voltage drop when hot.
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Old 07-22-2013, 09:13 PM   #3
DylanFulton7
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Quote:
Originally Posted by lszlszx View Post
Check the battery voltage with the OBC after the car starts (when it runs bad), maybe there is a short, or bad connection somewhere causing voltage drop when hot.
I'll give it a shot but like I said the CEL doesn't come on when it happens, I guess there's no harm in trying anyway though
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Old 07-22-2013, 09:21 PM   #4
CharlzO
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I have the same exact problem with mine as well, maybe a couple times over the last few weeks. Haven't had a chance to diagnose further, due to other maintenance and time constraints. If you find any information, please share! I'll try to keep vigilant next time and see what I can measure.
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Old 07-22-2013, 09:26 PM   #5
DylanFulton7
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Originally Posted by CharlzO View Post
I have the same exact problem with mine as well, maybe a couple times over the last few weeks. Haven't had a chance to diagnose further, due to other maintenance and time constraints. If you find any information, please share! I'll try to keep vigilant next time and see what I can measure.
Will do! If I find some sort of magic solution (not holding my breath) I'll post it here for a reference.
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Old 07-23-2013, 12:40 PM   #6
CharlzO
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Re: 328Ci Hard Start and Power Loss

I got it to do it again today, immediately checked voltage, and it all was normal. I'm going to try changing out the battery in the next week or two, since its still original. Might as well before it does due either way. I've also done the intake cam sensor about three weeks ago. Haven't done the exhaust side yet. Doing fuel filter this weekend, not expecting much change though since it does run fine after restarting. It is puzzling for sure. Wish I had enough time to scan it today but was running behind.
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Old 07-24-2013, 02:53 PM   #7
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Ok, so to follow up..today, did it after I drove to town. So I shut it off after it was on about a minute, and restarted it. Still seemed to take a little longer to crank, AND, the engine light came on. So, scanned the codes, and...P0340... Intake Cam Position Sensor...so, went back and looked, and I ended up getting the cheap one when I replaced mine, instead of the OEM version. This is where I invoked Homer Simpson.. DOH! Very possible it's given up already, based on other posts about the cheap sensors. Sent the company en e-mail about it, doubt I'll get anywhere, but I'm gonna go ahead and order the OEM one this weekend, and see if that solves it next week. Glad it's not too hard to change out. I'll let ya know if it fixes me up.
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Old 07-25-2013, 12:15 PM   #8
DylanFulton7
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Quote:
Originally Posted by CharlzO View Post
Ok, so to follow up..today, did it after I drove to town. So I shut it off after it was on about a minute, and restarted it. Still seemed to take a little longer to crank, AND, the engine light came on. So, scanned the codes, and...P0340... Intake Cam Position Sensor...so, went back and looked, and I ended up getting the cheap one when I replaced mine, instead of the OEM version. This is where I invoked Homer Simpson.. DOH! Very possible it's given up already, based on other posts about the cheap sensors. Sent the company en e-mail about it, doubt I'll get anywhere, but I'm gonna go ahead and order the OEM one this weekend, and see if that solves it next week. Glad it's not too hard to change out. I'll let ya know if it fixes me up.
Well in light of the codes that you got I went out to the scrap yard this morning and grabbed 3 sensors for $10. I popped it on, started the car and let it warm up then shut it off a few times and it fired up no problem so I took it for a spin around the block and shut it off a few more times and still fired up right away. I'm hoping that this was the fix, if it was I'll order a new sensor from Pelican Parts or something, I just didn't want to dump $100 plus shipping for a "maybe". Anyway for those who may not know how to replace it here's a really good DIY ( http://forum.e46fanatics.com/showthread.php?t=909766 ). So fingers crossed this is the solution
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Old 07-29-2013, 05:48 PM   #9
DylanFulton7
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Still haven't had any problems since installing the new sensor, I'd say that it was definitely the problem. Good luck everyone!
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Old 07-29-2013, 05:52 PM   #10
CharlzO
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Awesome to hear. Mine should be here this weekend, can't wait to swap it out.
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