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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Rough idle, loss of power at 94k miles



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      07-09-2018, 02:03 PM   #1
CameroN7887
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Rough idle, loss of power at 94k miles

So lately I've been experiencing a big loss in power but it's been intermittent up until about a week or two ago. Some days I'd touch the pedal barely and it would get up and go easily, and other days it took a lot more gas to get the car to accelerate how it did before. Now recently it has been idling rough, giving me more vibrations in the cabin than I'm used to. The acceleration feels sluggish and like it doesn't pull as hard as it used to high up in the rpms past about 4K. Looking at the repair history the camshaft position sensor got replaced around 25k miles ago, and as far as I know spark plugs and coils haven't been done yet, and I'm bouncing back and forth between spark plugs/coil packs and maybe a problem with the VANOS somewhere? Any help would be greatly appreciated guys!
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      07-16-2018, 06:50 PM   #2
JuniorB
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Here's a thought, I'm doing an upgraded 340 lpfp in my e60, this is difficult from the e90, but what I found is the filter. When I pulled my filter, clear fuel had come out when I pulled it out of the tank, when I brought it to the bench, and blew in, a lot of black crap came out. So I ordered a new one, Bosch fuel filter for $80, well worth it. I found this to be original with the fuel filter, I've never had a fuel issue, power, or mis, I'm doing the upgrade for my motor swap, but found out that, these should be definitely changed at least every 30k. I never thought this would be a lifetime filter.
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      07-29-2018, 05:24 PM   #3
CameroN7887
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I just changed the spark plugs and ignition coils today and for my first time doing that alone on any car it went great, you can barely feel the car idling now which is nice. Seems to run quieter now and everything is a lot smoother! An Indy shop wanted me to do a software update a few weeks back when I went in for a diagnostic so I might go grab that update from them soon
He also wanted to relearn the valvetronic positions and I told him that's what I use ISTA for and he proceeded to crucify me for using such an inferior program
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      07-29-2018, 05:25 PM   #4
CameroN7887
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I did find oil on my 4th cylinders spark plug so guess it's also time for a VCG and new valve cover!
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      07-29-2018, 07:15 PM   #5
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Hopefully it's get sorted out, these n52 are great cars and require minimal upkeep,,unlike the n54. This engine feels great with a fresh maintance.
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      07-29-2018, 07:38 PM   #6
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Quote:
Originally Posted by JuniorB View Post
Hopefully it's get sorted out, these n52 are great cars and require minimal upkeep,,unlike the n54. This engine feels great with a fresh maintance.
I agree these engines are awesome when running well but seems like mine hasn't been able to run since I first got it unfortunately, after driving to work with the new coils and plugs it feels like all my power is gone, and the car is SO slow to rev when I give it some gas, gonna shoot for VANOS solenoids next and clean those to see if anything gets better
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      08-01-2018, 12:18 AM   #7
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Step 1) Scan the car for codes. Don't throw parts at it without having an idea of where the problem lies...
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      08-02-2018, 01:54 AM   #8
CameroN7887
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Quote:
Originally Posted by 6ixSpd View Post
Step 1) Scan the car for codes. Don't throw parts at it without having an idea of where the problem lies...

I've scanned the car multiple times using ISTA with no codes coming up besides a code for an AUC sensor which is for the automatic air quality circulation function as far as I'm concerned, but nothing relating to a misfire or something the car is noticing is wrong. As I was driving home tonight the car was running good with a normal idle and felt very smooth, so I got on an onramp and floored it, got up to about 90 mph, slowed back down and got off the highway about 10 seconds later and stopped at the light and sure as hell the lumpy idle is back, almost like it's misfiring but not giving me any codes, i can feel the engine vibrating much more than usual with the occasional hiccup I guess you could call it, but with no codes. PITA I swear hahaha
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      08-02-2018, 09:29 AM   #9
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If this happens try forcing the car into limp mode by e.g. disconnecting MAF sensor.
Then if the cars runs ok, that means it is not a spark nor fuel issue but a air supply one.
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      08-04-2018, 01:00 AM   #10
CameroN7887
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Quote:
Originally Posted by Saico View Post
If this happens try forcing the car into limp mode by e.g. disconnecting MAF sensor.
Then if the cars runs ok, that means it is not a spark nor fuel issue but a air supply one.

That sounds good I will definitely try that. If it runs okay what could be the possible causes?
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      08-07-2018, 06:40 PM   #11
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Then it can be anything that supplies air or alters its supply - MAF, throtle body, air leak, VANOS, camshaft, camshaft chain... or something with mixture control - lambdas, etc.
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      08-08-2018, 01:21 AM   #12
CameroN7887
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Awesome, I will try that soon. The other day I noticed I was 3/4 full when I checked my oil on the onboard computer, then a few days later after flooring it on a backroad and checking after just because I was curious, I was at 1/2 so I'm burning oil or leaking oil but as far as I know I have no oil leak. I occasionally have a light almost whistling sound or a vacuum leak sound from the engine bay on the valve cover side so I'm assuming it could be the pcv valve in the valve cover is blown, as it might explain me going through half a quart of oil 4K miles into a fresh oil change? I'm hoping it's the pcv valve as that's a cheap-ish repair, but seems challenging as I just did my spark plugs for the first time the other day would unplugging the maf and the car running fine allow the pcv to be a possibility?
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      08-08-2018, 07:11 PM   #13
CameroN7887
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Another note, when the car is idling in park or drive the exhaust seems to tingle and give the little tapping sounds like when you turn a car off, but it happens when it's idling, not sure if that helps but I figured I should throw that in there!
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      Yesterday, 04:47 PM   #14
CameroN7887
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Just to keep the thread updated, I cleaned my VANOS solenoids yesterday and it seemed to clean up my idle more and the tingling while idling in drive seemed to go away, thank you all for your help!
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