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#1
05-09-2023, 08:42 AM
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random misfire when first applying throttle 3.0
i have a 2001 3.0 5spd with 235k on it. just recently it started doing this weird stutter (misfire) when first applying throttle to accelerate from a stop and after shifting gears. it is no consistent and after the quick stutter and drives and cruises like normal. i thought at first it was load related but i am able to replicate it at a complete stop and in neutral by just give it a little gas. doesnt happen every time though and has not thrown any misfire codes. current codes are for a bad secondary air pump and for the O2 sensors. it had a fuel pressure code for low fuel but that self cleared and hasnt been back after 200 miles of driving. i have emptied a entire can of brake clean around the intake and noticed no change in idle (i made sure it was the flammable stuff) i am stumped on where to look next. plugs were done 10,000 miles ago and still look good, i dont hear any obvious vacuum leaks and found none with the brake clean. any ideas on where to look next? i do have a oil leak under the intake somewhere so i am planning on pulling the intake to investigate and replace stuff so if anyone has a list of items i should replace once the intake is off please let me know. thanks for any help
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#3
05-09-2023, 06:46 PM
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What caused the low fuel pressure code? Others on this forum have suggested that fuel pumps can fail gradually. I have never heard of that happening but it's come up in suggestions on this forum several times that I've seen.
What are the O2 sensor codes as well... and how are you pulling codes, Foxwell? PA Soft? PA soft always throws an O2 short circuit code for me, but it's not a real code, and doesn't show up in my Foxwell.
__________________
2003 3.0 5MT Topasblau Purchased in 2016 and sold in 2024 2012 35d Platingrau
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#4
05-10-2023, 07:06 AM
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Quote:
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#6
05-10-2023, 07:07 AM
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Quote:
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#7
05-10-2023, 08:19 AM
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Could be many things.
As a first step, I would measure fuel pressure at the rail at idle and while driving. Needs to be close to 50 psi steady. As a second, I would do a proper smoke test (not a fluid pump/cigar job) with good smoke and pressure for 10 minutes.. The flammable brake cleaner test for leaks won’t work as the DME will adjust before you hear a difference. Last edited by Effduration; 07-14-2023 at 07:57 AM.
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#8
05-10-2023, 09:30 AM
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I would suggest getting a proper BMW scan tool as the first step, since he hasn't done that yet. Especially if the OBDII codes for the O2 sensors are real.
__________________
2003 3.0 5MT Topasblau Purchased in 2016 and sold in 2024 2012 35d Platingrau
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#9
05-14-2023, 08:22 AM
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using inpa (its in german so using phone to translate) we got code
241 which seems to be cyl 4 misfire 142 module error DMTL 190 and 191 which is oxygen sensor 1 and 2 39 BLS-BTS plausibility 153 lambda probe voltage mach-KAT probe i drove it at highway speeds while towing about 100 miles a couple days ago. still did the stumble occasionally on initial tip in of the throttle when pulling from a stop or shifting gears but after that it was smooth sailing
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