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HOT start misfire
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05-25-2019, 08:45 AM | #1 |
Private First Class
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HOT start misfire
Been reading and reading and searching all over the internet to see if anyone else has a problem that fits mine exactly, and I've found one that seems to be very very close to what's going on with my car here which he resolved with injectors. I really would like some input before I purchase injectors based off of one guy's post.
If the car is full operating temperature and I park. Shut down. And turn it back on, it goes as follows: Fires up in one or two cranks - very fast RPMs stable out to ~800-850 after the engine fired - normal operation - smooth idle 7-10 seconds of smooth idling at ~800-850 goes by and the RPMs slowly fall and the engine starts to feel shaky RPMs fall to 450-550 fluctuating with rough misfires for about 7 seconds Engine seems to finally catch its breath RPMs then SURGE way up to 1000 maybe even 1100 smoothly and then smoothly fall down to normal 650 RPM idle Engine runs great. No hiccups no stutters no misfires after the initial stumbling Wide open throttle pulls hard and smooth. Normal driving around town is smooth. The reason I struggle to believe this is a leaky injector issue is because I can shut the car off and literally 3 seconds later, turn the car on, it does this. Every. Single. Time. I don't get a gassy smell. I don't get white smoke from pipes. I get pretty good gas mileage (24mpg) too. Last edited by BadContrakt; 05-25-2019 at 09:20 AM.. |
05-25-2019, 02:49 PM | #2 |
Lieutenant
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Drives: 2008 BMW 335i sedan
Join Date: Aug 2014
Location: Russellville, AR
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Here is another thread on the subject that I started:
https://www.e90post.com/forums/showthread.php?t=1459075 |
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05-28-2019, 01:14 PM | #3 | |
Private First Class
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Rep 135
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Quote:
I'll be sure to report back here for documentation purposes |
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06-10-2019, 09:59 AM | #4 |
Private First Class
73
Rep 135
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Update:
Injectors got here and I was about to replace all 6. Before-hand though I wanted to double check my downpipe job before I replaced them, as, all of this started after replacing downpipes. Turns out the BMW master technician I had with me (sarcasm only slightly intended) swapped my O2 sensors front to back and back to front. Swapped the plugs and no symptoms and beautiful cold start idle and hot start idle. 100% fixed. I'll be swiftly returning those injectors, clips, and seals and saving almost 1400 dollars. Turns out my intuition was correct. I didn't really believe this was an injector issue. Dodged that bullet for now! Last edited by BadContrakt; 06-10-2019 at 10:14 AM.. |
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