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BMW 3-Series (E90 E92) Forum
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335d Excessive Idle Smoke until up to Temperature
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| 07-22-2019, 11:38 AM | #1 |
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335d Excessive Idle Smoke until up to Temperature
Hello All, thought it would make sense to start a new thread rather than highjack someone elses ... I recently bought a 335d on 235k miles, great condition, full history etc. Was owned by a UK member on here and he used it to commute 40k a year to work and back
 From my understanding, it ran a DMS Automotive map for years, then had its DPF (Cat still in place?) and EGR/EGR cooler removed in November last year (& map adjusted to suit) as per the picture below:  Untitled by Sir_Dave, on Flickr  Untitled by Sir_Dave, on Flickr The crux is, it drives perfectly and pulls like a train when up temp, ie above 89oC, but below that is had a "misfire/rev up" on idle and smokes like a chimney. Initially i disconnected the MAF and the car ran far better/with no revup/smoke, so i bought a new MAF. When fitted, the revup/smoke issue came straight back. Doh  Done some basic data logging with a piece of paper & Carly: Initial Cold start MAF on steady 40/41, jumps to 80 when revs increase, coolant in the 30's, lots of smoke. MAF on steady 40/41, jumps to 80 when revs increase, coolant in the 65's, lots of smoke. MAF on steady 40/41, coolant 88, lots of smoke. MAF on steady 40/41, coolant 91, lots of smoke. MAF on steady 45, coolant 88, lots of smoke. MAF on steady 50, coolant 95, minimal/no smoke. MAF on steady 60, coolant 95, minimal/no smoke. MAF on steady 50/52, coolant 92, minimal/no smoke. MAF on steady 60/62, coolant 93, minimal/no smoke. MAF on steady 51/52, coolant 94, minimal/no smoke. Warm start MAF on steady 54/55, coolant 83, lots of smoke. MAF on steady 60, coolant 95, minimal/no smoke. No smoke whatsoever with MAF unplugged, also no fault codes. ----------------- Did some more logging (with INPA) today, removed the engine cover to have access to the EGR etc: Nominal/Actual charge air pressue and rail pressure stay the same throughout. ----------------- Coolant up to 88oC EGR unplugged, MAF plugged in - EGR ASV forwards, MAF nominal 315 mg/hub, with actual of 320, lots of smoke EGR unplugged, MAF unplugged - EGR ASV forwards, MAF nominal 372 mg/hub, with actual of 495, less smoke, but still there EGR plugged in, MAF unplugged - EGR ASV forward, MAF nominal 430 mg/hub, with actual of 490+, no smoke EGR plugged in, MAF plugged in - EGR ASV initially backwards, then rocking forwards/backwards when it misfires/revsup, MAF nominal 315 mg/hub, with actual of 320, lots of smoke ----------------- Coolant over 89oC EGR unplugged, MAF plugged in - EGR ASV forwards, MAF nominal 495 mg/hub, with actual of 495, no smoke EGR plugged in, MAF plugged in - EGR ASV forwards, MAF nominal 495 mg/hub, with actual of 495, no smoke ----------------- To me it seems like there is something over-fueling related going on below 88oC, and/or if the MAF is reading sub 49(0)? I was also under the impression that when the EGR is mapped out, it stays put, so shouldnt be moving around all over the place?! Your thoughts are much appreciated  Last edited by Sir_Dave; 07-22-2019 at 11:44 AM.. |
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