ATB88 I had all the work done as I mentioned above and my car is still hesitating to start on the first try of a cold start. My friend Pat who did the work told me that a buddy of his tracked down the problem to a Vapor Leak Detection Pump. He wasn't getting any codes for it and when he replaced the unit it never happened again. Have you checked your evap system and lines? Maybe thats where we're losing pressure overnight?
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Two years of intermittent hard starts, please help!
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His problem is unique because it happens on warm starts. It's could possibly be vanos related due to what position the cams stop after shutting off the engine the first time,
I think most cold start issues are fuel related but I don't think it could be the ldp since I believe that almost always throws a code and is for emissions purposes anyway.2003.5 MT JB/B - CSL SCHRICK SUPERSPRINT EISENMANN JRZ SWIFT MILLWAY APR ENDLESS BBS/SSR DREXLER KMP SACHS RECARO AR SLON MKRS GSP DMG KARBONIUS CP AUTOSOLUTIONS KOYO
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Originally posted by DropTopKingM3 View PostHere's a video of my cold startup problem. Ive had this issue for years now. So far I've replaced the fuel pump. I'm currently having the fuel filter, fuel pressure regulator, crank, and camshaft sensors replaced.
2003 E46 M3 TiAg/Cinnamon 6MT
2005 E46 330i ZHP Imola/Sand
| Karbonius | Schrick | Supertech | Volk | Recaro | FCM | SuperSprint | Turner | Hyperco | GC | PFC | VAC | OMP | Radium Engineering | MPRacing |
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NorCal DME Programming and Coding Expert
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Originally posted by thegenius46m View Post
Try DMTL pump and vanos solenoid. Both of those when faulty will contribute to similar situations. Read this document on how the car carries out the leak detection test and then try to pay attention to every single start following and see if the issue starts to occur on the second startup when the criteria listed is met. If you do a lot of short trips that criteria can take multiple restarts to be met so what appears "random" isn't really random anymore. I think you have to drive for at least 15-20 minutes for it to count as a cycle.
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Originally posted by DropTopKingM3 View Post
Thank you for your contribution bro. I just had my vanos redone and I replaced the solenoid with one from Beisan. So I will go ahead and try the DMTL pump.2003 E46 M3 TiAg/Cinnamon 6MT
2005 E46 330i ZHP Imola/Sand
| Karbonius | Schrick | Supertech | Volk | Recaro | FCM | SuperSprint | Turner | Hyperco | GC | PFC | VAC | OMP | Radium Engineering | MPRacing |
Instagram:@thegenius46m
NorCal DME Programming and Coding Expert
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Injectors always come with orings. I noticed people keep mentioning orings separately, was there instances where this wasn't the case?
I think I read somewhere here (maybe in this very thread) that clogged injectors were the cause of their hard starts.2003.5 MT JB/B - CSL SCHRICK SUPERSPRINT EISENMANN JRZ SWIFT MILLWAY APR ENDLESS BBS/SSR DREXLER KMP SACHS RECARO AR SLON MKRS GSP DMG KARBONIUS CP AUTOSOLUTIONS KOYO
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Originally posted by jet_dogg View PostInjectors always come with orings. I noticed people keep mentioning orings separately, was there instances where this wasn't the case?
I think I read somewhere here (maybe in this very thread) that clogged injectors were the cause of their hard starts.
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I reached out to a friend of a friend who’s a 25 year BMW dealership tech and showed him my video. This is what he said. I also attached a real oem diagram. I’m guessing it’s 15, 16, and 17. Cheap enough to try it out as the vacuum lines aren’t too expensive. I’m going to order the lines and replace them along with the DMTL pump which arrived today.
I started up my car tonight for the first time in about 2 weeks and it fired up on the first crank. This is puzzling lol.
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Originally posted by DropTopKingM3 View PostI reached out to a friend of a friend who’s a 25 year BMW dealership tech and showed him my video. This is what he said. I also attached a real oem diagram. I’m guessing it’s 15, 16, and 17. Cheap enough to try it out as the vacuum lines aren’t too expensive. I’m going to order the lines and replace them along with the DMTL pump which arrived today.
I started up my car tonight for the first time in about 2 weeks and it fired up on the first crank. This is puzzling lol.2003.5 MT JB/B - CSL SCHRICK SUPERSPRINT EISENMANN JRZ SWIFT MILLWAY APR ENDLESS BBS/SSR DREXLER KMP SACHS RECARO AR SLON MKRS GSP DMG KARBONIUS CP AUTOSOLUTIONS KOYO
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Originally posted by jet_dogg View Post
This is funny, though I didn't have starting issues when I stopped driving the car these were on my list to replace regardless.
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Originally posted by DropTopKingM3 View Post
I agree. I figured since I'm doing a refresh anyway and the car is 20 years old they're probably very brittle and worn out. I may also do a smoke test once I'm done to see if theres anything else that needs addressing.2003.5 MT JB/B - CSL SCHRICK SUPERSPRINT EISENMANN JRZ SWIFT MILLWAY APR ENDLESS BBS/SSR DREXLER KMP SACHS RECARO AR SLON MKRS GSP DMG KARBONIUS CP AUTOSOLUTIONS KOYO
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