Intermittent Issue (Car dying)
#1
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Ok, so I swapped out my fuel pump and "fixed" (maybe, hence the air quotes) the A/C in my car and now I'm having weird intermittent issues that don't make any sense.
Specifically, randomly after about 3 minutes or so, my car will just lose power and die, and there's not a damn thing I can do about it. Throttle does nothing. It lasts for a few seconds, and even power cycling doesn't fix it. I have to wait a bit, crank for a bit, stop, then start it again and boom. It acts like nothing ever happened. This is consistently happening about every 3-5 minutes. My first thought is fuel pump as I just installed one, but I purchased the DW200 from Supermiata and I didn't think those were prone to failure. However, my unit had clearly been opened before (even though I was supposed to be buying a "new" product), so I really have no clue. (edit: pretty sure this is the pump. Swapping back to my Walbro 255 to see if that fixes it)
I've got a data log of the event happening in my driveway. It doesn't seem to matter what I'm doing as just leaving it idling can cause it to die, so I'm at a loss. The only settings I was playing with were idle related settings to get the A/C to idle up properly, but that's proving to be a nightmare in itself as my A/C condenser doesn't seem to be generating a consistent load at all.
I just took a generic datalog of whatever was offered. I'm still learning my way around megasquirt, so if there's a way I can improve my logs to capture whatever data is needed for this, let me know. Looking at the raw data, there doesn't seem to be much here to my nooby eyes.
Specifically, randomly after about 3 minutes or so, my car will just lose power and die, and there's not a damn thing I can do about it. Throttle does nothing. It lasts for a few seconds, and even power cycling doesn't fix it. I have to wait a bit, crank for a bit, stop, then start it again and boom. It acts like nothing ever happened. This is consistently happening about every 3-5 minutes. My first thought is fuel pump as I just installed one, but I purchased the DW200 from Supermiata and I didn't think those were prone to failure. However, my unit had clearly been opened before (even though I was supposed to be buying a "new" product), so I really have no clue. (edit: pretty sure this is the pump. Swapping back to my Walbro 255 to see if that fixes it)
I've got a data log of the event happening in my driveway. It doesn't seem to matter what I'm doing as just leaving it idling can cause it to die, so I'm at a loss. The only settings I was playing with were idle related settings to get the A/C to idle up properly, but that's proving to be a nightmare in itself as my A/C condenser doesn't seem to be generating a consistent load at all.
I just took a generic datalog of whatever was offered. I'm still learning my way around megasquirt, so if there's a way I can improve my logs to capture whatever data is needed for this, let me know. Looking at the raw data, there doesn't seem to be much here to my nooby eyes.
Last edited by CasualSpeed; 09-11-2019 at 07:28 PM.
#2
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Alright, now this is definitely outside the realm of ECU/tuning, as I do believe it's the new pump issue. Reached out to supermiata, and was just told a blanket "prove it" response, which is fair. Now I'm stuck trying to figure out how to "prove it" when this seems like a fairly straightforward cause/effect. Swapped fuel pumps and no other fueling changes, and now I'm running into fueling issues. I'm going to swap back to my noisy Walbro 255 and see if this goes away.
#5
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I just took a generic datalog of whatever was offered. I'm still learning my way around megasquirt, so if there's a way I can improve my logs to capture whatever data is needed for this, let me know. Looking at the raw data, there doesn't seem to be much here to my nooby eyes.
#12
Elite Member
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (2)
Join Date: Jun 2009
Location: Istanbul, Turkey
Posts: 3,222
Total Cats: 1,701
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I'd be curious to see the charging voltage when the car is acting up.
I know it will be in the log, but hooking up your voltmeter to B+ and ground and observing is pretty easy.
A pretty remote possibility, but one of the diodes may have fried in your alternator.
Just a thought.
I know it will be in the log, but hooking up your voltmeter to B+ and ground and observing is pretty easy.
A pretty remote possibility, but one of the diodes may have fried in your alternator.
Just a thought.
#14
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I think your turbo-encabulator isn't correcting side-fumbles :/ replace the unit.
Seriously post some logs mate, we have absolutely no idea what is going on if you don't.
If you post logs we might be able to say, hey look your fuel stopped at the same time, because your crank signal stopped coming through.
Jump your relay or just hard wire your pump to 12v and get us a log.
Seriously post some logs mate, we have absolutely no idea what is going on if you don't.
If you post logs we might be able to say, hey look your fuel stopped at the same time, because your crank signal stopped coming through.
Jump your relay or just hard wire your pump to 12v and get us a log.
Thread
Thread Starter
Forum
Replies
Last Post
andyfloyd
Engine Performance
24
05-09-2019 02:17 PM
LukeG
DIY Turbo Discussion
20
08-15-2017 01:10 PM