Hey everyone. This is my first BMW ('89 E30 with M50TUB25 swap, with S50 Cams), so I'm not very familiar with the car. What I'm having is an idle/stalling issue. I've done a lot of research, and yes I've seen this all over the forums, but I think I have a unique circumstance and wanted to double check with people who know these cars before I start throwing more money at parts.
When I bought the car in July it was running very very well. About two weeks after the purchase I noticed a leak in the gas tank when full (rusted out around the pinch weld). I lifted the car and pulled the old tank. I replaced the tank, all the hard fuel lines, all the hard brake lines, fuel pump, and sending unit. I also pulled the carpet and repaired all the rust, so I was welding on the car, and had the DME out. While I was under there I also pulled the expansion tank and replaced the lines there as well. So basically entirely new fuel system from the filler neck to the rail.
Now that I've put the car back down, it is idling rough, and sputtering until it stalls. As the RPM's drop all of the lighting operating off of electrical is dimming out. If I hold the gas down to keep the rev's up, it runs fine.
So far I have:
-Changed oil and filter (before starting the car)
-Replaced the battery (which tested "bad" at Autozone)
-Put in new plugs (old ones were very black and a little wet with fuel when I pulled them)
-Cleaned ICV
-Cleaned MAF
-Checked lines/connections for cracks (including intake boot and hoses coming off of ICV)
-Cleaned connections at battery and grounds everywhere (to make sure the engine is getting full power from the battery)
Does anyone have any thoughts on what would cause a perfectly running car to act this way after sitting for a few months, combined with what I did to it during that time? Any help is greatly appreciated, and just so I don't get flamed with the "search" response, I've spent HOURS reading up on this topic, and all I've found are dead ends.
Thanks for reading.
When I bought the car in July it was running very very well. About two weeks after the purchase I noticed a leak in the gas tank when full (rusted out around the pinch weld). I lifted the car and pulled the old tank. I replaced the tank, all the hard fuel lines, all the hard brake lines, fuel pump, and sending unit. I also pulled the carpet and repaired all the rust, so I was welding on the car, and had the DME out. While I was under there I also pulled the expansion tank and replaced the lines there as well. So basically entirely new fuel system from the filler neck to the rail.
Now that I've put the car back down, it is idling rough, and sputtering until it stalls. As the RPM's drop all of the lighting operating off of electrical is dimming out. If I hold the gas down to keep the rev's up, it runs fine.
So far I have:
-Changed oil and filter (before starting the car)
-Replaced the battery (which tested "bad" at Autozone)
-Put in new plugs (old ones were very black and a little wet with fuel when I pulled them)
-Cleaned ICV
-Cleaned MAF
-Checked lines/connections for cracks (including intake boot and hoses coming off of ICV)
-Cleaned connections at battery and grounds everywhere (to make sure the engine is getting full power from the battery)
Does anyone have any thoughts on what would cause a perfectly running car to act this way after sitting for a few months, combined with what I did to it during that time? Any help is greatly appreciated, and just so I don't get flamed with the "search" response, I've spent HOURS reading up on this topic, and all I've found are dead ends.
Thanks for reading.
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