Hey guys, I'm having some issues with my s50 swap and wanted to see if I could get some opinions on where to go next. The idle is rough when cold, around 450-500 rpm, and will stall and die unless I constantly give it some gas. Once it warms up it will idle about 80% correctly, and fluctuate between 750 rpm-1k rpm. When the fan kicks on the idle will drop down to around 650 rpm, and it sounds like it's missing and the idle will be rough.
Bit of background:
The car is a 1986 325e
Did the swap a couple years ago, and it would occasionally idle odd, but the car sat for a couple years and the idle seems worse.
Before the swap, the previous owner of the motor installed the following new parts: crank seals, cam & crank position o-rings, water temp sensor, timing chain guide rails, timing chain tensioner, new thermostat & housing, water pump, ARP head bolts, main belt, spark plugs, and knock sensors.
Running a 413 red label dme with correct tune.
New MAF
Recently did a smoke test and didn't find any vacuum leaks.
ICV was clean but decided to throw in a brand new one just for safe measure along with new hoses. That didn't change anything.
Bought and installed a new TPS, no change.
I'm at a loss right now, any ideas?
Bit of background:
The car is a 1986 325e
Did the swap a couple years ago, and it would occasionally idle odd, but the car sat for a couple years and the idle seems worse.
Before the swap, the previous owner of the motor installed the following new parts: crank seals, cam & crank position o-rings, water temp sensor, timing chain guide rails, timing chain tensioner, new thermostat & housing, water pump, ARP head bolts, main belt, spark plugs, and knock sensors.
Running a 413 red label dme with correct tune.
New MAF
Recently did a smoke test and didn't find any vacuum leaks.
ICV was clean but decided to throw in a brand new one just for safe measure along with new hoses. That didn't change anything.
Bought and installed a new TPS, no change.
I'm at a loss right now, any ideas?
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