Car runs super rich post motor swap - ideas?

[Turf1600]

I put a new m20 in my 90 325is after my old motor got flooded. The car will start up and stay running if I manipulate the gap pedal - but it won't idle at all. Also, I'm getting a pretty heavy gas odor out of the exhaust. Anyone have any ideas? I swapped the wiring harness and TB off of the old motor.

TIA

[blunttech]

temp sensor. try swapping it out with the old one

[Turf1600]

Which one? on the radiator or near the t-stat housing?

[Dave]

t stat housing. The one on the radiator is just for the fan

[Turf1600]

Ok cool thanks.

[Jean]

t stat housing. The one on the radiator is just for the fan

+1. Make sure you replace the one for the ECU and not the gauge cluster :)

The ones in the radiator are just on/off switches.

[Turf1600]

+1. Make sure you replace the one for the ECU and not the gauge cluster :)

The ones in the radiator are just on/off switches.

So both of them?

[Jean]

No, I was just saying make sure you replace the right sensor as one is for the ecu and another for the temp gauge.

[Naplm00]

check the connection to the AFM

when mine comes loose (due to bad connector) car will run rich and not idle

[Turf1600]

Since the car flooded is it possible that the AFM is fried?

[backtrail69]

Since the car flooded is it possible that the AFM is fried?

very likely considering how craptastic they are to start out with, especially if the car injested water.

[Turf1600]

Swapped AFM made no difference. I'm wondering if I mixed up the fuel line and the return.

[george graves]

How's your o2 sensor? Do you have a cylinder not firing?

[backtrail69]

check to make sure the diaphragm in the FPR isnt dead too

[Turf1600]

02 sensor stayed on the car - it was newish. The FPR is from the 60k motor - I heard it run when I bought it.