okohigg4
05-14-2024, 10:25 PM
Hello all,
This is my first post ever so please bear with me for all the newbie mistakes.
I have a '91 BMW 318 is, with an M50B25TU engine out of a '95 525i auto, courtesy of a friend. My current issue is as follows:
The car is running rich and idles badly after warming up. When I first start up the car, the idle is smooth but after warming up and driving it for some time, it starts to have a very rough idle. While driving it on the street or the highway, I see no issues but as soon as I come to a stop, the car lobes very badly and I can smell unburnt gas out of the exhaust. I pulled the dipstick the other day to check the oil level and it had risen. I initially thought that the head gasket was done for but the oil did not look like brown milkshake when I did the oil change. Also, the dipstick smelled of gas.
Secondly, after getting stuck in stop and go traffic, or even idling for more than 15 minutes, the car starts hesitating and idle becomes worse, almost to the point of stalling out (but it does not). The engine shakes like a mf, pushing the accelerator makes car jerk forward and I have to get the revs higher than 4000 for it to not do so.
I am not able to do a stomp test as the CEL is not wired. I bought a code scanner but I am not able to get any read as it looks like the ECU is not communicating with the scanner (although the scanner shows power). Also, this scanner was OBD2 which was connected using an OBD1 adapter.
I have cleaned the MAF and the ICV, but to no avail. I am going to check the fuel injectors and see if any is leaking.
I looked around in the wiring harness and did not find a pigtail for the O2 sensor. Jacked up the car and looked at the exhaust but could not locate the O2 sensor either. The car has aftermarket headers, which has the bungs welded in, but have been bolted off. Could this missing sensor be the issue? I am working on getting a AFR kit.
Any input on this will be greatly appreciated. Thanks!
This is my first post ever so please bear with me for all the newbie mistakes.
I have a '91 BMW 318 is, with an M50B25TU engine out of a '95 525i auto, courtesy of a friend. My current issue is as follows:
The car is running rich and idles badly after warming up. When I first start up the car, the idle is smooth but after warming up and driving it for some time, it starts to have a very rough idle. While driving it on the street or the highway, I see no issues but as soon as I come to a stop, the car lobes very badly and I can smell unburnt gas out of the exhaust. I pulled the dipstick the other day to check the oil level and it had risen. I initially thought that the head gasket was done for but the oil did not look like brown milkshake when I did the oil change. Also, the dipstick smelled of gas.
Secondly, after getting stuck in stop and go traffic, or even idling for more than 15 minutes, the car starts hesitating and idle becomes worse, almost to the point of stalling out (but it does not). The engine shakes like a mf, pushing the accelerator makes car jerk forward and I have to get the revs higher than 4000 for it to not do so.
I am not able to do a stomp test as the CEL is not wired. I bought a code scanner but I am not able to get any read as it looks like the ECU is not communicating with the scanner (although the scanner shows power). Also, this scanner was OBD2 which was connected using an OBD1 adapter.
I have cleaned the MAF and the ICV, but to no avail. I am going to check the fuel injectors and see if any is leaking.
I looked around in the wiring harness and did not find a pigtail for the O2 sensor. Jacked up the car and looked at the exhaust but could not locate the O2 sensor either. The car has aftermarket headers, which has the bungs welded in, but have been bolted off. Could this missing sensor be the issue? I am working on getting a AFR kit.
Any input on this will be greatly appreciated. Thanks!