95 318i Emission Lambda Control issues - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
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#1 (permalink) Old 10-04-2012, 11:16 AM
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Unhappy 95 318i Emission Lambda Control issues

I have a 95 318i 1.8L 4 cyl. w 211 k miles. I recently experienced real bad idle issues surging up and down. Gets better after warm up but still bad. Fuel economy is gone. It is blowing black smoke out of exhaust. (Running Rich) It first happened intermittently when I would surge acceleration, it would run rough at idle but then it would go back to normal. I noticed a decrease in MPG. So I kept track and was getting only 17 MPG (Normal 25+). Upon initial error code reading got a 2A(Knock sensor) 46 (o2 sensor) 49 (Vehicle speed signal not present). I have replaced all these items and codes are clear on these. The final code I am getting is a C9 (Emission lambda control) error from my R5 code reader. I have replaced the O2 sensor, Water temp sensor, Fuel pressure regulator valve,vehicle speed sensor(in differential), new rubber boot from MAF sensor to throttle intake, new Knock sensor 3-4 cyl. I have removed and cleaned ICV(idle control valve) i can hear it run when car is on) I checked Throttle positioning sensor (Electric) perfect reading. Removed upper intake and checked all hoses for air leaks, NONE FOUND. Cleaned the throttle body, upper intake, MAF sensor.Check ECM, (clean contacts/no water) PLEASE SOMEONE HELP !!! I AM AT MY WITS END AND MY WALLET HURTS EVERYTIME I GO TO THE FUEL PUMPS. Quick question ?? Could the Catalytic Converter be causing this? I noticed code reader for my car model does not have a code for a "Bad CAT" Anything is appreciated.
PS. Recent repairs, New Fuel pump, fuel filter, alternator, crankcase ventilation valve & hose

Last edited by iamdonjuan; 10-04-2012 at 11:22 AM. Reason: forgot to add recent repairs
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#2 (permalink) Old 11-13-2012, 02:56 PM
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Finally got my ride back.I took it to a mechanic. It was the (MAF) Mass Air Flow Sensor. It was not throwing a code as being defective. Mechanic said that MAF & Fuel Pumps are known to not throw out codes. Hope this helps to the readers. Because I got no responses.. Good luck.......
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#3 (permalink) Old 11-14-2012, 08:00 PM
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what did you pay? I'm kinda in the same boat but a little difference. I got my 95 318i knowing the afm (mass air flow) was bad I bought a new one and since have done a bunch of other stuff to the car.... I'm over $3000 in the car all in parts, My Scanner says I'm lean at idle I get a check engine if I idle for long periods.I wonder if the afm I got is bad, I have a smoke machine I hooked up to check for vaccum leaks the only one left is at the bottom of the butterfly valve in the lower intake. I already had the the lower off when I changed the starter
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#4 (permalink) Old 11-14-2012, 08:39 PM
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Thats exactly what mine was doing. After a long idle i would get the check engine light on. It even got to the point were when I was driving the engine light would come on and off. I paid $70 plus $30 for overnight shipping on Ebay. Sorry to hear you got to $3000 but then again it means you should have a brand new ride and its ready for another 250K miles. On a good note, The mechanic said those engines are like tanks and cant be stopped unless you over heat them. I also learned that if you just unplug the Mass air flow sensor the car goes into limp mode but will run alot better than with it plugged in.
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#5 (permalink) Old 12-21-2012, 08:40 AM
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Garage
Maybe the CCV is bad.
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