Question about 1999 BMW 318 ti

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E46 2000 318i hunting on idle

Changed breather off back of rocker - pcv - cam sens-crank sens- 02 sens- air meter- and still hunting . p0171 fault appears and traction light on . Bmw mechanic stuck. any suggestions on where to look. Cheers.

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Clean or replace idle control valve.

Posted on Sep 03, 2009

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I have fault code p0170 and the revs are erratic was suggested that breather is changed not sure if it is the one you have changed ,my eng management light on both sensors changed after the cat.

Posted on May 13, 2010

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1 Answer

Doin pcv delete, pcv comes into that blk n white 4 way with the plug above, across from plug is brake booster line, n then 3rd into intake...how do i contibue with adding a breather filter for pcv


adding a breather to a pvc unit defeats the purpose of the pcv
it is there to allow excessive crank pressure to vent into the inlet manifold at variations in vacuum in the manifold and to allow those gasses to go through the combustion processes to reduce emissions
if you want to regress the engine , simply add a breathing filler cap to a rocker cover
BUT if you do that and the engine is EFI controlled then you will have fault codes coming up all over the place as a sealed sump is a part of the ECM control process You have not mentioned make and model but early fords ran like sheet if they had a bad crankshaft seal or leaking rocker cover gaskets

Aug 21, 2016 | Cars & Trucks

1 Answer

I can be driving along and the car just dies, I pull over and wait for about 5 minutes and it will start back up and run like nothing has happened. "Check Engine" light never comes on. I borrowed a code...


02 is not the problem you stated there where cel on when the car died. They could have been pending codes not related to the stall. Common on this car is crank, cam sen. If the crank fails it will stall and not show a crank sen fault code.

May 18, 2014 | 1998 Honda CR-V

1 Answer

Fault code p0171 what the problem


P0171 - System Too Lean Bank 1
Possible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech notes If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.

Oct 09, 2012 | 2001 Renault Sportwagon

1 Answer

Replaced Fuel filter, Plugs and wires, PCV valve and the Throttle air control valve. Still running rough. Could it be an 02 senor or the catalytic Converter? Car wants to dye out when coming to a stop or...


Hi there, i had a similar problem with my Legacy B4 RSK Blitzen, 2 litre Twin Turbo, Engine EJ208. Car would idle sort of ok when cold, after warming up it would idle erratically (idle hunting) and cut out sometimes. I notices the boost gauge hunting along with the RPM'S .I found it to be 2 faults. 1st fault - If you have an after market air filter and the car hasn't been mapped for the extra airflow past the MAF (Airflow Meter) then it confuses the ecu as its taking in un-metered air. Solution - Re-map car to take extra airflow or as i did, i took out the MAF and cleaned it with a can of Carb&Choke cleaner. It worked but still had rough idle.
2nd fault - Air could be in your cooling system. If there is air in the system then the engine temp sensor is reading hot/cold/hot/cold everytime an air bubble passes by, which will cause running problems. You may hear a gurgling or slushing noise in the car, which is air in the heater matrix. Solution - From cold open the header tank and coolant overflow bottle, un car untill engine warm and hold at 2000-4000 rpm untill you see air bubbles rise in the header tank. Make sure your hot air is turned on in the car and vents open. Do this process for 10-15 mins and when you think all air is out of system then re-fit header tank cap. Have a watering can at hand as you may require to top it up during bleeding. It will overflow but dont worry.


Only real problems Legacy's give are , Air Flow Meters, Knock sensors, and Lambda Sensors (O2 sensor). Hope this helps mate, keep us informed on how you get on.

May 01, 2012 | 2002 Subaru Legacy

1 Answer

1997 nissan pickup 4 cylinder 1.8 ltr I believe. Oil is blowing back into the air filter. The small filter inside the air breather that catches the oil from the Rocker Cover gets filled with oil and...


has to have pcv or somebody took it out for some reason but if u are getting oil in the air filter like that most likly u hav a broke ring on one of your pistons

Oct 03, 2009 | 1997 Nissan Pickup

1 Answer

P1507 P0171 & P0174 error codes on 02 windstar


p0171 indicates the system is running lean on bank 1,p0174 means the system is running to lean on bank 2 p1507 is an idle speed under run fault i'd suspect an air leak is the cause of your problem check air intake system for airleaks

Aug 06, 2009 | Ford Windstar Cars & Trucks

1 Answer

97 Chevy Astro van lugs, like it misses, B4 finally cranking on


crank shaft sen. is easy enough to change.its mounted near timing chain cover,cam sen.is somewhat harder,its in the distributor,id doubt that both are defect

Mar 09, 2009 | 1995 Chevrolet Astro

6 Answers

Bmw 318i e46 idle bad


try disconnecting the air mass meter sensor if it runs better then ur air mass meter has failed had the same problem

May 30, 2008 | 1999 BMW 318 ti

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