Question about BMW 318

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When engin hot,idle loops and when i apply acceleratorengin very rough.

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Check for engine vacuum leak including air intake and filter assembly.Also fuel pressure.not enough info to narrow it down with

Posted on Oct 10, 2008

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Posted on Jan 02, 2017

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How to test an egr valve on a 94 topaz


Apply vacuum with a hand held vacuum pump, the engine will stall out or run really rough. If you have a very rough idle wet your fingertips and touch the lower part of the valve , if it is leaking then you will hear a sizzle and the valve will be very hot, replace the valve..

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My 2005 suzuki vitara idles up and down when a/c is on


this is normal. it has been so for 50+ years. if you watch under the hood, you will note that this occurs as the compressor cycles on and off. more load on engine requires more fuel, live with it.

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I have a 2012 camry se that has a rough idle


NO CHECK engine lamp (CEL) glowing running???????
which engine, there are more than one engines, offered on most cars.
that is misfire. and misfire is complex.
there are 50 causes of misfire, on Otto cycle engines (gas)
http://www.fixkick.com/misfiring.html

and more if flooding.
hot or cold engine?
or both?
ever do the 60k tune up?
id bet the engine is good, so we can remove 1 of the 3 main causes.
1: bad engine , no
2: bad spark, id bet not if miles is low, is it? below 60k?
3: bad fueling.
that is the proper order,
so if car is tuned up and spark is good.
then it must be fueling. so we connect the scan tool (any Can-bus)
and see DTC errors and it MIL active.
ok its sees misfire P0300s?
if no errors and its misfiring.
we then look at all sensors live with the scan tool.
id bet the engine dont hold closed loop hot, idle , as it must.
screen says, CL = active, or like kind.
if v6, there are 2 banks that must be in closed loop status.
I'll stop here, but will say I have a battery of tests for CL failures.

one is to make sure the 02 sensors work right and that there
are no exhaust manifold cracks near any 02 sensor.
i try to force the engine leaner and righter (tricks) that might
wake up a dead 02,
to see if it swings. (called cross counts)
the causes are many if the sensors are good.
fuel pressure out of spec,
injectors bad, leaking or clogged.
bad fuel.
dirty MAF sensor.
ECT stuck at wrong temperature for any reason, 180F or more is good.
and more... ask.



Feb 06, 2014 | 2012 Toyota Camry L Sedan 2.5L 4-cyl....

1 Answer

Why does my 1997 chevy s10 have a high idle while coasting?


Sounds like a dirty air filter is putting the mass airflow sensor out of range. The throttle position sensor is subject to physical wear, the age of your truck warrants replacing it. The coolant temp sensor controls the Idle Air Solenoid which determines idle speed ( cold, high idle, 1200 rpms open loop mode for the ECU) and (hot, low idle, 800 rpms, closed loop mode for the ECU) If the truck does not have a Mass airflow sensor, check the Manifold absolute pressure sensor (MAP). Perform an OBDII scan for stored fault history to avoid buying parts you don't need. Do the cheapest fixes first. Go ahead and change the fuel filter also. There is a lot of water in todays fuels

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Car idols rough no power


Mar 03, 2012 | 1999 Suzuki Esteem

1 Answer

ECM switches from closed loop to open loop at idle after warmup


WHEN ENGINE GOES CLOSED LOOP TO OPEN LOOP.YOU HAVE A RICH FUEL MIXTURE.YOU HAVE A VACUUM LEAK.BY YOU HAVING ROUGH IDLING.AND A HIGH MILEAGE ENGINE I WOULD DO A COMPRESSION TEST OR CYLINDER LEAK DOWN. CHECK FOR LEAKING VALVES AND LOW COMPRESSION .THEY BOTH WILL CAUSE ENGINE TO IDLE ROUGH CAUSE MISFIRE.CAUSE OPEN LOOP CONTAMINATE HO2 SENSOR CAUSE A RICH FUEL MIXTURE.

Sep 30, 2009 | 1984 Oldsmobile Delta 88

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Idles okay, runs rough when gas applied


Either a bad MAP sensor, or TPS. What is the code for the check engine light? This will most likely tell you what it is.

May 27, 2009 | 1994 Chevrolet C1500

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Rough idle / engine surges until power is applied


Sounds like a possible vaccume hose leak?

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