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Bmw e36 316i, idle speed either runs at one and a half rpm or runs at below 1,ooo rpm and goes up and down. this only happens when car is not moving.

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Sounds very much like the air mass sensor is not right. This is found on a collar on the air ducting immediately after the air filter box. It ahas an electrical connection running to it. Whilst the engine is warm at running at idle (surge and slow) disconnect the electrical plug. Do not worry this will in no way harm the engine. The engine should soon resume a steady rate. It might be higher or lower than normal but it will be steady. If this happens then it is a certainty that the air mass sensor is at fault and should be replaced.

Posted on Aug 29, 2010

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What is causing the fast Idle and slowing down


well gee, there are 50 reasons.
did you scan the PCM yet, if not ,why not?
when the idle surges, that means.
NO RPM ranges stated, if super low rpm check EGR.

1: engine lean and ISC dead, or cant handle the huge engine power drop..The PCM can even make this worse!, buy hunting the ISC to find spec, idle and failing... to...
2: or any of 50 other things causing huge engine power drop and PCM can't maintain idle controls.
super lean burn.(bogging)
super rich burn, misfire for 50 reasons.

i cant hear your engine,nor feel it, or see it shake from gross misfiring.
no can i drive it and see/feel power loss,
can I?
asking net bunny's this (blind as bats)
is "OVER THE TOP" no?
so here , ill toss the dice for you
and guess gross misfiring.
ever get a tuneup this decade, if not bingo , no?

and the others...

http://jeepdied.com/Misfire101.html

link even has the 50 cause list, to show the futility of guessing!
we do 1 to 10 tests. and find it.
for sure.

as you can see EFI systems are complex.
gue$$ is not only expensive but can net you 2 problems easy.

Feb 05, 2016 | 2002 Jeep Grand Cherokee

1 Answer

Rpm's fluctuate at idle


The oil pressure quage is moving around because the engine is slowing down and speeding up. As far as the idle surging goes try this.

Mar 14, 2014 | 2002 GMC Envoy

1 Answer

Rpm drop below idle


What's happening is, the engine is under increase load when the A/C is running. Typically there is a solenoid (near the throttle linkage) that controls idle speed when the A/C compressor (clutch) is engaged. It activates each time the compressor cycles on to regulate the system. If idle returns to normal when A/C clutch is disengaged (or A/C is off), then the solenoid or some signal that controls the solenoid to maintain the idle is the likely to be the problem. e.g. The solenoid fuse maybe blown. This might be a good place to start investigating the problem. Best of luck resolving this problem.

Dec 10, 2013 | Cars & Trucks

1 Answer

Hi my car dies when clutch is pressd or when i change gears while AC on


Have you tried raising the idle speed another 100 rpms ?

Nov 15, 2013 | 2008 Ford Ikon 1.6

1 Answer

Hi, I recently been have a problem with my 1998 Honda, passport. While driving my Honda it would shut down then starts again on its own while rolling. At times it would not start again on its own you need...


sure, rolling in gear you mean. (same effect as push starting a car with M/T) what speed did it restart, 5mph or 50 or 85mph.?)
what transmission. A/T or M/T? BEG ERROR there !

shut down,?
you mean stalls,
and engine can do 3 things
run too slow (way below 800RPM idle , illegal idle speeds)
stalls (rpm goes to zero or you find zero power from the engine )
if you stop the car, and the engine stalls that is an engine stall.

or run perfectly.

does your model have a tachometer to you can see RPM?
and if idle controls work,
not posting the trans type, (non body does here) makes answers near impossible. infact most will just ignore you posts.

with a M?T car the engine immediately returns (hot ) to 800rpm
and is regulated very closely by the EFI brain (PCM)
if not you are seeing IDLE control failure.
with and A/T there is no MT clutch and when you stop
the autoclutch drags (wastes fuel like mad) and puts a huge load
on the engine, stopped say at a red light. the idle controls
on A/t are greatly taxed here.
so RPM can drop real low. fail. or stall. below 800
a stall happens at about 400 RPM.
the M/T can at any time be restarted on the fly (moving)
but just dumping the clutch. or just waiting as you coast in gear.
this is how push starting any M/T car works.
but on an A/T car , on the fly restarts take huge speeds.
and only works on A/T that have 2 oil pumps.
the A/T with no rear pump , the A/T can not be push starter
or coast restarted, if the front pump is dead(engine stalled)
im not looking up your tranny spec. because you never stated, it.


my engine stalls. (not tranny slip)
1: bad 12vdc power to any EFI system component.
2: never ever tuned up per the free operators guide in glove box.
3: lost engine compression. 1 or all cylinders.
4: lost spark. (or timed wrong, early cars have distributors)
5: bad fueling. too much or too little

when the engine runs , does the MIL, CEL glow running
btw the CEL also glows, at all stalls. the lamp only means.
I HAVE ELECT power, now.... only.

Sep 11, 2013 | Honda Cars & Trucks

1 Answer

Rover 75 v6 starts no problem runs 1000 rpm then


check idle speed sensor on your intake manifold around 700 to 750 rpm is normal ,air temp may efect idle speed .

Sep 17, 2009 | 1999 BMW 323 Series

1 Answer

My 1989 gmc half ton truck will die out when truck rpm or idle drops down.


happens mostly in reverse at very low speed. change spark plugs to an ngk, increese gap by 0.01 and advance distributer about 1 or 2 digrees to increase idle from around 800 to 850 or 900.

Jul 17, 2009 | 1989 GMC Suburban

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