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Bmw m40 engine when cold jerks

When the engine is cold it jerks the engine idles up and down until after the engine hots up then it is ok

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

SOURCE: transmission won't go into overdrive when engine is hot

Lexus's have a complicated system of electronics that control the function of the transmission.Under normal operating conditions the transmission is controlled by the ecu and by a secondary system called a drivetrain control module. usually when a fault occurs it sends a code to the ecu and the check engine light comes on.
If this light does not come on then typically the electronic modulator is at fault and needs to be replaced.
If the check engine light comes on when the vehicle is hot i need this code to guide u further for the repair.
If u want to attempt the repair , be wary. its messy and takes time to do to do it right.

Posted on Apr 25, 2009

Louie_3006
  • 79 Answers

SOURCE: BMW 320TDI HARD TO START WHEN WARM

Probable Spark plugs have blown. I would do a good tune up and replace your fuel filter, plugs and wires, oil and oil filter, air filter. Your system builds enough fuel pressure when it's cold becuase there is technically less are in your combustion chamber when it's cold so it can build more fuel pressure to start. When it's warm there's less room to build pressure to start your motor. So do a good tune up for now and see if that works. Hope you the best!

Posted on May 20, 2009

  • 120 Answers

SOURCE: My 98 honda civic lx (automatic) idles high around

with your a/c issue, the compressor might be faulty and not engaging and disengaging. have the a/c system level checked and recharged if necessary...if okay, then start to check the clutch in the compressor to see if it kicking it or not...maybe the low side or high side switch...as for your idle, it really didn't sound like a distributor,.....to me it sounds like you have a faulty, Idle Air Control Motor in the throttle body allowing in too little air, and when a/c is on, its just right...have them both checked,

Posted on Nov 17, 2009

  • 1206 Answers

SOURCE: 94 Toyota 22RE engine. Cold engine starts and

i would check the egr valve sounds like its sticking.

Posted on Jan 29, 2010

  • 7 Answers

SOURCE: Hi, my bmw 320d will not start when the engine is

starter needs changing

Posted on Jan 20, 2011

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1 Answer

What is wrong with my car when it jerks in drive


jerks when?

moving the shift lever. with hand?

moving car. in gear,name the gear, drive, L or reverse?

jerks from, 1 to 2nd gear, 2nd to 3? or ? (or when IT down shifts)

pretend we are blind (we are) and cant drive car,(hopeless) and

tell us exactly what works and dont work driving.

hot /cold engine, fast /slow/ accelerating/ decelerating, up hills and what gears.



if engine is hot, is your idle at 800 RPM parked, in park.

y/s

if not the idle controls are out of control and when you shift to drive

IT will jerk. this is an engine problem.

there are lots of other symptoms.

Jun 09, 2014 | 2007 Kia Sportage 4x4 V6

1 Answer

Cuts out or idles to high


it is a dangerous car to drive like this, "TOYOTA LIKE" dig?
if you are a toyata person the floor mats hit throttle pedal and gee....
is the dash cluster lamp called CEL glowing driving
if yes, scan the ECU/PCM read out the error numbers.
Like P0300 gross misfire. etc.
ever do a full 60k mile tuneup, ? why not, if not?

first tell the symptoms , of a hot and cold engine.
diagnosis takes facts and evidence. you offered some....
you start car cold ,does it idle fast (normal) then you drive
and idle is ok? near 800> until hot. see how that works.? the Fuelng
system works by temperatures of the engine coolant .
my guess your post is all HOT engine.

too fast idle HOT, this means the ISC (hot) is out of control
ISC is a system, not just 1 part. so dont buy an ISC.
The ISC is idle speed controls. and is the first to fail, this control
when there is any problems with,well, anything , under hood.
The ISC can get dirty and jam and may just need to be cleaned.
this is all part of normal turn up service, ask him why idle is high
i promise you , he will tell you. (ASE patch on sleeve)

the first thing to learn, on all EFI is which of the 4 systems yours is.
1999 era was only 2, AD and SD systems.
or MAP or MAF based EFI. (air or speed density systems)
i login to alldata.com and see?
there are 2 engines, a inline 4 and a V6, is MAF.

both engines have the cam timing belt if ignored, both engines
grenade with belt slipped or snapped. dont let that happen.
id never drive any honda , running bad, until the belt is checked 1st.
see why? $3000 new engines are VISA breakers.

OK my easement: (with limited inputs)
too fast hot idle on any MAF engine.
ISC stuck .
ECU in limphome mode, (scan it) and idle controls are shut down on purpose.
air leaks, is not it, if MAF engine, as leaks there cause lean and lean is slow idle (outofcontrol)

tell more, get more.

Dec 31, 2013 | 1999 Honda Passport

3 Answers

Why does my car jerk when i change the transmission from park to drive


the idle RPM is too high
or its just too cold,
how cold is it outdoors?
idle speeds cold can be about 1500 RPM/ cold.
and will ****.
it jerks because you are taking 0 torque from engine
and the sending that to a stalled rear axle.
this cause a ****, that is why the park lock out requires Brakes on
so yo dont run over things.

Oct 07, 2013 | 2005 Toyota Corolla

1 Answer

Test Water Pump on BMW


Loosen of the tension on the belt. see if there is any movement in the pulley (up-down -in -out Spin the pulley and check for roughness in the bearing.; Check for water leaking from the small hole in the housing at the base of the pump housing . Refit belt and correctly tension if nothing found. Check when it over heats (idle at lights) hard runs (speed) starts when cold and temp gauge continues to rise after engine is hot check if fan comes on at all.. Is the engine actually getting hot or is it an indication from the temp gauge ( faulty temp sender). If all is ok engines run hot if they are running lean so check the o2 sensor in the exhaust

Jan 26, 2013 | BMW X5 Series Cars & Trucks

2 Answers

Hesitation , skipping,engine cuts out when accelerating


Im having the same issue I believe. I have a 94\' Chevy 1500 and when i accelerate it will jerk like the gas has cut out but it wont stall. It just jerks and slows me down. It only seems to do it when going up a hill. I feel like it could be the fuel pump or possibly some intake gaskets?

Feb 28, 2009 | 1993 Chevrolet Lumina

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