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Stalls at idle, misfires when driving - 1986 Nissan Pickup 4WD 1986

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This is probably going to be rotor(distributer) , spark plugs, and/or plug wires...its time for a tuneup.. replace those and it should run like new... there is an outside chance it could be a bad head gasket or cracked head but you would be losing water and your radiator would have to be filled every so often..also there would be some steamy smoke coming out of the tailpipe..if thats not happening then do the tuneup..

Posted on Mar 25, 2011


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SOURCE: 1997 skylark tries to stall on take off & idles rough, & misfire

Waited for engine to cool and checked all vacuum hoses and sensors, according to vacuum diagram and found a couple of dry rotted hoses. I replaced them and troubles went away.

Posted on Jun 14, 2009

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SOURCE: rough idle stalls after about 10 minutes lean

Check the MAF sensor. Take it out and clean it or replace if need be. Good luck

Posted on Dec 28, 2010

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How do you fix an idleing problem on b2300 mazda truck?

What kind of idling problem ? An what year Mazda ? Idle is controlled by the engine computer via a IAC motor , idle air control valve or motor, what ever Mazda calls there set up ! Or if a fairly new vehicle, they use drive by wire or electronic throttle control . With the idle air control set up passages get plugged an don't allow enough air to by pass the throttle plate causing stalling problems . A vacuum leak can cause a ruff unstable idle an stalling also . A dirty throttle plate can cause idle problems as well ! A scan tool ,not a code reader is a very use full tool to check engine data parameters. With the scan tool you can view idle air control counts . To see if the engine computer is actually controlling the idle air control valve . Idle Air Control Valve

Also an engine misfire can cause idle problems , also clogged fuel injectors can as well . A good diagnostic technician would start with hooking up a professional grade scan tool , checking for DTC'S - diagnostic trouble codes , misfire data , engine sensor data , IAC counts ! Section 20 Idle Speed Controls lecture preview

Oct 02, 2015 | Mazda Cars & Trucks

2 Answers

2002 rodeo, starts and when put on gear stalls

Automatic transmission ??
Check engine lamp illuminated ??
Cold engine idle speed ??
Warm engine idle speed ??
IAC (Idle air control) system operation ??

May 28, 2015 | 2002 Isuzu Rodeo

1 Answer

My car is a 2000 impala 3.4l sedan front wheel drive but its from the last post i put up on here

that noise, my wild guess is MISfire. and the engine RPM is way too low at idle (how low?) below 800 rpm?
that is misfire, and will stall.
this is all normal for gross misfire. on any car,
the shop (real) would plug in the scan tool and look at the live data
from the PCM. and see if there are pending codes. P030x codes
and look at all live parameters.
they'd see, ah idle controls failed, and is misfiring.
loss of idle controls is cause by 2 things, (in proper order)
1: engine misfires, or runs real bad.
2: ISC idle controls dead. (can be caused by above, most times)

misfire has 50 causes, and about 1 to 10 tests to find them.
you can gue$$ or test.
which one floats your boat?

Jul 10, 2014 | Cars & Trucks

1 Answer

Replaced iac valve engine will not idle

wow , no year stated. amazing....
which engine? size and gAS or diesel>?
stalls only hot?
is thermostat good and holding 180F or more???????
why gue$$ ?

Stalls have huge causes.
1: the ISC sticks is but 1 of 50 causes (have list, i pass)
misfire is the other
the EFI Tries very very hard to stop stalls, (opens ISC/IAC 100%)
if it can't. it stalls.
why did it stall, lots of ways.
Misfire from too lean or flooding.
EGR stuck open. is #1 all top DOG for stalls.
EGR can stick open, and when it does, it will stall

no the big questions, not ever answered here ever.....>>
can you save the stall with a fast right foot action.?
tad hard.
The answer here, can save tons of hard work.

and is the CEL glow key on, in the dash? Check engine light at key on
then stay out driving, NO< why not scan this car.
do not ever ignore this lamp, scan it or spend eternity fixing car.
buy a scan tool, and learn to use it.
learn how sensors. work and how they read.
learn what closed loop is. (if not in CL hot , fix that now)

if the engine drops closed loop, hot, at idle this means
fueling is out of control and idle is only a victim.
check closed loop status hot engine. and win.

here are all the steps 1 by one on a good engine.

this is just a typical 1.6L 16valve SOHC engine.
MAF based injection, here. any motor with maf , like this..

Feb 17, 2014 | Jeep Liberty Cars & Trucks

1 Answer

My car idles really rough in drive when sitting still. It stalls out when yo cut the wheels all the way while sitting still.

It sounds like you have an engine misfire. Your car probably idles rough through each state, including Drive, Park, and Neutral, but you'll only really notice it when you're transmission is engaged. Anyway, there are only 2 things that can cause a misfire: ignition issues, or fuel delivery issues. The most common of all issues is a loose or damaged spark plug. A lesser issue for ignition systems is a bad coil (this would depend on the year of the car). An even rarer issue would be a bad fuel injector (again, this depends on the car's age). I would begin with this diagnosis. You can find videos on how to check the spark, which is where I would start.

Dec 12, 2013 | 2001 Dodge Stratus

1 Answer

My 1992 jeep cherokee sport inline6-4.0L idles rough and stalls when warm...

ever tune it up? ever , or at the 60k mile points?
if not why not.
does the CEL lamp glow running>?
rough idle is called misfire.
stalling can be many things, a mech sees this all in 5min.
here on the form i have to ask many questions (cant drive it)
lets play that out.
1: i start car and ask owner, ever tune it up,: blank stare.
2: i see it dont reach 180F coolant temp,. (bad thermostat)_
3: then note misfire. i tune it up and its fixed. or
4: it still misfires,, i find the EGR stuck open. (listed under service 60k)
5: it still misfires, i find idle too low, the ISC is stuck closed.
i clean the EGR and ISC valve and car now idles ok,
but is still rich , i find the 02 front sensor long gone bad.
it looks like it has cancer.
there are over 50 causes for misfire,
1 or all 6 cylinders. what we do is start with basics and work up.

here are 2 hints on stall.
first off the ECU failed to stop the stall, its programmed to do that
using the ISC .
so it failed to work.
the EGR stuck open will do that every time or idle at 500RPM
and shake the engine hard, misfiring.
or if one cylinder or more is dead.
or if the ISC sticks closed.

so when it seems to stall, pre-stall, as RPM drops below 800 rpm
you use a fast right foot. is it easy to prevent the stall?
easy,save, is isc stuck closed? gummed up.
harder is EGR stuck open, (but you can correct it by hard actions of right foot)?
impossible to stop the stall.?

your mech, does all that action in 5min. flat.
even loss of 12vdc power to EFI systems , do this.
(cant save it) and mech sees dash lights go dead. bingo no DC power, all by looking and seeing. and feeling.

he gathers evidence,

both my 4.0L jeeps, loved to stick the ISC.
every 20kmiles, off it cam and got sprayed with
Klondike gun lube, Dry lube. no oil , it looks like brown paint
and acts like Teflon.
The 4 liter likes to get he PCV oil mist up to the ISC,
this builds a film of gunk on the valve cone inside .
im not saying this is it, but the easy save above is a big clue.

Oct 02, 2013 | 1992 Jeep Cherokee Sport

1 Answer

1997 skylark tries to stall on take off & idles rough, & misfire

Waited for engine to cool and checked all vacuum hoses and sensors, according to vacuum diagram and found a couple of dry rotted hoses. I replaced them and troubles went away.

Jun 13, 2009 | 1997 Buick Skylark

1 Answer

Car is stalling and idleing irradically.

I Would Suggest That You Complete A Engine Cylinder Leak Down Test.....(not A Compression Test But A Leak Down Test) this will tell you if you have internal problems....possible worn rings or a burnt valve(s) I would use a smoke machine to check for vacuum leaks also. Good Luck

Mar 24, 2009 | 1994 Volvo 850

2 Answers

Idle problem

Check, MASS airflow, and your throttle position sensor.

Feb 14, 2009 | Suzuki Esteem Cars & Trucks

1 Answer

My bmw 328i misfire?

If u don't have a check engine light try this procedure to fix it.
Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Feb 11, 2009 | 2003 BMW 325

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