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Misfire idle misfire idol

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Run fault codes and look for low fuel pressure problem or faulty coil/s

Posted on Jul 25, 2013


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Spit and sputter

you are not supposed to adjust the idle, ever. that is the ECUs job.
adjusting it , now, means you have lied to the ECU.
it wont ever be right again. leave that screw alone, its a factory set

nice guess though, very carb like guess. Is common idea... sure...
its EFI. and has Idle speed controls.
if the engine misfires, (yours is) the RPM drops, the ECU tries to
raise idle 2 ways, by opening the ISC and advancing timing.(spark)

this can fail easy , if any EFI engine misfires.
what happens is the ISC has lost control..
lets use 1 example , 1 cylinder is dead, the ISC can NOT fix that. nor idle right.
the solution is to leave the idle alone.
then fix misfire, than last fix the ISC functions.,

but i get ahead of myself......

Did you do the 60,000 mile full tune up as listed in the oper guide?
no? well misfire is going to happen. (new spark parts and filters)

tune it up. if still misfire. we diagnose that 2nd, and fix it.

there are tests for each step. I can show you them, all of them.

there are over 50 causes of misfire.
here is a great list. and is not complete. !!!

one common cause is a leaky EGR main valve
now that guy is very pesky , even stalling engine
every traffic stop.

Jan 11, 2014 | 1996 Toyota Camry

1 Answer

Where is the idol screw on a 1992 cadilac ceville

the idle screw on the 4.9 liter is in front of the throttle body under the air intake cover. it sound like you may need to replace your idle air control valve it is located in the same area

Jan 15, 2012 | 1992 Cadillac DeVille

1 Answer

My truck misses idling an is kind sluggish done did a tune up on it

This can be a number of things. Could have any of the following.

Bad fuel pressure either by a bad pump, bad fuel pressure regulator, bad injector
bad ignition coil pack
broken spark plug seems stupid but you only have to crack it just a hair and you will have a misfire
bad mass air flow sensor just unplug it and see if your idol returns
vacuum leak
bad egr valve or sensor
bad idol air control sensor

If you have not checked for stored codes then you may want to consider doing it. That will at least eliminate several of the items.

Mar 26, 2011 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

I get a engine light that says #4 cylinder misfire could a bad idle air control valve cause this? It's a 2000 Hyundai elantra

not likely,idol air module controls fuel and air mixture for all cylinders not just 1,I would try a simple tune up

Sep 18, 2010 | Hyundai Elantra Cars & Trucks

1 Answer

I have a idol problem with my car. please help

Idle problem like what? too low? too high? If it is too low it could be because your air filter is way too dirty or the throttle body has a bunch of carbon built up in it around the butterfly valve and gets no air at idle. If it is too high you have a vacuum leak. air sucking in from a cracked hose or intake manifold gasket. Check all your vacuum hoses and spray carb cleaner around the intake manifold gasket while the car is running.

Oct 31, 2009 | 1997 Volkswagen GTI

5 Answers

DTC PO300 and PO506 engine won't idle when cold


Sep 04, 2009 | 2003 Pontiac Montana

1 Answer

Idol problems

the idle screw can be located by following the throttle cable to the carby body, you will find a quarter wheel which the cable hooks into at the bottom you'll see adjustment screw, this will adjust your idle speed.

Jul 13, 2008 | 2000 Ford Focus

1 Answer

2000 golf GTI problem, misfiring when idol

If it is hydrogen sulphide it could be coming from an overcharging battery, but in view of the misfire it sounds more like an over-rich fuel mixture could be fouling up your catalytic converter. Best course of action is to get a proper diagnosis at your garage or if you are technically minded you can buy a cheap interface cable and download free VAG diagnostic software and then do it yourself.
Hope this helps! D.

Jun 29, 2008 | 2000 Volkswagen Golf

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