Rough Running? Bad Mileage? How to Diagnose Car & Truck Fuel Injectors!

Learn how to diagnose fuel injectors in this video! Rough running, hard starts, poor mileage: all can be signs of a failed, or clogged fuel injector. These precision instruments need to be in top shape for your vehicle to run right. If you are having problems, and air and spark systems are in good shape, check out your fuel injectors!

⚠ DISCLAIMER:
While 1A Auto strives to make the information provided in this video as accurate as possible, it makes no claims, promises, or guarantees about the accuracy, completeness or applicability of the content. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. All do-it-yourself projects entail some risk. It is the sole responsibility of the viewer to assume this risk. 1A Auto is not responsible or liable for any loss damage (including, but not limited to, actual, consequential, or punitive), liability, claim, or any other injury or cause related to or resulting from any information posted in this video.

[AAuto]

√ *Watch the Video*
√ *Do it Yourself*
√ *Save Money*

[FleetTech]

I think this guy is my favourite. He’s always smiling and soft spoken.

[jediwookie]

First time watcher here, have watched many though. New subscriber though. I like your time taken to explain and visualize as well as multiple options for diagnosis. Very simple, modest, and thorough. Thank you

[bigjun]

best video on diagnosing fuel injectors, you guys are Pros....

[makavelitt]

I love the presentations on this channel. I learn a lot

[saby]

best video I've come across for complete diagnostic guide on injectors 👍🏻👍🏻

[automedicine]

By far the best channel on Auto education..

[RexerYTRexer]

Can I just let all 6 of my injectors spray into 6 small cups and measure the amount of fuel in each if its even they are likely ok if one is dry or less then i know its clogged/bad?

[chowaski]

im driving an inline 4 Nissan,
petrol,
it's 14 years old.

problem of mine is,
my car cranks fine,
my fuel pump is good.
plugs changed
air filter is good.
no vacuum leak(s)

at times esp after parking for more than 12 hrs,

my car would crank fine and start.
in about a few seconds it would idle rough.
rough i mean real rough.
the engine is literally shaking.

rpm bouncing between 500rpm - 1100rpm

when i step on the gas pedal either in Neutral or to drive off,

it would shudder the car,
it sputters
sound liken a boxer engine.
really sluggish acceleration only up to 3k rpm it smoothens out.

at times it would start fine,
idle fine,
after moving my car from the parking lot and driving it for less than 5 mins and shutting the engine off,

once i restart the engine
it would sputter again.
exhaust fumes are of awful smell.

to remedy the problem for the mean time to get the car going,
i have to rev it up in Neutral to about 2k-2.5k rpm for a few seconds,

it then smoothens out and it drive fine.
as if there was never a problem in the first place.

no CEL.

once i had CEL lighted up.

drove it at a constant rpm of about 2-2.5k it smoothens out and CEL is gone.

got a code before
P0350.

my question is,
is anyone experiencing the same issue regardless of any petrol car you drive.

[mrstonerudude]

Vacuum leak or injector? Slight idle cycling. Thanks for the video.

[wildthoughts]

WOW, this video deserves A++ grade, especially associated with a smile :) Thanks man. Well explained . Most videos I saw on injectors are vague .

[freeyourmind]

gold bro. have a GM car that runs and stalls. we put new pump, filter, regulator, even ultrasonic clean the injectors and once a load is place aka A/C on it dies.

[J_]

Could you diagnose a leaking fuel injector from the tip on your own or is that too complex to diy?

[karlhungus]

How do you diagnose the partially plugged injector though? Rough idle? How would you narrow it down without having to just replace every injector?

[skateever]

I hope anyone can answer my question. What's the logic behind clogged fuel injectors decreasing fuel economy? Shouldn't it save fuel instead, since less fuel is being injected to the engine because of the clog?

[eliaskauffmann]

"with the engine running place the stethoscope" uhhh my straight pipe would blow my ears out😂😭

[chepitok]

Would bad fuel injectors throw the check engine light on? I have white smoke out of my 2000 Ford f150 exhaust and wondering why

[jamesgadd]

Thank you my fuel filter came apart I'm thankin there part stoped up from old or stuff from the gas

[Artsalloverone]

Great description video to diagnose fuel injectors.

[Engineerboy]

Great job on the video, nice and short, clean and to the point. Thank you