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Injectors don't always open, so car wont always start.

Can't find a kia schematic, sonata seems different due to having different features. I want to know what tells the injectors to open when the car is first started, a relay or something like that.

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2 Answers

The cars pcm,or ecu (computer) controls the injector
pulse width,the timing & how long they are open

That type problem is way beyond your ability, even
with a wiring diagram

You need to check for spark & injector pulse when cranking,
to confirm that the crank sensor is working, as well as fuel pressure

Beyond that, you need a repair shop with an oscilloscope
to test things

Posted on Mar 01, 2013

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  • Cars & Trucks Master
  • 2,518 Answers

Check for its specification (Ohm) If not within, replace it.


mai Lor

Posted on Mar 01, 2013

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 393 Answers

SOURCE: 1999 F 250 crank but wont start

look on injector pump make sure there are no loose wires

Posted on Dec 09, 2008

  • 10 Answers

SOURCE: Help w 1994 chevrolet truck

disconnect the batt. is your fuel pump running check fuse listen for it

Posted on May 28, 2009

  • 1071 Answers

SOURCE: 1997 Kia Sportage wont start

check to see if timing belt has jumped

Posted on Aug 19, 2009

roniecon
  • 6927 Answers

SOURCE: i have a 2001 camaro with a 3800 v6 it cranks but

The crank sensor is what pulses the ijectors,and makes the spark,so I would start at the crank sensor.Let me know how you come out.Check for any blown fuses also.Ecm fuse would cause this,but it may be called anything ,so check all fuses.

Posted on Sep 10, 2009

  • 32 Answers

SOURCE: 87 F150 wont start. New fuel pump, rail,

try changing the igniton module on the distribuitor in most cases it's the problem if you dont want to buy it you can take the ignition module to a autozone and they will check it for free

Posted on Sep 19, 2009

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1 Answer

Misfiring on cylinder 1. symptoms: sputtering and engine shaking


That shop does not know how to test your cars problems

Injector Cleaner is not a fix for dirty or worn injectors

If they don't use an oscilloscope in their testing, they are
living 25 years in the past

Why did they not find the problems,they said they did lots of
testing,apparently stopped somewhere & gave up or don't
have the ability to do what is necessary

Could very well be a mechanical issue

A cylinder leak down test,mechanical or using a transducer
& scope, as well as scope the injectors & cylinder contribution
test, will tell you most likely whats wrong.

Try another shop & research their capabilty first

Jan 30, 2013 | 2002 Toyota ECHO

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I have a 2001 KIA Sephia I've had within the last 2 months the timing belt replaced, the fuel filter, pump & relay switch replaced, alternator and a new battery put in and it seems like I'


This will need a hands on inspection by a qualified mechanic. i suggest the Kia dealership, but at a minimum it needs to go to a different shop than the one you've been taking it to as they seem to not know what they're doing.

Mar 22, 2017 | 2001 Kia Sephia

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01 kia rio keeps blowing the injector fuse every time i put it in first and take off how do i fix it


You may have a shortted injector. Pull all the injector connections off, put a new fuse in. If it still blows the fuse, you must have a short in the injector drive circuit from the ignition switch to the injectors. I don't know what all is in the circuit, but you may have a resistor pack before the current reaches the injectors
If the fuse did not blow, then one at a time, reconnect the injectors. You are looking for a shorted injector that blows the fuse. If the first connection blew the fuse, disconnect that one, put in a new fuse, and start with a different injector connector. You may find one that blows the fuse, meaning it is shorted, and needs replacing.
Good luck.

Apr 08, 2012 | 2001 Kia Rio

2 Answers

Open circut injector 2


A defective signal wire from the processor.

Mar 23, 2012 | 2000 Chrysler Grand Voyager

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What are diods #'s 1 & 2 on a 2004 Kia Optima fuse panel, #'s16 & 17?


always check the simplest things first. is it getting spark? if so, is it getting gas? if so, is it getting enough gas? and so on...

Jan 21, 2012 | 2004 Kia Optima

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2005 sedona won't start all of a sudden. Doesn't make a sound except for a tiny whirring sound like the feul injectors. Replaced starter...still won't start. checked all fuses...they are good....


you could just have dead cell in the battery which isn't getting enough amps to the starter,, have the battery LOAD checked,, that will tell you if the battery is actually good, just because it registers 12 volts isn't necessarily an indication that the required amps are present.

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1 Answer

I have a 2003 kia rio runs great hesatates slighty on take off what could it be


You didn't mention the mileage, but you should consult the owners manual & see if any tune-up maintenance may be due. Additionally, the air filter, fuel filter, fuel injectors, spark plugs as well as a few other items can cause hesitation on acceleration.

If there are no engine warning lights, you could also try a little fuel injector cleaner (available at your local auto parts store & most larger auto departments of places like Walmart) I always get the 3.00 a bottle gumout cleaner, use 1 bottle for a 1/2 tank, repeat in about a week & see if that doesn't help. good luck

Jan 31, 2010 | 2003 Kia Rio

1 Answer

I am installing a new/different radio in my


stop in walmart or radio shack and pickup a install kit and that way all you have to do is plug it into the plug you have and you then know where the wires go wish you the best of luck Michigan Man

Nov 27, 2009 | Hyundai Motor 2004 Sonata

1 Answer

I am getting error code P0203 on my 2000 Hyundai Sonata, V6. This indicates #3 Fuel injector open circuit. Have replaced fuel injector and continuity of wiring is strong. I am stumped as I continue to get...


Ok.... let's get this clear -- you have 'VERIFIED' no problem with the wiring between the injector connector pins and the ECM?? and you have good pin tension at the injector? and good pin tension at the ECM? and good continuity between the injector & the injector fuse? If in fact this is SO, you have a bad ECM (Engine Control Module). 303f9ab.jpg

Sep 07, 2009 | 2000 Hyundai Sonata

1 Answer

Ce lights on code reads #3 cylinder misfire


I assume this 'complete' tune up was plugs, wires and plennum (intake surge tank) gasket?
If so, recommend you first check to see if you are getting an injector pulse to the #3 injector (a noid light is normally used to verify the injector is receiving the 'pulse' from the ECM. The noid light is a very useful tool in finding out if you have problems with your fuel injector. It is cheap (around 10 dollars per piece), easy to use (if the light blinks, your injector is receiving the electrical pulse to open). If after you verify the injector pulse is present, the next step is to determine if the injector or cylinder is the problem. A simple verification process requires swapping the #3 injector with another to see if the misfire moves to the swapped cylinder.(.i.e, move #3 injector to #2 cylinder & the #2 injector to #3 cylinder.).. Then run engine to see if the P0303 changes to P0302. This would VERIFY the injector is in some way defective. If the misfire STAYS at #3 cylinder, you'll want to perform a compression test of all the cylinders. If after this test you find #3 cylinder is more than 10% lower than all the other cylinders, do a 'Leak-Down' test to determine if the low compression is due to leaky valves (intake or exhaust) or whether the piston/rings are the problem. NOTE: If all the cylinders are withing 10% of each other during the compression test, the possible causes are, injector O-ring leak, vacuum leak at the intake manifold at #3 cylinder, or the spark plug not firing under compression.

Mar 15, 2009 | 2000 Hyundai Sonata

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