Symptoms of bad fuel injectors? - 3000GT/Stealth International Message Center
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Old 09-10-2008, 07:41 PM   #1 (permalink)
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Mitsubishi Symptoms of bad fuel injectors?

What would happen if the fuel injectors were bad/clogged or "going"

I think it's a possibility that they could be bad in my car. Any way to really tell?
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Old 09-10-2008, 07:53 PM   #2 (permalink)
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Default Re: Symptoms of bad fuel injectors?

Quote:
Originally Posted by FreeStyle786 View Post
What would happen if the fuel injectors were bad/clogged or "going"

I think it's a possibility that they could be bad in my car. Any way to really tell?
Yea, first thing would be to check your plugs. Typically white will be lean, heavy black its rich, to be really simple about it



Here is a lean plug.





Then pull each injector one at a time, shut the car off each time you unplug/plug one in, let it spray into a bucket or something. Wear a mask. This will allow you to check to see which one is bad

Last edited by VentiQuattro; 09-10-2008 at 08:05 PM.
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Old 09-10-2008, 09:27 PM   #3 (permalink)
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Default Re: Symptoms of bad fuel injectors?

Since your first gen you can build a datalogger pretty cheaply (if you search around there's a lot of information on it). With the datalogger (running MMCD) you can turn on and off each injector individually. If you try and turn off an injector and do not notice any difference in the way that the engine is running then you know that, that cylinder is the one that has the problem.

This is not 100% full proof for testing that the problem is an injector, but it will guarantee you which cylinder the problem is with so that you don't half to try and check each one individually.
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Old 05-29-2009, 11:55 PM   #4 (permalink)
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Default Re: Symptoms of bad fuel injectors?

um i know this thread is old but what else can you check to see whats causing the cylinder to be going bad? i checked cylinder 5 is the problem, but replaced spark plugs, coil pack, and checked wires but nothing....im thinking of putting the tt fuel injectors that i have laying around on my SL but what else could cause this problem?
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Old 05-30-2009, 08:55 PM   #5 (permalink)
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Default Re: Symptoms of bad fuel injectors?

Do not put TT injectors in you SL. It will make it run HORRIBLY rich and you will also burn up the injectors.
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Old 05-31-2009, 08:59 PM   #6 (permalink)
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Default Re: Symptoms of bad fuel injectors?

but i thought it was the computer that sned how much fuel it releases
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Old 05-31-2009, 09:09 PM   #7 (permalink)
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Default Re: Symptoms of bad fuel injectors?

NO!!!!!!!!!!!!!!!!

The computer sends a signal for the injector to fire a full spray pattern. The computer has no clue what injectors are in there.
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Old 08-04-2009, 10:17 PM   #8 (permalink)
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Default Re: Symptoms of bad fuel injectors?

other than pulling out the spark plugs to check them what type of symptoms will the car experience if any. Mine felt like it was misfiring.
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Old 08-04-2009, 10:18 PM   #9 (permalink)
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Default Re: Symptoms of bad fuel injectors?

It will run horrible and you will likely burn the injectors out.
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Old 03-06-2013, 03:51 PM   #10 (permalink)
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Default Re: Symptoms of bad fuel injectors?

With bad spark plugs does that make the engine run slugish? In any gear it runs good but as slow as a damm sentra if my foot is light on the pedal, but as soon as I stomp on it I can hear the engine rumble (no shaking) but the car does not go fast ive been driving it like this for about a year, do you guys think its a as simple as the spark plugs? It also smokes when the car is on idle after like 4 min?
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