Injector issue?

[sawguy]

Starts right up when cold and runs fine. When warm turn the key and fires up in a stumbling way and dies. Turn key again and turns over for roughly 15 seconds then starts and can smell raw gas and blackish smoke out the tailpipe. Does this sound like a bad injector?

 

[spartacus]

Starts right up when cold and runs fine. When warm turn the key and fires up in a stumbling way and dies. Turn key again and turns over for roughly 15 seconds then starts and can smell raw gas and blackish smoke out the tailpipe. Does this sound like a bad injector?

Are you up to date on you engine maintenance.when did you last replace air filter cleaned the maf or replaced the pcv valve? grey smoke means engine is running rich. black smoke for prolonged periods indicate burning oil. gas smell could be a stuck injector, bad sensor, etc. if you have access to an obd-II scan tool hook it up and look at the fuel trim and go from there obd blue tooth scanners are like 30 bucks on amazon and with the torque app you can see how your engine is performing will be able to diagnose the issue better.

 

[19963.4lsr5]

You very well can have a dripping injector.

Pull the vacuum line off the fuel pressure regulator during a no start and make sure there isn't gas in the line.


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[sawguy]

I'll use my scanner today. What should the fuel trim number be? I didn't use it because there was no code thrown.
BTW, where is the vacuum line to the fuel pressure regulator?

 

[spartacus]

I'll use my scanner today. What should the fuel trim number be? I didn't use it because there was no code thrown.
BTW, where is the vacuum line to the fuel pressure regulator?

the fuel pressure regulator is by the driver side fuel rail towards the firewall. with vacuum line hooked up to the lower part of the plenum it's got a round top.

High positive fuel trim numbers(corrections) can be caused by MAF, O2, vacuum leaks, clogged or dirty fuel injectors, fuel delivery issues, and clogged catalytic converter.
High negative fuel trim numbers can be caused by MAF, bad fuel pressure regulator evap system, leaking injectors, defective O2 coolant temp.sensor
if I was trouble shooting I would resistance test all these components to make sure they are within spec. then do a smoke test to see if I have any vacuum leaks and go from there.

 

[19963.4lsr5]

The only real way to see a dripping injector is by watching the fuel pressure after you shut off engine or pulling the fuel rail and cycling the key a few times.

LTFT of -10 to 10 are normal.

I've never seen mine below -3 or above -3 personally.


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