Is there a way to test the injectors?

Tiny
JOHNYBGOOD
  • MEMBER
  • 1989 CHEVROLET CAMARO
  • 1.7L
  • V6
  • 2WD
  • MANUAL
  • 16,000 MILES
My car listed above is RS with a 2.8. It starts right up but shuts off right away. We put in plugs plug wire new EGR, TPS, it looks like injectors might be leaking, is there a way to test the injectors we can't figure it out, it's p me off we been working on this car now for a couple weeks, and not getting anywhere with it thanks for your help?
Monday, March 4th, 2024 AT 8:17 AM

8 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,480 POSTS
Sure, we can help you get it running, no problem. Can I ask if it will run on starting fluid? Also, testing the injectors is easier if you remove them.

Here is a guide to help:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Also, when you turn the key on without starting the engine can you hear the fuel pump run for about 5 seconds? I would try unplugging the MAF sensor to see if it starts as well. Please go over this guide so we can continue:

https://www.2carpros.com/articles/car-not-running-advanced

Check out the images (below). Let us know what you find.
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Monday, March 4th, 2024 AT 11:21 AM
Tiny
JOHNYBGOOD
  • MEMBER
  • 21 POSTS
It starts up on its own but shuts off right away, the fuel getting to the rail pump comes on 40lb of pressure. What happened was I was driving the car about 30 MPH, and the car backfired and shut off, it started right back up but shut off again would not start thereafter. I had her towed home and here I sit I need my car please help. Thanks for your time you guys' rock I will donate as much as I can. I have to see how much this car rim me for. Thank you again.
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Monday, March 4th, 2024 AT 1:15 PM
Tiny
STEVE W.
  • MECHANIC
  • 14,151 POSTS
Starts up and runs for how long? From the description of it running and the backfire and now it doesn't run I would think the fuel pressure regulator on the fuel rail mat have been damaged by the pressure spike from the backfire.
You say you have been working on it for a week? What have you already done?
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Monday, March 4th, 2024 AT 7:31 PM
Tiny
JOHNYBGOOD
  • MEMBER
  • 21 POSTS
I have changed the distributor, plug wires, plugs, MAF sensor, TPS, sensor 02 sensor, and a new battery, I think that's about it. The car will start of I put my foot to the floor but as soon as I let off it shut off, I got 40 lbs of pressure at the test port in thinking it might be the ECM. I don't know what else it would be. Thanks for your time.
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Tuesday, March 5th, 2024 AT 8:45 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,480 POSTS
Will it run if you have your foot on the throttle a little bit? In other words, can you make the engine idle if your foot is on the throttle? Can you upload a short video of the problem so we can see?
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Tuesday, March 5th, 2024 AT 11:07 AM
Tiny
JOHNYBGOOD
  • MEMBER
  • 21 POSTS
I have to keep my foot on the throttle for it to stay running and when I get it running I can only get it up to around 2,000 RPMs then it chokes out, and as soon as I let off the gas it shuts off. It has really got me confused it sound to me like it's out of time but my partner swears it's not we taken the dis out a least three time thinking it off a tooth I really don't know anymore. I thank you for your time though.
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Tuesday, March 5th, 2024 AT 12:58 PM
Tiny
STEVE W.
  • MECHANIC
  • 14,151 POSTS
Okay, go to the fuel pressure regulator on the fuel rail. Pull the vacuum line off and look for any raw fuel in the hose, try starting the engine, does any fuel come out of the vacuum port on the regulator? Yes, you have gas there, you can replace the regulator diaphragm to repair it. (Book says you replace the entire rail, but you really just replace the diaphragm these days, most of them come with the instructions for the process).
Nothing comes out then we need to look elsewhere. The normal fuel pressure running should be 40-48 PSI on them so your 40 could be OK but if the regulator was leaking it would act like it was flooding all the time like you are describing.
I would also check the MAP sensor voltage; a backfire may have damaged it as well.
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Tuesday, March 5th, 2024 AT 2:18 PM
Tiny
KEN L
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Anything?
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Saturday, May 11th, 2024 AT 11:55 AM

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