1984 Injector Question
Thread Starter
Cruising
Joined: Oct 2013
Posts: 13
Likes: 0
1984 Injector Question
Trying to test fuel injectors to see if they are working correctly. First I tested them on 2000 om and the reading on both was 0. Then tested on 200 om reading were 1.5 (rear) and 1.6 (front) TB. Tried all om settings and only had a reading on 200 om setting the rest were all zeros.
Are the injectors cooked? Do I need to get new ones?
Are the injectors cooked? Do I need to get new ones?
Racer
Joined: Aug 2013
Posts: 301
Likes: 0
Sounds about right on the readings for your injectors, they are probably ok. When your meter is set to a higher scale, it is less sensitive to lower readings, so it is normal to see what you did. Have you checked for spark and fuel pressure also? ( I assume you are trouble shooting a no-start condition?)
Thread Starter
Cruising
Joined: Oct 2013
Posts: 13
Likes: 0
1984 Corvette troubleshooting fuel system
The vehicle starts but does not run for long. Have not checked the fuel pressure yet.
Unfortunately, the person we purchased the car from did not take the time to fix issues just found ways around them, it is such a headache trying to make heads or tails of the mess left. Basically the previous owner hot wired the fuel pump to the fan relay which was set to always be on, this way he by passed the computer. I know the car was over heating I am assuming this is why he did that "fix". Oh and the thermostat had been removed as well. Replaced thermostat, 2 cracked heads, rebuilt the TB, all new gaskets, and wired it correctly.
When the car does run it seem as though there is just way too much fuel being sprayed out. Did an oil change not to long ago and found gas in the oil pan and I have a feeling there is gas in the oil again. Also it took about and hour and a half to go through 5 gallons of gas with the vehicle idling.
Unfortunately, the person we purchased the car from did not take the time to fix issues just found ways around them, it is such a headache trying to make heads or tails of the mess left. Basically the previous owner hot wired the fuel pump to the fan relay which was set to always be on, this way he by passed the computer. I know the car was over heating I am assuming this is why he did that "fix". Oh and the thermostat had been removed as well. Replaced thermostat, 2 cracked heads, rebuilt the TB, all new gaskets, and wired it correctly.
When the car does run it seem as though there is just way too much fuel being sprayed out. Did an oil change not to long ago and found gas in the oil pan and I have a feeling there is gas in the oil again. Also it took about and hour and a half to go through 5 gallons of gas with the vehicle idling.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Leaking fuel injectors after the engine is shut off.
A ruptured fuel pressure regulator diaphragm (I assume your car works this way -- not sure on the '84s). The fuel pressure regulator is vacuum controlled and a ruptured diaphragm will allow fuel to go through the vacuum line and into the intake manifold. Check for this by removing the vacuum line and turning on the ignition. There should be no fuel coming out of the fuel pressure regulator or in the vacuum line.
Heel & Toe
Joined: Apr 2013
Posts: 24
Likes: 2
the x-fire is just like a carb. runs around 14psi and has a built in regulator, no vacuum necessary. it can be adjusted with a special tool but hard to do without one. sounds like the regulator is the culprit. search how to fix the regulator.
