Second Update on 1989 No start
Thread Starter
Burning Brakes
Joined: Sep 2010
Posts: 799
Likes: 26
From: Lexington Park Maryland
Second Update on 1989 No start
Its been awhile, but the car in now running. Not on all cylinder, never the less it is running. Here's what I did:
I pinch both the supply and return fuel line at the filler tube area.
Disconnect the power to the fuel pump
Attached a fuel injector cleaner I built with cleaning solution I mixed together
applied 60 psi to the rail
checked individual injectors with a harness I fabricated, as I activated each injector I let 10 psi of the 60 bleed out. I kept doing that until all I did it to all the injectors
started the car with the injector cleaner still hooked up to the rail
The car idled and I was able to rev it up, I let it idle for several minutes and rev it up several time.
Then it just died, I tried to start it again. it was doing the same thing as before, so I decided to check the injectors again. One by one I can hear them clicking as I apply power to them. When I got to #8, I did not hear it click. I doubled check, still nothing. So I told myself I have a dad injector, with the connector still plugged into the bad injector. the car would not run like it did before, then I remembered a Youtube video I saw the other day, if you have a bad injector on these cars, just unplug it.
So I did, then the car started and even drove it to the school close to me and did some circles. I guess the way this injectors are wired together, if one is bad the whole system will not work. Something like Christmas tree lights, one goes bad the whole strand does not work.
One thing I am not sure about: When adjusting the timing on my 1984 Suburban, I had to disconnect a single wire to prevent the timing from being advance while setting the initial timing. Can someone point me to the location of such wire so I can adjust timing? Thank you for everyone's input on where to look to get this car running again.
I pinch both the supply and return fuel line at the filler tube area.
Disconnect the power to the fuel pump
Attached a fuel injector cleaner I built with cleaning solution I mixed together
applied 60 psi to the rail
checked individual injectors with a harness I fabricated, as I activated each injector I let 10 psi of the 60 bleed out. I kept doing that until all I did it to all the injectors
started the car with the injector cleaner still hooked up to the rail
The car idled and I was able to rev it up, I let it idle for several minutes and rev it up several time.
Then it just died, I tried to start it again. it was doing the same thing as before, so I decided to check the injectors again. One by one I can hear them clicking as I apply power to them. When I got to #8, I did not hear it click. I doubled check, still nothing. So I told myself I have a dad injector, with the connector still plugged into the bad injector. the car would not run like it did before, then I remembered a Youtube video I saw the other day, if you have a bad injector on these cars, just unplug it.
So I did, then the car started and even drove it to the school close to me and did some circles. I guess the way this injectors are wired together, if one is bad the whole system will not work. Something like Christmas tree lights, one goes bad the whole strand does not work.
One thing I am not sure about: When adjusting the timing on my 1984 Suburban, I had to disconnect a single wire to prevent the timing from being advance while setting the initial timing. Can someone point me to the location of such wire so I can adjust timing? Thank you for everyone's input on where to look to get this car running again.
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The fuel injectors are connected in parallel. If one shorts, it shorts out all 8 of them. That's true for all L98s. The injector driver transistor is pretty robust, but it does have its limits.
