Need help starting a 75 1.8L L-Jet in NoVA, Injectors not spraying Options

[wrightee]

I have a '75 1.8L L-Jet that has sat for a while. Its my parts car, but I'm trying to get it running now.

When I got it, the fellow told me the double relay was bad, so I replaced that. Fuel lines were also totally gummed at the tank, so those have been changed, tank cleaned and fuel filter replaced. I also had the fuel injectors tested and cleanded. I had also found a shredded "stray" wire, which turned out to be the engine temp sensor (under the engine sheet metal), which was replaced.

The car will "fire" when I spray starting fluid in the intake. I don't have a pressure guage, but the pressure is sufficient to blow an improperly clamped fuel line off the fuel rail (I had an injector out, and some fuel must've sprayed into the hole, causing a "sputtering" near-start). I pulled the injectors to see if they were spraying, and they are not.

When I manipulate the AFM flap, I can hear both the fuel pump as well as a "hissing" sound from the pressure regulator (but can not see any leaks).

Troubleshooting these type issues is not my strength (IMG:style_emoticons/default/confused24.gif) so any help/advice on where I need to look next would be greatly appreciated.

[timothy_nd28]

No prob,,all of those pins should have 12vdc. I've made a couple of assumptions here, so don't get offended. Are all the fuel injector connectors plugged onto each injector? We know one is plugged in, and making continuity,,this is why your measuring 12vdc at the ECU connector.

With the one pin on the ECU connector reading 12vdc on the previous test,,if you apply ground on that pin, do you hear a click?

I would suggest pulling off each injector lead, then re-seating each connector with a slight wiggle, to ensure a good electrical connection. Then retest those pins at the ECU plug to see if you have any more 12vdc pins. If you have the same results, (one out of 4 has 12vdc),,then pull off each injector lead and probe one of the 2 contacts. With the ECU plug still unattached,,,one contact will measure nothing (at the fuel injector connector) the other should be reading 12vdc.

[timothy_nd28]

No prob,,all of those pins should have 12vdc. I've made a couple of assumptions here, so don't get offended. Are all the fuel injector connectors plugged onto each injector? We know one is plugged in, and making continuity,,this is why your measuring 12vdc at the ECU connector.

With the one pin on the ECU connector reading 12vdc on the previous test,,if you apply ground on that pin, do you hear a click?

I would suggest pulling off each injector lead, then re-seating each connector with a slight wiggle, to ensure a good electrical connection. Then retest those pins at the ECU plug to see if you have any more 12vdc pins. If you have the same results, (one out of 4 has 12vdc),,then pull off each injector lead and probe one of the 2 contacts. With the ECU plug still unattached,,,one contact will measure nothing (at the fuel injector connector) the other should be reading 12vdc.

Do this for each fuel injector connector, keeping in mind that one contact will read 0, and the other will read 12vdc.

[wrightee]

No prob,,all of those pins should have 12vdc. I've made a couple of assumptions here, so don't get offended. Are all the fuel injector connectors plugged onto each injector? We know one is plugged in, and making continuity,,this is why your measuring 12vdc at the ECU connector.

With the one pin on the ECU connector reading 12vdc on the previous test,,if you apply ground on that pin, do you hear a click?

I would suggest pulling off each injector lead, then re-seating each connector with a slight wiggle, to ensure a good electrical connection. Then retest those pins at the ECU plug to see if you have any more 12vdc pins. If you have the same results, (one out of 4 has 12vdc),,then pull off each injector lead and probe one of the 2 contacts. With the ECU plug still unattached,,,one contact will measure nothing (at the fuel injector connector) the other should be reading 12vdc.

Do this for each fuel injector connector, keeping in mind that one contact will read 0, and the other will read 12vdc.

Needless to say, the wire harness and some of the plugs are in poor/marginal condition.

After fiddling a little more, I did get voltage to read on pin 33, so both 32 and 33 show voltage at the ECU plug (cylinders 2 and 4).

I got a good voltage reading at the plug for cylinder 3, but still no reading at pin 15 after reconnecting, and only a very marginal reading (about .6 to .8 volt) at the cylinder 1 plug.

I can not hear any discernable click at the injectors when I ground pins 32 or 33 as well. I stuck my head down in to listen better, as I do have a buzzer sounding with the ignition "on" since taking out the center console and unplugging those gauges.

[wrightee]

No prob,,all of those pins should have 12vdc. I've made a couple of assumptions here, so don't get offended. Are all the fuel injector connectors plugged onto each injector? We know one is plugged in, and making continuity,,this is why your measuring 12vdc at the ECU connector.

With the one pin on the ECU connector reading 12vdc on the previous test,,if you apply ground on that pin, do you hear a click?

I would suggest pulling off each injector lead, then re-seating each connector with a slight wiggle, to ensure a good electrical connection. Then retest those pins at the ECU plug to see if you have any more 12vdc pins. If you have the same results, (one out of 4 has 12vdc),,then pull off each injector lead and probe one of the 2 contacts. With the ECU plug still unattached,,,one contact will measure nothing (at the fuel injector connector) the other should be reading 12vdc.

Do this for each fuel injector connector, keeping in mind that one contact will read 0, and the other will read 12vdc.

Needless to say, the wire harness and some of the plugs are in poor/marginal condition.

After fiddling a little more, I did get voltage to read on pin 33, so both 32 and 33 show voltage at the ECU plug (cylinders 2 and 4).

I got a good voltage reading at the plug for cylinder 3, but still no reading at pin 15 after reconnecting, and only a very marginal reading (about .6 to .8 volt) at the cylinder 1 plug.

I can not hear any discernable click at the injectors when I ground pins 32 or 33 as well. I stuck my head down in to listen better, as I do have a buzzer sounding with the ignition "on" since taking out the center console and unplugging those gauges.

Correction: Full voltage at #3 injector plug, but only about 7 volts at ECU pin 15 after reconnecting.