10-28-2021, 08:42 AM
Thanks Kick!
Still waiting for the ECU replacement to arrive - but I may have made some headway using the ECU I already have.
I did a bunch of the ECU voltage tests and continuity tests. I of course removed the red fuel injector hot wire, so eveything is wired as it should be.
With key in on position I'm getting over 12 volts to power source pins (B7 for example).
The brown tach wire gave me over 11 volts so I guess it meets spec. I still might want to route a new brown wire just as a test.
Resistance test for fuel injector between red and yellow wire gave me 1.5 ohms, within spec (at ECU terminal B8 and B17).
What I did next: I removed the TBI cover so I can take a look at the injector. I cleaned everything with carb cleaner too.
I started the motor and it was running, 2000rpm I think. The injector seemed to pulse and spray correctly in a cone like matter. After 30 seconds or so the idle started coming back down, and then I noticed the fuel injector was "misfiring", as if it would only intermittently inject. It did this until the motor died. Sometimes I would give it gas which would rescue the injections, but when back down to idle it looked like the injector was "misfiring".
One note: I feel that my FPR works fine because I dont see gas dribbling from the vacuume hose. Have yet to do the real test using a pressure tester.
Can improper EGR vacumming cause any of these symptoms?
I noticed one of the metal nipples on my EGR valve (the one that connects to the EGR modulator via the thicker vacuum hose) is broken off. Could this be causing the car to stumble and die?
Still waiting for the ECU replacement to arrive - but I may have made some headway using the ECU I already have.
I did a bunch of the ECU voltage tests and continuity tests. I of course removed the red fuel injector hot wire, so eveything is wired as it should be.
With key in on position I'm getting over 12 volts to power source pins (B7 for example).
The brown tach wire gave me over 11 volts so I guess it meets spec. I still might want to route a new brown wire just as a test.
Resistance test for fuel injector between red and yellow wire gave me 1.5 ohms, within spec (at ECU terminal B8 and B17).
What I did next: I removed the TBI cover so I can take a look at the injector. I cleaned everything with carb cleaner too.
I started the motor and it was running, 2000rpm I think. The injector seemed to pulse and spray correctly in a cone like matter. After 30 seconds or so the idle started coming back down, and then I noticed the fuel injector was "misfiring", as if it would only intermittently inject. It did this until the motor died. Sometimes I would give it gas which would rescue the injections, but when back down to idle it looked like the injector was "misfiring".
One note: I feel that my FPR works fine because I dont see gas dribbling from the vacuume hose. Have yet to do the real test using a pressure tester.
Can improper EGR vacumming cause any of these symptoms?
I noticed one of the metal nipples on my EGR valve (the one that connects to the EGR modulator via the thicker vacuum hose) is broken off. Could this be causing the car to stumble and die?