getting rid of electric carb/dist.81 vet
12-13-2016, 07:39 PM
#21
Have you checked the gauge fuse? I believe that is the ECM power source. (Old memory).
Last edited by Big2Bird; 12-13-2016 at 07:39 PM.
12-13-2016, 08:18 PM
#22
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****LONG RELPY****
Bill,
There is no way in knowing if it is in OPEN LOOP or CLOSED LOOP. The O2 sensors is the 'switch' so-to-speak in what makes the ECM go from OPEN LOOP to CLOSED LOOP when it gets hot enough. BUT it can kick out of OPEN LOOP and go back into OPEN LOOP if fuel is dumping into it.....thus cooling down the O2 sensor and make it switch back and forth. And not being able to watch this on a scanner....would be like siting beside glacier and waiting to see it move.
How it is running...better or worse is all a guessing game with you throwing parts at it and hoping for the best....because....IF you can not communicate with the ECM...that is all you are doing. Blindly guessing that something may work.
Do you remember in our conversation when I talked about that customer I had did work at home and replaced LITERALLY every sensor on the 89 Tuned-Port engine. AND it still did not fix his problem UNTIL he brought it to me and I replaced the BOGUS aftermarket ECM in it with A GM one. And the one I recently repaired that is just like yours...no communication.....and I replaced the ECM and chip and that fixed it.
This is not hard to do or fix and get right...because oddly enough I was just like many who may read this. I knew absolutely NOTHING....but now...it is no big deal and there is NOTHING to be afraid of.
And like in our discussion...if you are having someone do this work for you...it will be up to them to TAKE THE TIME and check the wire that I thoroughly explained to you about how I would do it if your Corvette were sitting in my shop. This is so you do not go and put a new ECM and chip in and find out that you had a broken wire like I mentioned CAN HAPPEN.
I do not know what more I can do for you but other than guess....and I really do not like doing that when I know what needs to be done. And this is only from my person experience when working on these Corvettes for my customers. I felt that in our phone conversation I tried to make it clear on what the next step was so you and your tech would not waste time. It is totally up to you on what you choose to do.. Until you decide to check the wire...and find that it is GOOD....then correctly get the ECM/chip installed with a GOOD ECM...I honestly do not know what more I can do. Because IF you can not read data...you know nothing at all to how the ECM is responding to sensor inputs.
Somethings in life are basically set in stone. Kinda like if a person wanted hard boiled eggs. If that person just puts the eggs in water...they will never get hard boiled eggs. They have to boil water. So trying to keep a computer controlled engine running correctly and NOT being able to see what the computer is doing...is as you can probably guess from what i have already stated.
YOU ARE NOT ALONE in this. I will not leave you 'hanging out to dry'. But I can not help you if the steps I advise on are not preformed. the choice is up to you.
DUB
Bill,
There is no way in knowing if it is in OPEN LOOP or CLOSED LOOP. The O2 sensors is the 'switch' so-to-speak in what makes the ECM go from OPEN LOOP to CLOSED LOOP when it gets hot enough. BUT it can kick out of OPEN LOOP and go back into OPEN LOOP if fuel is dumping into it.....thus cooling down the O2 sensor and make it switch back and forth. And not being able to watch this on a scanner....would be like siting beside glacier and waiting to see it move.
How it is running...better or worse is all a guessing game with you throwing parts at it and hoping for the best....because....IF you can not communicate with the ECM...that is all you are doing. Blindly guessing that something may work.
Do you remember in our conversation when I talked about that customer I had did work at home and replaced LITERALLY every sensor on the 89 Tuned-Port engine. AND it still did not fix his problem UNTIL he brought it to me and I replaced the BOGUS aftermarket ECM in it with A GM one. And the one I recently repaired that is just like yours...no communication.....and I replaced the ECM and chip and that fixed it.
This is not hard to do or fix and get right...because oddly enough I was just like many who may read this. I knew absolutely NOTHING....but now...it is no big deal and there is NOTHING to be afraid of.
And like in our discussion...if you are having someone do this work for you...it will be up to them to TAKE THE TIME and check the wire that I thoroughly explained to you about how I would do it if your Corvette were sitting in my shop. This is so you do not go and put a new ECM and chip in and find out that you had a broken wire like I mentioned CAN HAPPEN.
I do not know what more I can do for you but other than guess....and I really do not like doing that when I know what needs to be done. And this is only from my person experience when working on these Corvettes for my customers. I felt that in our phone conversation I tried to make it clear on what the next step was so you and your tech would not waste time. It is totally up to you on what you choose to do.. Until you decide to check the wire...and find that it is GOOD....then correctly get the ECM/chip installed with a GOOD ECM...I honestly do not know what more I can do. Because IF you can not read data...you know nothing at all to how the ECM is responding to sensor inputs.
Somethings in life are basically set in stone. Kinda like if a person wanted hard boiled eggs. If that person just puts the eggs in water...they will never get hard boiled eggs. They have to boil water. So trying to keep a computer controlled engine running correctly and NOT being able to see what the computer is doing...is as you can probably guess from what i have already stated.
YOU ARE NOT ALONE in this. I will not leave you 'hanging out to dry'. But I can not help you if the steps I advise on are not preformed. the choice is up to you.
DUB
12-14-2016, 06:08 PM
#23
Race Director
If this thread goes dead due to you not posting and keeping it alive. If you need my thoughts...you will want to PM me if you reactivate it months later....or call me...which is fine also.
DUB
12-14-2016, 06:11 PM
#24
Race Director
12-18-2016, 11:15 PM
#27
Missed alot of what has been posted up until now.
Like DUB to me it sounds like a problem with your ECM.
But since your engine dies when the m/c solenoid is connected it there must be other problems as well (it must be running lean for this to occur). my guess for these would be vacuum leaks or incorrect carb settings (or both).
Like DUB to me it sounds like a problem with your ECM.
But since your engine dies when the m/c solenoid is connected it there must be other problems as well (it must be running lean for this to occur). my guess for these would be vacuum leaks or incorrect carb settings (or both).
12-19-2016, 11:33 AM
#28
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Missed alot of what has been posted up until now.
Like DUB to me it sounds like a problem with your ECM.
But since your engine dies when the m/c solenoid is connected it there must be other problems as well (it must be running lean for this to occur). my guess for these would be vacuum leaks or incorrect carb settings (or both).
Like DUB to me it sounds like a problem with your ECM.
But since your engine dies when the m/c solenoid is connected it there must be other problems as well (it must be running lean for this to occur). my guess for these would be vacuum leaks or incorrect carb settings (or both).
to all have a great holiday, bill