crazy strange electrical issue
04-30-2006, 06:28 PM
#1
3.0 BAR
Thread Starter
Join Date: Apr 2004
Posts: 9,800
crazy strange electrical issue
went to tune a car today, ran into something new and exciting.
before i get started here, specs...
97 gs-r
obd2-1 harness
370cc high impedance injectors
small nissan t3 (i know)
basic log mani hmt style setup
1. got there, timed the car, gapped some new ngk's, went out on some test runs and started tuning.
2. during last run started noticing his tach was dying out and speedo was too.
3. stop to check it out, couldnt find anything, and car was acting normal again
4. drive it back to his house, shut it off to inspect further just to be safe
5. try to start the car again so we can go fine tune part throttle and call it a day, car wont start
Here is what it does do
1. Cranks over
2. Fires up and immediately dies
Here is what it doesn't do
1. no power windows
2. no clock
3. no fuel pump prime or dash warning lights
Upon further investigation
1. fuse panel not getting power on over half the fuses
2. all fuses in under hood fuse panel have power
Not sure what this could be. Already checked every fuse, not 1 is blown. Tested another ECU in the car as well as tested the ECU's in my car, not the problem. Tested my main relay from my car in his car, not the problem. Checked all connections under hood to make sure none were unplugged or anything. All plugs and grounds/power wires were AOK.
IDEAS?
before i get started here, specs...
97 gs-r
obd2-1 harness
370cc high impedance injectors
small nissan t3 (i know)
basic log mani hmt style setup
1. got there, timed the car, gapped some new ngk's, went out on some test runs and started tuning.
2. during last run started noticing his tach was dying out and speedo was too.
3. stop to check it out, couldnt find anything, and car was acting normal again
4. drive it back to his house, shut it off to inspect further just to be safe
5. try to start the car again so we can go fine tune part throttle and call it a day, car wont start
Here is what it does do
1. Cranks over
2. Fires up and immediately dies
Here is what it doesn't do
1. no power windows
2. no clock
3. no fuel pump prime or dash warning lights
Upon further investigation
1. fuse panel not getting power on over half the fuses
2. all fuses in under hood fuse panel have power
Not sure what this could be. Already checked every fuse, not 1 is blown. Tested another ECU in the car as well as tested the ECU's in my car, not the problem. Tested my main relay from my car in his car, not the problem. Checked all connections under hood to make sure none were unplugged or anything. All plugs and grounds/power wires were AOK.
IDEAS?
04-30-2006, 06:37 PM
#3
3.0 BAR
Thread Starter
Join Date: Apr 2004
Posts: 9,800
Re: crazy strange electrical issue
Originally Posted by chris
That sounds like a ground to me. T-stat one will do some wierd things if not perfect.
I would go over the grounds again for peace of mind
I would go over the grounds again for peace of mind
04-30-2006, 08:48 PM
#5
3.0 BAR
Thread Starter
Join Date: Apr 2004
Posts: 9,800
Re: crazy strange electrical issue
Originally Posted by AbaZ
All the grounds looked at? not just tstat.. body to trans, and body to VC ?
the guy already figured the problem.
the contacts on the electrical portion of the key switch in the column were actually so dirty that it was pulling over 120 ohms of resistance through the connections. factory spec is like .3 ohms. cleaned up the contacts and it works perfectly.
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