Bad Miss After Short Circuit

[johnnyt]

Ok guys had an issue where jumper leads were placed on my gtr the wrong way round...

blew the power fc up.

melted a wire pretty bad at the positive terminal, replaced

now the power fc has been repaired and it seems all the settings and tune are still in the ecu, but now the car will just not run smooth through the rev range. it will idle but as soon as you try and rev through the rev range it just misses and is undrivable.

changed plugs

coilpacks

ignitor

i will be spending the morning diagnosing but if someone has any suggestions or has had this happen before i would love to hear them.

car is a r32 gtr/ to4z all the goodies

thankyou

[our12]

Hi.

Try another battery in it if you havent already. The battery which has been shorted may be the cause. You will more than likely find if its not the problem the battery will not last very long.

[johnnyt]

hooked it up to another one, didnt make a differnce

[jarrod83]

is there any chance that you might of knocked a inter-cooler pipe off and now have an air leak?? are you able to check the simple things like if your getting a good steady voltage and the afr's? maybe try swapping afms or swapping power fc's with someone else and sticking in your tune?

[johnnyt]

yeah gonna have a better look today for air leaks.

getting a steady voltage.

starting to think its shorted the cas

[johnnyt]

ok just pulled the power fc out and put the standard ecu in.. revs freely through the rev range

plug the power fc in and back to lumpy/missing running throughout the rev range

sensor check has ecc

[mr-r33]

ok just pulled the power fc out and put the standard ecu in.. revs freely through the rev range

plug the power fc in and back to lumpy/missing running throughout the rev range

sensor check has ecc

if it drives good with the standard ecu in then maybe the power fc is f**ked

[johnnyt]

hope not... petroject just charged me 340 smackas to fix it

[jarrod83]

i wouldnt conclude that all tho it is a possibility, the standard ecu can run on less power and voltage, and can generally keep things running when somethings not working right.. whereas the car will play up with the power fc.. i had a melted wire in my car and was causing my tacho to play up with the power fc, but would run fine with the standard ecu.. post a help section in ur local state thread for someone with a power fc and datalogit.. so you can switch power fcs n tunes..

[johnnyt]

yeah im looking for pinouts for the power fc and voltages if anyone has them.. starting to think its got a low voltage issue

[mr-r33]

do the ECU have a fuse??? if so could it be possible that it is no good even though it looks good....i know it sounds stupid but what happens when a wire gets old....some times they look good but just can flow the current..

[jarrod83]

i attached the rb20/26 pin out, theres a few fuses that effect the ecu, id have a good look at ur wiring and fuses

Edited April 24, 2010 by jarrod83

[johnnyt]

thanks lad

my ignition timing on the hand controller at idle is showing 28degrees.. i would have thought it would be a fair bit lower than that

[NSNPWR]

i wouldnt conclude that all tho it is a possibility, the standard ecu can run on less power and voltage, and can generally keep things running when somethings not working right.. whereas the car will play up with the power fc...

Does the stock ECU have a power save mode like my laptop? Lol....

[johnnyt]

hmm pretty much checked everything.. it can only be the power fc or the tune

gonna speak to the tuner and see if he has my tune saved, and try doing a rest on the power fc.

any other suggestions guys?