Tune won't stick
Posted: Fri Mar 14, 2008 1:35 am
I have an sr20det in a usdm 240sx chassis it has run fine for ~3 years and i have been succesfully tuning with the nistune hardwarer installed for ~8months.
Until last week, i was running z32 maf and 550cc injectors all was well and then the car started missing and afr's were all over the place in O2 flagged regions.
I pulled the ECU and wiring harness and discovered pin 17 (maf ground) had melted it's sheathing, I opened the ecu and D411 (a diode) had burned so i replaced the diode and connected the shielding to the chassis ground on the MAF
started the car and had to play with the K constant to get the car running of an old tune (went to about 140% to idle correctly) clicked apply burned changes to the ecu, went home and slept, woke up and started the car, it was back to not running right, so i opened the K constant and moved it again to ~140% clicked apply and burned changes turned it off and ten minutes later we're back to not running right.
Did I become insta-stupid?
Someone tell me what's up please.
Mike From San Pedro
Until last week, i was running z32 maf and 550cc injectors all was well and then the car started missing and afr's were all over the place in O2 flagged regions.
I pulled the ECU and wiring harness and discovered pin 17 (maf ground) had melted it's sheathing, I opened the ecu and D411 (a diode) had burned so i replaced the diode and connected the shielding to the chassis ground on the MAF
started the car and had to play with the K constant to get the car running of an old tune (went to about 140% to idle correctly) clicked apply burned changes to the ecu, went home and slept, woke up and started the car, it was back to not running right, so i opened the K constant and moved it again to ~140% clicked apply and burned changes turned it off and ten minutes later we're back to not running right.
Did I become insta-stupid?
Someone tell me what's up please.
Mike From San Pedro