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180SXXXX

Diagnostic mode on stock ecu

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As many know,for YEARS ive tried to get my car to run right and even 4-5 jap tuners could not fix the 180 as it had TERRIBLE flat spots,miffire,bogging down. I went to somewhat of a Jap car whiz today who lives near me and specialises in 300ZX's ,I was there for hours and we did a compression test = 2 pots were 150 and other 2 were 145,Leakdown test done too = all good.

 

at one point in the day he grabbed another ECU ( stock) , mine is chipped ,we then fitted his ECU and took the car out for a spin and it now boosted all through the rev range for once!!!! and pulled hard like never before. We get back to his place and check my ECU and ive left it in " DIAGNOSTIC MODE!" ,he says left like that it alters certain operations in the ECU and I am now wondering if this is correct and has been the trouble all along?.

 

So is this correct that if your driving about and the ECU is left in Diagnostic Mode that the car will not function correctly?,it still has a bit of missfire but the guy seems to think its nothing to worry about??,all in all it now drives like it never has before......

Edited by 180SXXXX

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About time you made progress!! You must be ecstatic

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About time you made progress!! You must be ecstatic

Well yes but also feel retarded,cause it was something that never crossed my mind,both my ECU's performed with the same symptoms( my chipped one and fully stock one) and looks like both were in Diagnostic mode!.

 

For once it actually boosts up correctly! but still feels slightly held back,I need to test further and report back,we popped in some Iridium Plugs the guy had and are still in there now,I'll try my copper plugs again and see if it changes performance?

Edited by 180SXXXX

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Holy hell man, congratulations!

 

You should really give yourself a huge pat on the back for sticking with it over the years too man; A lesser man would have sold it to someone else, but it's great to hear that it's finally working well.

 

As always, keep us up to date, and let us know when the party is planned.

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Still think you should get a power fc and some proper mods on there, save your cash and do everything once and properly

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It drives HEAPS better but still not 100%,sometimes it boosts much harder than other times? and still missfires.

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Hey guys, when we tested the power going to the Coilpacks ( with a Multimeter) it was showing 12.6 volts) and the battery was showing 13.5 volts, this was the car not running.

 

Is this slightly lower reading to the coil packs liable to cause any lower performance issues??, Coil pack Harness is brand new and earth is clean so dunno why its lower.....

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i also dont know why your battery is showing 13.5 volts with the car not running, seems a touch high to me, yet might be a different to normal battery.

 

the drop is a bit bigger than i normaly see, yet really good to see you made some progress with your car, how did u get the ecu out of diag mode?

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i also dont know why your battery is showing 13.5 volts with the car not running, seems a touch high to me, yet might be a different to normal battery.

 

the drop is a bit bigger than i normaly see, yet really good to see you made some progress with your car, how did u get the ecu out of diag mode?

 

I let the local Nissan Whiz guy do it,I think he just turned the little screw on the ECU fully the other way,I had it turned the wrong way!?.

 

My battery is nothing special,its really quite small as well ,its just an EXIDE 40C http://www.exide.com...d/endurance/40c it was the only battery I could find that would fit in the 180SX next to the GKTECH Cooler Pipe. I bought it back on 17/ 10/08 !

Edited by 180SXXXX

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