What The Hell Is This!?

[Ki_spirit]

Hi guys.

Have owned a 93' ECR33 GTS-T for a month and a bit now. Have been tinkering to find a couple of questionable things with the car.

I took the kick panel off to find my wiring loom all messed up, with wires swapped around and something that looks like a form of piggy-back computer taped to my wiring?!

Can anybody please tell me what this is?

I talked to the previous owner a number of times, with him saying that the ECU has been remapped because he was having issues with the car misfiring @ 5000rpm (yes, I know how to fix this issue).

He replaced the AFM, only for me to find it tampered with, so I replaced it with another unit.I then discovered that the wiring had been swapped around with the signal wire connected to the ground wire from the unit!...

Communication is no longer possible with the previous owner, as he has become very reluctant to talk to me in relation to anything relating to the car.

I thought I would come on here first and ask to see if anyone could point me in the right direction instead of being screwed around locally by mechanics when they don't know what they are talking about and asking for money for no-fix.

The only reason I can think of why these things would have been done, is MAF metering to the ECU being changed due to the running of some piggy back system.

The wiring loom has been extensively screwed around with and I am too scared to untape it all and take it apart for fear of what I may find and issues in running as this car is my daily.

I definately know that wiring from the AFM has been altered at the loom and spliced with other wires as well as being altered at wiring near the AFM itself.

I am getting hurrendous fuel economy between 3/4 and 1/4 full, sometimes only getting 150+ k's to this region of the tank, but economy seems to be half reasonable when the tank is full and getting close to empty, otherwise the guage is just playing with me.

When I start the car over 1/4 of a tank full, I get a strong smell of fuel vapour hissing leaking from the relief valve near the filler of the fuel tank. The previous owner insists that the fuel lines have been replaced from front to back and I cannot find any leaks myself...

I know that some of the economy issues may be influenced by the potential 'mapping' if any of the computer and thing strapped to my loom. I am mechanically minded and electronically literate, so if I know what I can do to fix it, I will work on it meticulously to get it right.

Other things to consider in my case:

- Stock turbo running 10 psi

- Boost bleed valve

- 'mapped?' ECU or thing strapped to my loom

- Modified factory relief/BOV - sounds like it is venting to atmosphere, well, loudly inside the turbo inlet which can't be condsidered the inlet manifold and isn't quiet like stock. Owner mentioned filling in a small hole with a welder to hear the sound from the wastegate, which I am guessing is the plumb back outlet from the wastegate to the inlet manifold.

- 3 1/2 Cat-back exhaust if that is a factor.

- Spark plugs recently cleaned and coil packs epoxied - although I will have to do further work on them as I still get the misfire.

Recently I have recorded fuel consumption, using a full tank, with 335 km's to a tank and thats not even heavy on the pedal

Highway driving seems to yield the same results and is no more economical than city driving, well, nothing noticable.

Please, if anyone can shed some light on this subject, I would be ever so greatful. I live on the Sunshine Coast and would be willing to meet up with someone locally if they can help me in any way.

Thanks for reading.

Sam.

Edited May 4, 2008 by Ki_spirit