Stalker

Well I just got my car back from the shop because I had it checked for a few problems. The guy at the shop told me that some of the problems could be because I have an OBD-1 ecu in my 99 civic si. I was wondering if that would cause problems with my car. He said that it was just spliced together which I am assuming is a bad thing....

PDiggityDogg

What ecu are you using? p28 or p30? If p28, is it chipped?
Lets see a pic of the wiring...

swaggs21

What do you have done that you need an OBD1 ecu?

The si comes with ODB2b ecu, but the obd1 would just ignore all of the obd2 stuff.

And if it was put in bad (like a bad harness) then that is possible, could cause it short out.

Stalker

Well I just bought the car and found out it had an ODB-1 in it. The guy at the shop told me it was an ODB-1 and I don't really know a whole lot about them so I don't know what kind it is or if it is chipped? Should I go ahead and replace it with an ODB-2? Would this affect the performance or anything?

PDiggityDogg

ECU's have a sticker on one side (bar code side) that has a slew of digits. In about the middle it will say P30, P28, P2P, etc. Find out what that code is first.

If you dont know I suggest you remove it, open it up, and take pics so we can tell you if its chipped or not. A p30 does not need to be chipped, but a p28 does.

Running the wrong program could be the source problem that youre having.

Stalker

It's a p28 ecu could post some pics if you want....

PDiggityDogg

I think it'd be best if you got some pics of the wiring for it and a pic of the inside, so we can see if it's been chipped or not

Stalker

PIcs....

Stalker

...

Provocateur

Damn, what did he do to that harness?

Anyways, it isn't chipped.