Hey all I am new to the whole Honda side of things, I am coming from the VW/Audi world and my new fiance is a huge Honda fan. Any way on to the problem, she has a 1999 Civic HX with a "mini-me" swap in it. The problems started after her ex pulled the turbo off of the car.

From there I put back on a stock fuel pressure regulator, injectors and fixed the timing. Currently however the car is throwing code 43 a fuel systems code, I checked and it has a stock fuel pump on the car.

The symptoms of the car are that it will idle fine when it is cold but then acquire a searching idle once it is warm, it will also have a really bad surging problem where you can't even drive the car unless you are at WOT.

I really want to help but have no idea where to go from here and advice or help would be much appreciated.

 

did you check all the plugs for the engine harness....maybe you have a missing hose thats not plugged in....u should check that.

 

If it's suffering that bad when driving, I doubt it's an IACV or FITV issue. I'd look for vacuum leaks...though that won't throw your 43 CEL.

Get a gauge and check the fuel pressure.

 

Followed all wiring harness plugs everything is plugged in. I can start the car and unplug individual sensors and they will throw the appropriate code so I assume the sensors are good.

I keep looking for a vacuum leak because that is what I thought still nothing though. I have a fuel pressure gauge on the fuel line and I am right around 35-40 psi.

This is a real stumper?

 

Ok so a little bit of an update, got the car all back together and drove it this morning. I let the car warm up all the way and drove it for 20 minutes and it ran awesome plenty of power vtec worked perfect.

So as I am driving thinking that I have some how fixed the problem it begins to bog really badly, so I cycle the key and it runs fine for about a minute and then does the same thing.

I continued to drive the car on my commute to work and it finally threw a CEL it was that same code 43. The more I look into this the more I am confused, does anybody have a service manual that could give me some things that I should check?

The funny thing is that after the CEL came on the car began to run a little bit better no more bogging just down on power.

 

So this car had boost, and then it was removed...?

Is the original computer in the car again? If it is, was it chipped previously?

 

Correct, it was boosted currently the car is setup N/A however. I checked the compression and it is around 215-220 across all 4 cylinders.

It was chipped and that chip has been removed and a stock chip is back in it I believe that it is running a p28 ECU and a honda guy who looked at it said that there is a capacitor that you can clip on the board and it will revert back to stock programming and it had already been cut on the board?

We even tried a new ECU and to no avail it still threw codes.

 

bump