Okay, we started with a 91 HF. Swapped in a 92 d15 from a DX hatch. No CEL'before the swap.
Basically just changed the block and IM / throttle body. Kept the HF dizzy and injectors.
Stated getting a CEL (one flash) for oxygen? We kept the same o2 sensor with one wire and it LOOKS fine. CEL comes on after a few minutes sometimes and other times it won't come on till after an hour of driving. When the light comes on the motor runs rough.
Could this be a faulty o2 sensor?
The one thing different about the IM is on the passeenger side there is some kind of sensor with a white three wire plug and a vacuum hose. We plugged the vacuum line and left the plug undone.
Anyone have an idea what we need here?
Thanks for the help.

 

so you put a 92 d15 block and head but re-used the 91 hf IM/TB and Inj?

what ecu did u use?

 

No, we used the DX block and head, intake manifold and throttle body. We kept the HF ECU and distributor. We also kept the HF injectors because the connectors were different for each motor. I believe they flow the same though.

 

what what code is it throwing? cel 1?

 

Yes, CEL 1 (one flash)

 

how is the fuel consumption?

 

Seems to be using more gas.

 

HF engine harness?

 

What happens when the check engine light comes on does the ecu try to fix the problem and make it run worse? anybody got a answer?

 

Yes to the HF engine harness

 

Hi Brah,
The ECU does not try to fix the problem but goes into a "closed loop" default mode that stops constantly adjusting the air / fuel mixture. Instead it just stays at one setting.

By the way everyone, it is redfish's car. I was posting for him.

 

Bump...

No ideas?

 

Looks like no help bro. I am suffering with the small wave pattern. I will be putting the clutch in the green car this weekend and proably drive it to Ca. for the surf trip. Latter

 

yO! I put this in the tech forum. See if we can get an answer there.