RE: Misfire w/o CEL?
 

No, they have different ECU. I replaced it when I did the swap.

RE: Misfire w/o CEL?
 

Yeah, now I better understand your focus on the wiring.

RE: Misfire w/o CEL?
 

Can you tell me how you rewired the O2 sensor to the ECU. Also, where did you find the pin out for the original O2 sensor 4-pin connector?

RE: Misfire w/o CEL?
 

Okay, the number on the left corresponds to the plug C123 on pg 202-5 and the number on the right corresponds to the pins/connectors (pg 202-26) that plug into the ECU.

#1 Blk/Wht > #6 on Connector A
#2 Blk > I gounded it in the engine bay
#3 Grn/Blk > Grounded in the engine bay
#4 Wht > #7 Connector D
#5 Empy
#6 Wht > #25 Connector C
#7 Blk > #23 Connector C
#8 Red > #24 Connector C

RE: Misfire w/o CEL?
 

Ok, what about this...I grounded wires #2 & #3 in the engine bay (I figured grounded was grounded), but if you look at the top-right diagram on pg 11-147 it says that that wire #3 (Grn/Blk) is supposed to be plugged into #11 on Connector D. Might that cause a problem?

RE: Misfire w/o CEL?
 

Yes, definitely rewire #3 to ECU D11. Otherwise, I agree with your wiring. See Page 23-13 of Electrical Index section (actual page 1891 of 96-00 manual) for additional confirmation of your wiring. I expect that the #3/D11 change will resolve your problem. Good luck.

RE: Misfire w/o CEL?
 

Well, I wired #3 into #11 on Connector C...no dice. Still having problems. I guess the next step is to pull out the O2 sensor plug/wires and start testing continuity, voltage, etc. as per the instructions on pg 1891. I'll try and get to it sometime this week. I'm burned out and frustrated right now...bah!

RE: Misfire w/o CEL?
 

Dang! You probably just made a typo, but the #3 wire goes to terminal 11 of the ECU D connector not the ECU C connector.

Just a thought: It may be important for wire #2 to be grounded to the specific location indicated in the manual. This is the only other possibility that I can think of to explain the sensor not working.

Don't worry. After your get some rest, you'll figure it out.

RE: Misfire w/o CEL?
 

Is it possible my timing's off, RonJ?

RE: Misfire w/o CEL?
 

Yeah, given that the CEL is OFF with the O2 sensor connected, checking the timing seems like a good idea. Also, how you categorize the misfiring in the chart (see post #8 of this thread) might suggest additional components to troubleshoot if the timing were fine.

I guess the dilemma is that disconnection of the O2 sensor lessens your misfire problem. This observation may indicate that the sensor is making O2 readings but they are incorrect. Maybe the #2 wire needs to be attached to the specific ground location shown in the manual to make proper readings? Alternatively, maybe the new O2 sensor is defective? Are you able to use a scan tool to test whether the O2 readings make sense?