I know all have had lost of speculation, too much power, bad gas, bad tune, etc..
From everything we've come to investigate about the engine. Our best guest the cause of the problem was the Caspers Electronics o2 extension harness.
After putting the new engine back in the car, we had issues right out of the gate with random o2 codes on bank 2. SCT Data logger was randomly not picking up a/f out of bank 2. 95% of the time, getting no reading.
I bought 2 new o2's thinking the old ones possibly got oiled from when the motor let go.
Put them in, and immediately had the same codes and no a/f. One time it would be o2 sensor code, then heater circuit code. etc.. All random codes related to the o2 sensor on bank 2.
We pulled the new o2's back out of both sides and got to looking at them closely. What we found was a little interesting. The passenger side, which had no harness extension, when you look at the holes the o2 plugs into. There is gold (connector) right at the tips of the holes.
On the Caspers harness. The gold (connector) is recessed inside the hole nearly half an inch. On top of that, the clip was busted on the connector. My guy at the shop said, hmmm, makes sense now. I asked what he was referring to. Originally the engine builder sent me a pic of one piston. I thought only one was gone. Turns out that all 4 bank 2 pistons were ate up. 5,6,7, and 8. The guys at my shop said that there was my problem.
More than likely, there was very little connection in the harness. When the clip broke, not enough connection to hold. We played around with the stock harness for a bit and was able to move it around and plug the factory harness in to the o2 without the connector.
Jump into the car, fire it up, and voila! No o2 codes and a/f was reading fine.
At Bradenton this past week, I was talking with my tuner and started talking to him about the harness. As soon as I mentioned header harness, he got a faint grin, not laughing, but like knowing what I was going to say.
He told me the American Racing shop car had tuning issues for a few weeks. He was remote tuning the car, and told them there was no issues with the car, it had to be somewhere else. They discovered the same thing, the harness was the issue with the car.
There was also another car that showed up at the NMRA race that was having similar code issues. Turns out he has headers with the same harness. (everyone uses these harness').
Also talked to Justin from VMP, told him my findings, he told me that he had recently went to order some of the harness' from Caspers and they told them they were "redesigning" the harness because of the clips breaking.
I talked to them myself today, moreso about the connector vs the clip. He said they use oem connectors. I assured him the connectors look nothing like oem. Then he told me they are "bosch" oem connectors.
Again, best guess is the clip had broken at some point and lost connection, more than likely under wot. John Lund explained to me that these cars when they don't pick up a reading, default to a 14 to 1 a/f.
More than enough to detonate a s/c'd Coyote at WOT.
Bank 1 was completely untouched in the engine as well.
So, there ya have it.
From everything we've come to investigate about the engine. Our best guest the cause of the problem was the Caspers Electronics o2 extension harness.
After putting the new engine back in the car, we had issues right out of the gate with random o2 codes on bank 2. SCT Data logger was randomly not picking up a/f out of bank 2. 95% of the time, getting no reading.
I bought 2 new o2's thinking the old ones possibly got oiled from when the motor let go.
Put them in, and immediately had the same codes and no a/f. One time it would be o2 sensor code, then heater circuit code. etc.. All random codes related to the o2 sensor on bank 2.
We pulled the new o2's back out of both sides and got to looking at them closely. What we found was a little interesting. The passenger side, which had no harness extension, when you look at the holes the o2 plugs into. There is gold (connector) right at the tips of the holes.
On the Caspers harness. The gold (connector) is recessed inside the hole nearly half an inch. On top of that, the clip was busted on the connector. My guy at the shop said, hmmm, makes sense now. I asked what he was referring to. Originally the engine builder sent me a pic of one piston. I thought only one was gone. Turns out that all 4 bank 2 pistons were ate up. 5,6,7, and 8. The guys at my shop said that there was my problem.
More than likely, there was very little connection in the harness. When the clip broke, not enough connection to hold. We played around with the stock harness for a bit and was able to move it around and plug the factory harness in to the o2 without the connector.
Jump into the car, fire it up, and voila! No o2 codes and a/f was reading fine.
At Bradenton this past week, I was talking with my tuner and started talking to him about the harness. As soon as I mentioned header harness, he got a faint grin, not laughing, but like knowing what I was going to say.
He told me the American Racing shop car had tuning issues for a few weeks. He was remote tuning the car, and told them there was no issues with the car, it had to be somewhere else. They discovered the same thing, the harness was the issue with the car.
There was also another car that showed up at the NMRA race that was having similar code issues. Turns out he has headers with the same harness. (everyone uses these harness').
Also talked to Justin from VMP, told him my findings, he told me that he had recently went to order some of the harness' from Caspers and they told them they were "redesigning" the harness because of the clips breaking.
I talked to them myself today, moreso about the connector vs the clip. He said they use oem connectors. I assured him the connectors look nothing like oem. Then he told me they are "bosch" oem connectors.
Again, best guess is the clip had broken at some point and lost connection, more than likely under wot. John Lund explained to me that these cars when they don't pick up a reading, default to a 14 to 1 a/f.
More than enough to detonate a s/c'd Coyote at WOT.
Bank 1 was completely untouched in the engine as well.
So, there ya have it.
