Moderator: volvite
..............a compression & leakdown test would answer that.SimulatedZero wrote:
If the cat material sucked back into the piston, how bad do you think the damage would be?
Or you can try and fake out the system by either getting an rear O2 sensor simulator or to try and space out the rear O2 sensor from the direct stream flow of the front exhaust tube.smj999smj wrote:UpRev is the most popular option, but I can't say for sure if it's the "only" one. The ECM fuel management program needs to be remapped to compensate for the modification (or "elimination?") of the converters.
One more thing regarding the P0021, you can remove the ivt solenoid from the cylinder head and check for any clogs. Remove the 10mm bolt and slide the solenoid out the the housing. You can try and and see if there is anything stuck in it. You can also apply 12v and ground to it and check to see if the solenoids move up and down. If the solenoids don't operate by energizing it, you may just have a faulty solenoid! Good luck!SimulatedZero wrote:I can monitor most of the sensors still (primarily o2, fuel trims, etc...) Not sure if I would be able to see that particulat data. I know oil pressure is the issue for sure. You can watch oil seap from the head gasket onto the exhaust manifold anytime I fill it.
First step at this point is to start pulling the covers and replacing the gaskets. I will probably order in everything to reseal everything else while I'm in there. Get oil pressure back and see if fresh oil and good pressure will clear up the solenoid issues.
If the cat material sucked back into the piston, how bad do you think the damage would be?
I don't think so.SimulatedZero wrote:Quick question to add to my options here. Some guys on the Frontier forums did a bunch of digging around about doing a VK55 swap. Do you guys think the 08 Pathfinder VK, wiring harness, and transmission would relatively smooth to drop into an 05? Fairly similar in cost as doing a VQ40 replacement.
That might prevent a P0420/P0430 code from triggering, but it's not going to do anything for the lean running condition. Rear O2 sensors are only monitoring sensors for the ECM to check the efficiency of the catalytic converters and have no affect on fuel management. Replacing the front converters or getting a custom tune for the ECM is the only thing that is going to fix the lean condition caused by gutting or removing the front converters. It's a fairly common issue discovered by those who swapped the factory exhaust manifolds with long-tube headers, which eliminate the upstream converters.element808 wrote:Or you can try and fake out the system by either getting an rear O2 sensor simulator or to try and space out the rear O2 sensor from the direct stream flow of the front exhaust tube.smj999smj wrote:UpRev is the most popular option, but I can't say for sure if it's the "only" one. The ECM fuel management program needs to be remapped to compensate for the modification (or "elimination?") of the converters.
Missed the lean condition part...you are totally correct!smj999smj wrote:That might prevent a P0420/P0430 code from triggering, but it's not going to do anything for the lean running condition. Rear O2 sensors are only monitoring sensors for the ECM to check the efficiency of the catalytic converters and have no affect on fuel management. Replacing the front converters or getting a custom tune for the ECM is the only thing that is going to fix the lean condition caused by gutting or removing the front converters. It's a fairly common issue discovered by those who swapped the factory exhaust manifolds with long-tube headers, which eliminate the upstream converters.element808 wrote:Or you can try and fake out the system by either getting an rear O2 sensor simulator or to try and space out the rear O2 sensor from the direct stream flow of the front exhaust tube.smj999smj wrote:UpRev is the most popular option, but I can't say for sure if it's the "only" one. The ECM fuel management program needs to be remapped to compensate for the modification (or "elimination?") of the converters.