Fuel Injectors and knock sensor harness
I have been feeling like this truck is down on power, especially since riding in a friend's runner. I did briefly get a misfire code a couple weeks ago that went away and hasn't been back. I know the ignition components are good, so it has to be fuel. I figured if the stock injectors have made it 273k miles, they are probably pretty tired. I ordered a set of OEMs, at least advertised that way, and figured I'd do knock sensors and knock sensor wire while I was that far down in there, since that could cause problems later in life.
First I checked resistance on the front 2 injectors on the passenger side, since they are easy to get to. 19 and 22 Ohms, that's pretty far out of spec.
New Injectors look slightly different than the old ones, once removed but have Arram on the side and seem well made. They had 14.1-14.4 Ohms resistance, much better.
The new knock sensors were suspect. Both advertised as Denso, they both arrived in a carboard box, wrapped individually in bubble wrap, both say Denso, but one looks odd. It has a hole in the bottom, there the threads are, also the word Denso looks like a bad casting. Seems like a knock off part. I elected not to install them, and will be requesting a refund. Knock Sensor harness is cheap and arrived in a sealed Toyota bag, good to go.
@%1; gave me a hand with this operation today and it was a success. It took us around 4.5 hours to do this. We also wrapped the wire harnesses by the valve covers with wire loom. The casing cracked off while doing the valve covers and it was bugging me that the wires were rubbing on the valve covers with no protection.
It was determined that removing the hood would be easier to get the work done, so it was removed. I'd highly recommend doing this when working under the hood for any period of time. It would probably be had to do alone, but with a hand, it's simple and adds about 5 minutes total to your job.
Valves look pretty good, but I have a ton of oil in the front passenger and rear driver cylinder head intake ports.
The fuel injector ports were pretty disgusting, as was the whole lower intake inside and out. Something made a nest down in there at some point.
Old fuel injectors look like they've seen better days. After checking resistance after they were out, all were around 16.8 Ohms. I'll be keeping them in case the new injectors don't work out. The 4 ports under the actual injector didn't line up perfectly with the 2 holes in the tip, on the new ones, but did on the old ones.
Time to reassemble, was a pain in the ass to get the fuel rail back on straight, probably took about an hour to do.
That wire loom:
Got it all back together and took it for a spin with the hood off, because why not.
Overall, it feels a little smoother, much better power above 3000 RPM, feels similar under 3. This truck runs well as long as the temp is below exactly 80 degrees. Whenever it's hotter than 80 it's a total dog, so we'll see how it holds up in the long run. Today was a cool 74 degrees in Central Texas.
