Limp mode with no code - 2008 Explorer

[tpaairman]

I'm still working off and of with my 2008 Explorer project. I still may have some issues with the fuel trim, and running lean. It had been driving more or less OK, but kind of rough. I found out that a couple fuel injector wires had bad insulation, so I got that shored up. Now, it seems to be running a lot more smoothly, though not 100%, and while parked, it won't rev over 3500 RPMs, but there are not codes. Is this just because it's running lean?

 

[94Eddie]

I'm still working off and of with my 2008 Explorer project. I still may have some issues with the fuel trim, and running lean. It had been driving more or less OK, but kind of rough. I found out that a couple fuel injector wires had bad insulation, so I got that shored up. Now, it seems to be running a lot more smoothly, though not 100%, and while parked, it won't rev over 3500 RPMs, but there are not codes. Is this just because it's running lean?

Have you tried disconnecting the battery cables and shorting the cables to each other for around thirty seconds to clear learned data?

 

[tpaairman]

Have you tried disconnecting the battery cables and shorting the cables to each other for around thirty seconds to clear learned data?

Yes. In fact, I had them shorted with a jumper wire for about an hour while I needed the battery disconnected anyway to shore up some wiring.

 

[tpaairman]

Just and update for anyone who might come across this. The long story short is it's a rev limiter while the truck is in park.

I was having vacuum leak issues, and needed to replace the fuel filler hose and it's related vent hoses. One of the vent hoses was split, but you have to buy the whole bundle. But, after replacing that, it's now running like it should, and on a test drive, no problems with the RPMs. So when I got back home, I put it in park, and reved the engine, and it tops out at 3500. So it turns out, it's not a limp mode. Just a safety feature. But, prior to that, I didn't try to rev it too high while driving because of the fuel trim issues, and not wanting to damage the new motor.