Nothing Works! RPM will not increase above 2000 in D

[TrickyT]

... My speedo doesn't work correctly. When i move at any speed, it shows 80 km/h, and I'm stopped it sits at 0. Those are the only 2 figures it shows.

That may cause the ECU to do strange things. Was the speedo behaving this way before you started have the rev limit problems?

The #1 vehicle speed sensor is connected to the transfer case near the rear driveshaft flange. It drives the combination meter speedometer and that, in turn, tells the ECU how fast the truck is moving. There's also a 2nd speed sensor connected to the A/T. It's not clear how the ECU uses these two speed signals or what happens if one of them is out of whack. Bottom line is that if your speedometer started to misbehave at the same time as the rev limit problem I'd get that fixed before anything else.

 

[Bodda]

What does he mean by "clogged?" That's not a diagnosis. You said it revs fine in L and 2, then it doesn't need an overhaul.

I'll take your word over his. He was saying that the PO had probably used the truck for long distance travel, which he did. This, he said, makes the engine weak as it is used to low stress but high speed travel. He said the solution is either to do an overhaul, or drive at maximum speed for about 30 mins until the engine is 'revived' again. What do you think, hogwash?

 

[Kfire01]

I'll take your word over his. He was saying that the PO had probably used the truck for long distance travel, which he did. This, he said, makes the engine weak as it is used to low stress but high speed travel. He said the solution is either to do an overhaul, or drive at maximum speed for about 30 mins until the engine is 'revived' again. What do you think, hogwash?

Well, I won't say hogwash, but it doesn't really make much sense. A motor is just a piece of machinery, it doesn't know if what type of miles you are putting on it. If he was correct, every car that had alot of highway miles on it would act like yours. Just doesn't happen. Your description suggests it runs properly under certain conditions, and improperly under others. That tells me you have a component problem, maybe a clogged cat, maybe an ECU or transmission issue. The good thing about cruisers is the FSM is written so that you can troubleshoot just about any issue. Hope that helps.

 

[Bodda]

That may cause the ECU to do strange things. Was the speedo behaving this way before you started have the rev limit problems?

The #1 vehicle speed sensor is connected to the transfer case near the rear driveshaft flange. It drives the combination meter speedometer and that, in turn, tells the ECU how fast the truck is moving. There's also a 2nd speed sensor connected to the A/T. It's not clear how the ECU uses these two speed signals or what happens if one of them is out of whack. Bottom line is that if your speedometer started to misbehave at the same time as the rev limit problem I'd get that fixed before anything else.

I actually purchased the truck with both the speedo not working and with this issue. So I can't say if this problem started to happen at the same time as the speedo started to misbehave. I should also say that when in 2, the truck starts in first, then shifts at 2000 RPM exactly every time. When it shifts to second, the RPM increases normally. There is something peculiar going on with the 2000 RPM threshold.

That being said, if it is the speedometer sensors, how do I fix it? You mentioned there are two sensors, do I just buy them both new and replace the ones I have?

 

[TrickyT]

It's speed sensor #1, which is bolted to the transfer case near the rear driveshaft, that drives the speedometer in the dash. But I would not just throw money at the problem and hope that fixes it. It may be the sensor or the speedometer in the combination meter or wiring or a bad connector. More troubleshooting is called for before buying parts. And I'm only saying the wacko speedometer could possibly cause the 2K rev limit issue, not that it is the cause.

If you bought the vehicle in this condition, then you need to find a mechanic who really knows Land Cruisers. I mean someone who has worked on them for years and has a lot of vehicle-specific knowledge and not just general automotive knowledge.