P0087 fuel rail pressure low limp under high loads

[Kennedy]

I recently did a performance tune for LMM and added the same correction. Customer made trip and tells me that he easily would have tripped 12 or more times on this type of run. He thought that he was free and clear, but managed to trip it once just out of the blue. Considering the added demand/load of the tuning this isn't bad. We are taking a wait and see approach and will consider more tweaking if the issue persists.

[Mark Rinker]

Unless that guy is hauling in the southwest, my guess is he will have more issues next summer when higher temps return. Ambient temps which contribute to high fuel temps are a big part of this issue.

I am finishing up a 3000 mile trip today, with a heavy wide boat and through terrain that would have tripped the P00087 many times last summer. So far only two codes set, and that was running hard uphill with a low tank of fuel. The only difference? About 30-40 degrees less ambient fall temps.

This issue is best solved via programming tweaks, but it is clearly a combination of all that has been discussed, including:

• High mile or high fuel volume injectors (i.e. always towing)
• Heavy loaded towing, usually compounded by hills
• High fuel temps, caused by excessive return rates, low fuel level in tank, poor fuel cooling or flow, etc.

If I'm still hauling boats next summer I will buy your finished product, if it can be warranted to solve yproblem. However, my goal is to be in Seattle driving a 2012 ZL1 Camaro by then, although I may be driving my daughters Jetta if I can't find anyone to buy my biz...we'll see which happens first!


Mark @ www.MREBoatTransport.com

[Kennedy]

This trip was made during conditions that would have normally caused the limp numerous times. I'm a bit late in reporting.

Customer is well aware that he's likely delaying the inevitable and that there are NO GUARANTEES and I make this clear in my Tech Tip, but for now if it helps minimize the instances plus increasing the capabilities if in limp mode it's a win-win for most.

Again no guarantees, BUT a willingness to adjust and tweak to work around the issue as needed.

[dually2002]

I have been curious if diesel fuel is formulated for use in a high pressure application like the Dmax. Most of the fuel the pump picks up is by-passed back to the tank so fuel is constantly recirculating and besides picking up heat from the engine it also adds heat from being under pressure. I wonder if a fan located to blow on the fuel heat exchanger would help. Also the fuel constantly be re-circulated and the ultra low sulphur content of the fuel might be reducing lubricating properties of the fuel to the point that it harms the injectors.