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  #26  
Old 01-09-2019, 10:56 PM
robertf robertf is online now
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Quote:
Originally Posted by jymmiejamz View Post
Idling at 1500-2000 RPMs is pretty common with GEMS. The way I've always fixed it is reset the throttle adaptions. I'm not sure if you can do that with an aftermarket scan tool.
you can with the right software
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  #27  
Old 01-10-2019, 10:48 PM
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Quote:
Originally Posted by robertf View Post
That's really cool, I had no idea that existed. I have a Snap On scanner that I mostly use for 14CUX, but I don't think it can reset the throttle adaptions.
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  #28  
Old 01-12-2019, 09:53 AM
mrbieler mrbieler is online now
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drove it about 100 miles and the codes cleared up and passed smog. still getting p0451. will check the cap and evap lines for leak, but it's running nicely otherwise.
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  #29  
Old 01-12-2019, 06:31 PM
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PM sent
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  #30  
Old 01-14-2019, 11:25 AM
geoellis geoellis is offline
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New wire from the ECU to the TPS did the trick?
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  #31  
Old 01-14-2019, 12:10 PM
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Yes. The wire overlay restored the voltage to the TPS and our truck runs great. I’m still getting P0451 code, which leads me to believe I’m still having an issue with the fuel pump sensor or the evap system.

Now that I’ve passed smog and have the truck running properly, I can work on that.
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  #32  
Old 01-14-2019, 12:16 PM
geoellis geoellis is offline
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Nicely done.
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  #33  
Old 01-14-2019, 11:45 PM
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Quote:
TPS is showing low voltage, but the ECU and all wiring connections, including wires that share leads with the TPS are showing good.
What was wrong with the wire if the wires were "showing good"
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  #34  
Old 01-15-2019, 10:31 AM
mrbieler mrbieler is online now
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We're not sure. We were showing continuity along the harness, but with everything plugged in we were getting under 1volt at the tps.

The original TPS and the cleaned up original ICV are back in. Once we found the parts were functional, I put them back in rather than the aftermarket replacements.

I think the earlier comments pointing back to the fuel sensor are the issue. Taking the TPS off that wiring circuit appears to have cleared up the issue, but the error code is showing P0451 which I wasn't seeing before. Need some down time in the coming weeks to take look at that. No free weekend time coming up for bit though. Be nice if the fuel sensor wasn't molded into the fuel pump assembly...

Right now, all appears well. Good performance road and highway. Back to the regular 13MPG around town average.
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  #35  
Old 01-15-2019, 01:41 PM
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On my first Disco I had P0451 for a while. If I recall, that is an evap code. After chasing my tail on it I finally figured out that the previous owner had installed a non-AEL fuel pump into an AEL truck. Symptoms were similar to what you describe. Might be worth a quick look to verify that you have the appropriate pump for your truck. I think 1997 was the changeover year (LR sold both) so it's possible you have an AEL fuel system with a mismatched pump. I don't know if the reverse mixup is problematic - AEL pump in a non-AEL truck.
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  #36  
Old 01-15-2019, 01:58 PM
Swedjen2 Swedjen2 is offline
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AEL?
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  #37  
Old 01-15-2019, 02:08 PM
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Advanced evaporative loss. Enhancement might not be the right word, but it was a new technology introduced partway through the 1997 model year (I think).

How to figure out if your truck is AEL

Similar info here
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  #38  
Old 01-15-2019, 03:09 PM
mrbieler mrbieler is online now
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Truck was made in December '96. Original pump is WFX101020, with AEL. Replaced in 2014 with WFX101020K.
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