1998 LS400 with a JDM 1UZ VVTi swapped in - temp and fuel gauge issue(?)
#1
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1998 LS400 with a JDM 1UZ VVTi swapped in - temp and fuel gauge issue(?)
I purchased a 1998 LS400 with a "bad motor" with the hopes that it was a timing belt issue (didn't know VVTi 1UZs were interference at the time). When the car arrived I had my mechanic look at it and eventually it became clear that the engine was done (dropped a valve). So I ordered a "JDM" 1UZ VVTi off eBay and swapped it in.
The car runs great, only issue (aside from some valvetrain noise ) is that the temp and fuel gauges are a little off. When at "normal" temps, the gauge will sit at 2 o'clock and no, it's not overheating. At first I thought maybe the ohm scaling between the USDM and JDM CLT sensor was the culprit, causing the ECU to see a "higher" temp than normal but after running out of gas at just below 1/2 tank (yes, I ignored the low fuel light) I realized something else was up.
When I fill up, the fuel needle wont budge for 150-160 miles, my "E" is basically at 3/8ths of a tank... I initially hoped a fill-up would maybe reset the float but I wasn't so lucky.
Anyone experienced anything like this?
The car runs great, only issue (aside from some valvetrain noise ) is that the temp and fuel gauges are a little off. When at "normal" temps, the gauge will sit at 2 o'clock and no, it's not overheating. At first I thought maybe the ohm scaling between the USDM and JDM CLT sensor was the culprit, causing the ECU to see a "higher" temp than normal but after running out of gas at just below 1/2 tank (yes, I ignored the low fuel light) I realized something else was up.
When I fill up, the fuel needle wont budge for 150-160 miles, my "E" is basically at 3/8ths of a tank... I initially hoped a fill-up would maybe reset the float but I wasn't so lucky.
Anyone experienced anything like this?
#4
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I'm inclined to agree with you on the fuel gauge, seeing as to how swapping motors should have zero effect on pump/sender/etc...
#7
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Alright, bumping in hopes of some new insight...
That's what my temp looks like once warmed up. Car isn't hot, all fans function as they should, that's just where the needle sits. My fuel gauge is about an 1/8th away from bone dry.
@TaninAuto I will box this mother****er up tomorrow if you say you've seen this issue before and can fix it.
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#8
We repair gauge issues at least 1-2 times a week on 98-00 LS400.
From the looks of it your RPM is going bad too, it's reading low.
Probably need a minimum of fuel / temp replacement.
From the looks of it your RPM is going bad too, it's reading low.
Probably need a minimum of fuel / temp replacement.
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TANIN AUTO ELECTRONIX
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TANIN AUTO ELECTRONIX
262-456-4147
contact@taninauto.com
www.taninautoelectronix.com
#10
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Called my local Lexus dealer and ordered the two gauges for $118/$155 (cost + 10%) and am going to give this repair a shot.
#12
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Don't get me wrong, I'm not trying to take anything away from their service, they were very helpful and responsive while I was inquiring with them about the job but I kinda like to "DIY" so here I am.
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