1998 LS400 - Decrease in gas mileage
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Driver School Candidate
Joined: Nov 2004
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From: California
1998 LS400 - Decrease in gas mileage
I had the timing belt, water pump, tensioners etc replaced about 3 months ago. Everything seemed fine, car ran smooth. However, I have lost about 2 miles per gallon. I put in new plugs, new Lexus air cleaner, to no avail. I checked the compression and got 160 plus on all cylinders. I've talked to the mechanic and gotten nothing. I've talked to a couple of Lexus dealer mechanics and not gotten any good suggestions. The timing belt possibly being off by one tooth was mentioned, but the consensus seems to be that this can't happen without exhibiting obvious effects. The car has 140k miles and is driven fairly gently. Pre-timing belt, I typically registered 27 mpg plus (tank average) and now, 25 or less is common. Driving routes and habits are very similar week to week and haven't changed. Gas gets reformulated here in Southern California for summer v. winter, but I've had the car several years and never experienced a major mileage change like this. Needless to say, I'm pretty disappointed with this situation.
Any ideas or help would be very appreciated -- Steve
Orange County, CA -- SSS.Chambers@gmail.com
Any ideas or help would be very appreciated -- Steve
Orange County, CA -- SSS.Chambers@gmail.com
to be honest, a 7.5% decline could easily be due to gas, especially here in fickle CA.
that and the fact that 25mpg total avg (do you drive in the city at ALL??) is pretty damn high for anything other than constant hwy trips.
that and the fact that 25mpg total avg (do you drive in the city at ALL??) is pretty damn high for anything other than constant hwy trips.
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Joined: Apr 2010
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From: florida
Mpg's
My car was worst, change distributor caps and rotors. I'm not sure if that model has them or coils. I'm new here, so might be the problem. My car is a ls400 1990 w/85k miles and 1 dist cap was cracked and a rotor. Check them out.
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Joined: Mar 2010
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From: Florida
https://www.clublexus.com/forums/ls4...read-this.html
tried this? op's issue is exactly like mine pretty much so im gonna change this sensor asap!
tried this? op's issue is exactly like mine pretty much so im gonna change this sensor asap!
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