'94 Lexus LS400

lost1

NAXJA Forum User
Location
Yuma, AZ
My LS has been acting a little strange lately. Seems like once things started heating up down here (we're talking Yuma folks, I see 110-120F for nearly a month straight every day at the high point of summer.) my engine started surging and hesitating, what I would expect form either dirty fuel injectors or a dying fuel pump. ran fuel injector cleaner, did the seafoam treatment, etc. Nada. I notice it all the time now though, and when the tank gets low it's much worse. (I try to keep it halfway full at all times but sometimes you just can't.) When I bought the car, the prev owner said he had just replaced the fuel pump, and since the float sensor appears to be jacked up (goes to half-tank when full and generally sits at E after 100-125 miles.) I believed him.

Shortly after I got this car, my (then) girlfriend decided a car that needs premium would do just fine on Unleaded. other than that moment of brilliance, its always had at least 91 octane, if not higher.

I have had some minor trouble with the main seal (it wants to leak once I get the car warmed up) but otherwise this car has been bulletproof. Before I go tearing into my trunk, is there anything else I should be checking?

for those wondering why I'm posting about a luxury car in a jeep forum, I think the average IQ here is a littel higher than most of the forums dedicated to these cars.

Those people are either sending thier cars in to get worked on by mechanics, or kids who stumbled on a cheap car and are ricing the heck out of it. Very few truly knowledgable people in the forums I can access at work.
 
OK, an update. In hopes that it wasn't what I thought it was, I disconnected the battery to reset everything; lo and behold, the problem is *almost* non-existent! Looks like it might be something in my intake, a sensor somewhere.

I just don't know where to start looking or how to test the individual parts.
 
Back
Top