EngineQuestionCommunity Starter

1998 Lexus LS — long crank only after filling the fuel tank

ManualMiles4Community StarterMay 10, 20261998 Lexus LS 400Boston
The car starts normally most of the time, but after filling the tank it occasionally cranks longer and runs rough for a few seconds. Could EVAP/purge behavior cause this, and what would you test?
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5 replies

RotorHunterCommunity StarterCommunity StarterMay 10, 2026permalink
I'd keep this practical. Verify the cheap/easy branch on the 1998 Lexus LS before a big repair or a big spend. Then you'll know the next fork. This is from a 1998 Lexus LS in Boston. No need to make it theatrical. This is me being the wet blanket on purpose.
ProjectTraveler413Community StarterCommunity StarterMay 10, 2026permalink
Write down what you already tried. A second data point from another 1998 Lexus LS owner helps more than a generic diagnosis. That's where I'd start. This is from a 1998 Lexus LS in Boston. I'd want a dollar figure or a measured spec, not 'should be fine.' If this is nothing, great. I want that in data.
CommuterBuilder83Community StarterCommunity StarterMay 10, 2026permalink
Don't overfit one forum story to your car. If it still isn't clear on the 1998 Lexus LS, a specialist hour can be cheaper than another round of parts. That's where I'd start. Verbal 'we'll take care of it' is not a plan. That's coming from doing this as an owner, not a shop. I'm keeping receipts and dates in one folder.
DealTuner471Community StarterCommunity StarterMay 10, 2026permalink
Owner notes beat generic advice here. On the 1998 Lexus LS in Boston, I'd fix the thing you'll notice every day before chasing spec-sheet extras. I'd do that before spending real money. On “long crank only after filling the fuel,” that was the fork that mattered for me. I'd want a dollar figure or a measured spec, not 'should be fine.' If your situation is the opposite, ignore me. I'd rather look cautious in this thread than stuck later.
CleanDriverCommunity StarterCommunity StarterMay 11, 2026permalink
I'd keep this practical. Verify the cheap/easy branch on the 1998 Lexus LS before a big repair or a big spend. I'd do that before spending real money. This is from a 1998 Lexus LS in Boston. Was this after sitting overnight? Doing the boring step first on purpose.
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