clacey Posted February 7, 2004 Share Posted February 7, 2004 I have had, what I thought was a "cold start" issue with my 91 LS400. I've tested many of those components and all is well. I now believe it is a fuel issue. Here is the deal: The time it takes to crank seems to be related to the amount of time the car has been sitting. Example: If the car sets overnight, it takes about 3-4 secs to start in the morning. If the car sets several days, it might take 6 secs to start the next time. Once you start it, for the first time in the morning, you can immediatly kill the engine and it will start immediately all subsequent times. It seems as though the fuel system, very slowly looses pressure over time, as the car sits. There is no gas visibly leaking under the car. The only other thing I noticed is that the evap canister is rusting and it smell like gas. I'm not sure if that could have anything to do with it. Anyone have a clue? I don't think the injectors are leaking. Is this something I can test? Does the fuel system stay pressurized when the engine is off? Thanks, CL Quote Link to comment Share on other sites More sharing options...
90LS400Lexus Posted February 7, 2004 Share Posted February 7, 2004 Perhaps a weak fuel pump or clogged fuel filters? Quote Link to comment Share on other sites More sharing options...
VMF Posted February 7, 2004 Share Posted February 7, 2004 i changed fuel filters and it didnt help in my case:) it is still takes around 1.5-2 secs to start mine:) Quote Link to comment Share on other sites More sharing options...
jzz30 Posted February 7, 2004 Share Posted February 7, 2004 i think thats normal. Quote Link to comment Share on other sites More sharing options...
clacey Posted February 9, 2004 Author Share Posted February 9, 2004 I checked my injectors yesterday and they were not leaking. I wonder if it could be the fuel pressure regulator. CL Quote Link to comment Share on other sites More sharing options...
UCF3 Posted February 9, 2004 Share Posted February 9, 2004 Has anybody changed their starter, alternator, and fuel pump. I know mine is getting old and it takes 1.5sec to start my LS on a cold day. During summer it's immediate. On the other hand, my SC takes close to 3secs and does that, even during summer. Quote Link to comment Share on other sites More sharing options...
clacey Posted February 9, 2004 Author Share Posted February 9, 2004 You might trya good throttle body cleaning. Mine has 213,000 mi and everything was really gunked up, including the cold start injector. CL Quote Link to comment Share on other sites More sharing options...
MICKEYLEXUS Posted February 9, 2004 Share Posted February 9, 2004 I have had, what I thought was a "cold start" issue with my 91 LS400. I've tested many of those components and all is well.I now believe it is a fuel issue. Here is the deal: The time it takes to crank seems to be related to the amount of time the car has been sitting. Example: If the car sets overnight, it takes about 3-4 secs to start in the morning. If the car sets several days, it might take 6 secs to start the next time. Once you start it, for the first time in the morning, you can immediatly kill the engine and it will start immediately all subsequent times. It seems as though the fuel system, very slowly looses pressure over time, as the car sits. There is no gas visibly leaking under the car. The only other thing I noticed is that the evap canister is rusting and it smell like gas. I'm not sure if that could have anything to do with it. Anyone have a clue? I don't think the injectors are leaking. Is this something I can test? Does the fuel system stay pressurized when the engine is off? Thanks, CL just a test :D Quote Link to comment Share on other sites More sharing options...
91ls400 Posted February 10, 2004 Share Posted February 10, 2004 Where is the throttle body? How do you remove and clean it? Quote Link to comment Share on other sites More sharing options...
clacey Posted February 11, 2004 Author Share Posted February 11, 2004 The throttle body is the top part or layer of the engine. It proudly displays the Lexus badge. The air filter element connect into it. I bought some Carb and choke cleaner and some shop rags. I chose to remove mine. It takes about an hour. There is a post on here somewhere that shows how to clean it without removing it. I only removed mine to check the cold start injector which is in the bottom of the intake assembly. CL Quote Link to comment Share on other sites More sharing options...
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