Do Not Sell My Personal Information Jump to content

Possible Fuel Issue. Need Some Advise


clacey
 Share

Recommended Posts

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

Link to comment
Share on other sites


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.

Link to comment
Share on other sites

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

Link to comment
Share on other sites

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

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
×
  • Create New...

Forums


News


Membership