Jump to content


Ls400 Help


Jerjer

Recommended Posts

Hey guys well Im new to your site and I need your help with my 91 ls400

My car is giving codes 25-26 and is running rich and fowling the plugs and mising really bad.

It runs better when cold the codes are rich and lean fuel condition Im not worried about the lean just the rich.

I have cheched the wires and coils and they are good I really dont want to geuss and throw parts at it

Any advice would help

Link to comment
Share on other sites

Hi and welcome to the LOC.

Your symptoms seem to suggest the problem is temperature related.

If the car seems OK when cold but not when warm it would point to the coolant temperature sensor.

When cold the fuel mixture is richened (used to be the choke on older cars) as the engine warms up the mixture is weakened to normal fueling levels. If the engine ECU, because of a faulty coolant sensor,thinks the engine hasn't warmed up it will continue over fueling and giving the problems you have.

You can check the sensor with a multimeter,either the voltage output hot and cold or it's resistance hot and cold, for what they cost just replace it but also check the wiring connections to it as well.

Link to comment
Share on other sites

Well problem solved and I cant believe what fixed it

Since it was do for a tune up I replaced the plugs and wires and its fixed

I never would have thought thats all it was, while I was at it Cleaned the throttle body and intake and installed a k&n filter and wow this thing hauls !Removed! way better then before

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.



×
×
  • Create New...

Forums


News


Membership


  • Unread Content
  • Members Gallery