Jump to content
Ultimate Subaru Message Board

What's wrong? Have to hold throttle wide open to start hot engine?


Recommended Posts

This is on a '90 Legacy. It starts fine when it's cold, but when it's hot you have to hold the throttle tight to the floor to get it to start. It seems to run fine once it starts though. Plus, the check engine light isn't on. I'm guessing maybe something with the MAF sensor? This is my daughter's car, and I'd like to get it straightened out so she isn't stranded somewhere. Thanks.

Link to comment
Share on other sites

Could be many things but your symptoms are in line with a coolant temp sensor malfunction.

The sensor send to the ECU the info that the engine is cold when in fact it is hot. The ECU sends to much gas and floods the engine (too rich a mixture).

That's why you can start with the pedal to the floor : you give the engine more air and that leans the mixture.

A possibility to investigate.

The fact that there's no CEL is strange though. When that happened to me (same symptoms) the CEL had been on for quite a while.

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.

 Share

×
×
  • Create New...