Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

spfi acts like carb w/bad accelerator pump


  • Please log in to reply
5 replies to this topic

#1 MilesFox

MilesFox

    Catch this Fox!

  • Members
  • 10,456 posts
  • Madison/Milwaukee, WI

Posted 22 November 2003 - 09:07 PM

jims 88 spfi 4wd 5spd d/r wagon acts like a carb with a bad accelerator pump. when you rev it up, it makes somewhat of a "popping" noise, and has no torque. just like a vacuum leak, but it idles normally. once you get enough momentum, it drives fine, as long as you ease into the gas. if you put her down at rpm, it will stumble.

i read once on the board about a solenoid that will stick open, something to do with air introduction.

it has almost 200,000 miles. we have that little $100 for a spare, if that may be it. but could it be something on the throttle body? the amount of "vacuum leak" seems more than what that little component will allow.

and also, could it be the brake booster. you can tell it works when the motor runs, and when you step on the brake while idling, it will make popping noise or want to stall out.

#2 86subaru

86subaru

    Elite Master of the Subaru

  • Members
  • 3,094 posts
  • ohio

Posted 22 November 2003 - 09:32 PM

also the car sat for 6 months without a hood , and aleast another 6 months just sitting . ::clap:

#3 MilesFox

MilesFox

    Catch this Fox!

  • Members
  • 10,456 posts
  • Madison/Milwaukee, WI

Posted 22 November 2003 - 11:58 PM

bumpity bumpity:banana: :banghead: :wave:

#4 86subaru

86subaru

    Elite Master of the Subaru

  • Members
  • 3,094 posts
  • ohio

Posted 23 November 2003 - 07:28 AM

bump ,any help ? thanks

#5 TomRhere

TomRhere

    Certified BRAT nut!!!

  • Members
  • 3,971 posts
  • Hillsdale, Mi. USA

Posted 23 November 2003 - 08:00 AM

Don't know much about FI systems, myself, but sounds like it's running lean.
Sitting with no hood on it, could've cause some corrosion on the wiring connectors, giving false signals to the ECU.
Could be the coolant temp sensor is bad, or faulty. ECU has to know the temp of the engine to give proper pulse timing to the injector(s).
Would a bad O2 sensor cause a lean condition? Where as the O2 sensor is telling the ECU that the engine is running rich, causing it to lean-out the engine.

Lean air/fuel mixture will cause backfires thru the intake, so can improper ignition timing.

Have you checked for vacuum leaks, everywhere?

#6 86subaru

86subaru

    Elite Master of the Subaru

  • Members
  • 3,094 posts
  • ohio

Posted 23 November 2003 - 09:05 AM

no we have not , may change the 02 censor ,thanks




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users