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1989 Pontiac Lemans Losing Horsepower

Tiny
INEEDLEMANSHELP
  • MEMBER
  • 1989 PONTIAC LEMANS
Engine Performance problem
1989 Pontiac Lemans 4 cyl Two Wheel Drive Automatic 107K miles

I have absolutely no clue as to why. I just lose horsepower randomly. I've noticed that my temperature gauge refuses to rise very much, the one time it moved up a decent amount she drove great. My mechanic has said that it isn't the thermostat.
He's replaced an O2 sensor, a map sensor, and has greased a some module.
Any clues?
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Wednesday, November 19th, 2008 AT 4:44 PM

1 Reply

Tiny
LYOKOFREEZE
  • MEMBER
  • 3 POSTS
Hello there!

I've run into a lot of the same issues. I would check the following:

-Throttle Body
- Make sure it's not clogged
- Run an injector cleaner like Seafoam
- Have the Mechanic rebuild it
- There are other sensors in it to potentially replace
-Vacuum Lines
- I know I've got the same problem right now and we've narrowed it down to a vacuum leak. Have him check ALL lines.

- Question: Are you also having misfire issues also?
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Tuesday, July 14th, 2009 AT 1:26 PM

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