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Old August 29th, 2010, 10:41 pm   #1
OwlWolf
  
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Default Performance Problems

I currently own an 1993 Ford Probe Gt. I purchased it about 4 months ago. It is a manual transmission, 2.5 liter V6. Gradually, the acceleration on the Probe has deteriorated to the point where it is nearly undrivable. A school bus could beat me from a dead stop.
I have:
  • Tested Fuel Pressure (It is ideal)
  • Changed Fuel Filter
  • Cleaned Air Filter
  • Changed Distributor
  • Set Timing
  • Replaced Spark Plugs
  • Checked Vacuum Systems (Again, ideal)
  • Verified Catalytic Converter not plugged
  • Run Performance Enhancing Cleaners Through Fuel Systems and Oil

Notes
  • I have a steady, but small valve cover oil leak
  • Intermittent number 1 cylinder knock
  • Catalytic converter is only reading 450 degrees F when under normal operating conditions
  • The intake has been modified to a K&N one (was there when I purchased it)

Important:I disconnected the throttle position sensor to force it into open loop mode, and the performance was much better (probably can defeat that school bus now). Other than that, I don't know where to go.

I would greatly appreciate some ideas for a route to take. Thanks in advance for any comments
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Old August 30th, 2010, 3:39 am   #2
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you check your compression yet? might be bad rings or headgasket
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Old August 30th, 2010, 3:45 am   #3
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does it sound like your running on 3 cylinders? on my 93 gt i had a problem
with the top fuel rail not getting any fuel because of a bad wire. check the
2 connectors for fuel rails... i would be driving with absolutley no power with
my foot on the floor trying to move and all of a sudden my car would regain
6 cylinder and it took of like a plane. so check the 2 connectors.

hope ya find the problem
next time put the thread in second gen probes
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Old August 31st, 2010, 2:50 am   #4
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Hey, I really appreciate the suggestions. And I am sorry about posting in the wrong thread, I noticed after I posted it :/

But I will check it out, it doesn't seem like I am only running on three. I unplugged each wire individually and I felt a bog from them, so at least at idle they are all working.

And how would I do a test for compression? I currently have not.

Last edited by OwlWolf; August 31st, 2010 at 2:58 am.
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Old August 31st, 2010, 2:58 am   #5
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If the car runs bettwr with the tps unplugged, doesn't that indicate you have a bad tps?
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Old August 31st, 2010, 3:12 pm   #6
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^^That is what I said on PT..
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Old September 5th, 2010, 7:48 pm   #7
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I finally had the time to check some things, and I found that the TPS is functioning as far as I can tell. I followed the calibration tutorial and it still ran awfully. Whenever the TPS is disconnected, the car runs in open loop mode and runs without following the sensors' information. So it doesn't necessarily mean it is the TPS, just that I have a sensor that is giving bad information. Oh, and I am not getting a check engine light while the car is running.
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Old September 6th, 2010, 8:11 pm   #8
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Quote:
Originally Posted by OwlWolf View Post
I currently own an 1993 Ford Probe Gt. I purchased it about 4 months ago. It is a manual transmission, 2.5 liter V6. Gradually, the acceleration on the Probe has deteriorated to the point where it is nearly undrivable. A school bus could beat me from a dead stop.
I have:
  • Tested Fuel Pressure (It is ideal)
  • Changed Fuel Filter
  • Cleaned Air Filter
  • Changed Distributor
  • Set Timing
  • Replaced Spark Plugs
  • Checked Vacuum Systems (Again, ideal)
  • Verified Catalytic Converter not plugged
  • Run Performance Enhancing Cleaners Through Fuel Systems and Oil

Notes
  • I have a steady, but small valve cover oil leak
  • Intermittent number 1 cylinder knock
  • Catalytic converter is only reading 450 degrees F when under normal operating conditions
  • The intake has been modified to a K&N one (was there when I purchased it)

Important:I disconnected the throttle position sensor to force it into open loop mode, and the performance was much better (probably can defeat that school bus now). Other than that, I don't know where to go.

I would greatly appreciate some ideas for a route to take. Thanks in advance for any comments

do you have any dtc's?
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Old September 14th, 2010, 10:32 pm   #9
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After running around trying to find a solution, Advanced Auto employees helped me to diagnose the problem. They told me that my catalytic converter sounded bad, but it wasn't reading high temperatures because the flex pipe before it was letting out all the backpressure with a hole it had. After spending time replacing the two of those, it runs like a dream! Thanks for all the helpful posts
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Old October 1st, 2010, 4:04 am   #10
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wierd....
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