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Thread: 1990 Galant GSX cut off at 4,000 RPM'S

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  1. #1
    90gsx
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    1990 Galant GSX cut off at 4,000 RPM'S

    My car has an eratic idle and when I go down the road the rpm's get to about 4,000 and the car bogs down and wont go past it. But if I hit the gas really hard it will go all the way up no problem (not in gear). sometimes I can get it to go past while driving but most of the time i cant. I have a 90 GSX and the guy that i bought it from told me that it needed an o2 sensor and the car would run great. Since then i replaced the o2 sensor, fuel filter (under the hood), the spark plugs, the idle air controll module, and the thermo valve and a lot of vac hoses, and also the air filter. I had the car checked out and i was told that the fuel pressure is normal (measured from the fuel filter under the hood.) and the car still has the same problem. I have no clue what the problem is and no money for trial and error. Please help...

  2. #2
    I will get myself a Data logger if I were you. You will need it in the long run + it's really useful. Ask somebody that knows how to use it if you dont but I would really wanna try to learn it.
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  3. #3
    either the timing belt is off, or the ECM has a leaking capacitor, requiring repair or replacement.

  4. #4
    90gsx
    Guest

    bad computer

    Thank you, i pulled out the computer and found out that it is infact bad.
    Much appreicated though...

  5. #5
    You are here entirely tooo much!! seth98esT's Avatar
    Join Date
    08-01-2002
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    Keokuk, IA
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    8,348
    Yah pretty much the same thing was hapenning to my 90 Talon. It took me forever to figure it out. But as soon as I opened up the ECU I could see leaking capacitors actually corroading the board. Crazy stuff.
    7g for life!

  6. #6
    You are here entirely tooo much!! 4-G-rim's Avatar
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    07-20-2003
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    Probably a good opportunity to modify the ECU if you have a good amount of solid mods.

    1991 Galant VR4 1948/2000_________1996 Galant "S" 5 speed 2.4L turbo

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