Question about 1995 Buick Park Avenue

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1995 Buick Park Ave. stays in limp mode will not go into closed loop. I suspect ECM is bad, is there an easy check for this problem? I have checked all connections and grounds, any help would be appreciated.

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These might help you out.............! having tranny problems out nowhere one day it would slip and not fully engage into gear until about 40 mph. after several weeks and a fluid filter and lucas trannyfix additive it still slipped . as a last result Idecided to check for blown fuses before a trip to the tranny shop.a 10a fuse feeding the transmissioncoolant fan was blown I believe that feeds the fan on the passenger side of the radiator, any way i replaced the 10a fuse the car worked like normal again I was later told that the computer will put certain parts of the car into a limp mode to stop catastrophic damage from say a overheated tranny. unfortunately most people will run to a repair shopfirst and get charged 1300.00 dollars for a 10a fuse ....you know it has happened more than we want to know!

Posted on Nov 10, 2010

  • Bayyagg
    Bayyagg Nov 10, 2010

    Limp mode detects overheating of transmission fluid!

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what about spark plugs , Have you checked them whether are not burnt. ( if is petrol engine ).

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The code indicates the TPS is still bad and the code is usually right, but it could be a wiring issue at the TPS connector or less likely a computer issue.
To test the TPS circuit, you need to check voltage and ground from the ECM - 5v is the normal reading between the ECM reference circuit and the ECM ground circuit at the TPS connector. Checking the TPS signal circuit to the ECM requires monitoring the TPS signal on a scan tool while jumping the 5v reference and the signal circuits. The TPS reading should go from high when the circuit is jumpered to low when the jumper is removed.

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Make sure the battery cables are clean and tight on the battery. Check to see if the wires to the starter are tight. Try starting it in neutral to make sure the safety switch is being make. Also hold it up into park and try.

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1 Answer

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WHEN ENGINE GOES CLOSED LOOP TO OPEN LOOP.YOU HAVE A RICH FUEL MIXTURE.YOU HAVE A VACUUM LEAK.BY YOU HAVING ROUGH IDLING.AND A HIGH MILEAGE ENGINE I WOULD DO A COMPRESSION TEST OR CYLINDER LEAK DOWN. CHECK FOR LEAKING VALVES AND LOW COMPRESSION .THEY BOTH WILL CAUSE ENGINE TO IDLE ROUGH CAUSE MISFIRE.CAUSE OPEN LOOP CONTAMINATE HO2 SENSOR CAUSE A RICH FUEL MIXTURE.

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