Question about 1992 Cadillac DeVille

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I exprience not a miss but seems like a problem with fuel injection periodically at take off I have 88000 miles

I had it tunned please help sometimes it bucks like a horse on take off but may smooth out

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  • Cadillac Master
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Its going to be tough to diagnose if you can't duplicate the problem on demand.
If the throttle position sensor is failing, it won't tell the computer the throttle has opened and the injectors need more on time.
But again you won't know if that is the problem unless the problem is happening during the test.

Posted on Jul 10, 2012

  • e cyrus Oct 26, 2012

    I replaced the injector sensor but now the accelerator sticks

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  • Cadillac Master
  • 84,966 Answers

The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.


Posted on Oct 26, 2012

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Posted on Jan 02, 2017

duane_wong
  • 6826 Answers

SOURCE: My Eldorado has 173000 miles, well maintained,

Could be a bad computer not supplying right fuel injector pulses. This happened to my 1990 cadillac deville at about 35 mph, it would buck and miss.
Also, I would flush the coolant system and install new coolant.

Posted on Jun 30, 2010

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