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I was driving then all of a sudden my RPM's

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  • Cars & Trucks Master
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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 or ECM,ECU), 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 Nov 08, 2012

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MR.PUTT,HAVE YOU HEARD ANY NOISE OR SOUND WHILST HAVING ZERO REVS? SINCE YOU DO NOT HAVE AND CRANK START SINCE THEN MY ADVISE DO NOT FORCE THE ENGINE AS THERE IS A POSSIBILITY IF YOUR ENGINE IS WITH TIMING BELT , THE BELT SNAPPED . BETTER TO CALL YOUR MECHANIC TO CHECK IT.

Posted on Nov 08, 2012

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

08TurbotC
  • 18 Answers

SOURCE: Engine Cuts out at 3500 RPM

Sounds like you need to replace the MAF sensor its the unit on toyota vehicles that calulates how much Air intake is going into the throttle body and then sends a signal to the ECU of your car which adjusts your Fuel injector compensation. When your MAF Sensor is malfunctioning it will throw the fuel curves out of wack and cause your car to what mechanics call "lean out" or "running rich" its basically your getting too little or too much fuel at higher RPM's and the motor is choking from too much fuel and not enough air. Hope this helps let me know if it doesnt so i can continue to troubleshoot for you via internet

Posted on Jul 21, 2008

  • 1 Answer

SOURCE: Hyundai Veracruz 2007 Sudden engine

OK, folks, here's the scoop. The dealer took our Veracruz in for diagnostic testing and determined the cause of the problem was the actuator for the Electronic Transmission Control system (ETC).

Apparently, in later model cars like the Veracruz, a computer controls the transmission as well as the engine for optimum performance.

If the computer detects a severe enough fault in one of the components of the ETC (e.g. bad sensor, bad component, etc), it places the vehicle in limp home mode.

Based on my experiences, when in limp home mode, the transmission is forced to stay in 3rd gear, the engine will not exceed 2000RPM, the accelerator is not responsive past 2000RPM, and the engine runs rough (probably because the mixture is changed to very rich). The philosophy here, as was explained to me by somebody who works for Hyundai, is to allow the vehicle to continue operating long enough so that it can be driven to a safe location or for service.

I asked whether or not this limp home "feature" could be disabled at the dealership, but apparently it cannot.

I have alerted some folks at Hyundai Motor USA to this thread so they can do further research if the problem begins to affect more individuals than just us three.

FYI - I am in no way shape or form a mechanic or mechanically-minded, so if I have explained anything correctly, I will gladly accept further corrections/explanations from an expert or mechanic. :)

Posted on Aug 25, 2008

tommyboinow
  • 324 Answers

SOURCE: Hard to start warm engine

Sounds like you have a problem with your fuel injectors, either they are working to much or not enough once they get warm....

Take it to a shop ant tell them you want the injectors tested.

Posted on Nov 26, 2008

  • 255 Answers

SOURCE: 1999 Dodge Ram 1500 - Cranks fine, idles good, but

check ignition timming

Posted on Aug 14, 2009

  • 400 Answers

SOURCE: When i stop at a redlight my RPM drop to 0 and it cuts off

Try and clean out you throttle body with carb cleaner. The IAC passage and throttle blade gets carbon built up on them and when the truck is trying to make it idle the blade sticks and stalls out.

Posted on Oct 13, 2009

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