Question about 1997 Hyundai Elantra

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I have problem with 1997 Lantra - runs rough and adjusting idle does not solve problem. When pulling power supply to each injector off - the no.1 and no. 2 cylinder keeps running the engine. No.3 and no.4 engine shuts down. ???? If you can give me some idea of what problem is and how to fix that would be appreciated. Ray.

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Run compressing test ,bad spark plugs, burnt valves,ect

Posted on May 10, 2010

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2000 hyundai lantra sportswagon running rough, idling rough also, when accelerating splutters/spurges. Thinking maybe spark plugs or timing belt??


Needs a tune up. Adjust engine timing, replace plugs and plug wires, replace air filter, oil and oil filter, fuel filter and clean fuel injectors, adjust valves.

Jun 13, 2017 | Hyundai Cars & Trucks

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Rough idle in drive, correct rpm


Car idle is rough Inspection Service & Cost A rough idling engine can be caused by a number of issues, some of them are serious while others tend to be minor, but the symptoms remain pretty much the same. The car will feel rough and bouncy when the engine is running. The car will also idle below its regular speed, display inconsistent RPMs and may produce a shaking, skipping or slipping sound when the vehicle is running.
While a rough idling engine may seem to be a simple inconvenience it often indicates a deeper problem within the engine. The vehicle should be inspected and repaired as soon as possible because small problems have a way of turning into expensive repairs. How this system works: The idle speed of an engine is basically the rotational speed the engine runs on when it is un-coupled from the drivetrain and the throttle pedal is not being depressed. The idle speed is measured in the revolutions per minute of the crankshaft.
When an engine is running at idle speed it generates enough power to smoothly operate equipment such as the water pump, alternator, and power steering but not enough power to move the vehicle itself. A passenger car will usually idle between 600 RPMs and 1000 RPMs. A properly functioning idle should run smoothly without skipping or slipping. Common reasons for this to happen:
  • Dirty Fuel Injectors: The fuel injection system injects fuel into the cylinders, which creates a mix of air, and fuel to ignite and burn. Fuel injectors have tiny nozzles to spray the fuel into the cylinder and they can become clogged over time. clogged or failing fuel injector creates a lack of fuel in the vehicle's engine. This can cause a rough idle, it can also cause symptoms such as slow acceleration or the car not feeling as if it has enough power. If the problem is addressed early, it is possible to clean the injectors, which will restore them to full function. If this condition is not addressed in a timely manner the injectors will need to be replaced. Incorrect Idle Speed: While the average idle speed falls between 600 to 1,000 RPMs, if your vehicle is experiencing a rough idle it could be due to an incorrect idle speed setting. A trained mechanic can easily adjust the idle speed, and it should stay at the proper speed. If an adjusted idle speed becomes inconsistent or changes at random intervals there may be a bigger problem that needs to be explored. Vacuum Leak: If the vacuum system has a leak, it can seriously affect the ability of the vehicle's computer to regulate the air to fuel ratio. This can lead to a rough idle and if the problem is not addressed the car may experience slow acceleration and a lack of power. Vacuum leaks should be inspected and repaired immediately. Incorrectly Installed or Damaged Plugs: Spark plugs are responsible for creating the spark that allows the vehicle to burn fuel. If spark plugs are improperly installed or malfunctioning, the idle speed can be affected. The vehicle's engine may vibrate or there may be slipping or straining sounds coming from the engine. Defective or Clogged Fuel Pump: A rough idle can be related to fuel delivery issues. The fuel pump, which is responsible for pulling fuel from the gas tank to the fuel injectors, can become clogged or defective. If this happens the engine will not get enough fuel, which can cause a rough idle, sputtering, stalling and even slow acceleration. Clogged Fuel Filter: A clogged fuel filter can cause similar problems. The job of the fuel filter is to screen out contaminants in the fuel, over time it will become clogged and need to be replaced. A rough idle is one symptom of a clogged fuel filter. Failing Electrical Components: A problem or failure in the ignition system or various electronic components can cause a rough idle. If this is the case, the problem will usually get worse as RPMs increase. Common culprits include the ignition control module, plug wires, coils, and spark plugs. Defective Airflow Sensor: A defective airflow sensor can be responsible for a rough idle. A mass airflow sensor detects the amount of air coming into the fuel injection system and sends that information to the vehicle's computer. The computer uses that data to deliver the proper amount of fuel to the air in the vehicle. Over time these sensors can malfunction or become dirty. One of the first symptoms of a malfunctioning airflow sensor is a rough idle. The car may also accelerate slowly and even stutter or stall as the problem progresses. Dirty Oxygen Sensor: Oxygen sensors measure how rich or lean the gases are as they exit the combustion chamber. Depending on the results, the amount of fuel entering the engine is adjusted by the vehicle computer. The ultimate goal is to maintain an ideal mixture that produces the lowest emissions. A dirty or failing oxygen sensor will usually trigger the check engine light and can lead to a rough idle, lower fuel efficiency and failed emission test.

Sep 28, 2016 | AC Cars & Trucks

1 Answer

I have a 1997 SAAB 2.0 Turbo and it has started to run rough after it warms up and when driving it loses power and runs very rough until power taken off. Any ideas?


suspect low fuel pressure to the injectors
run the fault codes to determine where the fault may be before you spend money

Oct 09, 2015 | 1997 Saab 900

1 Answer

What would cause 1997 cavailer idle rough with no power ?


these use a timing chain and gears. it may need a tune-up, have a plugged fuel filter, air filter plugging up or coming apart, dirty injectors or fuel supply system, a failing fuel pump, a bad egr valve stuck open completely or partly.

Aug 22, 2014 | 1997 Chevrolet Cavalier

1 Answer

1997 dodge dakota running really rough


So many options...oxygen sensor, egr valve, pcv valve, premium gas.

Dec 01, 2013 | 1997 Dodge Dakota

1 Answer

I have a 97 dodge caravan 2.4L dohc. I started with an engine code of p0303 and p0304. The vehicle has a rough idle and has difficulty accelerating from idle to 35mph. I've run several tests; 1, pulled all...


DTC P0303: Cylinder 3 Misfire Detected
Probable cause:
  1. Control unit software needs updating
  2. PCM or ECM faulty
  3. Fuel injector(s) faulty
  4. Ignition system - Ignition module, coil, spark plugs and wires
  5. Fuel system

Mar 13, 2017 | 1997 Dodge Caravan

1 Answer

Really rough engine idle at cold start up,, reving the engine seems to smooth it out,,,,


Some causes about rought idle could be:
- Valve adjustment
- Incorrect ignition timing,
- Vacuum leaks
- Bad ignition wires (Test w/ ohmmeter)
- Incorrect idle speed
- Cold Start Injector always "ON" (Revised injector time switch avail.)

A source of rough idle in EFI engines is air leaks or vacum leaks these leaks will upset the fuel mixture without triggering any codes. A bad oxigen sensor will also cause a rough idle, but you should see a code for it ( I think is number 5, but check it).

A good place to start would be an inspection of the spark plugs, plug wires, ignition timing, and idle speed. Next would be valve adjustment. Don't overlook the simple things.

Hope this helps, keep us updated and just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

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Nov 04, 2011 | 1997 Honda Accord

1 Answer

I have a 1997 Mitsubishi Galant with rough idle and no power when accelerating. Replaced spark plugs, distributor cap, rotor, spark plug wires, MAF, both oxygen sensors, air filter and the engine still...


I am having the same issue on Mitsubishi Galant 02. Clattering on acceleration, herky jerky idle. Pulled a code multiple cylinder misfire. My mechanic's diagnosis is bad valve cover gasket causing oil to seap into the spark plugs and bad timing belt, which I have not replaced at 150k miles. I do however know my fuel injectors do need cleaning, he hasn't ruled that out either. Have you pulled any code on it? I have read on engine knock sensor going out on some of these also. Hope this helps some.

Oct 20, 2010 | 1997 Mitsubishi Galant

1 Answer

Self-adjusting idle brain often idles 1500-2000rpm range.


Faulty oxygen sensor or low fuel pressure can also cause these codes to be set. I'd go for a fuel pressure test when acting up if at all possible just to confirm I have pressure needed. Have heard of coil problems as well. Should be a good blue 1" min. spark from coil.

Apr 10, 2009 | 1997 Ford Thunderbird LX

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