Question about 2004 Volkswagen Jetta

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Timing belt seems to be skipping or dragging causing car to drive very rough and causing the Idle to go real high or slow

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The only problem you will get from the timing belt is a heavy bill when it snaps.try looking at the mass air sensor.....

Posted on May 27, 2010

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Posted on Jan 02, 2017

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2000 ford escort 2.0L. plugs, wires, coil pack, alternator, MAF sensor. hard to start and RPM around 1k wants to die (any stops) always runs rough. Says air intake sensor. catalytic converter or CCRM?


Have you cleaned the throttle body and throttle body valve? have you cleaned the idle speed control air bypass valve? are the injectors clean? Are there any fault codes in memory, do the things I mentioned if you haven't already. Also hard engine mounts can cause roughness at idle. Another thing is the timing belt tight?

Jan 27, 2017 | Ford Escort Cars & Trucks

1 Answer

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

2007 jeep liberty has been checked at auto zone for check engine light on showing fuel regulator code needs replacing. Started driving rough and idle rough


autozoned, the AUTO store, not a real shop.?
if yes, why would you ever ask any clerk this.???
if they knew this , they'd have a high paying job !
I can tell he lied to you, if it was a clerk.
but you never posted the DTC codes, why skip the most important facts? scan it , report all DTC stored, or its all a waste of time.

if not a clerk, the real and truthful mech would have said
we do more tests to find the bad part, it can be many.
Ill not guess and waste your time . and $$$$
we dont guess we tests and find true cause. unless rich and guessing is your only path, due to (in too much hurry).

the engine is a V6, no engine stated,
and the fuel rail on many V6 has this FPR,
but on newer cars it moved to inside the gas tank.
im not looking yours up, just on a clerks ,wild guess.
we check fuel presssure with tools, not guessing.
see, its a 3 mode test. too.

Aug 01, 2016 | Jeep Cars & Trucks

1 Answer

I added fuel additive to my fuel had timing chain done 2 days ago now It won't idle it dies and runs real rough at high RPM's. If you put it into drive gear kills motor.


Sounds like a spark plug or wire issue. Anytime the vehicle starts to skip, die, or (run rough) its usually these minor things. However if that does not help, start looking into your fuel system. Always try cheapest first. Plugs and Wires....Good luck...

Jun 07, 2013 | Cars & Trucks

1 Answer

Changed water pump & timing belt last night. Car ran fine at idle and test drive. Wife went on errands this morning and after the last stop. Car would not re-start. Could the timing belt skip a tooth...


Just a thought that the belt could slip if the tensioner did not locate properly. Seems too coincidental that it is not related to the timing belt.

Jan 15, 2013 | 2000 Mitsubishi Montero Sport

1 Answer

1983 s10 blazer low rough idle and trys to die when starting have to give it a little gas and put it into drive real quick then when slowing down keep foot on gas pedal as i also slow down with break pedal


Could be several things, a vac leak, dirty throttle body, or faulty idle air control valve.
The computer controls idle speed by how much air enters the throttle body thru the valve.
Usually a vac leak would speed up the engine unless it is causing the rough idle.

Jan 10, 2013 | Cars & Trucks

1 Answer

Please tell me what is causing my toyota wish to shut off when i slow down and try to stop


This all depends if it runs good and not rough or skipping then i would say to check the idle control valve. this valve is what controls the idle and if it goes bad then it will cause engine to idle high or low and make it stall at stops. this is what i would start looking at first, you can try to remove and clean this valve and see if that helps but if not then replacing it may be needed. good luck.

Mar 18, 2011 | Toyota Corolla Cars & Trucks

2 Answers

Someone once told me a damaged power steering pump can cause a car to idle lower than normal due to the fact that it runs off the engine belt, and can cause a vehicle to have rough running issues. But I...


hmmm.. no true experiance with this but if the PS pump is turning hard do to damage, it could drag the engine down. depending on the condition of the other pullies in the system (crank, alternator, A/C etc) it could cause the belt to slip on the crank pully which might cause other pullies to turn slow.. but that would be really odd. Usually it is not the crank pully that slips....

What else is going on?

Mar 07, 2010 | 2008 Ford Fusion

2 Answers

Engine falls below 500rpm lights dim and engine stalls out


I had a bad air conditioner compressor that caused this same problem. It had almost completley seized and gave the car some real trouble starting. The burning smell I had was caused from the belt rubbing around the seized pully.

Jan 08, 2009 | 1997 Pontiac Grand Prix

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