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running rough

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How Long Does a Timing Chain Last?
A timing chain is a metal chain, as opposed to the timing belt which is made of rubber. The chain is located inside of the engine and needs to be lubricated by...

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Question
Cranks and runs rough have to keep foot in gas to keep running. Has new fuel pump and died while driving after pump was changed
Check fuel pressure. There are only three possible explanations: a fault in fuel supply (plugged filter, injectors, etc.); ignition system problems; and air induction including the idle air control valve, throttle position sensor, mass air flow sensor and vacuum leaks...
Question
Car engine makes hissing sound when driving and bogs down when idling. 2004 Nissan Maxima
Hi there - you are on the right track. If the hiss comes more directly from the engine (with the hood up for example), you probably have an air leak in the intake tract of the engine. If the hissing...
Question
car losing power and dieing with stuggle to restart
Common causes of engine stalling and rough idle include a faulty mass airflow sensor, faulty engine coolant temperature switch/sensor (typically at cold start only), worn spark plugs, wires or defective ignition coil(s), inadequate fuel delivery or pressure (clogged fuel filter,...
Question
Car shaking when we stop at lite feels like its going to die.
Hello, and thank you for writing in. The vehicle can have idling problems when there is an issue with fuel or exhaust issues. You can have the fuel pressure tested at the engine to see how much fuel is being...
Question
Ongoing engine/exhaust problem Volkswagon Polo
Hi there - to be helpful from a diagnostic point of view, having the problem codes set by the engine would be very helpful. Many other components can fail, causing the rough running symptoms you still experience: stuck exhaust gas...
Question
rough idle when stop
I would recommend using a portable scope to look at the secondary firing patterns which will enable you to narrow down the issue to fuel versus an ignition fault. The problem you are describing could be due to a faulty...
Question
Issue
With the description that you have provided, it sounds like there is most likely a misfire condition. When you say that diagnostics have been run and they say that the spark plugs need to be replaced, I'm unsure on exactly...
Question
I have misfires in cylinder 7, replace spark plugs, trucks idles rough. 1997 Chevrolet Tahoe
Hello - check first for problem codes, whether your Check Engine light is on or not. Most auto parts stores will do this for free on a "time-available" basis. If the misfire is still ignition-related, check plug wires, especially the...
Question
Truck runs fine til warm. Have replaced distributor cap, plugs, wires, rotor button, tps, coolant temp sensor, idle air c 1997 Chevrolet Sierra 4.3 L
Hi - there your symptoms suggest the truck runs too lean when it gets hot. (I am taking the position that there are no problem codes and your Check Engine is not illuminated - if so pay attention to those...
Question
My car is running a bit rough after jumping it off what can I do to fix it? 1998 Pontiac Bonneville
Hello - your symptoms suggest multiple possible problems from higher-mileage classic like your Bonneville. It's possible that your engine has "jumped time", meaning that the timing gears and chain are sufficiently worn that the the timing chain jumped a tooth...
Question
2009 Subaru Forester Runs Rough
There are numerous potential causes for your concern. Your vehicle has electronic throttle control, as you mentioned. In this system, a stepper motor integrated into the throttle body is used to control throttle position. The main inputs for throttle control...
Question
Hi, i recently had my belta 2012 service but now its starting poorly and it acts like its catching n idles by 0.5 n then struggles
Hello, thank you for writing in. You need to take into consideration what was done during the service. If they made a mistake during the repair, then we need to know what was done so we can verify the repair...
Question
My car idles rough at stop lights.
There are a couple of things that may cause this situation. A clogged engine air filter or dirty throttle body may not allow the proper amount of air to flow while the engine is idling and cause a low, rough...
Question
Vehicle is running rough.
If the vehicle starts to act up at operating temp, you may have an issue with the idle air control valve. These will typically get gummed up and some vehicles may have a hard time starting when cold or act...
Question
Started idling rough then stalling at traffic lights after about 20 minutes of driving. Replaced fuel pump, fuel filter, and spark plugs.
Try flushing out the fuel system with a fuel treatment. You may have to remove the supply fuel line and blow out the line with air pressure to clean out what could be blocking the line. Check all of the...
Question
Hello. I have a 2001 Ford escape XLT 3.0. It has been sitting for almost 4 years with the thought of having a blown head gasket.
Check the crankshaft position sensor and see if its not working properly or if the harness is broken. If the sensor is working fine, then check the ignition coils and see if there is an voltage to the primary circuit....
Question
My sl600 V12 has 161,000 miles. Do I need to replace the ignition wires?
If you suspect that the engine is misfiring, you should identify and resolve the cause now because misfiring can cause lots of collateral damage such as plugging up the catalytic converter. Misfiring also wastes lots of gas, has the potential...
Question
have a 98' Honda Civic Dx with manual transmission that's got some sort of issue. Most of the time it runs just fine, but randoml
Hello, thank you for writing in. Although the parts you have replaced are the key components, you are going to be more worried about the air intake, throttle, and idle air control valves. The idle air control valve keeps the...
Question
Is it bad to drive a car that needs a valve adjustment?
Hi there. If the valvetrain is out of adjustment or the lifters are stuck and making a tapping noise on the top of the engine, then that could damage the engine when driven. I recommend changing the engine oil and...
Question
Rough in morning. 0 compression. after heats up runs okay to 100 compression. in 3 cylinders only on a Miata 2004.
Your engine has morning sickness. There is no way for the engine to have a 0 compression as the engine would not start, so there has to be at least 60 pounds of compression to ignite the fuel. The issue...

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