Best Answer

i have a 2000 Ford Expedition, min did the same thing....twice. first time had a bad O2 sensor replaced that ran fine. second time was plugs Would help to know make and model of vehicle. But the most likely cause is an engine miss due to a bad plug wire or plug or a dead cylinder [no compression]. Other causes could be a vacuum leak or the fuel/air mixture may be way off. The engine is still missing at higher speeds you just don't notice it as the higher engine speed simply covers it up. This is why engine misses are usually diagnosed only at idle or under load while the vehicle is stationary. bestalucktoyou Check passenger side motor mount. A bad one will make the car vibrate at idle. The car very much may be out of time. At higher engine speeds you will not notice it. If you recently had the timing belt done or your timing belt jumped, would cause this. But first try a tune up.

User Avatar

Wiki User

โˆ™ 2009-05-31 17:25:59
This answer is:
User Avatar

Add your answer:

Earn +5 pts
Q: Why would an engine shake while idling like it is out of time but smooth out once you start driving?
Write your answer...

Related Questions

Can spark plugs cause car to shake?

Yes, when idling and driving.

Why would your car shake when you are idling and have the AC on but not when you are driving?

spark plug gap Can also be a vacuum leak.

Why does Engine shake when idling check engine light flashes?

The engine is not hitting on all cylinders or the distributor (electronic or manual) needs adjustment.

What would cause your car to shake when idling reversing and driving?

Sounds like a misfire caused by electric supply to plugs.

Why does your engine shake while driving?

Maybe its your motor mounts.

Why would a car vibrate or shake sometimes while idling and whle driving 65-70mph?

Loose motor mounts.

What causes the engine to shake when idling or stopped?

A miss or A collapsed engine mount or A imbalance caused by a failing component, harmonic balancers and torque converters are common.

Why does a 2004 s60r Volvo randomly shake when driving?

Maybe engine misfire.

Can bad muffler cause car to shake when idling?

A clogged muffler can.

What would cause an engine to shake at idle and while driving?

It might be a broken motor mount or transmission mount.

Why does my Toyota echo engine shake?

Because even when its just idling, there are 100 small explosions every second inside of it with a powerful heavy metal crankshaft rotating 1500 times per minute. You could have a bad engine mount.

Why does 99 Lexus GS300 motor shake while idling and eventually turns off?

The "check engine" light should be illuminated. Start with investigating the code(s). They may lead you to the cause.

1996 camaro starts to shake in idling when engine is hot and will stop after high rpm?

check your timing and motor mounts and make sure all cylinders are igniting when needed these will most likely be the answer to your problems!

Why would your engine shake vibrate some days and not others?

check your motor mounts if not than it might not be your motor but the pavment your driving on.

Why might a 1997 Mazda Protege shake while idling?

need to replace the intake manifold gasket

Why does my car shake when idling at a red light?

There are a few reasons why a car shakes when idling at a red light. Some reasons could be the ignition coil, motor mounts, or spark plug problems.

What is the Spark plug gap for 1998 Chevy Metro 1 Liter 3 cylinder?

.039 to .045-----i preffered .041 it seemed to make the engine shake less. but its hard to get them to run nice and smooth. your engine might be different , i did several gap ranges . .041 worked for me, ran fairly smooth.

What is causing my car to shake very roughly all the time upon startup idle and driving?

It could be a bad motor mount or mounts. Motor mounts have rubber in them and go between the engine and the frame. Over time the rubber gets brittle and wears out, causing the engine to shake.

Why does your 2002 ford escort shake very badly when you are idling?

Need new motor mounts..... That's what was wrong with mine.

Does a bad alternator make your car shake when idling?

It could if the battery was so weak as to not be providing enough voltage to run the engine. But if that were the case you could not rev the engine without it missing badly. Drive to your nearest auto parts store and they will be happy to check your charging system free of charge.

What causes shake on a Saab 93 convertible?

if while driving you need wheel alignment an/or wheel balancing. if it s just while idling it can be a few things like worn motor mounts clogged fuel injectors causing low or ramping rpms

Can the rim or tire cause the car to shake or vibrate?

Yes, either can cause a shake while driving.

What would make a 1999 ford contour shake or vibrate while idling but run smooth on the highway?

I wish someone would post an answer to this one as my 1996 4 cyl Contour has this problem aslo. It paases smog with room to spare but has the idle problem. Also I wsh postings would give more info such as: what engine -4 or 6 cyl & be more specific as it makes a huge difference on getting an answer

Why does a 2001 Honda crv shake when idling and smell like sulfur?

Bad catalytic convertor. Egg smell is a dead giveaway.

What causes the steering wheel to shake back and forth when car is idling?

Your power steering pump and or steering box may be about to give out on you.