Q: 06 Ford 500

asked by on

Car shakes when idling and shuts off as soon as I hit the gas pedal. Everything else works fine. I have tried to see if it would throw a code, but absolutely no luck there.

My car has 155000 miles.
My car has an automatic transmission.

The engine should be scoped to evaluate the secondary firing patterns. That will provide an important clue. Apart from mechanical possibilities such as a blocked exhaust and/or loss of compression, what you are describing is due to an ignition, fuel system, or air induction fault. There are lots of possibilities and so what you have will simply have to be diagnosed. Just as a for instance (but, again, there are many possibilities), when the engine is cold, the engine coolant temperature sensor must be working properly to signal the PCM to enrich the mixture on cold start. If there is a fault with that sensor, you can experience rough idle idle as you are describing. Other possibilities are a vacuum leak, an air induction fault like a stuck idle air control valve, problems with the mass air flow sensor, defective spark plugs and possibly a weak coil(s). If you desire that this problem be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a rough idle diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: While I was driving I all of a sudden couldn't accelerate no more and my brakes locked up. 1991 Nissan Pathfinder

Hello Typically when this occurs it is due to the brake fluid being contaminated or from a failure in the brake master cylinder. Most of the time when something other than brake fluid is put in the system the seals...

Q: my van had wiring and the computer replaces bc it ran rough. 4 months later same thing. Now suggested to replace the expansion val

The expansion valve has nothing to do with a rough running condition. I'm curious as to what the reasoning was for having the expansion valve replaced. If it is because of an suspected A/C leak then the leak is most...

Q: What should I do to maintain the child restraints and seat belts?

While your child restraints and seat belts shouldn’t need much in the way of maintenance, it is important that you know how to care for them properly. After all, the safety of your family hinges on them. Here’s what you...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.