Question: My Town and Country is showing a misfire in cylinders one and four. It runs rough at idle, backfires under load or acceleration, surges when trying to hold at RPM and park. Answer: There could be several reasons for a misfire. Your misfire is located on the 1 and 4 cylinders; this can make it easier to locate the fault.
Check out this other post. It runs good a few weeks and then I have problems again with symptoms of stalling and low power. The only code that comes up is the MAP sensor. Any ideas why my sensor keeps failing? Or what else should I look at? Answer: The problem might be in the connector or circuit for the MAP sensor. You may need the repair manual for your model to identify wires.
Check the vacuum hose as well. These other posts may help too:. Question: Is there a reset button you need to do when putting in a new MAP sensor on a Ford Fusion set to shut off the check engine light? Answer: On some models, it's possible to disconnect the battery to turn off the check engine light. But I believe you need to erase the code in order to reset the light using a scanner.
Otherwise, it'll keep coming back, even if you disconnect the battery. Try Autozone first. If not, stop by a local shop. They'll charge you though. Hope this helps. Question: I have a dodge dart gt, it turns off sometimes running and there comes a time where it does not start. Twice he has turned on the code p and replaced the part of the throttle system and continues with the same fault? Answer: Probably the idle air control IAC motor is getting stuck, allowing too much air to into the system.
Make sure the throttle plate is not getting stuck either. This other post may help here:. Question: I have Suzuki XL7 It was fine but at a certain point the engine light came on. My problem is that when I drive, it downshifts while stopping at a traffic light or sometimes delayed shifting response from lower gears while accelerating or sometimes even random shifting between gears.
For example, it sticks in gear 4 and when I try to downshift from that gear, it goes to gear 2. It skips gear 3. Answer: Usually, delay in shifting is caused by the clutch for those specific gears.
However, other problems can also lead to this issue, like a leaking hydraulic circuit or a sticking spool valve in the valve body. Also, you may want to try checking the vacuum. If it fluctuates or has incorrect pressure, there could be your problem. This other post may help:. Answer: It depends on your particular model, but look at a location, usually, in the upper area of the engine compartment: near the strut tower, intake manifold, throttle body, even near the headlight assembly.
Sometimes you need to remove the air cleaner assembly to gain access to it. The auto parts person at your local area may be able to tell you the location in your particular model.
Question: I have a Grand Cherokee Limited 4. Which is miraculous as it goes days with dying times a day or go days without dying. Can you show me or tell me what to do!!?
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These are engines that use high pressure to pump gasoline which then vaporizes it. What the MAP sensor does is it assists the engine in figuring out what it needs to have the best combustion possible. This is done by calculating how much air is entering the engine, the number of rotations in the engine per minute, and the temperature of the air. Once this is all figured out, the electronic control unit of the engine calculates the air density within the fuel mixture.
Based on this calculation, the electronic control unit will regulate the flow of fuel and the flow of air accordingly so that the best combustion possible can be performed. The MAP sensor should remain functional for a very long time. However, the time will eventually come when the MAP sensor does malfunction because of damage or wear. Once that happens, there will be one or more recognizable symptoms that will pop up and catch you by surprise.
Then you could be left with even bigger problems that will cost more money to fix. Here are five of the most common symptoms of a bad MAP sensor which you can easily recognize. With a bad MAP sensor, you will be consuming a lot more gasoline than you normally do. Although there are many reasons that result in poor fuel economy , consider one reason to be a bad MAP sensor. If too much fuel is being injected into the cylinders, then it will cause more hydrocarbons to be released through the tailpipe and go into the environment.
Many states require car owners to get emissions testing every 1 to 2 years. If your vehicle fails the emissions test, then have a mechanic look at your vehicle to see if the MAP sensor is to blame.
A bad MAP sensor can cause a lot of strange symptoms. While worse fuel economy is one of those symptoms, sometimes better fuel economy is a symptom too. However, you will experience a much weaker engine in the process. If a low amount of pressure in the intake manifold is wrongfully detected, the PCM will treat this as a smaller load for the engine. This will cause the engine to be injected with less fuel which results in slower acceleration than usual.
A bad MAP sensor will cause an improper amount of fuel and air to be mixed together in the combustion chamber.
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