My car wouldnt start and misfired so because it said misfire on cylinder 4 Ive changed sparked plugs,spark wires,ignition coils,icm,ecm,replaced engine,crankshaft sensor,harmonic balancer now it still doesnt wanna start and when it does it doesn't stay running and dies and overheats what should i do?
My car has an automatic transmission.
Hi there. If your car had overheating issues before this misfiring issue began, it is quite possible that you have some internal engine damage like a blown head gasket that is the primary source of your troubles. Other damage to cam sensors and ignition timing and fuel components can also cause these issues. Before you sink another dollar in attempting repairs, I would strongly recommend having a professional mobile mechanic from our team come to your location and complete a car is hard to start inspection so they can pinpoint the root source and recommend the best course of action.
How to Identify and Fix Common car Problems ?
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Hello – to answer your location question, the ECM is behind the fuse and relay block of electronics under the passenger side of the dash (behind the glove box).
Engine Cranks But Won`t Start
There are a variety of possible causes for a no start, but one of the most common with the 3800 engine is a bad crankshaft position (CKP) sensor or a bad ignition control module (ICM). The crank sensor contains two hall effect sensors that sends two signals to the engine computer.
3 coils is all that is required on these vehicles because of the coil and spark plug wire set-up.
One of the symptoms indicating that your ECM is not working properly is engine stalling or misfiring. Sometimes, this sign doesn`t show that there`s something wrong with the engine but that there`s a malfunction in the engine control unit. The chances are that the engine stalling won`t be consistent.
Bad Sensors
One common culprit for this problem is the crankshaft position sensor, which measures the position and speed of the crankshaft. The computer uses the information from this sensor to know when to fire the spark plugs. If the sensor isn`t working, the spark plugs won`t fire, keeping the engine from starting.
Problem Description. If the engine cranks but does not start, or starts and stalls, the fuses should be inspected, especially the power door locks fuse. The power door lock fuse provides power to a module that sends the Powertrain Control Module (PCM) the “OK to start” signal.
No reset. You can reset adaptions but that isn`t necessary.
A clogged or failed exhaust gas recirculation or crankcase ventilation valve or faulty oxygen sensor can send the wrong signals to the computer and cause misfires.
After you`ve changed your spark plugs, you should start up your engine to make sure they`re working as they should. If your engine starts up without a hitch, you can pat yourself on the back for a job done right.
Four-Wire Coils
Three of the wires are power, chassis ground and PCM command signal, just like the previously mentioned three-wire coil. The fourth wire is a diagnostic circuit known as “IGF” and is run in parallel with all of the ignition coils. The PCM provides a 5-volt bias voltage on this circuit.
Typical output voltages for modern ignition coils vary from 15 kV (for a lawnmower engine) to 40 kV (for a larger engine).
A faulty ECM can send poor data to your vehicle`s transmission control module (TCM). As a result, the vehicle cannot properly shift gears or apply power, causing the shift to feel awkward, delayed, or even jarring. When this occurs, the engine may sporadically become more active or stall out.
For example, poor performance or unexplained drops in fuel economy or efficiency are often related to onboard car computer problems, or faulty ECU issues. A damaged ECU can cause problems when shifting gears in an automatic transmission, or cause sudden jerking or stopping that`s similar to transmission problems.
The most common source of ECM failure is in one of the wiring harnesses. If the wires to the transmission or fuel injectors become corroded, they can lose conductivity, leading to a failure. Fortunately, these issues can usually be resolved by replacing the corroded wires.
You can use a bench test setup, which simulates the car`s electrical system and sensors, to connect your ECU and check its operation. You can also use a software tool, such as an ECU simulator or a diagnostic scanner, to communicate with your ECU and monitor its parameters, codes, and outputs.
An engine control unit (ECU), also commonly called an engine control module (ECM) is a type of electronic control unit that controls a series of actuators. The ECU is typically found in the engine compartment, but it also can be located inside the passenger compartment.
Car suddenly stalls while operating: One of the most common symptoms of a failed ignition relay is a car that suddenly stalls while operating. If the ignition relay shorts, burns out, or otherwise fails while the engine is operating it will cut off power to the fuel pump and ignition system.
A difficult start could be due to a number of things, from a dying battery to a faulty starter. But if your vehicle has a hard time starting after sitting for just a few hours, it can cause an extra layer of confusion. When this happens, one of the most common causes is low fuel pressure.
A faulty ECM can send poor data to your vehicle`s transmission control module (TCM). As a result, the vehicle cannot properly shift gears or apply power, causing the shift to feel awkward, delayed, or even jarring. When this occurs, the engine may sporadically become more active or stall out.
Starting a vehicle with a bad crankshaft sensor can be risky and it`s unlikely to work. Disconnect the damaged sensor and try spraying a little starter fluid in the throttle body on your engine. Then, try cranking the engine to start the vehicle.
An engine control unit (ECU), also commonly called an engine control module (ECM) is a type of electronic control unit that controls a series of actuators. The ECU is typically found in the engine compartment, but it also can be located inside the passenger compartment.
