I have changed the camshaft position sensor, crankshaft position sensor, spark plugs and plug wires and there still is no fire.
I have changed the cam and crank sensors. plugs and plug wires. did the timing and still getting no fire. the car started once before but ran rough and didn't get above 3000 rpms. there was a spark close to their speed sensor when trying to start again and have been getting no spark ever since. could the speed sensor be causing my car to get no spark?
My car has a manual transmission.
My car has a manual transmission.
Experienced mechanics share their insights in answering this question :
Hi there. If there was a spark around the speed sensor as the engine was starting, then there is a major short in the ignition system. Check all of the wiring grounds and make sure that they all are hooked up and clean. If you are referring that the coils are sparking on the outside, then the coil has a crack on them and they would need replaced. I recommend seeking out a professional, such as one from Your Mechanic, to help you with your ignition system.
How to Identify and Fix Common car Problems ?
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The most common failure is the crankshaft position sensor. These fail much more frequently than the cam sensor and will cause a no start. It can also occur if the timing belt broke or jumped a tooth. I would do a compression test also to see if there is low compression.
Car Will Not Start: Over time, as the camshaft position sensor fails, the signal it sends to the engine control module weakens. When the engine no longer receives the signal, you will not be able to start your car. Engine Misfires: A failing camshaft position sensor can cause your engine to misfire.
Unfortunately, there`s no way to reset a camshaft position sensor. If you`re having camshaft issues (check engine light on, acceleration trouble, sputtering and stalling, etc.), you`ll have to replace the part entirely.
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.
NOT PERFORMING A RELEARN PROCESS
In rare cases the engine may misfire or go into “reduced power” or “limp mode” especially under high RPM/load situations Additionally, omission of the relearn process could cause the vehicle to be unable to pass an emissions test due to incomplete or failed misfire monitor.
While the new sensor is now installed, and you may get lucky and have it function perfectly right from the start, it`s highly recommended to “relearn” the sensor at this point in order to calibrate the entire system properly.
After you`ve replaced the camshaft sensor, be sure to take your car to a qualified mechanic and ask them to reprogram it using a OBD-II scanner. Doing so will clear any error codes and make sure that the engine computer is getting accurate signals from the new sensor.
your car fails to start: the engine`s computer uses the map sensor to gauge atmospheric pressure before the engine is started. a false reading could cause too much or too little fuel to be delivered to the engine. both conditions could keep it from firing up.
The MAF can become clogged with excessive carbon build-up from the combustion cycle, or sometimes by road grime. If it is too dirty, it will be unable to correctly measure the air fuel ratio, and cause your car to not start or exhibit other unusual symptoms.
Crank sensors can fail due to excessive heat, faulty wiring harnesses, and sensor movement.
What happens if you drive without a crankshaft sensor? Your car`s engine will not function correctly if you do not have a crankshaft sensor.
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.
In a piston engine, either a timing belt (also called a cambelt) or timing chain or set of timing gears is used to synchronize the rotation of the crankshaft and the camshaft.
Autel TS601 TPMS scan tool integrate tire pressure sensor Diagnostics(Check), Activation(Read), Programming, and Relearn in one.
If your crankshaft sensor is not working properly, the motor control unit in your vehicle won`t be able to execute the changes to the fuel injection or to the spark timing whenever the engine speed climbs.
Fortunately (spoiler alert) the root cause of a no-crank is almost always simple. Most of the time it`s simply due to a low or dead battery, or voltage drop through a corroded connection. Rule those out before you suspect the starter itself.
Yes, a failing synchronizer can illuminate the malfunction indicator lamp (MIL), and may cause vehicle stalling, loss of power, hesitation, surging, poor fuel economy, or a no-start condition.
OBD2 Diagnostic Trouble Code P0340 indicates that the Camshaft Position Sensor `A` Circuit Malfunction in Bank 1 has been detected. The camshaft position sensor (CMP sensor) provides information regarding the rotational speed of the camshaft and where the camshaft is positioned in relationship to the crankshaft.
Installing a camshaft is a routine repair that many tuners and mechanics enjoy. It`s less work if you have a hoist, but the lack of a hoist will not prevent you from performing this repair. You can replace the cam with the engine in the car by removing the radiator, grille and brackets to provide access.
They carefully scrutinize each of the given camshaft`s valve timing events and optimize them for the particular engine, application, and specific RPM range, and it is for this reason that the camshaft should be properly degreed as part of the installation process.
You may notice poor engine performance including irregular acceleration, misfiring, hard starting, or surging. On some car models, a failed CMP sensor will prevent the ignition from making a spark, so that the engine won`t start at all.
When the car eventually starts, the engine will rattle, may make a grinding noise or knocking sound, and the check engine light may remain on. Some drivers have complained that their car starts to go into limp mode. The vehicle may stall or stutter and drivers will have trouble accelerating after coming to a stop.
What Are The Signs Of a Failing MAP Sensor? As the MAP sensor fails, it can cause various issues with the fuel system and vehicle performance. An inaccurate reading from the sensor will cause the computer to change the amount of fuel it sends, which can rob the engine of power or cause it to run poorly.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
I have changed the camshaft position sensor, crankshaft position sensor, spark plugs and plug wires and there still is no fire.
ANSWER : Hi there. If there was a spark around the speed sensor as the engine was starting, then there is a major short in the ignition system. Check all of the wiring grounds and make sure that they all are hooked up and clean. If you are referring that the coils are sparking on the outside, then the coil has a crack on them and they would need replaced. I recommend seeking out a professional, such as one from Your Mechanic, to help you with your ignition system.
Spark plug chaos. Rubber stoppers are preventing the spark plugs from coming out.
ANSWER : Hi there. Try using a pair of small needle nose pliers to pull off the rubber boots from the spark plugs. As you pull, twist the rubber boots to break them free. If you cannot get the rubber boots off, then try using some mineral oil on the boots to aid them off, then clean off the oil with soap and water with degreaser. If you need further assistance with removing the boots from the spark plugs, then seek out a professional, such as one from Your Mechanic, to help you.
Engine will not stay started. I have replaced idle control valve map sensor spark plugs spark plug wires no check engine light is
ANSWER : You have a problem with the distributor assembly. I recommend replacing the distributor assembly. This will replace all the possible sensors and coil for the ignition and fix the problem you have.
Car turn over won’t start have new battery starter and altinator and changed spark plug and spark plug wires and crankshaft sensor
ANSWER : Hi there. The first thing I would recommend would be to have a professional mechanic complete a digital scan of your ECU to see if there are any stored error codes that might pinpoint the source of your problem. However, one thing you might want to check yourself is the electrical harness connected to the crankshaft position sensor. In most cases, if this is diagnosed a being damaged, it’s actually the harness that is bad and needs to be replaced.
Spark plugs,spark wires,icm,ecm,ignition coils,replaced engine,crankshaft sensor,harmonic balancer car still misfires, wont start
ANSWER : 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.
crank but no start, has no spark changed crankshaft sensor still no spark my brother shorted out battery fuses still good any idea
ANSWER : You should have a mechanic check the vehicle for you to see if shorting the battery out caused more problems with the system than you think. If the system was shorted out you may have blown a computer module. If so, it would need to be tested for proper operation and the data needs to be assess for it to start again. Since you can’t get the car running, consider YourMechanic, as one of our mobile experts can come to you and diagnose your starting issue firsthand.
Does anyone know the spark plug firing order for a 1992 Ford Ranger 3.0 V6? Changed out my spark plug wires, starts wants to die.
ANSWER : Hi there. Here is some info for you to review. 1991-1994 2.9L and 3.0L Engines Firing Order 1-4-2-5-3-6 – 1995 And Later 3.0L V-6 With DIS Ignition System Firing Order 1-4-2-5-3-6.
CHECK ENGINE LIGHT ON
ANSWER : The on board diagnostic (OBD) sets a pending code each time the ECU detects a problem. It confirms the code if it sees the same problem twice. So you’re really only dealing with the two codes : P0016 and 17.These codes are telling you that the timing between the crankshaft and the camshaft are off on Bank 1 (the driver’s side) cylinder bank. This could be a sensor error, a problem in the reluctor ring on the harmonic balancer, or a timing chain problem. Without doing a thorough diagnosis, it’s impossible to say what parts specifically need to be replaced. If you contact Your Mechanic, they can send a technician to your home or office to investigate the codes on you Mercedes and then let you know what it will take to fix it.
