I did replace the heater core and two sensor the crank sensor and camshaft sensor it didn’t work can it be the computer
I replaced the heater core and two sensor the camshaft sensor and the crank sensor still all its doing is cranking could it be the computer because the guy didn't unplug battery need help
My car has 102584 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
If the check engine light is on, what kind of codes is the system detecting? Do you have spark at the plugs? If you have spark, does spritzing some starter fluid give you a momentary startup? If so, there is a fuel issue. More symptoms and information on the car’s behavior before and after the parts you replaced would be very helpful. At this point, I would recommend an inspection from YourMechanic.com to diagnose this car starting problem, get an accurate assessment of damage and cost estimate for repairs. YourMechanic.com can dispatch a mobile, professional mechanic to your location to help you get your car up and working again.
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
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.
The most common reasons a Volkswagen Passat heater isn`t working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
The crankshaft position sensor monitors the position and speed of the crankshaft and other parameters that play an important role when starting the engine. If the crankshaft position sensor is having a problem, the vehicle may have intermittent starting issues or not start at all.
The most common reasons a Volkswagen Passat won`t start are a dead battery, an alternator problem, or failed starter.
Lack of heat: If the system is not producing any heat, it could be due to a failed heater core. One of the most common signs is a lack of heat coming from the heater. If you turn on the system and don`t feel any warmth, it`s possible that the heater core is not functioning properly.
If you think the cause for your car heating not working is related to the blower fuse, be sure to replace it with one of the same amperage. The fuse may have blown due to age, or it may suggest an underlying problem. If the replacement fuse (of the same amperage) does not blow, you may well have identified the problem.
Bad Sensors
Sensors that fail to send information to the computer may cause the engine to run less efficiently, and they can sometimes be the cause of an engine that won`t start. One common culprit for this problem is the crankshaft position sensor, which measures the position and speed of the crankshaft.
Hard start symptoms and starter failure may NOT be caused by the starter, but could actually be caused by the crankshaft position sensor. If your vehicle is experiencing one or more of these symptoms, the crankshaft sensor may be at fault.
Can you drive without a crankshaft sensor? No. Driving without a functional crankshaft sensor is dangerous and can cause severe engine damage. If the crankshaft sensor in your car fails, you should repair or replace it quickly as possible.
Can you drive without a crankshaft sensor? No. Driving without a functional crankshaft sensor is dangerous and can cause severe engine damage. If the crankshaft sensor in your car fails, you should repair or replace it quickly as possible.
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.
Engine misfires – If the crankshaft position sensor is not functioning properly, it can cause the engine to misfire. This can be due to an incorrect signal being sent to the computer, or no signal at all. Rough idling – Another symptom of a faulty crankshaft position sensor is rough idling.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
I did replace the heater core and two sensor the crank sensor and camshaft sensor it didn’t work can it be the computer
ANSWER : If the check engine light is on, what kind of codes is the system detecting? Do you have spark at the plugs? If you have spark, does spritzing some starter fluid give you a momentary startup? If so, there is a fuel issue. More symptoms and information on the car’s behavior before and after the parts you replaced would be very helpful. At this point, I would recommend an inspection from YourMechanic.com to diagnose this car starting problem, get an accurate assessment of damage and cost estimate for repairs. YourMechanic.com can dispatch a mobile, professional mechanic to your location to help you get your car up and working again.
Just replaced head gasket, changed crack sensor new plugs. The check engine light is on, but dim, the only other light that the dash is a normal battery indicator. The fuel pump is not running when switch is turned on, the power windows don’t work, it turns over but not firing. It’s like only one part of the system is working. Also the heater fans work even if the switch is off.
ANSWER : I would first look at the diagnostic trouble codes. Those codes are available because the check engine light is on. If the fuel pump is not running (momentarily) at key on, that fault alone will prevent the car from starting as there will be no fuel pressure. Pump output and pressure can be directly tested and you can also check for electrical power to the pump. To find out why the engine will not run, the recommended diagnostic is a no start diagnostic. If you request that service, the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.
check engine light code said replace cam sensor will not crank with new sensor but wiil crank with old sensor
ANSWER : Hi there:
That is a very off symptom you’re describing. Without being there to phyisicaly inspect your Nissan, the only thing I’d guess that might be causing this is if the cam sensor you installed was the incorrect one, or perhaps the electrical harness created an electrical fault; causing the ignition relay to not send a signal to the starter relay. You might want to have a professional mobile mechanic complete a car is hard to start inspection; so they can determine why you’re having this issue.
Check engine light is on, shows cam sensor that I already replaced two times. Still the same code for camshaft sensor. It starts if I unplug cam sensor
ANSWER : Hello there, thanks for writing in. I’d be happy to help.
If you replaced the sensor twice and the issue persists, then I would look at the connector and ECM as possible sources of the issue. I would carefully inspect the connector to the cam sensor for any signs of oil leakage, damage, or wear, both on the wires and on the metal contacts. If the wiring looks okay I would move on to testing the wiring to make sure that the correct signal is being generated, if it is not then it may be possible that there is an issue with the ECM or wiring. It may also be possible that the aftermarket sensors are the source of the issue, even if they are new. In many cases aftermarket components are not as high of quality as OEM components, and for that reason can cause issues.
If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make any repairs as needed.
Bad camshaft position sensor?
ANSWER : Hi there. You might find reading this article very helpful in trying to diagnose your P0016 OBD-II trouble code issue. It explains common causes, symptoms and solutions.
I have a p0171 code on my ford ranger 2.5 and have replaced fuel filter maf sensor, iac sensor, fixed vacuum leaks, replaced fuel
ANSWER : Hello there. You might to read this article about the P0171 OBD-II trouble code; as it will give you ideas on causes and possible solutions.
The camshaft position sensor works one day and then doesn’t work on other days. Should I just replace it?
ANSWER : As you may know, the camshaft position sensor is a magnetic sensor that monitors camshaft speed to regulate ignition timing and fuel injection timing. It gathers and sends information about the car’s camshaft speed (and as a result the position of each piston) to the car’s electronic control module. This information is received by the computer, which then uses this data to further calculate the time of ignition and the timing of fuel injection required by the engine. When this is not working properly, you may experience a drop in power, poor idling, poor fuel mileage, and problems starting the vehicle.
As the sensor begins to fail and gets worse over time, the signal it provides to the computer weakens as well. I would recommend having a professional from YourMechanic come to your location to inspect the car and replace the camshaft position if necessary.
So I had two codes come up for two of my o2 sensors..replaced them both and check engine light is still on…my mechanic seems to
ANSWER : Hi there:
Although it’s hard to say if there was serious damage done to your ECM during this service, it’s more likely that the stored error codes were never cleared from the ECM, and that’s why the warning lights still appear. This is a common oversight with some mechanics, but if you have a mobile mechanic complete a check engine light inspection, they should be able to clear those stored codes and determine if further damage has occurred.
