Q: Rough idle after sensor and rear seal changed

asked by on December 20, 2016

Engine sensor fault code. Sensor changed.Fault cleared.Engine started and ran for 1 day and went into limp mode. Car towed into dealership to have rear main seal and sender wheel replaced.car starts but has rough idle.cam sensor tested ok. Dealer says seal was installed correctly but i suspect the TDC was not set to cylinder 1.what are the symptoms of TDC being set 180degrees off?Dealer is now wanting to change ECU that appears to be working fine and exhibited no issue prior to these changes?

My car has 70000 miles.
My car has an automatic transmission.

Hi there. Sounds like the dealership technician may have removed some vacuum lines to get to the rear main seal and may have not put them back on. Check the back of the engine to see if any vacuum lines are disconnected. When installing a crankshaft position sensor, the computer will automatically adjust the timing. Another thing is check the transmission bell housing area for the vibrations. It is possible that the bolts to the torque converter could be loose or replaced if they were lost or broken. If you need further assistance with your engine vibrating after the rear main seal is replaced, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?
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

What does the Security System Alarm indicator mean on the dash?

If your car is equipped with a security system, you’ll see a light on the dash that flashes periodically. All this means is that the alarm has been set. If the light isn’t flashing, it means the alarm is not...

What does the Service Engine Soon Light mean on the dash?

The Service Engine Soon Light is tied into your car’s Emissions system, which includes a broad range of sensors and components in the engine, your Fuel system, and the Emissions system. When you first crank the car, the Service...

Coolant leak fogging up window

Hi. It sounds like your heater core has failed. Hot coolant flows through the heater core and the heat is moved into the passenger compartment by the blower motor. The heater core is located under the dash which is why...

Related articles

The Top 5 Selling Cars in Alabama in 2012
2012 2012 was a great year in Alabama for auto manufacturing, but that wasn’t the only bright spot. Vehicle sales in Alabama were also robust in 2012. Nothing much changed in terms of the vehicle types that were most popular...
How Long Does an EGR Vacuum Modulator Last?
Not Not only does the EGR (exhaust gas recirculation) system in your vehicle cut down on emissions, but it also helps to make your engine run more efficiently. However, in order for this to be true, every single component in...
How to Buy a Good Quality Exhaust Manifold
The The exhaust manifold bolts to the cylinder head of the engine and pulls exhaust gases from the individual ports; combining them into one outlet to flow back into the remainder of the exhaust system. Exhaust fumes are sneaky, and...