Q: 04 explorer 4.0 soho po171

asked by on

Bought truck non running,found broken rear timing cassette.I pulled the motor bought the expensive cam alignment set and everything went well changed all the chains and cassettes.put it back in it fired right up but runs quite rough and only code on it is a po171 fuel trim lean on bank 1.Checked for vacuum leaks pulled the intake and valve covers rechecked the timing,all good.Compression on bank 1 is 170,165 and 170.

My car has 101000 miles.
My car has an automatic transmission.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. 04 explorer 4.0 soho po171

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

Q: There are sometimes small vibrations during idle and at times a clacking noise

Hello. The noise you hear is the timing chain and tensioner. This is the most common noise in these motors. The fix is to replace the timing chains and tensioner for both sides of the engine with new guides also....

Q: What do the various MyKey® status messages mean?

While the MyKey® system lets you create keys with specific restrictions (for use by drivers just getting comfortable with responsible driving, for instance), it can be problematic at times. The system can be hard to understand at times, so let’s...

Q: Brake Fluid Leak On Front Driver Side

This may suggest you have a leak coming from your brake master cylinder or the lines running to it. As you may know, when there is a significant loss of brake fluid, you may notice a spongy brake pedal or...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.