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carguyjosh, ASE Certified Technician
Category: Chevy
Satisfied Customers: 2172
Experience:  ASE certified , 16 yrs in field
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Chevrolet Impala 2004. 105,000 miles. Hard to start after

Resolved Question:

Chevrolet Impala 2004. 105,000 miles. Hard to start after warming up. Diagnostic tools reading "Bank 1 Running Rich." I have replaces the Oxygen sensor that is on the manifold. It runs great when starting it cold.
Submitted: 7 years ago.
Category: Chevy
Expert:  carguyjosh replied 7 years ago.

Can you tell me which engine you have? The 3.4 or the 3.8?


Thanks Carguyjosh

Customer: replied 7 years ago.
3.8 Engine
Expert:  carguyjosh replied 7 years ago.

The fuel pressure regulators on these engines have had a ton of problems. What is happening is that the regulator fills the vacuum line that connects to it with fuel and on a restart, it has all of that raw fuel being drawn into the engine, thus, flooding the motor...


Pull the vacuum line off of the regulator and see if a fuel leak or fuel is present in the line. If it is, replace the regulator...If it is not, run the engine for awhile, pull the hose of a wait a few minutes to see if the leak occurs.


I had the same problem on 1 3.8 engine that took me 2 days worth of checking to get it to act up...


The fuel pressure regulator is located at the end of the fuel rail next to the throttle body..


Thanks Carguyjosh


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