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Chevrolet Impala LS: ,I have a 2000 Chevy Impala 3.8

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Hi, I have a 2000 Chevy...
Hi,
I have a 2000 Chevy Impala 3.8 with 79,000 miles on it. I have a problem with rough idle after the car is up to temp. and been shut off and a period of about five minutes pass and the car is restarted. The car will have a rough idle. The upper and lower intake were replaced and the MAF, ICS. I replaced the catalytic converter, fuel pump and filter.
It gives a code P0171. I sprayed carb cleaner around and can not find a vacuum leak. Please help.
Submitted: 3 years ago.Category: Chevy
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Customer reply replied 3 years ago
I also tuned it up with new wires and plugs. I replaced the egr tube that goes from the Intake to the Egr valve. I was getting a vacuum leak from the tube.
Answered in 1 hour by:
6/25/2015
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 3 years ago
AMEDEE
AMEDEE, CHEVY TECHNICIAN
Category: Chevy
Satisfied Customers: 28,338
Experience: ASE certified tech ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
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Hello and welcome! My name isCustomerand I can assist you with your question.
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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 3 years ago
Have you checked the fuel pressure regulator for leaks?
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Customer reply replied 3 years ago
Yes no leak.
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 3 years ago
Ok and have you had the intake system smoked check for leaks?
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Customer reply replied 3 years ago
No. I sprayed carb cleaner all over the engine and and the vacuum lines
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 3 years ago
Ok, getting the intake checked for leaks using a smoke machine is your next step. This is a much better way to check for vacuum leaks rather than using carb cleaner (and safer)
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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 3 years ago
You can also check the fuel trims using a scanner that can read live data.
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Customer reply replied 3 years ago
I will get that checked. Thanks
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 3 years ago
In addition, dont forget to check the PCV valve and system
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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 3 years ago
Your welcome! Also, dont forget to check the MAP sensor as well. Have a great day!!
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Customer reply replied 3 years ago
I replaced the PV valve and spring and o rings. The fuels trims look good until it is restarted after warm up.
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 3 years ago
If the fuel trims are high at idle, this indicates a vacuum leak.. because engine vacuum is at its highest point at idle.
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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 3 years ago
Hello!
It'sCustomerfrom just answer. I am just checking in to see how things are going and to see if you need any further assistance?
Let me know!
Customer
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Customer reply replied 3 years ago
I am taking it to a shop to have it smoke tested on Monday.
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 3 years ago
Sounds good! Keep in mind, you can always rate my answer now and we can still continue this conversation at no further cost to you.Customer
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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 3 years ago
Hello!
It'sCustomerfrom just answer. I am just checking in to see how things are going and to see if you need any further assistance?
Let me know!
Customer
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