2000 monte carlo poor idle - Engine Troubleshooting


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2000 monte carlo poor idle

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rentalguy88
New User

Mar 30, 2013, 1:43 PM

Post #1 of 5 (1831 views)

2000 monte carlo poor idle	Sign In

an issue i got on my 2000 Monte Carlo LS. After about 10-15 mins she will idle erratically then stall.give her a couple minutes she will do the same thing. after a few tries she will throw code P0171. i had the intake and cylinder head gaskets replaced in january at the local garage. i replaced the fuel filter last fall. i replaced the PCV valve last week. I cleaned the throttle body and took off the maf sensor of my 97 malibu cleaned it and installed it on the Monte. I tried her and the same thing. repleced ignition coil module and coil still same thing.replaced automatic idle control sensor and throttle position sensor.still same thing.Should i have disconnected the battery for the car's computer to reset or do you think its a vacuum issue.

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Mar 30, 2013, 1:51 PM

Post #2 of 5 (1822 views)

Re: 2000 monte carlo poor idle	Sign In

What is the fuel pressure while it is stalling out?

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

rentalguy88
New User

Mar 30, 2013, 1:55 PM

Post #3 of 5 (1815 views)

Re: 2000 monte carlo poor idle	Sign In

got no gauge to see pressure can it be bad spark plugs?

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Mar 30, 2013, 1:57 PM

Post #4 of 5 (1810 views)

Re: 2000 monte carlo poor idle	Sign In

Not sure. If I had to guess where to start, it would be monitoring the fuel pressure while all this is going on. If it is setting a lean code, that could indicate low fuel pressure. A test gauge would confirm that.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

rentalguy88
New User

Mar 30, 2013, 2:00 PM

Post #5 of 5 (1788 views)

Re: 2000 monte carlo poor idle	Sign In

i guess i'll put her in garage on monday to get fuel pressure test and see what happens from there.
thanks for your time

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