Rough idle in gear only/warm engine

10

Asked by RGriff61 Dec 03, 2020 at 04:06 PM about the 2007 Chevrolet Monte Carlo LT FWD

Question type: Maintenance & Repair

I have a 07 Monte Carlo 6cyl. It idles rough in gear
only/warm engine. New plugs, wires installed,
routine maintenance regularly, etc. No hesitation
just rough idle. Any suggestions???

6 Answers
26,810

oilyspill answered 3 years ago

See the p0506, I don't know if low idle speed is your problem? You can see the system description. you can clean the throttle bore and around throttle plate, don't force the throttle plate. How many miles on your engine? You have good cylinder compression? With transmission in park or neutral, not much load on engine, higher rpms. With transmission in gear, there is a load on engine, rpms lower. Any applicable trouble codes?

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3,240

Justin answered 3 years ago

Look over vacuum lines, at that age the hoses can become brittle and crack which can cause a number of different issues with rough idle being one of them

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RGriff61 answered 3 years ago

There is no error codes,hoses, compression, etc good. Approx 140,000 miles. I can just barely increase rpm's and it's smooth. It started after a oil change, so I'm wondering if something could of got bumped or not....idk

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RGriff61 answered 3 years ago

When warm idles around 1000 rpm in park and neutral. In gear drops to 800. No slack in throttle cable.

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