Rough Idle under load?

NJshadow93 · 01-13-2013, 10:05 PM

Hey,

Drove the RAV4 as I dropped my 4Runner off at the dealership for the transmission service. I noticed the rav has a rough idle when in drive (such as stopped at a light). When I put it in park, it is smooth. It never did this before, so I'm not sure what it could be. Spark plugs perhaps? Spark plugs were replaced at the dealer at 102,500 miles. It has 146,127 now. Due for an oil change in a thousand miles. Any advice would be appreciated, thanks in advance.

IanXT4 · 01-14-2013, 02:13 AM

I would suspect that your throttle body is a bit gummed up with carbon. As you put the car on load at idle the car has to increase the amount of fuel/air very slightly if something is sticking slightly this can cause a rough idle.
At your mileage its definitely worth investigating how to clean your throttle body.

I gave mine a clean at 50000 miles after rough idle problems. My engine was a European 2l so location and cleaning details are different to yours. Before cleaning the car would be jerky if I tried to creep along in idle, after cleaning its was dead smooth.

01-13-2013, 10:05 PM	#1 (permalink)
NJshadow93 Member Country: Join Date: Jan 2011 Location: New Jersey Posts: 59 Thanks: 1 Thanked 2 Times in 2 Posts Feedback Score: 0 reviews	Rough Idle under load? Hey, Drove the RAV4 as I dropped my 4Runner off at the dealership for the transmission service. I noticed the rav has a rough idle when in drive (such as stopped at a light). When I put it in park, it is smooth. It never did this before, so I'm not sure what it could be. Spark plugs perhaps? Spark plugs were replaced at the dealer at 102,500 miles. It has 146,127 now. Due for an oil change in a thousand miles. Any advice would be appreciated, thanks in advance. __________________ 2005 Toyota RAV4 4WD 2.4 L VVT-I I4 --- now passed on to my sister at 129XXX miles (as of July 2011)...runs like new 2006 Toyota 4Runner SR5 V8 4X4-current tuck Also on T4R.org

01-14-2013, 02:13 AM	#2 (permalink)
IanXT4 Junior Member Join Date: Jan 2005 Posts: 23 Thanks: 0 Thanked 3 Times in 3 Posts Feedback Score: 0 reviews	I would suspect that your throttle body is a bit gummed up with carbon. As you put the car on load at idle the car has to increase the amount of fuel/air very slightly if something is sticking slightly this can cause a rough idle. At your mileage its definitely worth investigating how to clean your throttle body. I gave mine a clean at 50000 miles after rough idle problems. My engine was a European 2l so location and cleaning details are different to yours. Before cleaning the car would be jerky if I tried to creep along in idle, after cleaning its was dead smooth.

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