I've got an 07 impala LS 3.5L V6. Car has a rough idle.... RPM's drops down to 550 to 600rpm once it reaches operating temp and it has been driving in stop and go traffic like when commuting to work.


Asked by Aug 27, 2014 at 08:17 PM about the 2007 Chevrolet Impala LS

Question type: Maintenance & Repair

So problem is this rough and low rpm idle
that drops to 550rpm once stopped at a red
light but when I run the a/c the idle comes
up to the normal for that car at 700rpm
however this rough idle is still there.  So I
replaced the plugs, wires, cleaned the mass
airflow sensor and throttle body thinking
that's my issue, well the idle started to
rocket to 900 to 1000 rpm but that's
because I disconnected the battery and
unhooked the sensors when I did my
cleaning the computer needed to relearn it's
factory idle preseting.  Car drove great for a
week, then idle was normal and before I
knew it that rough idle came back.  Guys I'm
stumped....NO CHECK ENGINE LIGHTS.....
maybe my exhaust ? Catconverter? Or
exhaust hanger or loose bolts cause the
vibrations? What gives? Maybe an early
failing stage for my 02 sensors?

6 Answers


Ok after living with that issue for 2 months finally got the problem solved. It was 2 items that were compromised. 1st being my power steering pump was in the beginning phase of seizing and failing. The pump began to create a rotational drag on the serpentine belt due to the resistance because the pump was seizing. That brought down the idle. 2nd was the bottom motor mount was completely shot I'm talking about there was no rubber what so ever. Replaced the serpentine belt, power steering pump and the motor mount and the car drives really smooth and quite. Car idles at 700rpm.

3 out of 3 people think this is helpful.
Alicia Mccall

Ive been having this same problem with my 08 impala when im on the hwy it only gets me up to about 60 and i have to keep accelerating to get anything higher

Leisha Jemison

Is it the battery?


It wasn't the battery, believe it or not I wrote that problem with that car about a year ago and solved it if you look and read out on my 2nd response. Fortunately, I am now the proud new owner of a new 2015 impala.

Kyle Cazes

How did you determine it was your steering pump


I determined that by 2 reasons. Power steering was getting a whining like noise much like it does when the fluid level is low but that wasn't the case the pulley was actually in the beginning phase of seizing up creating the whining noise and 2nd the bottom motor mount was shot completely deterioted so the motor was actually moving in the engine bay even at idle. Replaced both components and problem solved.

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions


Looking for a Used Impala in your area?

CarGurus has 35,738 nationwide Impala listings starting at $700.


Search Chevrolet Impala Questions

Chevrolet Impala Experts

#1 Danny Wang
Danny Wang
Reputation 1,510
#2 FordNut
Reputation 1,360
#3 Tom Demyan
Tom Demyan
Reputation 1,350
View All

Related Models For Sale

Used Chevrolet Malibu"
1,170 Great Deals out of 72,682 listings starting at $695
Used Dodge Charger"
705 Great Deals out of 30,268 listings starting at $1,995
Used Honda Accord"
1,319 Great Deals out of 78,664 listings starting at $1,395
Used Nissan Maxima"
466 Great Deals out of 24,113 listings starting at $800
Used Chrysler 300"
575 Great Deals out of 21,310 listings starting at $1,490
Used Toyota Camry"
1,656 Great Deals out of 98,536 listings starting at $895
Used Dodge Challenger"
506 Great Deals out of 25,655 listings starting at $7,980
Used Nissan Altima"
1,492 Great Deals out of 87,985 listings starting at $1,195
Used Chevrolet Tahoe"
1,127 Great Deals out of 36,604 listings starting at $1,695
Used Ford Mustang"
747 Great Deals out of 41,445 listings starting at $900
Used Ford Fusion"
1,458 Great Deals out of 79,565 listings starting at $1,450
Used Chevrolet Monte Carlo"
12 Great Deals out of 2,069 listings starting at $2,900
Used Buick LaCrosse"
410 Great Deals out of 18,327 listings starting at $1,200

Used Cars For Sale

2017 Chevrolet Impala LS For Sale
1,224 listings starting at $19,359
2016 Chevrolet Impala LS For Sale
29 Great Deals out of 677 listings starting at $16,900
2015 Chevrolet Impala LS For Sale
16 Great Deals out of 584 listings starting at $11,995
2014 Chevrolet Impala LS For Sale
14 Great Deals out of 355 listings starting at $11,500
2013 Chevrolet Impala LS For Sale
3 Great Deals out of 44 listings starting at $7,514