Impala dies when going under 10mph


	Auto Repair Home	SEARCH POSTS	WHO'S ONLINE	LOG IN

Automotive Repair

Car Troubleshooting Topics
  Car Troubleshooting
  Engine Troubleshooting
  Engine Fault Codes
  Electrical and Wiring
  Transmission Problems

Car Repair Topics
  Car Making Noises
  Car Stereo Repair
  Heating or AC Issues
  Motorcycles and ATVs
  Tricks of the Trade
  Truck Repair Advice

Site Options:
  Login
  Sign up here!

Latest Forum Post

1989 toyota pickup 3.0 crank no start

I have a 1989 toyota pickup 3.0 crank no...

Strut spring orientation and strut mount tension nut

2017 Nissan rogue awd 2.5 L Put in Monro...

Transmission stuck in part, I have tried everything

So I'm working on my elderly fathers 201...

2017 dodge journey LED headlights on/off randomly

Year of vehicle 2017 Make of vehicle dod...

Kia Soul starter replacement issues!

Okay so my car is a 2010 Kia soul 2.0 en...

Please Help - Knock sound & engine fail

Hi all, Hoping to get some insight and ...

multiple warning lights

2013 GMC Terrain 130,000 miles 4 cylinde...

03 alero no low speed blower

Good day everyone, I have a 2003 Olds a...

04 Chevy 2500hd tail light issues

Help!!! I have changed my combo switch...

1999 Grand Caravan Sport not starting.

Hi. I'm new here. I hope someone can hel...

Impala dies when going under 10mph

Sign up here!

Search for (search options)

Auto Repair Home>> Automotive Repair>> Car Troubleshooting

RubenWolff
New User

Dec 23, 2009, 2:05 PM

Post #1 of 5 (2510 views)

Impala dies when going under 10mph	Sign In

2000
Chevrolet
Impala
Engine size 3.8
Mileage : 137000 miles

I was changing my oil with a friend and he had a connector for his computer to the car to see what the engine light was for. There was a problem with the MAF so we decided to try and clean it. Getting to the sensor was a lot harder than we thought we we just cleaned a very dirty grid filtering the air that was going into the engine. After doing this the error code was still there but some more problems arose.

When sitting in park the car sounds as if its about to die and then reves the engine to stay alive. This cycle just keeps repeating and alternates between ~700 rpms and ~1400 rpms.
If i'm standing with the brake applied in R or D the car starts shaking and dies pretty often. But if i'm in P or N it still does the strange rpm alternation but stays running and does not shake the car.

Also sometimes when I take my foot off of the accelerator at 30mph or so the car will start accelerating by itself.

Thanks for any help !!

chickenhouse
Enthusiast

Dec 23, 2009, 2:10 PM

Post #2 of 5 (2506 views)

Re: Impala dies when going under 10mph	Sign In

Could possibly be an iac. Toothbrush (old & used) & a can of throttle body & injector cleaner. Engine off, intake snorkle off, spray into the throttle body and brush inside to clean up 130k miles of carbon deposits. A little hole by the iac needs attention also. iac is the idle air control valve. Let us know.

Sidom
Veteran / Moderator
Sidom profile image

Dec 23, 2009, 8:57 PM

Post #3 of 5 (2498 views)

Re: Impala dies when going under 10mph	Sign In

If the throttle body is coked up, then it would be a good idea to clean as suggested....

Exactly what code are you getting? What did you use to clean the MAF with? If you unplug the MAF & run the engine does it make a difference?

t.mcglaughlin317
New User

Dec 24, 2009, 8:59 AM

Post #4 of 5 (2494 views)

Re: Impala dies when going under 10mph	Sign In

i kinda had a problem with achevy lumina that was like that.....the engine would rev in park at 3000 rpms and it peaked at 3000 rpms so it sounded like i was httin the gas over and over and over but wasnt....so we took this little black piece that has no label on that was hooked on the air intake im guessing, then the rev went to 700 rpms in park...however if i were to be driving and i stop it would die because it reved sooo low, it would even die when changing from reverse to drive...but i got rid of that piece of crap :)))

Sidom
Veteran / Moderator
Sidom profile image

Dec 24, 2009, 10:51 AM

Post #5 of 5 (2491 views)

Re: Impala dies when going under 10mph	Sign In

In Reply To

but i got rid of that piece of crap :)))

The black thing or the the Lumina??????

That litte black thing was/is a Mass air flow sensor................

(This post was edited by Sidom on Dec 24, 2009, 10:51 AM)

Search for (options) Privacy Sitemap