2007 Chevrolet Impala LTZ 3.9 engine - Chevy Impala Forums

It appears you have not yet registered with our community. To register please click here...

Chevy Impala Forums

Go Back   Chevy Impala Forums > Performance and Technical > Chevy Impala 8th Gen Discussion

Chevy Impala 8th Gen Discussion W-Body 2006-2013. Discuss all Chevy Impala 8th Generation Performance and Technical Discussion here.

Reply
 
LinkBack Thread Tools Display Modes
Old 02-07-2013, 04:48 PM   #1 (permalink)
Junior Member
 
billy2juanda's Avatar
 
Join Date: Feb 2013
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
2007 Chevrolet Impala LTZ 3.9 engine

I have shudder and vibration when driving car at level speed in high drive
gear, almost like engine lug, but completely disapears when speed is
increased and tranny gears down to standard drive, versus 3 cylinder eco
drive. Tried running premium gas and using injector cleaner for two fills
with no change in function. I am afraid of a developing transmission
problem...any suggestions or answers?

billy2juanda is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 02-07-2013, 05:04 PM   #2 (permalink)
Carpe Diem


 
donmateo's Avatar
 
Join Date: Aug 2009
Location: Racine, WI
Posts: 20,252
Thanks: 2,440
Thanked 1,974 Times in 1,344 Posts
Send a message via MSN to donmateo Send a message via Skype™ to donmateo
This has nothing to do with the website. Moved to proper forum.

__________________
www.basilonestopshop.com
Basil One-Stop Shop BBM Channel: C00120B93
Basil One-Stop Shop BBM Customer Service Chat Available
donmateo is offline   Reply With Quote Quick reply to this message
Old 02-07-2013, 08:20 PM   #3 (permalink)
8th Gen Antagonist
 
kingnutin's Avatar
 
Join Date: Mar 2009
Location: Vancouver , WA
Posts: 13,658
Thanks: 517
Thanked 1,202 Times in 791 Posts
Could you be a little more specific? Are you saying it only does this in 3cyl mode?

__________________
1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

kingnutin is offline   Reply With Quote Quick reply to this message
Old 02-10-2013, 07:44 AM   #4 (permalink)
Senior Member
 
EJFudd's Avatar
 
Join Date: Sep 2012
Location: Howell, MI
Posts: 122
Thanks: 0
Thanked 18 Times in 12 Posts
I get vibration in 3 cyl. mode around 40-50 MPH in my 08. I have ignored it since owning the car as 3 cyl. is not going to be as smooth.

__________________
2008 3.9 LT, 2013 LTZ
EJFudd is offline   Reply With Quote Quick reply to this message
Old 02-10-2013, 08:39 AM   #5 (permalink)
Senior Member
 
wde3477's Avatar
 
Join Date: Jan 2011
Location: Cape Girardeau, MO
Posts: 144
Thanks: 0
Thanked 7 Times in 7 Posts
I tend to get a bit of surging going on in that speed range when lightly loaded and almost coasting. Cleaning the MAF and mostly the throttle body seems to help quite a bit. Just be sure to use the right cleaner for the MAF!

Other than that, don't really note any vibrations - although the 3-cyl mode helicopter-sounding exhaust drone is a bit annoying, as is the slight bump when going between the modes. At least the lights don't dim when switching into 3-cyl mode, as they did on my '07 LT3. :-)

__________________
2008 LTZ - 200,000 miles
1989 F150 - 217,000 miles
1981 CJ-5 - 171,000 miles
wde3477 is offline   Reply With Quote Quick reply to this message
Old 02-10-2013, 09:15 PM   #6 (permalink)
Senior Member
 
jayman's Avatar
 
Join Date: Jan 2013
Location: Winnipeg, MB
Posts: 214
Thanks: 27
Thanked 36 Times in 28 Posts
The MAF uses a heated wire sensor. Very easy to destroy the MAF using the wrong cleaner. CRC and others offer the correct MAF cleaner

__________________
2012 Chevy Impala LS, 3.6 direct injection
jayman is offline   Reply With Quote Quick reply to this message
Old 02-11-2013, 04:46 PM   #7 (permalink)
Z71
Senior Member
 
Z71's Avatar
 
Join Date: May 2010
Posts: 260
Thanks: 0
Thanked 15 Times in 12 Posts
My '09 LTZ does not have this problem. That's because GM discontinued the AFM system on this engine. Probably for a good reason.

Z71 is offline   Reply With Quote Quick reply to this message
Old 02-11-2013, 06:43 PM   #8 (permalink)
TSS
Administrator

 
TSS's Avatar
 
Join Date: Mar 2010
Location: Michigan
Posts: 9,104
Thanks: 651
Thanked 1,082 Times in 596 Posts
I personally liked the AFM on my 09 5.3. I think they finally got it right, and then ended production. The 5.3 AFM in the 2010 Suburban I have for the winter works fairly well too.

__________________
2009 Impala SS (sold 3/2012);
2010 Buick Enclave CXL;
2010 Lincoln MKS AWD Twin Turbo, Livernois Motor Sports tuned, K&N Typhoon CAI, 0-60 in 4.20 seconds , 1/4 mile 12.80 @ 104 MPH



"Trying Times Are Not a Good Time To Quit Trying"
TSS is offline   Reply With Quote Quick reply to this message
Old 02-12-2013, 06:44 PM   #9 (permalink)
Senior Member
 
wde3477's Avatar
 
Join Date: Jan 2011
Location: Cape Girardeau, MO
Posts: 144
Thanks: 0
Thanked 7 Times in 7 Posts
IMO, the AFM seems to do what was intended - noticing a 1-2mpg bump whenever it can stay in 3-cyl for longer periods.

Going up and down a relatively flat Interstate - at 60-65, it stays in 3-cyl mode a lot. The sweet spot seems to be around 70mph (the speed limit in MO) where it's constantly acting like a woman - can't make up its mind what it wants to do. At 75 and up, pretty much in 6-cyl all the time.

Heard tell that GM discontinued the AFM because of customer complaints about the little blip when switching between modes. Haven't been able to verify this, though.

Suggest AFM is a good concept, and to date has been reliable - just a better choice for the larger displacement motors that have the surplus torque and more extra cylinders to spare.

One thing I noticed was the statement seen somewhere that I can't currently recall about the importance of using the correct viscosity oil for proper AFM functioning. I do notice that the vehicle stays in 6-cyl mode longer in cold weather until things are really warmed up - not sure if this is an intentional emissions thing, or a cold, thick oil thing.

On another note - can't wait for summer gas to return. Fuel economy is tanking on this winter blend.

__________________
2008 LTZ - 200,000 miles
1989 F150 - 217,000 miles
1981 CJ-5 - 171,000 miles
wde3477 is offline   Reply With Quote Quick reply to this message
Old 02-12-2013, 10:07 PM   #10 (permalink)
Senior Member
 
jayman's Avatar
 
Join Date: Jan 2013
Location: Winnipeg, MB
Posts: 214
Thanks: 27
Thanked 36 Times in 28 Posts
If its oil try a synthetic 5W-30. GM used to recommend a synthetic 0W-30 if temps <-22 F. Ok just checked my owner manual they still do, but should be a Dexos for my car as well. So far have not found a Dexos rated 0W-30.

The made in Germany Castrol Syntec 0W-30 is a damn good oil, should be good enough to meet Dexos

I too get a kick out of winter "emissions" blend gas. How does getting lower fuel economy help our environment??

__________________
2012 Chevy Impala LS, 3.6 direct injection
jayman is offline   Reply With Quote Quick reply to this message
Old 02-13-2013, 04:24 PM   #11 (permalink)
Senior Member
 
wde3477's Avatar
 
Join Date: Jan 2011
Location: Cape Girardeau, MO
Posts: 144
Thanks: 0
Thanked 7 Times in 7 Posts
Quote:
Originally Posted by jayman View Post
I too get a kick out of winter "emissions" blend gas. How does getting lower fuel economy help our environment??
Eh, IIRC, winter blend was originally intended to help with cold starts - the fuel being more volatile than its summer counterpart. Towards the emissions side, I suppose the extra fuel consumed per mile going on down the road is more than offset by not puking out so many unburned hydrocarbons out of the gate?

__________________
2008 LTZ - 200,000 miles
1989 F150 - 217,000 miles
1981 CJ-5 - 171,000 miles
wde3477 is offline   Reply With Quote Quick reply to this message
Old 02-13-2013, 11:05 PM   #12 (permalink)
Senior Member
 
jayman's Avatar
 
Join Date: Jan 2013
Location: Winnipeg, MB
Posts: 214
Thanks: 27
Thanked 36 Times in 28 Posts
The winter blend was originaly designed for cold start ease, especially with carb engines. Fuel injected engines have much less cold start issue.

The EPA mandated reason, per this article from the EPA

http://epa.gov/otaq/regs/fuels/sai.pdf

is to lower CO in areas that have higher onroad vehicle CO emissions. What they don't seem to address is the increase in PM10 emissions

__________________
2012 Chevy Impala LS, 3.6 direct injection
jayman is offline   Reply With Quote Quick reply to this message
Old 02-14-2013, 08:38 AM   #13 (permalink)
OEM LOL

 
Ejbiers's Avatar
 
Join Date: May 2012
Location: Raritan, NJ
Posts: 3,780
Thanks: 439
Thanked 655 Times in 502 Posts
It's the government what do you expect.?.

__________________

2012 WRX LIMITED
Cobb Stage 2 @ 18psi

Know the truth
http://infowars.com
Ejbiers is offline   Reply With Quote Quick reply to this message
The Following User Says Thank You to Ejbiers For This Useful Post:
kevin (02-20-2013)
Old 02-14-2013, 10:47 PM   #14 (permalink)
Senior Member
 
jayman's Avatar
 
Join Date: Jan 2013
Location: Winnipeg, MB
Posts: 214
Thanks: 27
Thanked 36 Times in 28 Posts
Higher taxes, less take home pay, more government workers telling me what to think, say, and do

Oh, wait a minute, you were asking a rhetorical question. Sorry

__________________
2012 Chevy Impala LS, 3.6 direct injection
jayman is offline   Reply With Quote Quick reply to this message
The Following 3 Users Say Thank You to jayman For This Useful Post:
12ltz (02-15-2013), Ejbiers (02-15-2013), volume (02-15-2013)
Old 02-15-2013, 09:09 AM   #15 (permalink)
OEM LOL

 
Ejbiers's Avatar
 
Join Date: May 2012
Location: Raritan, NJ
Posts: 3,780
Thanks: 439
Thanked 655 Times in 502 Posts
You should be sorry cause if it saves one child...

At least i got back a 1/10th of what they took from me.

Took 20k gave me back 2k

And they taxed my tax return from last year because thats taxable income

__________________

2012 WRX LIMITED
Cobb Stage 2 @ 18psi

Know the truth
http://infowars.com
Ejbiers is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply


Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy Impala Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
2007 Retired Police Impala Engine Surging while Driving ???? lakeborn Chevy Impala 8th Gen Discussion 15 09-02-2014 01:43 PM
i have a chevy biscayne and the engine cast # is 3921968,is that the original engine? Alfonso M Chevy Biscayne 3 09-06-2008 12:52 PM
1963 Chevy Impala 283 engine w/powerglide engine swap to a LS1 & 4l60E? Ben Chevy Impala Discussion 0 05-03-2008 03:50 AM
How can I quiet my engine down? I have 87 chevy caprice 5.0 v8 and the engine is... Jonathan Chevy Caprice 4 02-20-2008 06:09 PM
How can I quiet my engine down? I have 87 chevy caprice 5.0 v8 and the engine... Jonathan Chevy Caprice 1 02-20-2008 02:41 PM




Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0 ©2011, Crawlability, Inc.
This site is not affiliated nor endorsed by General Motors Corp. Chevy Impala and related trademarks are the property of General Motors Corp.