Shut off when put in reverse - Chevy Impala SS Forum
 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 04-12-2017, 07:54 PM Thread Starter
Junior Member
 
Join Date: Oct 2016
Location: Lancaster, CA
Posts: 9
 
Garage
Shut off when put in reverse

Occasionally my l99 Caprice shuts off when it's warm and I put it in reverse. Any ideas ?
MijayPadilla96 is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 05-11-2017, 03:17 AM
Senior Member
 
shudahadaV8's Avatar
 
Join Date: Jan 2012
Location: Jersey Shore, NJ
Posts: 289
 
Quote:
Originally Posted by MijayPadilla96 View Post
Occasionally my l99 Caprice shuts off when it's warm and I put it in reverse. Any ideas ?
Not enough info. Do you mean the transmission bogs down the engine and stalls it or do you mean it simply dies, like you turned the key off?
shudahadaV8 is offline  
post #3 of 7 (permalink) Old 05-14-2017, 07:54 PM
Senior Member
 
RefineryRob's Avatar
 
Join Date: Aug 2011
Location: Bay Area, California
Posts: 162
 
Garage
Me Too!!

Hey just chiming in with my experience.


This has happened about once a month. When i throw it in reverse...the rpm drops and the car just dies. Its not an abrupt stall but it seems the rpm's drop so much the car stalls.

I start it right back up, do it again and its fine for the next 4-6 weeks.


Rob.

ISSCA Member #2482

1996 Impala BBB: SLP Headers. K&N FIPK, Eibach Pro Kit, ZQ8s. Bilsteins. Gary's Opti, Battery, and Headlight Harness'. Vette Starter. Taylor ThunderVolts. NGKs. Stealth & Metering Bolt. Goodridge Brake lines. TB Bypass. Magnaflow CATs. Air delete. Alex Tune. DynoMax 959's. CrownVic MMC drive shaft. BMR Ext'd RCA's. 373's/Superbrute
GOALS: Road Race Trans/TC, LE1 or AI Heads and CAM.


RefineryRob is offline  
 
post #4 of 7 (permalink) Old 05-15-2017, 12:52 AM
Senior Member
 
shudahadaV8's Avatar
 
Join Date: Jan 2012
Location: Jersey Shore, NJ
Posts: 289
 
Guys. Not a lot of info to analyze, but I'll tell you what crossed my mind. The load on the engine is greater in reverse in the following way. The engine runs the transmission pump. Reverse demands a considerable increase in the transmission fluid pressure. This is accomplished by changing valves in the transmission that ultimately does load down the engine more than when in neutral or drive (car not yet moving). The ECM compensates for this by adjusting the running condition of the engine (tries to hold the idle). Now that doesn't say what is wrong, it just maybe helps you think about cause and effect.


Could be a transmission issue or an ECM compensation problem. A vacuum leak could be at fault as when the transmission loads down the engine in reverse, at low idle speeds, the ECM can't get back to a sane condition (mixture) because the proportion of unknown air to known air is too great. Hey ... nuts maybe, but I'd actually start there (vacuum), or somewhere where air and fuel mix matters at low RPM under load.
shudahadaV8 is offline  
post #5 of 7 (permalink) Old 05-15-2017, 11:44 AM
Senior Member
 
Z09B4U's Avatar
 
Join Date: Jul 2015
Location: Canada
Posts: 258
 
There is another resent thread that had a bad ground that failed when the reverse lights came on and killed the fuel pump.

Z09B4U
Z09B4U is offline  
post #6 of 7 (permalink) Old 05-15-2017, 11:08 PM Thread Starter
Junior Member
 
Join Date: Oct 2016
Location: Lancaster, CA
Posts: 9
 
Garage
Quote:
Originally Posted by shudahadaV8 View Post
Guys. Not a lot of info to analyze, but I'll tell you what crossed my mind. The load on the engine is greater in reverse in the following way. The engine runs the transmission pump. Reverse demands a considerable increase in the transmission fluid pressure. This is accomplished by changing valves in the transmission that ultimately does load down the engine more than when in neutral or drive (car not yet moving). The ECM compensates for this by adjusting the running condition of the engine (tries to hold the idle). Now that doesn't say what is wrong, it just maybe helps you think about cause and effect.


Could be a transmission issue or an ECM compensation problem. A vacuum leak could be at fault as when the transmission loads down the engine in reverse, at low idle speeds, the ECM can't get back to a sane condition (mixture) because the proportion of unknown air to known air is too great. Hey ... nuts maybe, but I'd actually start there (vacuum), or somewhere where air and fuel mix matters at low RPM under load.
It bogs down when it is put in reverse. I don't have any other vacuum related issues. Low idle she's fine. I just thought it could be something way worse. It's an intermittent thing once every couple weeks
MijayPadilla96 is offline  
post #7 of 7 (permalink) Old 05-16-2017, 07:39 AM
Senior Member
 
Join Date: Jan 2001
Location: St. Louis
Posts: 6,329
 
Quote:
Originally Posted by MijayPadilla96 View Post
....when it's warm...
The little piece above is not particularly applicable, but the bogging/dying in reverse sounds similar to a past issue with Tribute/Escapes that pointed to the IAC.

In the absence of other useful background on the car I would go for a basic scan for history codes at an OR/AZ/NAPA. And, other expected service items I'd be checking for no other reason would be PCV, EGR, the often rotted/vanished purge system hose splice at the tank, purge solenoid itself.....all that sorta stuff.

A couple smaller flubs can sometimes line up to cause an intermittent. Let everyone know what it turned out. The thread title is good with doing a future search eh.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, SLP SS, 3000 Edge, F/HO bars, METCO extendeds and CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear)
\'96FWB BUW-Butt Ugly White: SS Bars, METCO LCAs, Koni Reds, PowerTrax No-Slip
96 Black is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy Impala SS Forum 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:
OR

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
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not 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

 
For the best viewing experience please update your browser to Google Chrome