strong exhaust smell - Chevelle Tech
Troubleshooting Diagnosing problems done here.

 1Likes
Reply
 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 20 (permalink) Old Jul 8th, 08, 2:13 AM Thread Starter
Brandon
 
Join Date: May 2007
Location: Texas
Posts: 18
Question strong exhaust smell

I have a strong exhaust at idle and even when the car is driving. Even after the car has been parked for 15mins or so the smell is still there.
Moss22 is offline  
Sponsored Links
Advertisement
 
post #2 of 20 (permalink) Old Jul 8th, 08, 12:19 PM
Team Member
Jay
 
Join Date: Sep 2005
Location: North Olmsted, OH
Posts: 1,352
Re: strong exhaust smell

Smell like gas? Sounds like your car is running rich, just like mine. Have you checked your plugs? Read your plugs and post back. Probably will need to adjust your air/fuel mix on the carb.
Jay65SS is offline  
post #3 of 20 (permalink) Old Jul 8th, 08, 7:08 PM
Senior Tech Team
 
Join Date: Jan 2004
Location: Ca
Posts: 1,195
Re: strong exhaust smell

Did you change the cam to a more performance cam? Lot off performance cams will smell gas more than stock. Also check for exhaust leak, if you have one , and it is going in the car, it will smell bad
442 Harv is offline  
 
post #4 of 20 (permalink) Old Jul 8th, 08, 9:53 PM
Tech Team
Gary
 
Join Date: Nov 2006
Location: SoCal
Posts: 787
Re: strong exhaust smell

Some solutions to think about:
Trunk seal in good shape, no holes in trunk pan
No exhaust leaks at headers or collectors
PCV system in place and working
No fuel leaks such as a bad or missing fuel vent or cracked fuel lines


I went through all of these repairs and now am fume free, good luck

69 Chevelle Triple Black

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Smittie is offline  
post #5 of 20 (permalink) Old Jul 9th, 08, 12:53 AM Thread Starter
Brandon
 
Join Date: May 2007
Location: Texas
Posts: 18
Re: strong exhaust smell

Recently did the whole exhaust system from manifolds back, no new cam, and I have adjusted the new carb's air/fuel mixture. The car was running the same prior to the change of the carb and the exhaust, that is why I changed them. The plugs have been replaced also.
Moss22 is offline  
post #6 of 20 (permalink) Old Jul 9th, 08, 8:47 AM
Team Member
Jay
 
Join Date: Sep 2005
Location: North Olmsted, OH
Posts: 1,352
Re: strong exhaust smell

How do the plugs look? Should be a tan/brown color if burning clean. If your plugs are black you still need to make adjustments and maybe try a hotter plug.
Jay65SS is offline  
post #7 of 20 (permalink) Old Jul 10th, 08, 1:46 AM Thread Starter
Brandon
 
Join Date: May 2007
Location: Texas
Posts: 18
Re: strong exhaust smell

Yeah, checked the plugs and they are lite brown color. What is the best way to check for a fuel line leak?
Moss22 is offline  
post #8 of 20 (permalink) Old Jul 10th, 08, 7:47 AM
Team Member
Jay
 
Join Date: Sep 2005
Location: North Olmsted, OH
Posts: 1,352
Re: strong exhaust smell

Easy, park it the garage, let it run for a little bit then look for gas dripping on the floor. Put the car on jackstands and take a look at the fuel line and all the fittings and hoses, starting out back from the gas tank all the way to the fuel pump and carb. You will see and smell gas if it's leaking somewhere.
Jay65SS is offline  
post #9 of 20 (permalink) Old Jul 10th, 08, 2:52 PM Thread Starter
Brandon
 
Join Date: May 2007
Location: Texas
Posts: 18
Re: strong exhaust smell

Thanks, I'll try it this weekend and see how that goes. The motor is a numbers matching 327/325hp, could the smell be coming from using regular gas?
Moss22 is offline  
post #10 of 20 (permalink) Old Jul 10th, 08, 3:47 PM
Super Mod
Rich
 
Join Date: Oct 1999
Location: Waverly, NE USA
Posts: 15,494
Garage
Re: strong exhaust smell

Have you changed the distributor or modified the distributor so that you no longer have vacuum advance? Have you changed the vacuum advance can recently? The L79 requires a fairly unique (and sometimes hard to find) vacuum advance can that brings in the vacuum advance at very low vacuum readings. Most replacement vacuum cans have higher ratings and won't bring in the vacuum advance at idle thus causing it to run without enough advance and due to the overlap of the L79 cam will cause a lot of unburnt fuel to come out the exhaust causing smelly, eye burning exhaust fumes.

Concerning the regular gas, if you didn't change from the stock 11:1 compression I can't imagine it runs without knocking or pinging while using regular, but using regular in and of itself won't cause the exhaust smell problem.

If you drastically lowered the compression ratio, the combination of low compression and the large overlap in the L79 cam could be contributing to the smelly exhaust.

So:
1. Did you lower the comrpession ratio?
2. Does the engine have the original style L79 cam?
3. Has the vacuum advance system been removed or modified?

NCOA member #220
ACES member #1670
Team Chevelle #998

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Rich Cummings
Rich-L79 is offline  
post #11 of 20 (permalink) Old Jul 10th, 08, 4:21 PM Thread Starter
Brandon
 
Join Date: May 2007
Location: Texas
Posts: 18
Re: strong exhaust smell

The distributor has been changed the cam has not been touched, that I'm aware of.
Moss22 is offline  
post #12 of 20 (permalink) Old Jul 10th, 08, 5:25 PM
Super Mod
Rich
 
Join Date: Oct 1999
Location: Waverly, NE USA
Posts: 15,494
Garage
Re: strong exhaust smell

Quote:
Originally Posted by Moss22 View Post
The distributor has been changed the cam has not been touched, that I'm aware of.
What kind of distributor do you have now? Does it have a vacuum advance? If not, you need to get one with a vacuum advance. Once you have vacuum advance, you need a vacuum can that comes on at about 5.5 (inches of mercury).

In a stock Chevy distributor (not an HEI) the can you want will have the code "VC1810" or "B28".

Then, read this entire thread: https://www.chevelles.com/forums/show...t=ignition+101

NCOA member #220
ACES member #1670
Team Chevelle #998

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Rich Cummings
Rich-L79 is offline  
post #13 of 20 (permalink) Old Jul 13th, 08, 11:10 AM
Team Member
 
Join Date: Jun 2002
Location: N.Y.
Posts: 11,305
Smile Re: strong exhaust smell

FYI,VC-1810 has supposedly been discontinued,read below for details.

Scott
================================================== ===============
Echlin VC-1810 has been discontinued. The following to be interchageable with the ECHLIN VC-1810

AC Delco D1312C (GM Part # 88924985)
order online at www.gmpartsdirect.com

Borg-Warner V329
Niehoff DR305
Wells DV1810
Standard Motor Prod. VC177

SCOTT
1969 CHEVELLE SS396,ORIGINAL #'S MATCH,GOT IN 1978,(In 2001 rblt/bored original 396 .030 to 402)/M20/12BOLT/3:31'S
2002 MAXIMA (DAILY DRIVER/1 owner,GOT 3/2013 w-44k miles)
2009 HD ELECTRAGLIDE CLASSIC ULTRA (GOT 11/14 W-9,700 miles)
SWHEATON is offline  
post #14 of 20 (permalink) Old Jul 13th, 08, 11:43 AM
Senior Tech Team
Mark
 
Join Date: Apr 2003
Location: Southern CA
Posts: 4,404
Re: strong exhaust smell

if your still smelling fuel after turning off the motor 15 minutes later ........ you more then likely have a LEAK .... check all the rubber fuel line.... a guess would be back by the tank as its out of sight & pretty much forgotten by most people

"An expert is someone who has made every possible mistake within a very narrow field"
68KMENO is offline  
post #15 of 20 (permalink) Old Jul 13th, 08, 11:27 PM
Cat
 
Join Date: Jul 2008
Location: Paducah, Ky.
Posts: 1
Re: strong exhaust smell

Im having the same problem with strong exhaust smell while driving.It appears to be coming through the heat and air cond. vents. This is on a 72 ss small block with new exhaust to the rear.
Cat's ss is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech 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. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in










Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



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

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