How do I retune from high altitude to low altitude 76 2.7?
09-06-2007 | 01:35 AM
#1
Thread Starter
Intermediate
Joined: Jun 2007
Posts: 26
Likes: 0
From: Chattanooga TN
How do I retune from high altitude to low altitude 76 2.7?
How do I retune from high altitude to low altitude 76 2.7?
I purchased the car in Colorado Springs and know the car is located in Chattanooga TN. From 5000ft to 700ft Altitude change. The 76 2.7L seems to have a miss and is not running smooth at times, it seems a little jerky? Though the engine feels smoother and stronger when accelerating. Is this something easy to remedy or is this type of remedy only for highly trained Mechanics? thanks Mike in chattannooga (Newby)
I purchased the car in Colorado Springs and know the car is located in Chattanooga TN. From 5000ft to 700ft Altitude change. The 76 2.7L seems to have a miss and is not running smooth at times, it seems a little jerky? Though the engine feels smoother and stronger when accelerating. Is this something easy to remedy or is this type of remedy only for highly trained Mechanics? thanks Mike in chattannooga (Newby)
09-06-2007 | 02:30 AM
#2
Rennlist Member
Joined: Aug 2002
Posts: 227
Likes: 1
From: Golden, CO
could be as simple as the air mixture adjustment. On the top of the engine just to the right of the air box, there is a small vertical likht gage wire in a circle shape at the top. This is a locator - about 3" long with a rubber plug at the other end - that protects the opening for the air adjustment.
in your tool kit there may be an allen key (metric) maybe 3" in length. Pull the locator and gently insert the key until it connects. make note of the position. If you have a CO analyzer, should be easy to dial in. Otherwise, turn slowly--possibly clockwise--until the idle smooths out. I have to use this proceedure at emission testing time--every year with a tailpipe sniffer.
Check with the local PCA Club for a local wrench if needed. This forum offers a wealth of good stuff as well...
Jim
in your tool kit there may be an allen key (metric) maybe 3" in length. Pull the locator and gently insert the key until it connects. make note of the position. If you have a CO analyzer, should be easy to dial in. Otherwise, turn slowly--possibly clockwise--until the idle smooths out. I have to use this proceedure at emission testing time--every year with a tailpipe sniffer.
Check with the local PCA Club for a local wrench if needed. This forum offers a wealth of good stuff as well...
Jim
09-06-2007 | 05:00 AM
#3
RL Technical Advisor
Joined: May 2001
Posts: 11,871
Likes: 67
From: Portland Oregon
Hi Mike:
CIS systems automatically correct for air density (altitude) but it sounds like someone might have adjusted the CO screw for smoother running at 6000 ft.
You will need to have someone with a 4-Gas or wide-band O2 meter (Innovate LM-2 or like instrument) to reset the CO for you. I would NOT do this by ear.
CIS systems automatically correct for air density (altitude) but it sounds like someone might have adjusted the CO screw for smoother running at 6000 ft.
You will need to have someone with a 4-Gas or wide-band O2 meter (Innovate LM-2 or like instrument) to reset the CO for you. I would NOT do this by ear.
