Abrupt Lean fuel Condition??
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,738
Likes: 53
From: Bogart GA
Abrupt Lean fuel Condition??
The car was running great the all of a sudden it leaned out. I know this because I use an LM-1 wide band O2 meter. It ran lean (popped and hesitated) at cruise and at idle. My vacuum appears to be fine. I also use a vacuum gauge. I isolated each of the vacuum lines coming off the intake just to make sure. No signs of a vacuum leak anywhere else. My fuel pressure at the carb is dead on as well. I plan on switching my O2 sensor to the other side just to see if it is the same eliminating the possibility of a hidden manifold leak. The only thing I can think of at this point is some sort of carb obstruction.
One thing I noticed was when I put my finger over the vent tube (Holley Carb) on the primary side, fuel gushed out of the boosters on the primary side. I never noticed that before. Not sure how that happens. I thought the vent tubes just vented the fuel bowls.
Any ideas?
Thanks
One thing I noticed was when I put my finger over the vent tube (Holley Carb) on the primary side, fuel gushed out of the boosters on the primary side. I never noticed that before. Not sure how that happens. I thought the vent tubes just vented the fuel bowls.
Any ideas?
Thanks
Race Director
Joined: Oct 2000
Posts: 15,009
Likes: 79
From: central FL, near the beach.
trace where the air gets out. dirt? look out!
takes a minute 2 try it. worked 2 mos ago for me. But it acted up again, so i took off the metering block today, gave it a mini-rebuild. Noticed the NOS(1978) PV was leaking, so it likely had 2 problems. took 1.5 hrs. seems ok so far. anyway i cleaned it with carb cleaner.
Last edited by Matt Gruber; Feb 21, 2008 at 11:37 AM.
