Lean mixture on drivers side of engine after alternator change, 2.7l /6 |
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Lean mixture on drivers side of engine after alternator change, 2.7l /6 |
tornik550 |
May 11 2018, 11:57 AM
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#1
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
I have a /6 2.7l with dual Weber ida3c’s. The engine was running great then last week I did two changes on my car. One was that I repositioned my air fuel gauges. I have dual AEM widebands- one for the drivers side bank and one for passenger side. In addition, I had to do some minor wiring work on my alternator which required me to remove my carbs, linkage, shroud, and fan. I did not remove the fuel hoses, I just unbolted the carbs and moved the out of the way. There were no major changes. I put new carb manifold gaskets on when reinstalling. No carb adjustments were made.
Now when driving, the 4,5,6 bank now reading a air fuel ratio of >21 and the other bank reads normal. The car is now sluggish from idle and idles rough. Occasionally when Erving the engine, the a/f ration shots down to 10 for a second. Seems to be running hot and doesn’t start as quickly as normal. Things that I considered that might have caused the problem. -plugged idle jets- checked and cleaned- no change -since I just moved the gauges- some sort of gauge issue. I doubled checked all wiring and all seems fine. Also- why would the engine be sluggish and hard to start if it was just a gauge issue? Doesn’t seem to be the case. -I check the linkage and there were no changes and everything seems to be functioning the smoothly. No adjustments were made. Could a linkage issue cause a lean issue like this? -maybe I bumped the distributor when removing the shroud? Why would only one bank be an issue then? -fuel pressure issue? I have a gauge before the fuel line splits to each carb and it’s running at 3 psi. -intake leak? I replaced and double checked each intake gasket. Ideas? |
mskala |
May 11 2018, 12:12 PM
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#2
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R Group: Members Posts: 1,926 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
Not an expert, but I would check floats and fuel levels on the bad side. Maybe hung up since moving carb around.
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