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air leaks 200

posted by  someone claiming to be dbostrom on  Mon Nov 11 05:52 CST 2002 [RELATED]


If the duct from the AMM to the TB is cracked, it means that the car will be adjusting the mixture not according to the amount of air moving as measured by the AMM but that amount of air plus what's leaking into the duct. This will adversely affect the mixture that the ECU ultimately decides is correct. Presumbably you'd end up with a lean idle, since the ECU would be supplying gas based only on what the AMM said should be the case. If the duct leak were large enough, the AMM would call for very little fuel since very little air would be going through the AMM. If the discrepancy were large enough, maybe there would not be enough fuel in the mixture to support combustion. In the meantime, the coldstart injector would be giving you enough unmetered gas to get the car started and running for a second or two.

Don't know about vacuum hose from AMM to TB. Never saw that, but that doesn't mean it can't exist on _some_ cars...





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