Vapor canister vacuum
Thread Starter
Member
Joined: May 2014
Posts: 448
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From: Alpine
Car: 86 Trans Am
Engine: 305 LB9
Transmission: 700r4
Vapor canister vacuum
Quick question,
I've been getting terrible mpg in town. Approx. 12 mpg. Used to get 17 to 20 because of how easy I drive. Changed oil the other day and spark plugs were done a few months back. So I went snooping and I found the round portion on top of the vapor canister had its vacuum hose come loose and off. So I bought a new more snug fitting one at Autozone. Would that have had an adverse affect on my mpg? Or should I continue looking else where
I've been getting terrible mpg in town. Approx. 12 mpg. Used to get 17 to 20 because of how easy I drive. Changed oil the other day and spark plugs were done a few months back. So I went snooping and I found the round portion on top of the vapor canister had its vacuum hose come loose and off. So I bought a new more snug fitting one at Autozone. Would that have had an adverse affect on my mpg? Or should I continue looking else where
Supreme Member
Joined: Jan 2000
Posts: 3,178
Likes: 48
From: Tracy, CA
Car: '87 IROC
Engine: LB9
Transmission: TH700R4
Re: Vapor canister vacuum
In general, yes.
If you have a vacuum leak, this creates a lean mixture condition which the O2 sensor will report to the ECM. The ECM in turn will try to richen the mixture by decreasing the injector dwell time (the time the injector is off). Net result, your engine is now running overly rich.
If you have a vacuum leak, this creates a lean mixture condition which the O2 sensor will report to the ECM. The ECM in turn will try to richen the mixture by decreasing the injector dwell time (the time the injector is off). Net result, your engine is now running overly rich.
Thread Starter
Member
Joined: May 2014
Posts: 448
Likes: 0
From: Alpine
Car: 86 Trans Am
Engine: 305 LB9
Transmission: 700r4
Re: Vapor canister vacuum
In general, yes.
If you have a vacuum leak, this creates a lean mixture condition which the O2 sensor will report to the ECM. The ECM in turn will try to richen the mixture by decreasing the injector dwell time (the time the injector is off). Net result, your engine is now running overly rich.
If you have a vacuum leak, this creates a lean mixture condition which the O2 sensor will report to the ECM. The ECM in turn will try to richen the mixture by decreasing the injector dwell time (the time the injector is off). Net result, your engine is now running overly rich.