B16 EF fluctuating a/f ratio+ignition timing at Idle
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Honda-Tech Member
Joined: Jan 2012
Posts: 10
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From: Vermont
B16 EF fluctuating a/f ratio+ignition timing at Idle
Okay Ive been struggling with this problem for a couple months now and tried everything I can think of.
The air fuel ratio on my aem wideband will start out lean when i start it up, around 17 or so then richen up to 14.7. Once it gets to that point it starts fluctuating between 14.7 and 15.9 every 5 seconds or so.
When I go and check the ignition timing it flucuates in and out of spec at about the same rate as the a/f ratio does.
The car runs decently down the road, but doesn't have the power it should.
Ive tried everything i could think of.
Oil pressure is good, so is Fuel pressure.
Bled coolant
reset ecu
swapped out ecu for know good one
set idle screw to spec
The air fuel ratio on my aem wideband will start out lean when i start it up, around 17 or so then richen up to 14.7. Once it gets to that point it starts fluctuating between 14.7 and 15.9 every 5 seconds or so.
When I go and check the ignition timing it flucuates in and out of spec at about the same rate as the a/f ratio does.
The car runs decently down the road, but doesn't have the power it should.
Ive tried everything i could think of.
Oil pressure is good, so is Fuel pressure.
Bled coolant
reset ecu
swapped out ecu for know good one
set idle screw to spec
Thread Starter
Honda-Tech Member
Joined: Jan 2012
Posts: 10
Likes: 0
From: Vermont
Re: B16 EF fluctuating a/f ratio+ignition timing at Idle
Yeah a p28 chipped with crome. I put a p30 basemap on my other p28 which is brand new and is outfitted with neptune rtp, hooked it up. same exact thing.
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