HELP b16a turbo afr problem
12-14-2012, 09:45 AM
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HELP b16a turbo afr problem
Hello Honda tech, just recently my b16 eg hatch has started running lean up in boost, it has a built block and head, 450cc injectors dyno tuned and all that stuff, walboro 255, what could the problem be, my tuner says fuel pump is probably taking a ****, also it runs 10.0 crusing and it feels like there is a little hesitation, almost like the car is off when I let off the gas then When I push the pedal back down it will cut back in, idles at 14.8 sometimes and 10.0 sometimes but always cruises at a flat 10.0... in boost (10.0 psi) it will hit 12.5 afr then jump to 14.0 and it never did this before, is it the fuel pump or a bigger problem?
12-14-2012, 01:17 PM
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Re: HELP b16a turbo afr problem
Doesn't have two step, not stock injectors, tuner is far away. Could it be the fuel pump as far as the leaning out in boost goes, it just started doing it, I have no cels but the battery light has been on since I got car, sometimes when cruising the cel will pop on but I just turn the car off.and.on and it goes off, and that's like once in a blue moon
12-14-2012, 01:28 PM
#6
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Re: HELP b16a turbo afr problem
ok. you have a fuel gauge and boost gauge? Your readings are the same?
if your pump went bad why the high 10's on idle and crusing.
if your pump went bad why the high 10's on idle and crusing.
12-14-2012, 01:32 PM
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Re: HELP b16a turbo afr problem
Fuel gauge is on the filter tucked under intake, and my thought was the pump is on its way out not completely bad, it's read 10.0 s forever but it hasn't always leaned out up top, could it be a bad vtec solenoid?
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12-14-2012, 01:51 PM
#8
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Re: HELP b16a turbo afr problem
hey for first fix your alternator or belt, the low voltage affect your injectors cycle.
what are your vtec set? May be you need a retune.
what are your vtec set? May be you need a retune.
12-14-2012, 02:43 PM
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Re: HELP b16a turbo afr problem
Its had the battery light on for 6 months and boosted just fine 11.8 - 12.2 on 10 psi and it just started doing it, but I will change my alternator in the morning
12-14-2012, 02:50 PM
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Re: HELP b16a turbo afr problem
If your going to trouble shoot this do yourself a favor and buy a multimeter.
Check batt voltage with the car off. Should be at least 12 volts with the car off and 13.5 with the car on. that'll tell you if the alternators bad.
Also check your alternator signal voltage fuse in the fuse box.
Check batt voltage with the car off. Should be at least 12 volts with the car off and 13.5 with the car on. that'll tell you if the alternators bad.
Also check your alternator signal voltage fuse in the fuse box.
12-14-2012, 03:50 PM
#13
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Re: HELP b16a turbo afr problem
put the ecu fuse back in your fuse block..(i believe it's a 5 amp). check the code and go from there. just because your battery light is coming on doesn't mean your alt. is bad. if battery voltage is low, you have low fuel volume and possibly fuel psi.
at cruising fuel demand isn't high like when in wot under load.
at cruising fuel demand isn't high like when in wot under load.
12-14-2012, 07:21 PM
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Re: HELP b16a turbo afr problem
https://www.youtube.com/watch?v=VXax...e_gdata_player this shows crusing afr
12-14-2012, 08:03 PM
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Re: HELP b16a turbo afr problem
He's saying if you have low electrical system voltage then you'll have less fuel as the pump can't keep up at lower voltages.
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12-23-2012, 05:24 PM
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Re: HELP b16a turbo afr problem
no there is some validity to this possibility. ive had my gm 3bar go bad on me twice in the past 5 years and one of the symptoms was messed up afr. then again driving around on low voltage isnt a good thing either. with a healthy electrical system putting out about 14.5v cruising you could very well be in low 13s for voltage up top from the fuel pump draw.
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12-25-2012, 04:44 PM
#22
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Re: HELP b16a turbo afr problem
Im in with the bad MAP. Had this recently happen on a customers car. Had a nearly new GM style 3bar. The car would start off fine and as a couple minutes would pass in driving, it would slowly start getting richer and richer till the wideband would max out at 10.0AFR just in regular driving. I would try to find another MAP sensor and throw it in just to rule the possibilty out. And i would be figuring out the battery light issue.
12-25-2012, 04:57 PM
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Re: HELP b16a turbo afr problem
Im in with the bad MAP. Had this recently happen on a customers car. Had a nearly new GM style 3bar. The car would start off fine and as a couple minutes would pass in driving, it would slowly start getting richer and richer till the wideband would max out at 10.0AFR just in regular driving. I would try to find another MAP sensor and throw it in just to rule the possibilty out. And i would be figuring out the battery light issue.
You run a shop and that's how you troubleshoot??
12-25-2012, 05:03 PM
#24
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Re: HELP b16a turbo afr problem
No...i was just getting to the point quickly and saying thats what the problem ended up being. There were quite a few steps taken to trouble shoot the fuel system and other things. But how nice of you to jump to conclusions lol. Merry Christmas!
12-25-2012, 05:20 PM
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Re: HELP b16a turbo afr problem
Cold be a ton of different things. First thing is to check battery voltage with the car running, calibrate your wideband, check fuel pressure and also find another tuner. I put just as much effort into normal cruising as making power. No tuner should have you cruising at 10:1.