12-28-2010, 11:58 AM | #1 |
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general a/f ratio question
I have looked at many ford truck forums and none are up on eec stuff... I have a 94 bronco 5.8 seems to be speed density ...i am not shure (no maf) ....it runs way rich .... it has dual exhaust no cats which could contribute to this ... i timed it up to about 14 degrees opened up plug gap ...the regular efi small block ford junk and it runs much better....
changed all sensors (they were due anyway) it still smells like raw gas out the pipes, did ford set the ecm way rich from the factory ????? any ideas would be great.... |
12-28-2010, 12:00 PM | #2 | |
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Quote:
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Eric 89 LX Coupe-Juiced 01 Lightning-Boost 06 TBSS |
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12-28-2010, 12:03 PM | #3 |
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brown ,replaced with motorcraft standard copper plugs
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'94 Bronco 5.8l eddie bauer (OJ edition) |
12-28-2010, 12:22 PM | #4 |
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Speed density systems don't take too kindly to a bunch of big mods like heads & cam. Switching to a mass air set-up would be ideal, but you could probably get by with a a/f ratio gauge and an adjustable fpr to lean it out.
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12-28-2010, 12:34 PM | #5 |
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i dont know if they make a maf conversion for the truck w/ two blade throttle body .....will look into fuel press reg /a/f ratio thing
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'94 Bronco 5.8l eddie bauer (OJ edition) |
12-28-2010, 01:10 PM | #6 |
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seems you have pointed me in the right direction .....after searching maf conversions....found speed density is "bank fired" , not true sefi which explains it all .... which will clear the way for heads cam ect.. all four injectors fire at same time instead of one at a time wow that sux might as well run a freakin carb....
THANKS.....
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'94 Bronco 5.8l eddie bauer (OJ edition) |
12-28-2010, 01:19 PM | #7 | |
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Also, just because you smell 'raw gas' at the tail pipes does not necessarily mean it is rich. It means that the combustion is not burning efficiently. Need to check all iginitions components. Do like Eric said and pull the plugs, see which cylinders look 'off'
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12-28-2010, 01:32 PM | #8 | |
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-Don 86GT (sleeping in the garage for now) 87 T-bird Turbo Coupe (daily driver) 87 Ranger ($100 work truck) Meat is murder!... Tasty, tasty murder. Last edited by 86GTPONY; 12-28-2010 at 01:39 PM. |
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12-28-2010, 02:48 PM | #9 |
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Somebody made a MAF conversion for these trucks (I have a '95 F-150 4x4 BTW), and may still make them. Summit used to carry them. Not ALL the F series/Broncos were bank fire. Being a '94 yours should be SEFI. The best way to check is by looking at the sticker on the computer where the bar code is. As was mentioned in another thread here recently, Ford changed a lot of stuff on the trucks from year to year, and sometimes at mid-year. But back on topic, like QWK posted, just because it smells like raw gas doesn't mean it's rich. If the plugs are brown, it sounds like the A/F is good to me.
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Eric 89 LX Coupe-Juiced 01 Lightning-Boost 06 TBSS |
12-30-2010, 09:25 AM | #10 |
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does the sticker on ecm say "sefi" or do i need a decoder ring ? the more research i do the more i realize i will most likely have to live with the non sefi setup due to the fact that there is no ecm that will take care of 4x4/e4od/sefi/maf/ obd1 no vehicle existed with that setup from ford , the lightning is maf/e4od/sefi config,but the 4x4 wont go into low range according to most info avail...
a/f ratio is prob good in combustion chamber ..just seems like a waste of fuel ...
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'94 Bronco 5.8l eddie bauer (OJ edition) Last edited by darkhorse; 12-30-2010 at 10:08 AM. |
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