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Title: maf reading high g/s. cammed engine Post by: dilly on March 03, 2019, 08:33:04 PM buddy has a cammed 12v vr6 (AFP)
stock engine other than a mildly built head due to bending valves. it has 276 cams and HD springs runs like shit. I let him try my giac ecu but nothing changed what i did notice is that the maf at idle was reading 6-7g/s which from my experience is way too high considering my stock vr runs at about ~3 maf is good what i am assuming is that one of the maf tables need to be tweaked/scaled due to the increased amount of air being sucked in correct me if i am wrong and if you have insight i would appreciate the info thank you Title: Re: maf reading high g/s. cammed engine Post by: nyet on March 03, 2019, 08:42:39 PM what i am assuming is that one of the maf tables need to be tweaked/scaled due to the increased amount of air being sucked in What? No. Why on earth would you change the MAF tables unless you changed the housing or sensor? Title: Re: maf reading high g/s. cammed engine Post by: dilly on March 03, 2019, 08:59:40 PM What? No. Why on earth would you change the MAF tables unless you changed the housing or sensor? i don't know that is why i am asking Title: Re: maf reading high g/s. cammed engine Post by: dilly on March 03, 2019, 09:59:22 PM anyone have experience with cammed engines beit 2.7/8, vr, 1.8t etc wit this issue?
just want it to run correctly Title: Re: maf reading high g/s. cammed engine Post by: BlackT on March 04, 2019, 12:05:51 AM That is a amount of air that engine sucks in at idle,you can't do anything. The MAF and ECU are paired?
Title: Re: maf reading high g/s. cammed engine Post by: nyet on March 04, 2019, 12:19:30 AM trims, logs, dtc, etc.
Just going by g/s is pointless. Title: Re: maf reading high g/s. cammed engine Post by: Blazius on March 04, 2019, 01:55:41 AM Usually cammed long duration engines require a tiny bit more fuel to get them to idle properly. But personally I think the tractor sound is pretty good :P it just depends if its going to stall when when you are about to take off then you need to fix it.
Title: Re: maf reading high g/s. cammed engine Post by: _nameless on March 04, 2019, 06:38:14 AM Does the car have stock fueling, and maf? If so it should idle without issues. I have awp injectors in mine with a homemade mk3 short runner on my afp running corn juce with zero issues. I'd think you have a hardware issue
Title: Re: maf reading high g/s. cammed engine Post by: _nameless on March 04, 2019, 06:49:38 AM https://youtu.be/dKBsGB7tDnQ
Title: Re: maf reading high g/s. cammed engine Post by: dilly on March 04, 2019, 08:31:58 AM That is a amount of air that engine sucks in at idle,you can't do anything. The MAF and ECU are paired? yes they are pairedtrims, logs, dtc, etc. trims were jumping around +8 to +25 not holding steadyJust going by g/s is pointless. p1141 Load Calculation Cross Check Range/Performance Usually cammed long duration engines require a tiny bit more fuel to get them to idle properly. But personally I think the tractor sound is pretty good :P it just depends if its going to stall when when you are about to take off then you need to fix it. it does stall when coming back down to idle and throttle response it more than trash. it takes a second for it to react to pressing the pedalDoes the car have stock fueling, and maf? If so it should idle without issues. I have awp injectors in mine with a homemade mk3 short runner on my afp running corn juce with zero issues. I'd think you have a hardware issue everything is stock except for the cams and springsTitle: Re: maf reading high g/s. cammed engine Post by: dilly on March 04, 2019, 12:50:07 PM also he just told me that it has a 9lb flywheel
Title: Re: maf reading high g/s. cammed engine Post by: nyet on March 04, 2019, 02:51:27 PM yes they are pairedtrims were jumping around +8 to +25 not holding steady Doen't make much sense for the MAF to read high yet run lean. Something is very very wrong with the setup. Title: Re: maf reading high g/s. cammed engine Post by: dilly on March 04, 2019, 05:08:41 PM Doen't make much sense for the MAF to read high yet run lean. Something is very very wrong with the setup. Okay I will look into it further Might be an injector issue Odd thing is that it doesn’t break up or anything Once it catches itself it revs fine throughout the rev range but once it comes down to idle, that’s when it stalls or reallllly struggles to stay alive Title: Re: maf reading high g/s. cammed engine Post by: nyet on March 04, 2019, 05:13:40 PM Could be a vac leak, but i'd expect that to have low MAF readings and run lean.
Title: Re: maf reading high g/s. cammed engine Post by: BlackT on March 04, 2019, 10:31:30 PM What values are of vaccum in intake manifold. Does anything break the engine, like bad altenator/AC compresor or something like that?
Title: Re: maf reading high g/s. cammed engine Post by: _nameless on March 05, 2019, 09:21:00 AM Fwiw when. I pulled my intake manifold off I had a few injectors that fell apart. Also seen in the past injectors will fail
Title: Re: maf reading high g/s. cammed engine Post by: dilly on March 05, 2019, 11:06:29 AM thanks for the info guys
i will check the vacuum on the manifold and also try my maf and check his injectors. i'll keep you posted |