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Barometric pressure sensor question 1993 mustang 5.0
Does the 1991-1993 MAF fuel injection system include a barometric
pressure sensor, or is that only a feature of the earlier MAP type fuel injection? |
#2
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They all use a MAP sensor, the earlier is connected by hose to intake
while the later is vented to the atmosphere |
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Thank you.
I have a custom install that I am trying to sort out. It uses a MAF sensor and a 1993 A3M computer. There is a jumper between the anti fuel relay and the eec power relay. I assume that is to defeat the gas shut-off. My son and I tracked down the wiring from a mustang wiring diagram. The engine is the forged piston year... i believe earlier than the wiring. The wiring for the lower portion like engine coolant sensor, throttle position, EGR valve position, barometric pressure, sensors all come from the 1989-90 diagram. The wiring to the computer for the upper part of the diagram comes from the 1991-93 wiring diagram. fuel pump relay, canister purge, injectors, MAF sensor, etc. The engine is not running well, and I am trying to figure out what I have and how to diagnose it. I just went through all the wiring to make sure all connections and wire were good. Now I am back to tracking down issues. My original question you answered was regarding a local mechanic that looked under my hood. He said that there should not be a barometric sensor on the MAF engine. Obviously that gives you an idea of what I am dealing with locally. I am trying to do the work myself at this point. The motor is in a 1975 bronco. I sometimes go off-roading and worry something may shake loose and I would have no idea what to expect. At this point, I know most of the elements, now I just need to figure what to fix. The mustang wiring is only wired with four wires to the bronco. Other than that the system is self contained. I just have to figure out some problems. - low power - rich fuel - high idle - if gas punched or revved at all, it does not idle down very quickly Those are some of my problems. I am still looking for local mechanical assistance, but I am trying to support local mechanic with this news group. I appreciate any thought my mechanic look more closely at. The mustang motor is all stock except for a 4° cam advance to lower the torque.... stock cam, forged heads, in-tank mustang fuel pump. I am using the old bronco pulleys, water pump and such. Made the conversion easier. Well, thanks again for your answer. The mechanic will help I am sure. It's not the type of work mechanics generally seek out. Not much profit involved. He is just going to give me a couple hours and check some things. If I can suggest something from this message board, all the better. I can certainly check many things myself. Lawson eec power relay fuel Relay anti fuel relay Musttanguy wrote: >They all use a MAP sensor, the earlier is connected by hose to intake >while the later is vented to the atmosphere > > > |
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On Tue, 12 Jul 2005 19:35:29 -0500, Lawson[rem0ve]news rearranged some
electrons to form: > Thank you. > > I have a custom install that I am trying to sort out. It uses a MAF > sensor and a 1993 A3M computer. There is a jumper between the anti fuel > relay and the eec power relay. I assume that is to defeat the gas shut-off. > > My son and I tracked down the wiring from a mustang wiring diagram. The > engine is the forged piston year... i believe earlier than the wiring. > > The wiring for the lower portion like engine coolant sensor, throttle > position, EGR valve position, barometric pressure, sensors all come from > the 1989-90 diagram. > > The wiring to the computer for the upper part of the diagram comes from > the 1991-93 wiring diagram. fuel pump relay, canister purge, injectors, > MAF sensor, etc. > > The engine is not running well, and I am trying to figure out what I > have and how to diagnose it. I just went through all the wiring to make > sure all connections and wire were good. Now I am back to tracking down > issues. > > My original question you answered was regarding a local mechanic that > looked under my hood. He said that there should not be a barometric > sensor on the MAF engine. Obviously that gives you an idea of what I am > dealing with locally. > > I am trying to do the work myself at this point. The motor is in a 1975 > bronco. I sometimes go off-roading and worry something may shake loose > and I would have no idea what to expect. At this point, I know most of > the elements, now I just need to figure what to fix. > > The mustang wiring is only wired with four wires to the bronco. Other > than that the system is self contained. I just have to figure out some > problems. > > - low power > - rich fuel > - high idle > - if gas punched or revved at all, it does not idle down very quickly > > Those are some of my problems. I am still looking for local mechanical > assistance, but I am trying to support local mechanic with this news > group. I appreciate any thought my mechanic look more closely at. > > The mustang motor is all stock except for a 4° cam advance to lower the > torque.... stock cam, forged heads, in-tank mustang fuel pump. I am > using the old bronco pulleys, water pump and such. Made the conversion > easier. > > Well, thanks again for your answer. The mechanic will help I am sure. > It's not the type of work mechanics generally seek out. Not much profit > involved. He is just going to give me a couple hours and check some > things. If I can suggest something from this message board, all the > better. I can certainly check many things myself. > > Lawson > > any codes? > > eec power relay fuel Relay anti fuel relay > > Musttanguy wrote: > >>They all use a MAP sensor, the earlier is connected by hose to intake >>while the later is vented to the atmosphere >> >> >> -- David M (dmacchiarolo) http://home.triad.rr.com/redsled T/S 53 sled351 Linux 2.4.18-14 has been up 22 days 15:14 |
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What codes are you referring to? Sorry, I am learning as I go.
Lp David M wrote: >On Tue, 12 Jul 2005 19:35:29 -0500, Lawson[rem0ve]news rearranged some >electrons to form: > > > >>Thank you. >> >>I have a custom install that I am trying to sort out. It uses a MAF >>sensor and a 1993 A3M computer. There is a jumper between the anti fuel >>relay and the eec power relay. I assume that is to defeat the gas shut-off. >> >>My son and I tracked down the wiring from a mustang wiring diagram. The >>engine is the forged piston year... i believe earlier than the wiring. >> >>The wiring for the lower portion like engine coolant sensor, throttle >>position, EGR valve position, barometric pressure, sensors all come from >>the 1989-90 diagram. >> >>The wiring to the computer for the upper part of the diagram comes from >>the 1991-93 wiring diagram. fuel pump relay, canister purge, injectors, >>MAF sensor, etc. >> >>The engine is not running well, and I am trying to figure out what I >>have and how to diagnose it. I just went through all the wiring to make >>sure all connections and wire were good. Now I am back to tracking down >>issues. >> >>My original question you answered was regarding a local mechanic that >>looked under my hood. He said that there should not be a barometric >>sensor on the MAF engine. Obviously that gives you an idea of what I am >>dealing with locally. >> >>I am trying to do the work myself at this point. The motor is in a 1975 >>bronco. I sometimes go off-roading and worry something may shake loose >>and I would have no idea what to expect. At this point, I know most of >>the elements, now I just need to figure what to fix. >> >>The mustang wiring is only wired with four wires to the bronco. Other >>than that the system is self contained. I just have to figure out some >>problems. >> >>- low power >>- rich fuel >>- high idle >>- if gas punched or revved at all, it does not idle down very quickly >> >>Those are some of my problems. I am still looking for local mechanical >>assistance, but I am trying to support local mechanic with this news >>group. I appreciate any thought my mechanic look more closely at. >> >>The mustang motor is all stock except for a 4° cam advance to lower the >>torque.... stock cam, forged heads, in-tank mustang fuel pump. I am >>using the old bronco pulleys, water pump and such. Made the conversion >>easier. >> >>Well, thanks again for your answer. The mechanic will help I am sure. >>It's not the type of work mechanics generally seek out. Not much profit >>involved. He is just going to give me a couple hours and check some >>things. If I can suggest something from this message board, all the >>better. I can certainly check many things myself. >> >>Lawson >> >> >> >> > >any codes? > > > >>eec power relay fuel Relay anti fuel relay >> >>Musttanguy wrote: >> >> >> >>>They all use a MAP sensor, the earlier is connected by hose to intake >>>while the later is vented to the atmosphere >>> >>> >>> >>> >>> > > > |
#6
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On Tue, 12 Jul 2005 21:14:37 -0500, Lawson[rem0ve]news rearranged some
electrons to form: > What codes are you referring to? Sorry, I am learning as I go. > > Lp > Trouble codes from the computer. http://www.corral.net/tech/maintenance/eecivtest.html > David M wrote: > >>On Tue, 12 Jul 2005 19:35:29 -0500, Lawson[rem0ve]news rearranged some >>electrons to form: >> >> >> >>>Thank you. >>> >>>I have a custom install that I am trying to sort out. It uses a MAF >>>sensor and a 1993 A3M computer. There is a jumper between the anti fuel >>>relay and the eec power relay. I assume that is to defeat the gas shut-off. >>> >>>My son and I tracked down the wiring from a mustang wiring diagram. The >>>engine is the forged piston year... i believe earlier than the wiring. >>> >>>The wiring for the lower portion like engine coolant sensor, throttle >>>position, EGR valve position, barometric pressure, sensors all come from >>>the 1989-90 diagram. >>> >>>The wiring to the computer for the upper part of the diagram comes from >>>the 1991-93 wiring diagram. fuel pump relay, canister purge, injectors, >>>MAF sensor, etc. >>> >>>The engine is not running well, and I am trying to figure out what I >>>have and how to diagnose it. I just went through all the wiring to make >>>sure all connections and wire were good. Now I am back to tracking down >>>issues. >>> >>>My original question you answered was regarding a local mechanic that >>>looked under my hood. He said that there should not be a barometric >>>sensor on the MAF engine. Obviously that gives you an idea of what I am >>>dealing with locally. >>> >>>I am trying to do the work myself at this point. The motor is in a 1975 >>>bronco. I sometimes go off-roading and worry something may shake loose >>>and I would have no idea what to expect. At this point, I know most of >>>the elements, now I just need to figure what to fix. >>> >>>The mustang wiring is only wired with four wires to the bronco. Other >>>than that the system is self contained. I just have to figure out some >>>problems. >>> >>>- low power >>>- rich fuel >>>- high idle >>>- if gas punched or revved at all, it does not idle down very quickly >>> >>>Those are some of my problems. I am still looking for local mechanical >>>assistance, but I am trying to support local mechanic with this news >>>group. I appreciate any thought my mechanic look more closely at. >>> >>>The mustang motor is all stock except for a 4° cam advance to lower the >>>torque.... stock cam, forged heads, in-tank mustang fuel pump. I am >>>using the old bronco pulleys, water pump and such. Made the conversion >>>easier. >>> >>>Well, thanks again for your answer. The mechanic will help I am sure. >>>It's not the type of work mechanics generally seek out. Not much profit >>>involved. He is just going to give me a couple hours and check some >>>things. If I can suggest something from this message board, all the >>>better. I can certainly check many things myself. >>> >>>Lawson >>> >>> >>> >>> >> >>any codes? >> >> >> >>>eec power relay fuel Relay anti fuel relay >>> >>>Musttanguy wrote: >>> >>> >>> >>>>They all use a MAP sensor, the earlier is connected by hose to intake >>>>while the later is vented to the atmosphere >>>> >>>> >>>> >>>> >>>> >> >> >> > <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> > <html> > <head> > <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> > <title></title> > </head> > <body bgcolor="#ffffff" text="#000000"> > What codes are you referring to? Sorry, I am learning as I go. <br> > <br> > Lp<br> > <br> > David M wrote:<br> > <blockquote cite="midpan.2005.07.13.01.01.33.349569@sled351" type="cite"> > <pre wrap="">On Tue, 12 Jul 2005 19:35:29 -0500, Lawson[rem0ve]news rearranged some > electrons to form: > > </pre> > <blockquote type="cite"> > <pre wrap="">Thank you. > > I have a custom install that I am trying to sort out. It uses a MAF > sensor and a 1993 A3M computer. There is a jumper between the anti fuel > relay and the eec power relay. I assume that is to defeat the gas shut-off. > > My son and I tracked down the wiring from a mustang wiring diagram. The > engine is the forged piston year... i believe earlier than the wiring. > > The wiring for the lower portion like engine coolant sensor, throttle > position, EGR valve position, barometric pressure, sensors all come from > the 1989-90 diagram. > > The wiring to the computer for the upper part of the diagram comes from > the 1991-93 wiring diagram. fuel pump relay, canister purge, injectors, > MAF sensor, etc. > > The engine is not running well, and I am trying to figure out what I > have and how to diagnose it. I just went through all the wiring to make > sure all connections and wire were good. Now I am back to tracking down > issues. > > My original question you answered was regarding a local mechanic that > looked under my hood. He said that there should not be a barometric > sensor on the MAF engine. Obviously that gives you an idea of what I am > dealing with locally. > > I am trying to do the work myself at this point. The motor is in a 1975 > bronco. I sometimes go off-roading and worry something may shake loose > and I would have no idea what to expect. At this point, I know most of > the elements, now I just need to figure what to fix. > > The mustang wiring is only wired with four wires to the bronco. Other > than that the system is self contained. I just have to figure out some > problems. > > - low power > - rich fuel > - high idle > - if gas punched or revved at all, it does not idle down very quickly > > Those are some of my problems. I am still looking for local mechanical > assistance, but I am trying to support local mechanic with this news > group. I appreciate any thought my mechanic look more closely at. > > The mustang motor is all stock except for a 4° cam advance to lower the > torque.... stock cam, forged heads, in-tank mustang fuel pump. I am > using the old bronco pulleys, water pump and such. Made the conversion > easier. > > Well, thanks again for your answer. The mechanic will help I am sure. > It's not the type of work mechanics generally seek out. Not much profit > involved. He is just going to give me a couple hours and check some > things. If I can suggest something from this message board, all the > better. I can certainly check many things myself. > > Lawson > > > </pre> > </blockquote> > <pre wrap=""><!----> > any codes? > > </pre> > <blockquote type="cite"> > <pre wrap="">eec power relay fuel Relay anti fuel relay > > Musttanguy wrote: > > </pre> > <blockquote type="cite"> > <pre wrap="">They all use a MAP sensor, the earlier is connected by hose to intake > while the later is vented to the atmosphere > > > > </pre> > </blockquote> > </blockquote> > <pre wrap=""><!----> > </pre> > </blockquote> > </body> > </html> > > --------------040501040508030300010504-- -- David M (dmacchiarolo) http://home.triad.rr.com/redsled T/S 53 sled351 Linux 2.4.18-14 has been up 23 days 12:56 |
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I know you are correct as I was wondering if something had become
disconnected when I found the open connection. I checked the mustang book that said it was a vent. You have backed up that idea. thanks. Musttanguy wrote: >They all use a MAP sensor, the earlier is connected by hose to intake >while the later is vented to the atmosphere > > > |
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"Lawson[rem0ve]news" > wrote in
news:SmZAe.103458$gc6.75345@okepread04: > I know you are correct as I was wondering if something had become > disconnected when I found the open connection. I checked the mustang > book that said it was a vent. You have backed up that idea. thanks. > > Musttanguy wrote: > >>They all use a MAP sensor, the earlier is connected by hose to intake >>while the later is vented to the atmosphere >> >> >> > Let's make this perfectly clear: The Speed Density engines DONT have a MAF and use the term MAP for manifold pressure and they have a tube to a vacuum port. The MAF configurations use the same part, but called BAP without a tube and it measures atmospheric pressure. |
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Understood, I have a MAF sensor with the Barometric sensor open as a
vent, not connected to a vacuum. I had discussed my truck with a mechanic who noted the Barametric pressure sensor and he commented that it should not be on a MAF vehicle. That was wrong, and leads me to believe that I should locate another mechanic. Thanks. Backyard Mechanic wrote: >"Lawson[rem0ve]news" > wrote in >news:SmZAe.103458$gc6.75345@okepread04: > > > >>I know you are correct as I was wondering if something had become >>disconnected when I found the open connection. I checked the mustang >>book that said it was a vent. You have backed up that idea. thanks. >> >>Musttanguy wrote: >> >> >> >>>They all use a MAP sensor, the earlier is connected by hose to intake >>>while the later is vented to the atmosphere >>> >>> >>> >>> >>> > >Let's make this perfectly clear: > >The Speed Density engines DONT have a MAF and use the term MAP for manifold >pressure and they have a tube to a vacuum port. > >The MAF configurations use the same part, but called BAP without a tube and >it measures atmospheric pressure. > > |
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