sensor problems
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Junior User
Joined: Jun 2014
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From: Colorado springs
sensor problems
I posted awhile ago about my 89 bronco, and I still haven't made any headway. I got an obd1 code reader, and my neutral safety switch coded bad, and there is a circuit fault in the fuel system. The codes I got were 67o and 87c. The switch is for a c6 transmission and I've been told by every part store in my area that it has been discontinued. My cousin had a neutral safety switch brand new in the bag from autozone he got for his old 89 bronco, but the switch only has 4 pins where as the one I need has a female end with 6 pinholes. Is there a way I could convert over to the 4 pin switch or bypass the current one?
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Junior User
Joined: Jun 2014
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From: Colorado springs
Rock auto doesn't have them. If it helps, the bronco has a 351w(5.8) motor and a C6 electric shift transmission. I unplugged the neutral safety switch and managed to get her to drive a little. I hit 35 mph and at one point hit 3000rpm, which is better than usual because it usually cuts out at 2000 to 2500 or less going half that speed. Before it died it started lurching like the fuel was inconsistent, So that tells me that one of the fuel pumps isn't getting enough juice to pump correctly, which would be the circuit problem. So my question now is will the other switch I have with the 4pin connector work if I wire it in, and if not, how can I bypass the switch?
Posting Guru
Joined: Nov 2002
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From: Napa
Is this what your plug looks like? More Information for MOTORCRAFT SW5978
If so rockauto does have them (bottom choice of the two) ... RockAuto Parts Catalog
If not then oreilly's has some listed .... List: Neutral Safety Switch - 1989 Ford Bronco | O'Reilly Auto Parts
If you had a pic of what yours looks like it'd be easier to find a replacement (at least it would be easier for me
)
If so rockauto does have them (bottom choice of the two) ... RockAuto Parts Catalog
If not then oreilly's has some listed .... List: Neutral Safety Switch - 1989 Ford Bronco | O'Reilly Auto Parts
If you had a pic of what yours looks like it'd be easier to find a replacement (at least it would be easier for me
)
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Well there is your first problem.. there is no such transmission. Your truck has an E4OD trans and you need an MLPS sensor.
Postmaster
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From: Panama City
I just sent a message to someone who should be able to help you. He may pop in here in a minute. Or not
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From: Stanley, VA
Unfortunately the p/n I came up with is the same one that Zombieslayer came up with. F5TZ-7A247-A which crosses to Motorcraft SW-5978.
What you could do, and it involves a little work, take your old switch off and clean it up. There should be an engineering number on it somewhere. Post that and it can be crossed over to the part number for the switch.
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Junior User
Joined: Jun 2014
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From: Colorado springs
It isnt an E40D transmission. Its a three speed without overdrive. In the catalogs for parts the sensor I need is listed as being for a C6 with electric shifting. Im sort of new to this stuff but the regular sensor off a C6 doesnt match up. The rig still has the original motor and trans from 89 and as far as I know the 5.8 wasnt paired with anything but the C6 in that year? Through a spur of the moment thought I got her drivable, and it seems to run fine with the switch disconnected the way I have it in the picture. But I'll be removing it and looking for that number soon.
Fleet Mechanic
Joined: Sep 2003
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TMK, for the 1989 model year, the only two automatics available in the Bronco were the AOD (has TV cable from throttle down to the trans), or the C6 (has vacuum modulator to tell the trans the engine load). There is no electrically-shifted C6. And as you said, the C6 was paired with the 351/5.8L.
Could the "electric shifting" refer to the transfer case instead? I don't know what year the option of electrically-shifted (instead of lever) T-case first appeared.
Could the "electric shifting" refer to the transfer case instead? I don't know what year the option of electrically-shifted (instead of lever) T-case first appeared.
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Junior User
Joined: Jun 2014
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From: Colorado springs
I did a little bit of reading up, and the electric shift does involve the transfer case.. But I have a manual transfer case.
Lead Driver
Joined: Sep 2002
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From: Gateway to the West
While I would tend to agree with Torky, it is possible that some very late '89 models got the very early E4ODs. Moreover, Paul is correct. The C6 was vacuum regulated. (Shift points were controlled by a vacuum regulator and a supply line from the engine). As such it had no such connector because the neutral safety switch only had a four-pin connector. The ONLY electronically shifted transmission (automatic) employed in the Bronco was the E4OD. The AOD was used for a time which uses a mechanical (throttle valve) cable-driven shift control mechanism. The AOD is a derivative of the old C4 if I am recalling correctly.
The connector/pigtail in the photo is the old style "round" connector for the first generation E4OD. Your parts guys are telling the truth when they say the first gen. E4OD parts are obsolete. Ford redesigned the E4OD between the 1993 and 1994 model years and they yanked every part for the older units along with not releasing tooling rights to any aftermarket suppliers for them. Replacing the MLPS connector (shown above) requires splicing in a newer elliptical connector AND replacing the MLPS.
The connector/pigtail in the photo is the old style "round" connector for the first generation E4OD. Your parts guys are telling the truth when they say the first gen. E4OD parts are obsolete. Ford redesigned the E4OD between the 1993 and 1994 model years and they yanked every part for the older units along with not releasing tooling rights to any aftermarket suppliers for them. Replacing the MLPS connector (shown above) requires splicing in a newer elliptical connector AND replacing the MLPS.
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