Sudden Rough Idle
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Senior User
Joined: Jun 2017
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That is a little out of my price range. I suppose I could sell it later.
If I knew the pinout for the O2 sensor and MAP I could back probe the connectors. I have insulation piercing probes too.
Second drive and no bad idle.
Something went right on this project. The ABS was not working. I read up on diagnosing the system. I removed the glove box to access the control unit. Found that the connector was not plugged in. Plugged it in. It passed the bulb test at start up and the slam-on-the-brakes test on the road. Pretty cool huh?
If I knew the pinout for the O2 sensor and MAP I could back probe the connectors. I have insulation piercing probes too.
Second drive and no bad idle.
Something went right on this project. The ABS was not working. I read up on diagnosing the system. I removed the glove box to access the control unit. Found that the connector was not plugged in. Plugged it in. It passed the bulb test at start up and the slam-on-the-brakes test on the road. Pretty cool huh?
FTE Chapter Leader
Joined: May 2006
Posts: 12,335
Likes: 1,312
From: Central Mississippi
Lightly lubricate the back of what ever connector & using a pointy object, work the weather-pack seal out of the back & make contact from the back.
Either with your probes or separate pins.
Example below:
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
You can work out the pinouts pretty fast with a multimeter. The O2 sensor will have 1 power wire, a ground wire and a signal wire. The MAP sensor will have the same.
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Second Ford cartridge DOA.
Sprayed with silicone spray and tried to remove the rubber seal but it did not move easily and I thought it might get damaged. I cut a 1.5 mm dia brass rod 2" long and rounded both ends by spinning it in a drill motor. These slid in easily parallel to the wire. The MAP sensor read a little high compared to a chart found on line.
I hope it is correct for my truck.
The O2 sensor is too inaccessible to do this. I will get connectors from the wrecking yard to make a break out box of sorts.
The check engine light came on briefly twice but I have not checked for codes.
Sprayed with silicone spray and tried to remove the rubber seal but it did not move easily and I thought it might get damaged. I cut a 1.5 mm dia brass rod 2" long and rounded both ends by spinning it in a drill motor. These slid in easily parallel to the wire. The MAP sensor read a little high compared to a chart found on line.
I hope it is correct for my truck.
The O2 sensor is too inaccessible to do this. I will get connectors from the wrecking yard to make a break out box of sorts.
The check engine light came on briefly twice but I have not checked for codes.
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Senior User
Joined: Jun 2017
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Opened, inspected most of the connectors and reseated. All looked good. Worked for fine for about six drives then it came back temporally. Both times the ambient was above 80 and when restarted after cooling a bit, it worked fine.
I did find that the spark plug wires 7&8 were switched at the distributor.
Since both scan tool cartridges were DOA it is hard to trouble shoot without it. I am planning on reworking the grounds. Any suggestions on how to do this will be appreciated.
The ABS light came on briefly while driving as did the check engine light.
I did find that the spark plug wires 7&8 were switched at the distributor.
Since both scan tool cartridges were DOA it is hard to trouble shoot without it. I am planning on reworking the grounds. Any suggestions on how to do this will be appreciated.
The ABS light came on briefly while driving as did the check engine light.
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Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
Opened, inspected most of the connectors and reseated. All looked good. Worked for fine for about six drives then it came back temporally. Both times the ambient was above 80 and when restarted after cooling a bit, it worked fine.
I did find that the spark plug wires 7&8 were switched at the distributor.
Since both scan tool cartridges were DOA it is hard to trouble shoot without it. I am planning on reworking the grounds. Any suggestions on how to do this will be appreciated.
The ABS light came on briefly while driving as did the check engine light.
I did find that the spark plug wires 7&8 were switched at the distributor.
Since both scan tool cartridges were DOA it is hard to trouble shoot without it. I am planning on reworking the grounds. Any suggestions on how to do this will be appreciated.
The ABS light came on briefly while driving as did the check engine light.
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Joined: Jun 2017
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Update:
I have been driving with no issues. The temperature reached 85 yesterday and the rough idle is back. Drove it later in the evening when it dropped off to 80 and no rough idle, but that trip was shorter.
I was talking to a guy in the parts store who has been chasing intermittent faults. He said that problems occur on his truck when the air gets hot.
Where should I stat looking?
I have been driving with no issues. The temperature reached 85 yesterday and the rough idle is back. Drove it later in the evening when it dropped off to 80 and no rough idle, but that trip was shorter.
I was talking to a guy in the parts store who has been chasing intermittent faults. He said that problems occur on his truck when the air gets hot.
Where should I stat looking?
FTE Chapter Leader
Joined: May 2006
Posts: 12,335
Likes: 1,312
From: Central Mississippi
I'm going to make this my stock answer/suggestion for any erratic condition from now on where a distributor or PIP has not been replaced.
Images here:
https://www.ford-trucks.com/g/album/7992010
Vehicle never set a PIP code. Distributor was replaced & runs great.
Remove the shutter wheel under the rotor & vacuum/blow with compressed air &/or clean with contact cleaner the PIP sensor.
Stiff brush is a plus.
Doesn't cost anything.
Images here:
https://www.ford-trucks.com/g/album/7992010
Vehicle never set a PIP code. Distributor was replaced & runs great.
Remove the shutter wheel under the rotor & vacuum/blow with compressed air &/or clean with contact cleaner the PIP sensor.
Stiff brush is a plus.
Doesn't cost anything.