- Thread starter
- #21
Thanks, guys,
and sweet ride Lazy!
and sweet ride Lazy!
RestoMod Questions for '75 FJ40
- Thread starter Mtnbiker588
- Start date
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- Thread starter
- #22
Hey Lil'John.
Now that the torrential downpour has stopped, I was able to get underneath and snap this pic. Looks like the sensor is right at the exhaust crossover junction. Couldn't tell you whether it's working or not though, until I get to the shop.
Thanks again for all the assistance.
- Kent
View attachment 1881856
Now that the torrential downpour has stopped, I was able to get underneath and snap this pic. Looks like the sensor is right at the exhaust crossover junction. Couldn't tell you whether it's working or not though, until I get to the shop.
Thanks again for all the assistance.
- Kent
View attachment 1881856
- Thread starter
- #23
Oops, another try
FJBen
SILVER Star
I hear you about braving the rain. My trip outside was poorly timed today
That doesn't look like a bad spot for it. I probably would have placed it another 6 inches back toward the rear to ensure both sides of the engine are accounted for.
Do you know if it got a vehicle speed sensor or not?
That made a difference on mine for sure. Sometimes it would lope at idle and do weird things because of the speed sensor. This was about 10 years ago so I'm sure there has been more research and better replacement parts for it.
Downey
SILVER Star
Sometimes 02 sensors are right in the exhaust manifold, or just barely down stream from the exhaust manifold, I believe your's is way too far down stream. It does not matter if the 02 sensor is reading one side of the engine only (i.e. adjusting air/fuel mixture on 1/2 the engine), provided 1/2 of your engine is not dead.
Thats way to far away from the exhaust manifold. You want in within around 12" of the collector of the manifold or headers. Whether or not the efi is the exact right combo for that motor, once the o2 is properly warm you should see some pretty good mpg because the efi will constantly try to shoot for 14.7 air fuel ratio. If its getting warm enough the engine has no way to monitor air fuel ratio except with the map sensor but that can make for it running crazy rich.
Thats way to far away from the exhaust manifold. You want in within around 3"-12" of the collector of the manifold or headers. Whether or not the efi is the exact right combo for that motor, once the o2 is properly warm you should see some pretty good mpg because the efi will constantly try to shoot for 14.7 air fuel ratio. If its getting warm enough the engine has no way to monitor air fuel ratio except with the map sensor but that can make for it running crazy rich.
T
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I believe that a heated O2 sensor is more than 1 wire. You can pull an O2 sensor and read it like reading spark plugs, if it is carbon fouled, then there is your clue.
Downey
SILVER Star
All of the smog legal Headers Downey built had the 02 sensor right up in the Header (we had to copy factory spec as close as possible).
- Thread starter
- #31
Thanks for the heads up Dizzy, I'll check to see if it is fouled tomorrow.
I'll also look for that speed sensor Lil'John.
Lazy- funny you mentioned the loping at idle, mine does that occasionally too.
Downy, I was thinking about having the guys replace the entire (rusty a*#) exhaust line when I go in for the skid plate, sliders and exhaust reroute. That seems like a great time to place the sensor properly.
If I new where to send em' , I'd buy you guys all a few rounds of beer for taking the time to help me out with this!
You guys rock!
- Kent
I'll also look for that speed sensor Lil'John.
Lazy- funny you mentioned the loping at idle, mine does that occasionally too.
Downy, I was thinking about having the guys replace the entire (rusty a*#) exhaust line when I go in for the skid plate, sliders and exhaust reroute. That seems like a great time to place the sensor properly.
If I new where to send em' , I'd buy you guys all a few rounds of beer for taking the time to help me out with this!
You guys rock!
- Kent
Downey
SILVER Star
1. Pick up a new weld-on 02 sensor bung in case your exhaust guy doesn't have one (unimaginable).
2. Kent, for your eye only: A year or two ago I quit telling guys with TBI that they needed a Vehicle Speed Sensor, too many chimed in that they were not using one and their rig ran good, so too many guys thinking I am an idiot. The VSS controls so many things that I don't see how you can merely program it out, so my guess is those rigs that are running "good" could be running "great"- - -just saying.
2. Kent, for your eye only: A year or two ago I quit telling guys with TBI that they needed a Vehicle Speed Sensor, too many chimed in that they were not using one and their rig ran good, so too many guys thinking I am an idiot. The VSS controls so many things that I don't see how you can merely program it out, so my guess is those rigs that are running "good" could be running "great"- - -just saying.
FJBen
SILVER Star
Completely agree with the VSS. I tried a few different VSS (at least the used ones I could find that fit) and they each did things a little differently, or nothing at all. There are a few companies that make aftermarket/conversion VSS that might be worth some research. I turned into the, "It runs pretty dang good" and quit messing with it before I sold it.
