96 FZJ80 missing at Bad at 2800-3500 RPM full throttle

[SUMOTOY]

Intriguing, and I might suggest that the real test would be to install that LT MAF in another truck with a SC (or even without an SC). IIRC, looking at some of the data off the LT MAF, it stays in closed loop longer than the stocker. Which means when MAF changed back to the stocker, maybe covering up the fact you have bad 02 input/s, or you have blowout from your plugs.

The question is did you really solve the problem, or cover it up. If that modified MAF works in another truck (which I suspect it will), you have not solved the problem.... Or did you?

My .02 arbitraged thru the peso

Scott J
94 FZJ80 Supercharged

 

[landtank]

As far as the modded MAF goes it could be nothing more than needing to be cleaned.

This is rather common with this style sensor on all the applications that Toyota uses it on. The air filter does allow some very fine dust through which will eventually cause a problem. This usually takes years of use but since we typically use our trucks in dirty environments and especially if you are in a dry climate it can happen quicker.

If you ever watched "2 roads to baja" the lead FJcruiser went down for a few hours due to this which cost them the race.

The other thing which ties into what Scott is suggesting is that the stock sensor will inherently have the engine running richer during WOT. A lot richer, usually around 8.6 AFR verses 10.1 AFR with the newer style MAF. So you could be masking a problem injector or something similar.

 

[clownmidget]

Interesting stuff that doesn't seem to be resolved....

Rick -or anyone else that cares to comment- what do you think is going on with some of the different trucks that most likely have different versions of the US-speck ECU (minimally 3 versions)?

MINO's post in your vendor thread (https://forum.ih8mud.com/merchandis...k-performance-maf-housing-18.html#post7150097)

My CEL chasing here (https://forum.ih8mud.com/80-series-...n-i-use-rich-exhaust-smell-3.html#post7201973)

And this thread?

I spoke with another member that has the same CEL for knock sensor coupled with bad fuel economy that is running the modified MAF.

I'm fairly certain, especially on my truck, that the hardware is all working perfectly and that it's an ECU problem. Something in the MAF inputs when using the newer style of sensor seems to end up triggering the knock sensor circuit and throwing an erroneous code and putting the engine in safe mode.

 

[sledge916]

Did you know the history of the MAF sensor #22204-21010 Toyota Denso sensor.

no, whats the deal with it?

Sethro

 

[sledge916]

As far as the modded MAF goes it could be nothing more than needing to be cleaned.

This is rather common with this style sensor on all the applications that Toyota uses it on. The air filter does allow some very fine dust through which will eventually cause a problem. This usually takes years of use but since we typically use our trucks in dirty environments and especially if you are in a dry climate it can happen quicker.

If you ever watched "2 roads to baja" the lead FJcruiser went down for a few hours due to this which cost them the race.

The other thing which ties into what Scott is suggesting is that the stock sensor will inherently have the engine running richer during WOT. A lot richer, usually around 8.6 AFR verses 10.1 AFR with the newer style MAF. So you could be masking a problem injector or something similar.

after I took the LT MAF out I checked the sensor under a very bright LED lit magnifying glass I use at TecRehab.com (magnifies cell phone parts) I did notice dirt on the filter side of the sensor, extremely small black dust/dirt. I am sure this contributed to the truck running bad. It was not really visible to the naked eye. I did not catch this until after I put the stock sensor back on. I was also down to 5.8 MPG with the LT MAF, I wish I would have tried cleaning the sensor wire, as mentioned I just did not see that dust so I did not think it needed it. I would have like to have seen if this would have solved the issue.

Last summer both knocks sensors were replaced,not very fun either. I see clownmidgit is having problems with those too.

I think all who use the LT MAF should clean that sensor at every oil change if the truck gets wheeled very much. Mine gets enjoyed often off road.

Sethro

 

[landtank]

I've only had two issues with the using the newer style sensor.

the sensor getting dirty and the pins within the connector not making a solid connector.

On the connector issue, I my self had a sensor that would not work. I swapped between the OEM sensor and this bad one several times and the truck always ran perfectly on the OEM sensor but wouldn't even start on the newer style one.

I finally traced it down to a bad connection at the plug and crimped the pins and that sensor is still in the truck today running fine today some 3 years later.

I attributed this to the fact that during the process of reconfiguring the wiring in the plug the pins now sit slightly different. Combine this with the likely hood that the pin's contacts will wear slightly from years of use and you have a situation where vibrations can start to have an effect on maintaining a reliable contact.

I've worked with a few people who have had the pin issue and once resolved have not had any more issues.

And there is still the possibility that you have a bad sensor, I don't make those.

 

[landtank]

after I took the LT MAF out I checked the sensor under a very bright LED lit magnifying glass I use at TecRehab.com (magnifies cell phone parts) I did notice dirt on the filter side of the sensor, extremely small black dust/dirt. I am sure this contributed to the truck running bad. It was not really visible to the naked eye. I did not catch this until after I put the stock sensor back on. I was also down to 5.8 MPG with the LT MAF, I wish I would have tried cleaning the sensor wire, as mentioned I just did not see that dust so I did not think it needed it. I would have like to have seen if this would have solved the issue.

Last summer both knocks sensors were replaced,not very fun either. I see clownmidgit is having problems with those too.

I think all who use the LT MAF should clean that sensor at every oil change if the truck gets wheeled very much. Mine gets enjoyed often off road.

Sethro

That's pretty cool. That dust is likely the culprit. It's accounted for a few CELs, pinging and more.

I've never had any issues but being up here in the damp North East we just don't have the dust issues.

 

[sledge916]

I've only had two issues with the using the newer style sensor.

the sensor getting dirty and the pins within the connector not making a solid connector.

On the connector issue, I my self had a sensor that would not work. I swapped between the OEM sensor and this bad one several times and the truck always ran perfectly on the OEM sensor but wouldn't even start on the newer style one.

I finally traced it down to a bad connection at the plug and crimped the pins and that sensor is still in the truck today running fine today some 3 years later.

I attributed this to the fact that during the process of reconfiguring the wiring in the plug the pins now sit slightly different. Combine this with the likely hood that the pin's contacts will wear slightly from years of use and you have a situation where vibrations can start to have an effect on maintaining a reliable contact.

I've worked with a few people who have had the pin issue and once resolved have not had any more issues.

And there is still the possibility that you have a bad sensor, I don't make those.

yes I did check and recheck the connections, I do see where they could cause problems. Bottom line for me is that I think my sensor was bad/dusty.
Sethro

 

[sledge916]

That's pretty cool. That dust is likely the culprit. It's accounted for a few CELs, pinging and more.

I've never had any issues but being up here in the damp North East we just don't have the dust issues.

Where I live is VERY dusty, I think everyone out west should clean the sensors often. I wish I would have known, oh well others will learn from this I hope.
Sethro