Troubleshooting my 4Runner

[SteveHeadedWest]

Howdy,
I saved up my first post to be an engine question. Thanks to this forum I've fixed the center console lights and a few other things. But my first post is a question.

I recently purchased a 2006 V8 Limited. Out of the gate I was getting terrible mileage. I was new to the car so I didn't pay attention to it. I just put in a K&N drop in air filter. My computer went from 12.8 to 14.8 on the same stretch of road, same driving. That gave me at least +2mpg immediately. It also sounds great.
Now that I've had the car for about a month I'm thinking something is wrong. I am averaging 15mpg and I'm driving like a kitten. When I'm parked and revved at 1500rpm it feels rough. Everything else is smooth but its definitely rough at 1500rpm.

I bought an ELM 327 and connected it to Torque via my android. It's showing me a few errors. I'm wondering if this is related to my engine running rough at 1500 and giving me terrible mpg.

Thanks in advance to anyone that can interpret this and help me troubleshoot my 4Runner.
Here's the failed portion of the report from the OBD:

MID:$d0 TID:$03
Low sensor Voltage for switch time calculation -
Max: 287.44% Min: 78.09%
Test result value: 655.26996%
FAIL
----
MID:$d0 TID:$0c
Misfire counts for last/current driving cycles(calculated) -
Max: 53,281 Min: 6,424
Test result value: 56,224
FAIL
----
MID:$d0 TID:$24
-
Max: 24,682ms Min: 26,872ms
Test result value: 19,040ms
FAIL
----


Thanks!
-Steve

 

[oljedi11950]

Could be cpl things , plugs , a/f sensor , o2 sensors all things you can change & also clean your maf .

 

[SteveHeadedWest]

Thanks.
The O2 Sensor passed the test and graph for it looks normal.
Based on other posts it sounds like the MAF could be the problem.
When I changed the air filter it was filthy. There's a good chance there's some crud that got through to the MAF.

I'm going to try to clean the MAF today. I need to find a local source for the cleaning spray.

 

[SteveHeadedWest]

I kept reading posts how people ordered the CRC spray on Amazon.
I was expecting an expensive, hard to find product.

Its in stock at the local autozone for 8 bucks.

This will get done today. Update later.
Thanks for the help.

 

[SteveHeadedWest]

Cleaning the MAF seemed to increase MPG but I'm still having a rough spot at 1500 rpm.
There are NO codes reported in the ecu.
NO error lights on the dash.

The test report from OBD shows "misfires".

Any idea what problem I'm chasing?


MID:$30 TID:$0c
Misfire counts for last/current driving cycles(calculated) -
Max: 53,278 Min: 6,424
Test result value: 56,224
FAIL
----
MID:$30 TID:$5d
-
Max: 28,674 Min: 7,777
Test result value: 65,527
FAIL

----
MID:$50 TID:$0c
Misfire counts for last/current driving cycles(calculated) - O2 Heater Monitor Bank 4 - Sensor 4
Max: 53,283 Min: 22,808
Test result value: 56,224
FAIL
----
MID:$d0 TID:$06
Lean to Rich sensor switch time(calculated) -
Max: 28,672 Min: 7,745
Test result value: 65,527
FAIL
----
MID:$d0 TID:$0c
Misfire counts for last/current driving cycles(calculated) -
Max: 53,280 Min: 22,808
Test result value: 56,224
FAIL
----
MID:$d0 TID:$1e
-
Max: 28,687 Min: 7,809
Test result value: 65,527
FAIL
----
MID:$d0 TID:$24
-
Max: 24,682ms Min: 26,872ms
Test result value: 19,040ms
FAIL
----
MID:$f0 TID:$0c
Misfire counts for last/current driving cycles(calculated) -
Max: 53,281 Min: 6,424
Test result value: 56,224
FAIL
----


Thanks,
Steve

 

[oljedi11950]

It's possible your ecu needs to relearn , try undo pos batt cable for like 30 min . Redo & let idle for awhile might take longer but try that 1st , don't want to mention the bad case scenario here ! Plus the fwd a/f sensors could be a problem too they read the gases before cats they do go bad & are a real bi^%h to change .

 

[toyo]

Couple of questions first.

Mileage?
Is the MIL on?

If the MIL is not on, I would not put too much thought into what you are reading. If a sensor is bad it will kick your light on. They are very sensitive.

If your engine is misfiring as much as this says your MIL will come on as well. When you have a bad coil or plug you will have 2 codes. One will be a misfire detected, the other one will be a code P0301, 2, 3, 4, 5, 6, 7, 8. The last digit will the cylinder # of the problem.

Clean the MAF 1st. You can get the cleaner at just about any auto parts store. Just give it about 3 or 4 quick shots. That is all you need.

Remove the battery cables. Depress the brake pedal 5 times to drain any reserve current in the ECM.

Connect battery, go on a 10 to 15 mile drive of varying speeds. Then report back.

 

[SteveHeadedWest]

Thanks to both of you.

There's 152xxx miles on it. I don't know the age of the plugs or coils.

After the MAF was cleaned I was getting poor mileage as the ECU was learning. I kept driving and now its getting the great mpg.

Maybe I am reading too deep into the vibration at 1500rpm and the misfires.
Maybe there's nothing wrong. I don't want to ignore something small if it can be fixed.
There are no error lights on the dash. No errors reported in the ECU. Nothing except for what I report above of misfires.

I'll let it sit without the battery tomorrow and go for a ride.

Thanks,
Steve

 

[SteveHeadedWest]

Update:
Everything is running well. I had a few weeks of city and country driving to see how its doing.

I went ahead and got a set of plugs online using a discount code I found on this forum. :whoo:

The plugs I removed looked relatively new. They were NGK g-power and my replacement set were irridium... so I swapped the g-power for the irridium even though they looked relatively new. It's a new-to-me truck and now I know for sure when the plugs were changed. You never know what the stealerships do to these babies.

She is running very nice right now. New plugs. New K&N air filter. Cleaned the MAF. Pulled the battery and reset everything. Tire pressure adjusted even all the way around. Riding nice.

My OBD reports are clean except for that same bank 4 error. It may be nothing at all.
If the coils are the same, maybe I could move the coils and see if the error changes bank. If it does, maybe something is wrong with a coil causing the large number misfires.
If its as simple as moving coils around I could give that a try.
I don't want to move them if they shouldn't be moved.

Thanks for the help and suggestions.

 

[jeffreykb]

O2 Bank 4 Sensor 4 FAIL

Update:
Everything is running well. I had a few weeks of city and country driving to see how its doing.

I went ahead and got a set of plugs online using a discount code I found on this forum. :whoo:

The plugs I removed looked relatively new. They were NGK g-power and my replacement set were irridium... so I swapped the g-power for the irridium even though they looked relatively new. It's a new-to-me truck and now I know for sure when the plugs were changed. You never know what the stealerships do to these babies.

She is running very nice right now. New plugs. New K&N air filter. Cleaned the MAF. Pulled the battery and reset everything. Tire pressure adjusted even all the way around. Riding nice.

My OBD reports are clean except for that same bank 4 error. It may be nothing at all.
If the coils are the same, maybe I could move the coils and see if the error changes bank. If it does, maybe something is wrong with a coil causing the large number misfires.
If its as simple as moving coils around I could give that a try.
I don't want to move them if they shouldn't be moved.

Thanks for the help and suggestions.

Steve,

I am getting the same FAIL message...but just one FAIL message (see FAIL message below)

MID:$10 TID:$0c
Misfire counts for last/current driving cycles(calculated) - O2 Bank 4 Sensor 4
Max: 53,287 Min: 22,808
Test result value: 56,224
FAIL

- Was you able to determine and resolve the issue with the "bank 4 error"?
- If so, could you please share the steps to resolve the issue?

The "Check Engine Light" does not stay illuminated after starting engine on our 2007 4Runner V6 4x4, and no fault codes...just a failure for this test. We just completed a trip from Colorado to Texas which averaged 19 - 21 mpg. I have not noticed any rough idling; but it would be great to resolve the issue for this test failure to keep things running smooth (and maybe some improvement in mpg).

Thanks in advance,
Jeff