Here is my output and it appears that everything looks OK but maybe my fuelinjectors need to be replaced and If so can someone provide me instructions onhow to remove the fuel injectors. I think the key is making sure the systempressure is removed so the fuel does not come running out.

I only have one cylinder that seems to be ok but the rest have the sameerror


Test report:
TID:$05 CID:$01
- Rich to Lean sensor switch time(calculated)
Min: 65,186
Test result value: 48
FAIL
----
----
TID:$09 CID:$46
- Time between sensor transitions(calculated)
Max: 34
Test result value: 66
FAIL
----
TID:$0a CID:$46
- Sensor period(calculated)
Max: 34
Test result value: 66
FAIL
----
TID:$0b CID:$48
- EWMA Misfire counts (average) for last 10 drive cycles
Max: 34
Test result value: 66
FAIL
----
TID:$0c CID:$48
- Misfire counts for last/current driving cycles(calculated)
Max: 34
Test result value: 66
FAIL

 

Hi cdma,

Hopefully some of our experts will respond, but in the meantime I'll think out loud. Faulty fuel injectors can cause misfires, but it's unlikely that 5 of them would fail simultaneously. If I'm not mistaken, the faults shown that are due to incorrect Rich to Lean sensor switching are referring to your Oxygen (O2) sensors. If one or more of your O2 sensors is misbehaving, the Engine Control Module (ECM) cannot properly adjust the Air-Fuel Ratio (AFR), and an incorrect AFR could cause the misfires that were reported. It's unlikely that multiple O2 sensors would fail simultaneously though, and multiple O2 sensor codes can sometimes indicate a problem with a catalytic converter.

Did your scanner turn up one or more standard OBDII fault codes, such as P0420?

Don

 

Thanks for your reponse. First off I am using torque app and I have no real faults showing up. These are register setting in the test results section and just takes a look at the registers and sees if it meets spec. I recently moved from Illinois to Albuquerque which there is about a 6000 ft difference in elevation and when you take a look at atmospheric conditions I am sure the diffence is a little more. So I am wondering if this has any play in it. So you know what I have done to the car I put new catalytic converts on about 10 years ago and change out two of the o2 sensors about 8 years ago. I also changed out ALL belts about a year ago. So with that history do you think I need to go get anything change based on the move. What is interesting is my son has a honda civic and his car actually has a check engine light that also shows a rich lean condition

 

I find it interesting that the reported "test results" for 4 of the five parameters is "66". That is not a maximum value you would expect as a power of two, and those are largely independent variables, so it seem like you may have some suspect data.

How did you draw the conclusion that 5 injectors were bad from the reported data?

 

I am just guessing based on the misfires. I really do not know what the problem is if any. I have ran the test multiple times and get the same output. Again there are no real idiot lights that are coming. It is all based on what I am seeing on the test results

 

Could this be a coil problem? They do not always cause a code on this engine.

 

Well I am hoping they were chnaged out when they changed out the plugs. Anyone have a way to see if this could be the problem

 

I think you are misinterpreting the data. What makes you say one cylinder is good? Maybe you are looking at data different from what you posted. Does the car miss or stumble?

I doubt anyone would change coils when they changed the plugs unless there was a reason to do so. Is there some other information you have failed to tell us?

 

That was just a snapshot. Here is more


Vehicle VIN: Not present Vehicle Manufacturer: Unknown Vehicle Calibration ID: Not present Unit and scaling information are not supplied with the data from the ECU for this type of vehicle. Consulting the manufacturers service book for this information is recommended. Test report: ------------------ TID:$02 CID:$01 - Lean to Rich sensor threshold voltage(constant) Max: 150 Test result value: 49 PASS ---- TID:$03 CID:$01 - Low sensor Voltage for switch time calculation Max: 50 Test result value: 10 PASS ---- TID:$04 CID:$01 - High sensor Voltage for switch time calculation Max: 250 **Min: 50 Test result value: 200 PASS ---- TID:$05 CID:$01 - Rich to Lean sensor switch time(calculated) Min: 65,186 Test result value: 48 FAIL ---- TID:$06 CID:$01 - Lean to Rich sensor switch time(calculated) Min: 6 Test result value: 65,535 PASS ---- TID:$07 CID:$01 - Minimum sensor Voltage for test cycle(calculated) Min: 205 Test result value: 307 PASS ---- TID:$07 CID:$02 - Minimum sensor Voltage for test cycle(calculated) Min: 205 Test result value: 307 PASS ---- TID:$08 CID:$01 - Maximum sensor Voltage for test cycle(calculated) Min: 34 Test result value: 66 PASS ---- TID:$09 CID:$46 - Time between sensor transitions(calculated) Max: 34 Test result value: 66

 

The only thing the data you posted so far indicates is slow lambda sensor response, and the data is highly suspect since it is unreasonable for the count to be "66" on each PID.

Again, I am only trying to get your frame of reference when I ask how you came to the conclusion that you had 5 bad injectors?

If you have no OBD codes and you have no drivability issues, I suggest you turn off your Torque application until you read some of the fuel trim tutorials in the X-308 stickies and/or other fuel trim information available on the internet.

 

Well I finally decided to tackle this. SO I figured I would start easy....change the plugs. So I went to pull the plugs out, that were supposed to be changed about two years ago and I don't think they did. As a matter of fact the plugs were not even seated properly to the point I had two full turns on 5 of the six plugs. Needless to say......misfiring is gone.

 

I had a similar experience on our Roadmaster years ago where worn plugs exhibited all sorts of behavior normally associated with more complex fuel/air/spark issues including big misses.

.

 

cdma, the prudent way to address misfire is to start by checking spark plugs and ignition coil, only if bad idling and lost of power during acceleration or cruising is when the injectors can be a suspect, making sure there is sufficient fuel pressure, change fuel filter accordingly.

If you need to replace/clean/overhaul your injector all you need to do to avoid fuel gushing out of the fuel rail hose is by letting the car seat for 30 to an hour, making sure you have rags place underneath those hose line, fuel will never splash is done accordingly.

On Injector, after taking out the injector you can mechanically/electrically check them, if the magnetic coil is still working (you can literally hear the clicking when applied with a 12 volts battery) then your chance is their still ok just needs cleaning.