Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Andy H]

One bank appears to behave itself while the other sails off into the distance. Seems to me that crossed lambda wiring isn't the problem.

Are they genuine VX lambda sensors? Is one a different spec/manufacturer to the other?

What fuel pump are you using? Is the fuel filter clean? Is the fuel pressure regulator working correctly?

Are all the fuel injectors working properly? Is it worth getting them flow tested and/or ultrasonicly cleaned?

NB I don't know the answers to these questions (and don't know if they are the right questions to ask) but no one else seems to have asked them before :-/

[RossMk2]

One bank appears to behave itself while the other sails off into the distance. Seems to me that crossed lambda wiring isn't the problem.

Are they genuine VX lambda sensors? Is one a different spec/manufacturer to the other?

What fuel pump are you using? Is the fuel filter clean? Is the fuel pressure regulator working correctly?

Are all the fuel injectors working properly? Is it worth getting them flow tested and/or ultrasonicly cleaned?

NB I don't know the answers to these questions (and don't know if they are the right questions to ask) but no one else seems to have asked them before :-/

Thanks for your input Andy, all help is greatly recieved!

Right.... No they are not VX Lambda sensors and are different manufacturers, one is from AutoVaux mind. Fuel tank, pump ad filter recently changed and are working Astra Mk3 GSI items. FPR is a brand new GM item that replaced the 4.0bar that was once fitted.

As to the fuel injectors i have not ever had them tested so wouldnt know. Is it worth getting them sent away?

[Entwood]

Is it worth swapping the lambda sensors wires over for a few minute to see if the fault "transfers" ... I know it will screw things up over time as the system tries to correct things and can't ...  but for just a minute it shouldn't be too bad ?? Might help pinpoint a lambda problem ?

[Andy H]

One bank appears to behave itself while the other sails off into the distance. Seems to me that crossed lambda wiring isn't the problem.

Are they genuine VX lambda sensors? Is one a different spec/manufacturer to the other?

What fuel pump are you using? Is the fuel filter clean? Is the fuel pressure regulator working correctly?

Are all the fuel injectors working properly? Is it worth getting them flow tested and/or ultrasonicly cleaned?

NB I don't know the answers to these questions (and don't know if they are the right questions to ask) but no one else seems to have asked them before :-/

Thanks for your input Andy, all help is greatly recieved!

Right.... No they are not VX Lambda sensors and are different manufacturers, one is from AutoVaux mind. Fuel tank, pump ad filter recently changed and are working Astra Mk3 GSI items. FPR is a brand new GM item that replaced the 4.0bar that was once fitted.

As to the fuel injectors i have not ever had them tested so wouldnt know. Is it worth getting them sent away?

I'm fishing for differences between the two banks.

Is the lambda sensor on bank 2 the 'no-name' sensor ?? (passenger side on RWD so probably front bank on FWD [if gearbox is on passenger side of car]).

I'm hoping that Kevin will have an opinion on cleaning/testing the injectors.

Another thought, are any of the sensor cables run in close proximity to HT cables?

[Kevin Wood]

Valid points regarding injectors. We are clutching at straws now, after all.

I would say it's rare for them to clog but it can happen. I still say fire it up with the Lambdas disconnected and see what happens. If an injector on one bank were clogged (for example) it could send the lambda loop off but I would also expect a misfire.

Kevin

[Andy H]

Valid points regarding injectors. We are clutching at straws now, after all.

I would say it's rare for them to clog but it can happen. I still say fire it up with the Lambdas disconnected and see what happens. If an injector on one bank were clogged (for example) it could send the lambda loop off but I would also expect a misfire.

Kevin

Agreed.

With the tools available ("My Naff Code Reader") it shouldn't be necessary to spend money on new or refurbished parts (unless proven faulty).

[RossMk2]

Again lads, thanks for all the input!

Valid points regarding injectors. We are clutching at straws now, after all.

I would say it's rare for them to clog but it can happen. I still say fire it up with the Lambdas disconnected and see what happens. If an injector on one bank were clogged (for example) it could send the lambda loop off but I would also expect a misfire.

Kevin

It does misfire after a while, low down in the rev range then clears up as higher in the range. Im going to disconnect the sensors tomorrow, reset the O2 block learn values and take a reading wednesday and see whats happening and what you guys think if thats ok? Would that give the information needed for more assesment? Also.... hot or cold?

[Kevin Wood]

It does misfire after a while, low down in the rev range then clears up as higher in the range.

Lamba goes open loop over a certain level of engine load so I think that tallies with our other observations.

Kevin

[RossMk2]

As said i unplugged both sensors and reset the learn values and this is what we get 1st thing (i also took a recording but it seems a lot of text to flood the thread with):

"My Naff Code Reader" 090714 - PC based diagnostic tool                        
                        
Date and time>      12/01/2010. 07:26                  
                        
Workshop information:                        
                        
Please add your workshop                        
name in the settings window                        
                        
                        
Selected model>      1994      Omega-B      Engine      X 30 XE
                        
Control Unit:                         
                        
KW82 protocol initialized.                        
                        
ECU ID= PS      90457098      261203272      1267358445      4
                        
                        
Measuring blocks information:                        
                        
Identifier      1C                  
Battery Voltage      13.3 V                  
Immobiliser Signal      Not Received                  
Immobiliser      Inactive                  
TPS Signal (Throttle Position Sensor)      0.47 V                  
Simulated Idle Position      Active                  
Simulated Full Load Switch      Inactive                  
Mass Air Flow Sensor      0.80 V                  
Mass Air Flow Sensor      15 kg/h                  
Coolant Temperature      2.83 V                  
Coolant Temperature      37 °C                  
Intake Air Temperature      4.23 V                  
Intake Air Temperature      0 °C                  
Engine Type      6 Cylinder                  
Transmission Coding      Automatic Transmission                  
Park/Neutral Switch      R-D-3-2-1  12V                  
A/C Information Switch (Air Conditioning)      Inactive 0V                  
A/C Compressor Switch (Air Conditioning)      Inactive 0V                  
Telltale (Check Light)      Off 12V                  
Fuel Pump Relay      Active 0V                  
Spark Angle before TDC (Top Dead Centre)      2 °CA                  
Ignition Coil Cyl. 1+4 (Cylinder)      Load                  
Ignition Coil Cyl. 2+5      Spark                  
Ignition Coil Cyl. 3+6 (Cylinder)      Load                  
Knock Signal      Inactive                  
Knock Retard      0 °CA                  
Secondary Air Pump Relay      Inactive 12V                  
EGR Valve (Exhaust-Gas Recirculation)      Inactive                  
EGR Position Feedback (Exhaust Gas Recirculation)      0.60 V                  
Fuel Tank Ventilation Valve      0%                  
O2 Sensor 1      429 mV                  
O2 Sensor 2      566 mV                  
O2 Sensor Loop 1      Closed                  
O2 Sensor Loop 2      Closed                  
Air/Fuel Ratio 1      Rich                  
Air/Fuel Ratio 2      Lean                  
O2-Loop 1 Integrator      150 Steps                  
O2-Loop 2 Integrator      148                  
O2-Loop 1 BLM Idle (Block Learn Map)      128 Steps                  
O2-Loop 2 BLM Idle (Block Learn Map)      122 Steps                  
O2-Loop 1 BLM Partial Load (Block Learn Map)      128 Steps                  
O2-Loop 2 BLM Partial Load(Block Learn Map)      128 Steps                  
Hall Sensor      Inactive                  
Engine Speed Pulse      Inactive                  
Engine Speed      449 RPM                  
Idle Air Control      22 Steps                  
IAC Integrator (Idle Air Control)      171 Steps                  
IAC Adaptation Slope (Idle Air Control)      200 Steps                  
IAC Block Learn (Idle Air Control)      136 Steps                  
Desired Idle Air      60 kg/h                  
Actual Value Idle Air      12 kg/h                  
Desired Engine Idle Speed      1.050 RPM                  
Injection Pulse      5.0 ms                  
Engine Load Signal      1.7 ms                  
TPS Load Signal (Throttle Position Sensor)      0%                  
Vehicle Speed Pulse      Not Received 12V                  
Vehicle Speed      0 km/h                  
Intake Manifold Valve 1      Inactive 12V                  
Intake Manifold Valve 2      Inactive 12V                  
Torque Control      Inactive                  
A/C Cutoff Relay (Air Conditioning)      Inactive 12V                  
Diagnostic Request      Inactive 5V                  


Will take another look after a run around, injection pulse has not really moved has it?

[Andy H]

Ignition Coil Cyl. 1+4 (Cylinder)      Load                  
Ignition Coil Cyl. 2+5      Spark                  
Ignition Coil Cyl. 3+6 (Cylinder)      Load                  

Why does Cyl 2+5 report differently to the other 2 coils? Is it significant or is it just an "My Naff Code Reader" wrinkle?

A silly question.... Is the connector on the IAC the same as the one on the EGR ? Would it run at all if you connected them the wrong way round?

[RossMk2]

Ignition Coil Cyl. 1+4 (Cylinder)      Load                  
Ignition Coil Cyl. 2+5      Spark                  
Ignition Coil Cyl. 3+6 (Cylinder)      Load                  

Why does Cyl 2+5 report differently to the other 2 coils? Is it significant or is it just an "My Naff Code Reader" wrinkle?

A silly question.... Is the connector on the IAC the same as the one on the EGR ? Would it run at all if you connected them the wrong way round?

The Ignition Coils are constantly switching from load/spark should they be doing it in sync?

EGR valve is out th way up on the bulkhead, has never been unplugged.

[Kevin Wood]

Interesting that it still thinks the Lambda loops are closed. :-/ Maybe it'll take a while for it to realise they are gone and go into limp home.

Ignition will show the state when it took the snapshot but the data is not gathered fast enough to see the sequence.

Kevin

[Andy H]

The Ignition Coils are constantly switching from load/spark should they be doing it in sync?

OK, I'm not familiar with the software. Presumably it shows load when there is current flowing through a coil (and the spark occurs when the current stops). At 600 rpm idle (10 revolutions per second) each coil will be firing 10 times per second. It didn't occur to me that they would try to show that as live data.

EGR valve is out th way up on the bulkhead, has never been unplugged.

So no chance that the ECU is opening the EGR when it thinks it is opening the IAC then

[RossMk2]

Will give it a few miles then see if everything is as it should be with the sensors unplugged and report back

[Andy H]

Out of curiosity, do your throttles close completely? (or has the throttle stop screw been wound in to set the idle manually?)