Rovergauge again

[mgwanderer]

Hi Guys,
I got my rovergauge and the cable and after some searching about made a connection to my Chimaera and all seemed good but....

My original fault was car starts idles very fast then dies... (it smells rich)

so with rovergauge same happens but no faults are shown, the only thing I did see was my injector cycle fluctuating quite a lot.

I have tried another ECU
I have tried another distributor

Any Ideas as It is very frustrating, I would have hoped to see a fault somewhere from the system.

Clive

[blitzracing]

its a matter of looking at the stepper control and target idle when the rpm is high? The target idle is what the ECU is trying to reach against its actual idle, so lets say your actual idle is 1200 rpm, but it should be 800, the stepper should start to shut of the air supply in stages so the RPM drops. Typically on a warm engine the stepper will be about 30% open to get a good tick over. If it hits 0 and the rpm is still high, you have an air leak in the plenum area. Also check you have no speed reading, and the car is in idle mode (this means the throttle pot is in a closed position).

[mgwanderer]

Thanks for the reply but why am I not getting any fault codes when something is definitely not correct??

[Steve_D]

The 14CUX fault codes are very basic and sometimes completely irrelevant.
Just concentrate on the readings on screen and work from there.

Steve

[mgwanderer]

Hi thanks for the tips and I have pulled a few sensors out of the system and I find the error codes go red so I now have a little more faith in the system.

One more point the fuel relay seems to be switching on and off, is this normal, I think it is triggered from the distributor which is switching an earth which turns it on but, when I have put a permanent earth on the relay it still switches on and off??? (the relay has been changed)

Is this normal???

Many thanks in advance

Clive

[blitzracing]

Thats normal. It would be worth pulling a plug or two as well or see if they are sooty.Its also possible the AFM is failing and over fuelling the engine if you can smell fuel. Unfortunatley the ECU only really throws and AFM code if it has a very high or very low output , not simply if the output has gone a bit high so the ECU puts in more fuel. You can do a simple test on the AFM with a test meter that normally shows they are failing.


Thanks to Mark Adams for this bit:

Testing is performed in the following manner. Peel back the rubber boot on the airflow meter connector and leave it plugged in to the airflow meter. Set up the digital multimeter to read voltage. Insert the negative probe into the Red/Black wire (sensor ground), and the positive into the Blue/Green wire (Airflow signal).

Turn on the ignition, but do not start the engine. The meter should immediately indicate a reading of approximately 0.3-0.34 Volts after the initial "warm up" spike. Most defective airflow meters will overshoot to 0.8 Volts or higher, and take at least 2 seconds to come down to the correct voltage.

The important bit is the warm up voltage spike is only about half a second- so a two second spike shows the AFM is failing.

Edited by blitzracing on Monday 2nd March 16:39

[mgwanderer]

Thanks to everybody for the help and now another question,

Rovergauge will allow you to make a log file but how do i reply it??


Thanks in advance

Clive

[blitzracing]

If you want to use logging, first thing to do is only test the sensors you want, otherwise you gets loads of data you dont want. In your case id use:

Stepper motor position
AFM (absolute)
Short term fuel trim
RPM.

The logging function will only work if you run RoverGauge from the hard drive on your PC, otherwise it tries to write to the CD and fails. It puts the files in the log folder found in the RoverGauge folder. The Log file is not formatted so its just loads of numbers if you try and read it directly , so you need to frig about in MS word to get the columns to line up with the headings.

To convert the log files into a readable file:

1). Copy the data into a word document
2). Use the Edit- replace command to replace the , (comma) with a tab. You need to use the extended edit menu, replace, special, tab character.

Then copy the text from Word into Excel, so the tab character puts each value into a different cell. You will need to elongate the cells to match the headings.