1997 Vt Commodore issue

[Weglee]

either buy from holden
or experience with quality brands
when unsure just ask here
people will give their experience with different brands

i need to get another fuel pump what about the goss brand or oex

 

[Weglee]

replace spark plugs with NYK store brought, not ebay or amazon as are flooded with counterfeit chinese spark plugs
replace DFi with original or if you can borrow a dfi and coils from a friend

Plugs are NGK and lead got from autobarn i have replace the DFI and coils to original I had. I might have to put old oxygen sensors back in and also the coolant temp sensor as i got them from ebay.
pic is of origanl O2 sensor should i put them back or get new ones from autobarn

 

[lout]

try and get delphi if you can
have not heard that oex were doing fuel pumps, but there alternators and starters are excellent, so i would risk it
goss are not bad, but not my personal first choice, many have had good results with them

 

[Forcedvp]

As someone correctly stated earlier in this thread. If it were a fuel pump or fuel related, then the car would be randomly back firing. Those spark plugs look like they have been soaked with coolant.

 

[Fu Manchu]

Just put the original stuff back in. Loading the parts canon is not how to fix this.

Spark plugs off eBay etc is a dangerous dance. The market is flooded with counterfeit plugs, and they are excellent knock offs. It’s their internals that are rubbish.

 

[Fu Manchu]

Check for a vacuum leak, and a smoke test is a great way. Fairly easy to fabricate a smoker.

What ever is happening, it’s happening when heat is applied.

In the case of vacuum leaks, hoses will seal when cool and leak when hot. Where as gaskets tend to leak when cold and seal when hot.

Sensors that work when cold but faulty when hot.

It’s now a can of worms with all the ports swapping.

 

[Weglee]

Just put the original stuff back in. Loading the parts canon is not how to fix this.

Spark plugs off eBay etc is a dangerous dance. The market is flooded with counterfeit plugs, and they are excellent knock offs. It’s their internals that are rubbish.

Spark plugs and lead are not from ebay. I got them from autobarn.

 

[Fu Manchu]

The only way you are going to solve this is using wave form data from each and every sensor.

You need needle probes and they are inserted carefully into the back of each plug. The car is run and you see the data using an oscilloscope.

This takes a great degree of training and skill to do. Heat can be applied to each sensor with a heat gun. The sensors can be cooled with a cooling spray. The wave form data is analysed.

Sensor by sensor.

Vacuum leaks can also be diagnosed by experienced technicians using wave form data.

Coil wave forms can be read and injector pulses can be read.

This method is absolute. Its is the only way, other than pure luck, that you will resolve the issue.

You could load the parts canon and replace the entire car if you want, however the prevalence of faulty new parts is very common now. (Also why getting a workshop to do the work is of benefit). If you install a faulty part, you either falsely think the fault is not to do with the part involved or the fault you are trying to resolve.

There is no trick. You need to deal with data.

 

[Weglee]

The only way you are going to solve this is using wave form data from each and every sensor.

You need needle probes and they are inserted carefully into the back of each plug. The car is run and you see the data using an oscilloscope.

This takes a great degree of training and skill to do. Heat can be applied to each sensor with a heat gun. The sensors can be cooled with a cooling spray. The wave form data is analysed.

Sensor by sensor.

Vacuum leaks can also be diagnosed by experienced technicians using wave form data.

Coil wave forms can be read and injector pulses can be read.

This method is absolute. Its is the only way, other than pure luck, that you will resolve the issue.

You could load the parts canon and replace the entire car if you want, however the prevalence of faulty new parts is very common now. (Also why getting a workshop to do the work is of benefit). If you install a faulty part, you either falsely think the fault is not to do with the part involved or the fault you are trying to resolve.

There is no trick. You need to deal with data.

ok thanks heaps but i feel i should try to get a mechanic out

 

[Fu Manchu]

Most mechanics are not going to do diagnostics like that. They will swap parts also and do some guess work.

Who you need is a specialised diagnostic technician. They are who will find the fault with access to known good wave form data v what is being produced by your sensors. They will have a picoscope or similar. They will do proper back probing.