355 What's wrong with this injector waveform ?

To me it looks like 4.5 ms.

 

What is the problem with the car?

 

LIKE FBB said the wiring is horrible
I am ordering the Rigol MSO5074 as my usb is poop now so I bow out

Mitchell I think you got it covered of anyone I know so I'll watch

 

The pic on the right shows us, not ms.

 

The voltage range is 2 volts per division x10 due to the probe being on x10
I thought it was miss firing and it is running a little rough at idle but is running rich from the ecu adding fuel as fuel trims on bank 1 are 18 long term and climbing
I checked all vacume leaks and ignition issues and thought I had it solved due to 2 cylinders miss firing on the scope but it seems that 1 pigtail I maid for ease of testing was bad
Once fixed I am getting good results.

 

Ok
The scope as I am learning it does have a bug for recording the waves. It only saves the waveforms in the SCALE you have it set for when measuring.
Because these were my first tests I used ‘quick save” and it saved them to a reference area likely for you to put in good reference wave forms.
In order to look more closely at the trace I ZOOMED after the save and it made the wave form larger but changed the scale from 20 milliseconds to micro because I stepped down 4 or 5 times to zoom. So it was not measured at micro but at 20 milliseconds as above photo showed “unzoomed”

yes Mitchell in order to get you that I will check 1 cylinder at a time zoomed in while I am testing
The scope has many parameters and I will measure them all and you will see them at the bottom.
All scales will be correct then as well because I will do a scope picture of the trace. I just can not manipulate it after.

also it does have 2 vertical and 2 horizontal guides that will calculate both voltage and duration if used. after the trace is done you can manipulate those
But the only quirk is you can only screen shot it or video it unless I output it to a computer. The scope does not seem to have enough memory to save an active trace other than by leaving the trace on the screen and not shutting it off or trying to save it

 

Yes and I will

 

It is overfuelling at all rpm’s except wide open bank 1
It’s ignition related because once in a while it works for a few seconds.

 

Will due work is busy but Friday night I expect to get a few traces
It does not take too long with the pigtails fixed
I will just due 1 at a time and I am thinking trace 1 2 3 and 4 will be in conjunction with the traces
I also figured 5 6 7 and 8 I will make reverse so 8 and 1 will be trace 1 as you work from cabin to bumper

 

Yes likely
I think Mitchell nailed it that actual trace was at 20ms and I saved it. When I zoomed the scale changed incorrectly I think because it does not compute by the divisions and it’s the same trace

 

On a side note has anyone found where to buy this connector and pins Image Unavailable, Please Login

 

Is that the clear one or the white one? Are there any faint identifying marks on it? Without a brand name it would be hard to find.

If you were repinning all the wires, you could probably find a substitute. e.g.

https://www.alibaba.com/product-detail/Made-in-China-172496-1-automotive_1600476157312.html

The key searchword for the example above is "172496-1 9p". Then you'd have to find someone to sell you individual plugs, not 1000's.

Then you'd have to find heavy duty contacts (pins/sockets) for it. Are the originals round or blade type? I forget.

 

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Is this the one


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The other half of the plug seems to be 172506-1, but I still don't know if this is the right type. The labelling "Mark II" appears in some of the documents.

https://www.digikey.com.au/en/products/detail/te-connectivity-amp-connectors/172506-1/744769


You'd probably need the 16~20 gauge contacts as the coilpacks use that connector.

 

If the car is running rich all the time the pulse-with will be short
Try disconnecting a vacuum and look at the o2 aka lamda sensor to see if it reacts


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How are you defining "rich"? What is actually coming out of the tailpipes? Or what is being sensed by the O2 sensors?

 

??? If it was running rich and the O2 sensors sensed, it they would tell the ECU to narrow the pulse to eliminate the rich condition. If it could not lean the system out it would throw a CEL as fuel trim would hit a limit. But if it is continuing to run rich do to a malfunction I would expect the cylinders which were running rich to have excessive pulse width. No?

If it's just the 1-4 bank that is rich it should be straight forward to look at and compare the pulse width on the 5-8 bank with those on the 1-4 bank to see which cylinders on the 104 are rich.

 

The following scope readings tonight with all positive connections made to the negative wire on each injector(not the yellow wires)
Yellow is cylinder 1
Purple is cylinder 3
Measured all parameters

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Out the tail pipe and the lambdas are actually trying to richer it more and cat glows red if left idle too long

 

That’s what Mitchell said I think
I took some scans with the aligator clip on the probe wired to back end ground on chassis and probe to the negative on injector these are the latest
And to me something is not correct somehow it is sensing it needs more fuel but I am pretty sure it’s wrong but the lambda sensors do change
I am going to remove the spacers again between the lambdas and the sensors

 

I don’t completely understand this above
As I repair some minor vacuum leaks and it adjusted ltft from 23 down to 18 so I concluded vacuum leaks will make it run rich.
Which vacuum line do you think I should try

 

According to the wiring diagrams, the (positive) power wires should be green/black. The ECU (earth wires) are different colours. Only injector 4 should be yellow only (no stripes). Injector 3 should be yellow/red. Injector 8 should be yellow/green

How did your signal get so noisy? What does the waveform look like at 1 ms? We need to see the duration of the voltage dip for each pulse (and, perhaps as suggested, look at at least one cylinder on each bank at the same time to see if one side is being fed more fuel than the other).