When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
I tell ya, this would be a great chore for the Hantek.
Since you asked, it's an 8 channel oscilloscope that costs about 100 bucks (or there are ways to rent one). Anyway, you could test the performance of the CPS, CKS, injectors, and PCM (injector drivers). If you arbitrarily start replacing stuff, and the problem is the last shot of the parts cannon, you could end up dropping about 400 bucks.
Here's what a good injector looks like
and matching up CPS, CKS and one injector (the CKS is AFU cause the acquisition rate has been exceeded, but you get the idea):
And to do injectors you need an attenuator. They're pretty cheap, and I suppose you could get 6 and look at all of the injectors at once. But one is fine, just go down the line.
Update: I spliced in the new injector pigtails and now I have no more check engine lights! My engine is also no longer running like dog sh$t. The issue must have just been some bad connections between the old cracked plugs and the injectors. The bad news is that I still have a little bit of a rough idle that gets really rough if I give it a little gas right at 1k rpms (runs smooth anywhere after 1k). I'm not sure if this issue is related or just something else that happened to come up at the same time. Going to start checking for vacuum leaks now.
Update: I spliced in the new injector pigtails and now I have no more check engine lights! My engine is also no longer running like dog sh$t. The issue must have just been some bad connections between the old cracked plugs and the injectors. The bad news is that I still have a little bit of a rough idle that gets really rough if I give it a little gas right at 1k rpms (runs smooth anywhere after 1k). I'm not sure if this issue is related or just something else that happened to come up at the same time. Going to start checking for vacuum leaks now.
I would keep checking for bad wires. Jeep XJ have dogsh!t for wiring and make 50yr old Lucas look like space age
The bad news is that I still have a little bit of a rough idle that gets really rough if I give it a little gas right at 1k rpms (runs smooth anywhere after 1k). I'm not sure if this issue is related or just something else that happened to come up at the same time. Going to start checking for vacuum leaks now.
Try disconnecting the injectors or plugs again to see if you can isolate it.
And to do injectors you need an attenuator. They're pretty cheap, and I suppose you could get 6 and look at all of the injectors at once. But one is fine, just go down the line.
A Cherokee injector waveform:
Interesting that you mention an attenuator is needed for the Injectors, what is the maximum voltage of that spike ?
I'm sure there is others who would appreciate being schooled up a little
09-05-2019, 06:35 AM
