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At this point the only thing I know for certain is it quits doing it when I start messing with the fuel rail. Either by testing pressure or unplugging/replugging injectors.

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Oh, and right now fuel pressure readings are all dead on what they should be.

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Ok, so wife just got home with the fuel pressure tester. I hook it up, turn the key to just crank it and see what the pressure is cranking, and it just starts right up without having to hold the...

Ok, just did that, and nothing changed.

Here's another video from a different perspective. If you watch my foot and the tach, you can see the cough and then rev. So it's not just of idle. ...

Sorry, I'll do that. It's a '91, 4.0 with 5 speed.

I'll rent a tester at the parts store later today and check it again.

And thanks for helping out! I am getting so frustrated with this...

Stock injectors as far as I know, (I've never changed them, and I know the previous owner wouldn't have) and when I checked the pressure I August it was all exactly what the specs say it should be....

I'm back! So, it's been running fine since August. Just started doing it again.

Takes full throttle to start it, and then it sputters and coughs for several seconds and pumps black smoke...

Probably sick of this thread popping up by now! [emoji16]

It started doing the same thing again. I pulled all the plus and they all had black soot coating them indicating a rich condition. ...

Well, it drove around all day today just fine. [emoji53]

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Maybe I should hook it up again and let it flow and see if the bubbles keep coming. At the time I wasn't paying super close attention as I wasn't trying to accomplish anything. It was more like it...

I'm not sure. There were bubbles, but I'm not sure if that was from the fuel rail, or the tester line.

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Well, I have bypassed the fuel pump relay and the resistor with no change.

I have verified that the system is working as designed, i.e. fuel pump runs about 2 seconds when key is turned on and...

Ok, neither the TPS nor MAP made any difference at all.

I was thinking maybe the idle air valve, but that shouldn't affect it after it's off idle though, right? And I unplugged it and it wouldn't...

Ok, finally got a day off and I'm messing with the XJ. So still will not start without throttle to the floor, warm or cold. Once started runs really rough at first and seems very rich. Like it was...

Ok, thanks. I'll take a look for it as soon as I can get some time. I would think it would just quit as well.

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It's a '91

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Well, after two months it's started again. We checked codes, and it's showing a code 76. The chart I found says: "Fuel pump bypass relay circuit. Need specialist or dealer diagnostics"

When...

Very strange. Been driving it a lot and nothing. Running like a top! Hard to diagnose when it won't do it again! If it comes back I'll update with what it turns out to be.

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Well, went out this morning to start trouble shooting it, and it fired right up and ran perfect. Went and drove it to town and no issues. So far it's driven 20 miles with starts and stops, and not...

There was no light on, but I guess it's possible it doesn't work. I'll go by the parts store and check for codes.

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Had an issue pop up today with the XJ. It's a '91 with 4.0 and 5 speed. It's pouring rain so hard I haven't been able to do anything with it yet. But I figured while I wait I might as well seek...

I'm slowly converting my shop to those to. Well, basically the same thing from Lowe's. As bulbs or ballasts burn out I'm not replacing them. Just swapping out to these. I love that they don't...

I picked up my Hypertherm PM45 used for $1200, and it was only 3 months old. If you plan to use one a lot, I would really go with Hypertherm because of consumable life. I use mine on a CNC table,...

The ladder style is ok for saving your drivetrain components, but they tend to get hung up on rocks rather than slide over them. Just imagine dragging a ladder over over a boulder vs dragging a 2x6...

Yes, that was FPV filming.