1990 4WD Mighty Max!

[OR3X]

Thanks Xbox! Appreciate the advice on where to look!

[xboxrox]

Thanks Xbox! Appreciate the advice on where to look!

You are more than welcome OR3X please post the outcome to your fix & best of luck.

[OR3X]

You are more than welcome OR3X please post the outcome to your fix & best of luck.

Ok, so I've done a bunch of troubleshooting and I tried to post updates a couple times but for some reason it wasn't working. Anyways, here's what I've done so far:

• Identified cylinder 3 as misfiring cylinder by pulling plug wires from dist cap one by one and listening for change in engine
• swapped plug wire on cylinder with used spare - no change
• swapped plugs between cylinder 3 and 5 - misfire stayed at cylinder 3
• pulled plug three and checked spark. - strong spark observed
• tested coil - 1.0Ohm on Primary and 12.3k Ohm on secondary - appears good
• checked injector by listening then unplugging electrical connector and comparing against others - sounds like it's working

I think my next move at this point is to do a compression test on the cylinder and see how it compares to the working ones. There is a quite noticeable tick on that bank of the engine so it could be valve-related. I really want to swap injectors between 3 & 5 to make damn sure it's not an issue with a weak injector or something like that, but just by looking it appears I will need to remove the intake at the very least to get the injectors out. All the plastic and rubber in the engine bay is INCREDIBLY brittle, so I don't want to start taking things apart unless I absolutely have to because I'm certain things are going to start breaking as I take it apart.

Any other ideas?