I’m presently stuck at my office, and not sure what to check on Superblue (my '94 4.0 coupe).
Earlier tonight, I decided to finally try to wash off all that engine oil that had accumulated in the recent past due to the backend of the valve cover gasket being blown, prior to my r/ring same a couple of weeks ago. I followed the directions on the Gunk cleaner can by letting her cool a bit at the car wash, then spraying everything down in the compartment, letting that soak for about 10 minutes +, then rinsing everything off with the wand, using the fine (weak) spray final segment of the wash cycle only. After waiting a few minutes, I started her up and everything seemed fine. As directed (and from my previous experience with my XJ40s) I made sure to drive her around for over 1/2 hour with the engine fully warmed up before shutting her off, to make sure everything dried out in there (there was a little pooling of water around 4 or 5 of the plug boots, but since the boots were tight in the plug holes, nothing leaked in, apparently). Again, everything was fine, and I parked her at my office.
A few hours later, I go to start Superblue up and she’s missing badly, like she’s only firing on 3 or 4 cylinders, and will hardly idle. I checked everything visually under the hood, and everything there appears dry. Just last week I had installed new plugs and new plugs wires, including the coil hood, so I can’t imagine water getting in anywhere there and fouling things up I haven’t had a chance yet to replace the dist cap and rotor, so could water have gotten in there somehow, although everything seems tight with that?
Give it a few more hours and will whatever is fouled clear up, or do I need to call a tow truck now and expect another trip to the shop this week?