Clogged Injector #1 twice?!?!

[4cefed]

Hey, here's a good one. I did a search and all I found was this thread which didn't answer anything

zerothread?id=84659

So I blew the engine in my '92 KA24 a few years ago. I bought a '91 for the engine and parts. The blown engine has been attributed to loosing all the oil. (long story) My swap ran (with about 150k mi) great for about 3k mi. The valve cover gasket is leaking oil into the spark plug wells, so I redid it. It still leaks a bit into the #1 plug well. When it started running on 3 cyl I immediately suspected shorted ignition. I played with it for an hour and concluded the plug was firing just fine despite the oil.

So engines need air spark and fuel, I can only assume cyl #1 is getting air, it seems to be getting spark, and the other 3 are firing, so bad injector? I pulled it and looked at the connections, no green death so I swapped an injector with the blown engine. (the '92) This ran fine after a few seconds so I figured it was fixed. The old injector seemed to be pulsing, so I can only assume it was clogged. I wanted to change the fuel filter before I ran it again, but I got busy and it sat for a couple weeks.

Feeling withdrawal, I drove it a half hour away and back. About 2 miles away from home (and halfway thought a really nice drift) I lost a cyl again. #1 wasn't firing when I got back. I checked and cleaned the plug and the plug well again and still nothing. I replaced the fuel filter this time and swapped in another injector. It seems fine now.

Anyone had this happen? What are the odds I would clog the same injector? I haven't looked at the fuel rail closely to see the flow of the fuel coming and leaving, but is something else causing a clogged injector? If this was one of my Dodges I would just assume this sort of thing was normal, but not my 240.

[180fan]

how long was it before you replaced that fuel filter? another thing is to check out the sock on the fuel pump itself.

[4cefed]

I replaced the fuel filter when I did the engine swap. So it only had about 1500 miles on it max. When I removed it, the gas coming back out looked a little cloudy, at night, with a flashlight. I was going to take it apart and see if the element failed.

Could it be an injector harness ground problem? I've been reading all over the tech section and I think I've heard that mentioned a few times. I never tested the second "bad" injector to see if it was pulsing. I'll check that and maybe the sock tomorrow.

If the pump was failing are there any tells with these cars?

Thanks for the reply btw.

[180fan]

fuel pressure gauge and something to generate a vacuum.

did you ever change the fuel pump either? Although it wouldn't cause a fuel injector to fail twice. It's possible that it could be an injector, or an ecu, or the wiring to the ecu.