I picked up a cherry 1997 Infiniti J30 with 68k miles last week. The first few days she ran like a champ. On Thursday I went to start her and she cranked up like normal, ran for 2-3 seconds, sputtered and died and then wouldn't start again. Cranked fine but wouldn't fire up. Tried the next day, same thing. Giving it some gas didn't help stop the car from dying or in starting the car. There was no CEL.
I scanned her a few minutes ago and found a P0325. For kicks and giggles tried starting again. She cranked up with a little finesse on the throttle but idled somewhat rough. Interestingly, turning the AC on seemed to make her run a little smoother and bring the idle up a little bit (just shy of 1k, w/o AC more like 700-800). Took her around the block and I feel like she was a little sluggish. But it's a new car to me and my daily has much more power so take that with a grain of salt.
FWIW, I do think the car was sitting for a while. I put a fresh tank of gas in immediately after the purchase. Only issue flagged on the PPI was leaking valve covers, which in my book is just old car stuff.
I've read the P0325 is rarely actually the knock sensor, it just tends to throw that with other codes or with misfires. Can anyone speculate as to what might be going on? Going in for diagnosis and timing belt next week, so hoping to have some ideas before they get back to me with their diagnosis. Also kind of hoping a fuel filter and can of seafoam may fix it...
Which leads me to a slightly tangential question. Is there any good way to get the fuel filter off? I was struggling with the lines being basically fused on for near 30 minutes before calling it.