ericlexius

Hey guys, I have a 97 z28. It recently started throwing a p1351 code. Here is a little history of the car. I bought it almost a year ago not running, it needed an opti. I put an opti on it, new plugs, and wires. Once I got it running it began throwing a p0300 and occasionally a p0303 code. About a month later it began throwing some other code, ( can't remember what it was) and it would die on me, sometimes while driving and sometimes while just sitting idling. The code that it was throwing led me to believe it was an opti spark issue so I swapped it out for another new one under warranty. I have had no problems with the car since installing that opti, however I do keep getting the p0300 and the p0303 codes. The car seems to run fine even with these codes. Check engine light has been on for a couple of weeks now so a couple of days ago I pulled the codes certain I would only have my 300 and 303 codes. This time I also had a p1351 code, keep in mind the car has been running fine and not dying on me. Yesterday I was messing around under the hood and actually found a vacuum leak on my #3 injector, fixed that and have been driving around a bit and so far, no 300 or 303 code! Yeah!!

So, everything I've been seeing about this p1351 code is people are saying engine dies, runs rich, runs rough...all kinds of stuff, I am not experiencing anything like that. Anybody got any ideas for me to try? I guess what is really throwing me is that I'm not experiencing any problems with drivability.

ericlexius

can someone tell me how to troubleshoot this p1351?

Crf450r420

iTrader: (1)

Try searching or asking in the "4th Gen F body Tech" facebook page. I've seen a lot of people get tons of answers fast about the Unopti spark system. I've never once had to deal with it and hope I never do.

Spartan7

iTrader: (7)

P1351 is "IC Circuit High Voltage". IC is ignition coil. The code is set when ignition voltage to the coil spikes over 4.5v DC while cranking. You'll need to disconnect the connector from the coil, and use a multimeter to check voltage on pin B while cranking. It should be between 1 and 4v.

If it's too high, it's possibly the ICM or that wire between the ICM and coil.