andy.262
Active Member
I have a 97 GTI that I just finished rebuilding, I'm on my second tank of gas since the rebuild, so thats the "ride as normal except dont hold it wide open for more than 5 seconds" stage. It starts and idles totally fine, and runs great up to like 25% throttle (no tach, can't tell RPMs), but when I try to accelerate more from 25% I'm seeing that sometimes it does it just fine, and sometimes it feels like a misfire and will stick at that same RPM without increasing for a few seconds at which point it will sometimes continue accelerating or sometimes drop RPMs but not stall. It's somewhat rideable still, never stalls, it's just not quite right on the acceleration.
I don't think its a fuel issue - fuel selector and lines are new, carb freshly rebuily with Mikuni parts according to carb wiki. To me it FEELS like a misfire, kind of feels and sounds like on my 2-stroke sled when it has a bad spark plug and is running on 2/3 cylinders. However, it only happens at high-ish RPMs and only in the water, on the trailer it revs right up just fine every time. Replaced spark plugs, no change.
So, I am now suspecting a weak but still present spark in 1 cylinder maybe? So, either ignition coil or bad plug caps or wires? Anything I can do to test those without buying parts?
I don't think its a fuel issue - fuel selector and lines are new, carb freshly rebuily with Mikuni parts according to carb wiki. To me it FEELS like a misfire, kind of feels and sounds like on my 2-stroke sled when it has a bad spark plug and is running on 2/3 cylinders. However, it only happens at high-ish RPMs and only in the water, on the trailer it revs right up just fine every time. Replaced spark plugs, no change.
So, I am now suspecting a weak but still present spark in 1 cylinder maybe? So, either ignition coil or bad plug caps or wires? Anything I can do to test those without buying parts?
