So I finished my EJ22 swap into my '92 Loyale, and hit the road. Thankfully for me, I'm on my way back... Just have to say, for a motor that had 230k miles, power is great. But I think the rings are bad, being that I'm having to replace oil if I travel at rpm's above 3k...
But, my DILEMA! While driving at sustained interstate speeds, there is an intermittent popping/thudding coming from the floor near the gas pedal and the passenger's left foot. You can hear it, and if you put your hand as far up under the dash by the gas pedal, and also by the passenger's left foot.. You can feel the thumping. It feels like something his flapping around and hitting the shell of the car...
I have already gotten under it. There's nothing hanging/loose. I started trying to move everything/anything I could get my hands on. Everything feels fine. Nothing wiggly/jiggly.
The noise reminds me of the first few corn kernels that start to pop when making your own popcorn. Just kinda sporadic.
The vehicle is performing well. No error codes. Fuel economy is in the low 30's right now. No problem accelerating up a hill, All gears work, although I think that the synchronizing gear for third is beginning to ware.
I've been trying to trigger/kill the sound. I hear it after sustaining speeds, then if I downshift it'll stay through each gear until I'm about ready to come to a complete stop/put transmission in neutral. I tried taking it out of gear and coasting for a while. Makes it go away for about ten-20 minutes of high speed . BUT, at the same time, I experimented with a coast-to-stop as soon as I heard it next. Well I kept it in neutral, and revved it up and down while coasting. The sound/thump/pop would start and fade.
Doesn't happen in City traffic.
Also noticed that my speedometer has to catch up sometimes while hitting interstate speeds..
I was wondering if the coolant lines could be popping? I feel like it's in the same area as the heater core as well? Could there be an air bubble in the system? I've had to replace about 3oz of coolant every so often since putting the motor in. No white smoke.
Any advice or help would be greatly appreciated.