Search the Community

Hey guys, I know the title doesn't make much sense but to keep it short I received my 1991 cefiro rb26 swapped and it had a Prius battery. I'm assuming this was so the dealer didn't have to swap terminals but the car would have random times where it didn't want to start. Prius battery CCA's are not in spec so I decided to change the battery to a 51RPLT. I used what the parts store had and the list of battery's wasn't available. I am under the impression that it shouldn't matter. However after I started it with this battery a dull knock had started. I drove it a short distance and it would go away with revs but come back at idle. I did notice the idle rpm is ~1100 before the battery change it was at ~900. Obviously there's alot to support the battery change as the issue. Would there be anything else that would cause this? Deeper information Engine was swapped 6k km ago. R32 26 stripped the oil pump so I'm pretty familiar with metal on metal noise. R33 26 is in now, has been good for the 6k kms with the other battery. Spark plugs, water pump, oil pump, hks timing belt, theremostat all changed with the r33 engine. Supposed to have around 40k km on it. No shavings in the oil, oil level good doesn't burn any, temps are always cool. We did have a stint with bad coil packs idk if the ones we swapped were good but our problem with miss fires did go away. It's had 3 oil changes only with oem filters. I was so worried about doing everything right seems I may have still not done enough. Pretty heartbreaking. Ecu appears to be a stock 26 ecu. Car does pop a flame every once in a while but I equated that to the aftermarket exhaust. I am gonna try and get the Prius battery again but idk if I can trust another RB if the bottom end is out. Just alittle too convenient that it came with the battery change. Gonna check spark plugs and ohm read coil packs and lastly a compression test if all else fails. Any ideas or trouble shooting I can do would help.