Joined
·
425 Posts
I picked up a completely stock 06 non-sport (US, 2ZZ) Elise a couple months ago. The short version of my problem is _absurdly_ bad hesitation at low RPMs (below 2500-3000) when cold, which falls back to just _very_ bad low RPM hesitation once it's warm. When the car is cold, I could go WOT at ~1500 RPMs in first and have it take several seconds to slowly accelerate up to 3000 RPMs. Once it's warm, it's better, but you can still feel a huge torque dip (probably 1/4-1/3 the torque) below ~2500. It makes it annoying to pull out of a stop/etc. Looking at dyno plots of stock cars that go down to 2k and a hair below, it looks like it's still making quite good torque down there normally, so it seems like something's wrong.
Once the car's moving and above that it feels basically fine (maybe slightly slower than my old Elise, but it's been years so it's hard to calibrate my butt dyno).
I have an OBD2 scanner, and there's no codes being thrown of any sort. From reading some other threads tonight from supercharged guys, everyone seems to suggest changing the pre-cat O2 sensor. I'm wondering if that's just an SC issue or any-car problem. Anything else to suggest while I go diving? Checking the air filter and plugs are easy enough, and I even have some coils off my Miata (I'm using the 1ZZ coils, which I assume are the same?) that I could try swapping in if it's they're the same to see if that helps. Given that it runs fine up top and it's just crappy down low makes me more doubtful that it's ignition-related, though, but I've been wrong a pile of times before.
Any thoughts? Later this year I'm going to be doing some serious mods and I'd like to get the car running in top shape before I go down that path, so this is the beginning of my fun...
Once the car's moving and above that it feels basically fine (maybe slightly slower than my old Elise, but it's been years so it's hard to calibrate my butt dyno).
I have an OBD2 scanner, and there's no codes being thrown of any sort. From reading some other threads tonight from supercharged guys, everyone seems to suggest changing the pre-cat O2 sensor. I'm wondering if that's just an SC issue or any-car problem. Anything else to suggest while I go diving? Checking the air filter and plugs are easy enough, and I even have some coils off my Miata (I'm using the 1ZZ coils, which I assume are the same?) that I could try swapping in if it's they're the same to see if that helps. Given that it runs fine up top and it's just crappy down low makes me more doubtful that it's ignition-related, though, but I've been wrong a pile of times before.
Any thoughts? Later this year I'm going to be doing some serious mods and I'd like to get the car running in top shape before I go down that path, so this is the beginning of my fun...