Hi everyone, here's today's puzzler:
I've got a lovely 2008 RX-8 40th Anniversary Edition with around 24,000 on the clock (bought it with 18,000) and today it ran into its first serious issue. After a short warm-up, as I was accelerating hard to highway speed (past 8,000 RPM), the engine lost power and revs, threw a CEL and began oscillating near 3,000 RPM, almost as if it was hitting a rev limiter. When I depressed the gas pedal, I got no response, so I was forced to stop on the shoulder where the behavior continued:
I shut off the engine, and the car cranked but wouldn't start. It started on the second attempt with the engine idling high, and I tried driving it but only made it a few yards before it began to lose power. I stopped again and plugged in my OBD bluetooth scanner to pull the CEL codes. I got "P0638 - Powertrain: Throttle Actuator Control Range/Performance (Bank 1)," and "P0116 - Powertrain: Engine Temperature Circuit Range/Performance Problem."
I hoped it was an electrical bug of some sort, and not wanting to be stuck on the side of the highway, I popped the hood and pulled the negative terminal for the battery and reattached it. Car started up fine and I drove the 3 miles home without further incident. Notably, the CEL was gone.
History:
Previously, only once I think, I noticed the car bog down and lose revs, but it only happened once (no CEL) and hasn't repeated itself for months until now. I also had a problem right after I installed my SOHN adapter where turning the key would instantly kill ALL electronics (as if the battery had been disconnected) but opening/shutting the car door a couple of times brought everything back and the car started just fine... I assumed it was a loose battery ground from my recent work so I tightened the negative terminal and the problem did not repeat. Could it be related? The car starts 95/100 times on the first time without issue, hot or cold, and I haven't really had any trouble with it until now.
Major modifications on the car:
I installed a SOHN adapter about 400 miles ago.
AEM cold air intake (replaced previous owner's K&N)
TurboXS catback exhaust
Recent Service:
Oil changed 400 miles ago
Coolant drained/flushed 400 miles ago
Replaced coolant overflow tank for bad sensor 400 miles ago
New plugs, coils & wires 4,000 miles ago
So, any ideas where I should start? This is my daily driver and thus I need it to be drivable. Thanks in advance :)
I've got a lovely 2008 RX-8 40th Anniversary Edition with around 24,000 on the clock (bought it with 18,000) and today it ran into its first serious issue. After a short warm-up, as I was accelerating hard to highway speed (past 8,000 RPM), the engine lost power and revs, threw a CEL and began oscillating near 3,000 RPM, almost as if it was hitting a rev limiter. When I depressed the gas pedal, I got no response, so I was forced to stop on the shoulder where the behavior continued:
I shut off the engine, and the car cranked but wouldn't start. It started on the second attempt with the engine idling high, and I tried driving it but only made it a few yards before it began to lose power. I stopped again and plugged in my OBD bluetooth scanner to pull the CEL codes. I got "P0638 - Powertrain: Throttle Actuator Control Range/Performance (Bank 1)," and "P0116 - Powertrain: Engine Temperature Circuit Range/Performance Problem."
I hoped it was an electrical bug of some sort, and not wanting to be stuck on the side of the highway, I popped the hood and pulled the negative terminal for the battery and reattached it. Car started up fine and I drove the 3 miles home without further incident. Notably, the CEL was gone.
History:
Previously, only once I think, I noticed the car bog down and lose revs, but it only happened once (no CEL) and hasn't repeated itself for months until now. I also had a problem right after I installed my SOHN adapter where turning the key would instantly kill ALL electronics (as if the battery had been disconnected) but opening/shutting the car door a couple of times brought everything back and the car started just fine... I assumed it was a loose battery ground from my recent work so I tightened the negative terminal and the problem did not repeat. Could it be related? The car starts 95/100 times on the first time without issue, hot or cold, and I haven't really had any trouble with it until now.
Major modifications on the car:
I installed a SOHN adapter about 400 miles ago.
AEM cold air intake (replaced previous owner's K&N)
TurboXS catback exhaust
Recent Service:
Oil changed 400 miles ago
Coolant drained/flushed 400 miles ago
Replaced coolant overflow tank for bad sensor 400 miles ago
New plugs, coils & wires 4,000 miles ago
So, any ideas where I should start? This is my daily driver and thus I need it to be drivable. Thanks in advance :)
Help Diagnosing Throttle/Starting/Electrical Issue
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