Labcoatguy
Forum Addict
- Joined
- Mar 27, 2005
- Messages
- 14,182
- Location
- New England region, USA
- Car(s)
- #Jaguar #XKR #XJR, #Saab #9-3 #9-5 #900
Posted this on the Spyderchat forums too, but figured worth a shot here if there's any secret Toyota tuning experts around.
Situation: 1988 Mk1 MR2 with a 2ZZ swap from previous owner, has been running fine for about two years, kicking into lift like whoa as expected. All stock electronics with the factory Denso MAF in the intake piping and an O2 sensor installed after the header merge.
This summer, it started to seriously lose power and bog down on hot days, occasionally even stalling when stopped. Here's what I did next:
I wonder if the ECU just needs to cycle a few times before letting itself get above 5k again. Anyone know what might be behind this?
Situation: 1988 Mk1 MR2 with a 2ZZ swap from previous owner, has been running fine for about two years, kicking into lift like whoa as expected. All stock electronics with the factory Denso MAF in the intake piping and an O2 sensor installed after the header merge.
This summer, it started to seriously lose power and bog down on hot days, occasionally even stalling when stopped. Here's what I did next:
- Suspected knocking, added octane booster to the next fillup and cleaned the MAF with MAF cleaner spray, and after putting it back in, that's when it stopped revving above 5k as if a rev limiter kicked in at that RPM.
- Later found that the MAF mount had separated from the intake tube (JB weld failure), fixed that, but not before panic-buying a new MAF sensor and crank position sensor.
- Installed them, still wouldn't rev above 5k, and got P0171 P0325 codes (might've been left over from beforehand).
- Disconnected the battery to clear codes, went out for another drive, doesn't bog down as much but still can't rev above 5k.
- Read the codes again and the only thing that came up was an evap system code, which I'd expect, as the guy's swap didn't include that.
I wonder if the ECU just needs to cycle a few times before letting itself get above 5k again. Anyone know what might be behind this?