Intermittent no power below 3000rpm
#1
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Join Date: Dec 2006
Location: Toronto, Canada
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Intermittent no power below 3000rpm
Having some problems with how the Miata is running and looking for thoughts on where to look for the problem...
Quick background on the car:
97 Miata
WRX turbo
550 injectors
MSPNP
This problem is intermittent, it comes and goes with no apparent pattern or trigger. Sometimes the car runs fine all day and other times, all of a sudden it loses most of its power. When the car is running well, the engine revs freely when you press the gas. Pulling away from a stop there is good power. When the car is running poorly, the engine is sluggish to rev below about 3000rpm when you press the gas. Pulling away from a stop, there is no power. The car can barely accelerate itself and it will be making 5psi or so of boost to do this.
When things are good, at idle:
Idle vac: 20inhg
Engine RPM: 1050rpm
Wideband reading: 13:1
When not running well at idle:
Idle vac: 8-10inhg
Engine RPM: 850rpm
Wideband reading: 10.5:1
Any thoughts on where to look for a problem or things to test??
thanks
Quick background on the car:
97 Miata
WRX turbo
550 injectors
MSPNP
This problem is intermittent, it comes and goes with no apparent pattern or trigger. Sometimes the car runs fine all day and other times, all of a sudden it loses most of its power. When the car is running well, the engine revs freely when you press the gas. Pulling away from a stop there is good power. When the car is running poorly, the engine is sluggish to rev below about 3000rpm when you press the gas. Pulling away from a stop, there is no power. The car can barely accelerate itself and it will be making 5psi or so of boost to do this.
When things are good, at idle:
Idle vac: 20inhg
Engine RPM: 1050rpm
Wideband reading: 13:1
When not running well at idle:
Idle vac: 8-10inhg
Engine RPM: 850rpm
Wideband reading: 10.5:1
Any thoughts on where to look for a problem or things to test??
thanks
#4
Junior Member
Thread Starter
iTrader: (1)
Join Date: Dec 2006
Location: Toronto, Canada
Posts: 72
Total Cats: 0
I took a data log the other day, will upload it tomorrow.
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