Part throttle hesitation off boost.
12-23-2016, 09:36 PM
#1
Drifting
Thread Starter
Part throttle hesitation off boost.
I have a part throttle flat spot. 06Z with eforce.
At light throttle openings such as when looking for a little power in the low rev range without kicking in boost from the eaton. less than 0 vacuum. Only occurs when not delivering boost. As I roll in it happens and then surge back to power as I reduce throttle. AFR also goes up to 17or 18 but is changing constantly since it it more a transitional throttle opening.
If I crack the throttle more and hit boost it goes away like a light switch and AFR goes to 12 down to 11+/- as it ought to be.
I see it is worse when the engine is cooler but by no means cold. I own a tech2 clone, hp tuners and trinity for scanning etc.
Any suggestions where to start looking?
At light throttle openings such as when looking for a little power in the low rev range without kicking in boost from the eaton. less than 0 vacuum. Only occurs when not delivering boost. As I roll in it happens and then surge back to power as I reduce throttle. AFR also goes up to 17or 18 but is changing constantly since it it more a transitional throttle opening.
If I crack the throttle more and hit boost it goes away like a light switch and AFR goes to 12 down to 11+/- as it ought to be.
I see it is worse when the engine is cooler but by no means cold. I own a tech2 clone, hp tuners and trinity for scanning etc.
Any suggestions where to start looking?
Last edited by speedz06; 12-24-2016 at 11:12 AM. Reason: shorten the story.
12-25-2016, 01:26 AM
#2
Safety Car
I have a part throttle flat spot. 06Z with eforce.
At light throttle openings such as when looking for a little power in the low rev range without kicking in boost from the eaton. less than 0 vacuum. Only occurs when not delivering boost. As I roll in it happens and then surge back to power as I reduce throttle. AFR also goes up to 17or 18 but is changing constantly since it it more a transitional throttle opening.
If I crack the throttle more and hit boost it goes away like a light switch and AFR goes to 12 down to 11+/- as it ought to be.
I see it is worse when the engine is cooler but by no means cold. I own a tech2 clone, hp tuners and trinity for scanning etc.
Any suggestions where to start looking?
At light throttle openings such as when looking for a little power in the low rev range without kicking in boost from the eaton. less than 0 vacuum. Only occurs when not delivering boost. As I roll in it happens and then surge back to power as I reduce throttle. AFR also goes up to 17or 18 but is changing constantly since it it more a transitional throttle opening.
If I crack the throttle more and hit boost it goes away like a light switch and AFR goes to 12 down to 11+/- as it ought to be.
I see it is worse when the engine is cooler but by no means cold. I own a tech2 clone, hp tuners and trinity for scanning etc.
Any suggestions where to start looking?
Also make sure your fueling is good (maf and/or ve) in the ranges where it's happening.
Last edited by sevinn; 12-25-2016 at 01:27 AM.
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speedz06 (12-25-2016)