Miss / Sputter Under Boost
Moderators: P3g4sus, Daniel, rat, Draco, Riekert
Miss / Sputter Under Boost
Hi Guys,
There is a constant miss / Sputter under boost.
What could this be??? Any Settings???
Or perhaps faulty coilpacks???
There is a constant miss / Sputter under boost.
What could this be??? Any Settings???
Or perhaps faulty coilpacks???
Could be one of many things:
- boost leak
- spark plugs
- coil packs
- AFM
Is your car standard? Or what has been done to it?
Check for any obvious things in the engine bay such as pipe splits/disconnected pipes. Clean the AFM with carb cleaner spray, check the spark plugs and clean/replace if necessary.
- boost leak
- spark plugs
- coil packs
- AFM
Is your car standard? Or what has been done to it?
Check for any obvious things in the engine bay such as pipe splits/disconnected pipes. Clean the AFM with carb cleaner spray, check the spark plugs and clean/replace if necessary.
Miss
Thanks guys,
I have replaced plugs with a set of BCP7ES.
I have cleaned AFM with carb cleaner.
Boost is steady 0.4 bar.
I did fiddle with TPS. Could this be the cause?
Also fiddled with CAS, trying to set timing, but timing marks not visible on Crank pulley (pully damaged on edges).
Also overfuelling : dumping fuel (''mini-explosions'' in exhaust on deceleration).
Idle is at +/- 1000rpm (i picked up idle because car was cutting off intermittently (on idle only) when at stop streets.
Motor was completely rebuilt about 1000km ago.
Added a Walbro 255lph fuel pump 2 weeks ago.
t25g Turbo (off SR20DET) with t25 actuator.
I have replaced plugs with a set of BCP7ES.
I have cleaned AFM with carb cleaner.
Boost is steady 0.4 bar.
I did fiddle with TPS. Could this be the cause?
Also fiddled with CAS, trying to set timing, but timing marks not visible on Crank pulley (pully damaged on edges).
Also overfuelling : dumping fuel (''mini-explosions'' in exhaust on deceleration).
Idle is at +/- 1000rpm (i picked up idle because car was cutting off intermittently (on idle only) when at stop streets.
Motor was completely rebuilt about 1000km ago.
Added a Walbro 255lph fuel pump 2 weeks ago.
t25g Turbo (off SR20DET) with t25 actuator.
- P3g4sus
- Club Drifter
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- Joined: Wed Mar 03, 2010 12:23 pm
- Car: Supra
- Engine: 2JZ
- Real Name: B.G. Smit
- Location: Midrand
Re: Miss
What about Poizen?Fastlane wrote:Okay cool, will do.
Want to take it to Gary, but he's a bit of a distance away from me, so have to arrange to have car dropped off with him.
And chec your plug gaps
Power is nothing without control,
Control is not fun without power.
Traction is over rated.
Control is not fun without power.
Traction is over rated.
Miss
Ja, Poizen is much further away.
Car did have a Dastek Unichip before the previous motor fried, but got rid of it.
I wonder if the mechanic connected all the wires back to the ecu properly?!?
I heard that std boost is 0.5 bar?!? Anyways I am using a t25g with t25 actuator. What should my boost then read?
Strangely, I have noticed that the car idles fine (actually quite smoothly) when I first start it. Only after driving it (obviously placing it under load) does it start its nonsense.
Also suspecting the eight port head having something to do with it. Maybe ''butterfly flaps'' not open enough.
What about sticky valves (or too deeply seated valves) ? What would the symptoms be?
Car did have a Dastek Unichip before the previous motor fried, but got rid of it.
I wonder if the mechanic connected all the wires back to the ecu properly?!?
I heard that std boost is 0.5 bar?!? Anyways I am using a t25g with t25 actuator. What should my boost then read?
Strangely, I have noticed that the car idles fine (actually quite smoothly) when I first start it. Only after driving it (obviously placing it under load) does it start its nonsense.
Also suspecting the eight port head having something to do with it. Maybe ''butterfly flaps'' not open enough.
What about sticky valves (or too deeply seated valves) ? What would the symptoms be?