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2G Engine Bogs

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PIGNOSE

Probationary Member
13
0
Apr 22, 2018
Queretaro, Central_America
Hello
My stock 2G GST does not pull hard after 4500rpm in all the gears, the engine feels like its running without any boost after this rpm
but... the problem doesn't appear while the car is in neutral at WOT

I've recently replaced:
-spark plugs cables
-spark plugs
-knock sensor
-gasoline filter

the car is running at 10psi
i've checked for boost leaks and cleaned the injectors


thank you for reading

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Last edited:
Do a compression test on the engine. Any check engine lights?

i did a compression test when i bought the car, the results were 120psi all across
yes the check light engine is on
went to autozone and pulled out one code p0130

you think the oxygen sensor is the cause?
 
i just replaced the oxygen sensor and erased the code

the problem still there

any other ideas???

btw im getting great gas milage now..
 
You said you replaced the spark plugs. What Brand plugs did you put in?
 
Factory is .028.
I run mine much tighter but under much more boost.
 
try dropping that gap down to .26-.28, might not be the issue but this has happened to my gst before she doesn't like .30

done
thanks bro




yes sir, two times just to make sure


The T25 sucks but it shouldn't fall at 4500, more like 5500

The T25 minimum boost off the wastegate actuator is 12psi. So you have a boost leak or the wastegate actuator is messed up

boost doesn't creep or drop at 4500rpm or after
 
How's the basic maintenance? is base timing set? any CEL flashing from 4500 on? fuel pump still good? FPR still good? fuel filter good?

As far a basic maintenance all filters, liquids and plugs have been replaced. Checked the base timing and all marks line up.

I also checked the FPR with a vacuum gun and hooked up a fuel pressure gauge to the fuel line, everything looks in range on idle and under boost (boost is set a 10psi)

I don't now what CEL flashing is...

the problem persist
 
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