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Discussion Starter · #1 ·
Alright, ive tried searching this forum and beyond but cant find a solution so maybe you guys can help me.
I know i cant be the only SHO owner to come across the problem.


The just of it is that my engine is bogging down when i hit 4-4200Rpm
I seem to be able to bypass this if i ease on the throttle.

I did find that thee secondary set of butterfly's on the intakes open around 4K Rpm. SO im guessing thats were im running into problems.

Either They are not opening. not fully opening, not opening fast enough?
Getting caught under vacuum pressure when throttle is opened?
or whatever there doing. there not doing it right.

Does this all sound familiar?
My plan is to take it all apart and do my best to rebuild it.
Check all vacuum line...etc

What do you guys think?
 

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My guess would be that the secondaries are not opening. Which is easy to check. If they are opening then I would pull codes.
 

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Discussion Starter · #5 ·
Does the same thing with the MAF unplugged or plugged in

Im not getting any cods either

Where is the fuel filter located?
 

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Discussion Starter · #6 ·
Update.

Kinda seems more likely to bog out at any RPM now.

Could be the cats?
punch it out and ill find out haha

im going to once over the vacuum lines.
 

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Discussion Starter · #7 ·
still have this problem, if anyone can give me more input or info?

Today I :
Pulled the intake off
placed all vacuum lines
rebuilt the ICV
Cleaned TB
checked over everything!

my next guess is the TPS is going haywire
pull it off and check the contacts

If thats not it then Fuel pump and cats are next on the list
 

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Even if you don't have the check engine light you can still have codes.I would still pull them with a paper clip.

Fuel filter is located below the passenger door by the wheel well.

I don't know about rebuilding the IAB but if it fails it might be good to replace it as it does cause idling issues.

Could be that the DIS is on its way out.
 
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