Editing Forums/Z31P/z31-repairs-forums engine-mechanical/Slight Hesitation

{{ForumImport
|op_user=TearingRaven
|op_date=2008-05-12 09:40:06
|post_count=4
|archive_url=/Z31performance_archive/forum/z31-repairs-forums/engine-mechanical/4884-slight-hesitation.html
}}

'''TearingRaven:''' <small>(2008-05-12 09:40:06)</small>

This is an issue that has been nipping at me. If I give the throttle a good pump, my engine will hesitate less than a second before revving up. Its very short lived but its certainly there. If I slowly get on the throttle, everything is normal, so it only occurs when I pump it. I checked my codes and got 21 (Coil wtf?) and when I rechecked them, I got a 44 code. Any ideas or suggestions would be greatly appreciated!

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'''1SIKZ31:''' <small>(2008-05-12 12:07:06)</small>

This has been an on-going problem with Z31's from MY EXPERIENCE.

My Z31 did this, my friends did, and my other friends did.

I personally came to the conclusion that its because of the stock AFM Placement. I think that because it has to draw air through the charge pipe and through the compressor housing as well as against a ALMOST stalled compressor wheel causes the "delay".

BUT I also think im IN-correct because my friends VG34 Z31 does not do this, it is INSTANT throttle response without that hesistation you speak of!

Now when I got my intercooler, this hesitation got even worse!

I went from 1-2 feet of plumbing before the throttle body to over 5-8 feet (Intercooler piping) of piping!

My Hesitation got about 50% worse.

I then upgraded to Z32 AFM and placed it 1 FOOT before the throttle body and the throttle response got 10x better BUT that "hesitation" is still there…

Heres the kicker.

The ONLY things my car has to run is:

Fuel temp sensor.

MAF (AFM)

CHTS

Crank Angle Sensor

TPS

THATS IT.

Sooo… I guess its a programming issue going against the Nissan engineers rather than a Vehicle issue…

Then again maybe someone more knowledgeable can chime in :baton

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'''Guest:''' <small>(2008-05-12 21:27:49)</small>

it seems to be a problem with alot of cars. my Zs do it my jeep does it friends 96 ranger does it etc. etc. etc probably does have to do with the maf.

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'''Domdogg123:''' <small>(2008-05-13 21:31:57)</small>

Look for vacuum leaks.