Forums/Z31P/z31-repairs-forums engine-mechanical/Slight Hesitation
Imported from Z31Performance.com Forums{{#if:TearingRaven| — original post by TearingRaven}}{{#if:2008-05-12 09:40:06|, posted 2008-05-12 09:40:06}}{{#if:4| · 4 post{{#ifeq:4|1||s}}}}{{#if:/Z31performance_archive/forum/z31-repairs-forums/engine-mechanical/4884-slight-hesitation.html|
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TearingRaven: (2008-05-12 09:40:06)
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!
1SIKZ31: (2008-05-12 12:07:06)
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
Guest: (2008-05-12 21:27:49)
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.
Domdogg123: (2008-05-13 21:31:57)
Look for vacuum leaks.