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Thread: partial throttle break-up

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Posts: 1-8 of 8
2011-10-20 15:56:10
partial throttle break-up
ok ive been trying to figure out this for a while now whats going on is while your on a steady cruise lets say highway speed keeping constant throttle input after a min or so the car will start to sputter break up and loose and throttle input almost like a stall then if you press the pedat to wot jus for a second it stops clears up and is fine another min or so then is does the same thing all over again .
second thing is if you got WOT build max boost and waste gate open it fall right on its face plenty of boost just feels like it hits a wall and all u hear is an open waste gate ive swaped around two different tps and fuel pressure is at 38 psi pinched vac line to regulator already checked for boost leaks im running and 300zx blow through set-up with 72lbs injectors and jwt 72lbs 300zx maf program
2011-10-24 15:00:52
guess no one has had this issue then
2011-10-24 21:33:33
check maf voltage and check vacuum line to wastegate.
2011-10-25 00:22:41
Check plugs?
2011-10-25 01:26:50
If gap on plugs is too small it can cause some issues like this. But it doesn't seem like that is the issue. Worth checking out.
2011-10-25 01:39:59
shouldn't you be closer to 44psi? can you post a datalog for us? Too many possibilities.
2011-10-25 04:37:40
I thought it was always around 36psi vac line off and plugs jus changed gapped a .036 as far as data logging i cant at the moment i had my snap-on modis scanner in my back seat and it got stolen right out of it in the employee parking at the dealer i used to work at so havent been able to check codes or anything
i dunno im starting to lean towards tps wiring i mean as soon as i blip the throttle it clears up does that clear the maf of failure i wish i knew sum one with a z32 maf locally just to try another thing i should probably attached my fuel pressure gauge (snap-on) to the gauge port on the port on the fpr and drive it see if possible fuel pressure dropping while cruising but then again does that really explain the clear up after pressing the pedal to wot the clear it up
2011-10-25 14:41:47
Fuel pressure should be set to 44psi with vac line off. When I got done with my swap, i started my motor to make adjustments and my nismo fpr was at 35psi with vac line off and my car was choking before adjusting it to 4bar. Unplug your maf and see if it does the same thing, if its better then it could be your maf. From what u said it's doing, I had a 240 before doin the something and found it to be my intake hose was tearing apart and when I WOT it went away. So check for vacuum leaks.
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