Cutting out in boost

[BigPar]

I'm having an issue of when I get into boost, or create load, the car is cutting in and out. It sometimes completly falls on its face to where I can feather the throttle and hear the turbo spool accordingly and nothing happens for a good 4-5 seconds. If I keeping giving it gas it will jerk every few seconds (cutting in and out). I have to completly let off the throttle and ease back into it seconds later to be able to drive it normal again.

I checked my spark plugs and they show no signs of lean or rich. The car will drive fine without boosting and even boosting at part throttle. Only after hard diving and getting it to cut in and out, then the car runs very sluggish under any kind of load. During this time I can sometimes barely buid boost. Sometimes I can get 6-6.5psi out of it but it's not pulling at all.

[Yellow4g63]

Psi test the intercooler pipes and see if there is a vacume leak. Could be the problem your having.

[GTR Shop]

Sounds like a crook pump, pump wiring or AFM.

[rustbucket]

Whats a crook pump?

[GTR Shop]

LOL... 'crook' = sick/bad/sad m(over here anyway)Must be the 'english' LOL

[Jesse J]

I had the same symptoms when my rb20 intake piping was missing the wire frame, which keeps it from collapsing when the turbo starts sucking. Same thing happened to a friend of mine with an rb20 swap as well, just an idea. very well could be a maf or boost leak problem too.

[sleepin240]

something else you might check is timing, I havent met a motor yet that was more sensitive to timing

[sleepin240]

also set spark plug gaps to .8 mm not 1.1mm, that might help too

[BigPar]

i've got ngk bkr7e-11 gapped at .032.

I don't have any kind of metal skeleton in the stock intake tube.

Don't have any boost leaks

Car runs fine in noraml driving, so I don't see why the timing being off or fuel bump being bad would cause it.

Plus, I just got an exhaust leak the past week due to finding out I have a broken off stud in the head for the manifold, so thats going to be fun fixing. So that explains the running sluggish and not hitting over 6.5psi. But I can still get it to totally cut out in boost in certain situations.

[gawdzilla]

try swapping out your maf

[BigPar]

try swapping out your maf

I'm the only rb25det swapped 240 in my city, let alone a series 2 engine. I can't really just swap it out and try another one.

[eh?]

95-99 maxima mafs are PNP.