ntempleton

I have heard that I have a poor grounding and need to reground my car. I have just recently upgraded the stock air box to a cone intake. Everything else is essentially stock. Is it possible that I need to buy a boost controller, because the stock part believes that the car is getting too much air so it slows the engine down temporarlily? Or do you believe that I need to simply reground my vehicle?
By the way, this happens on my 88 TII, and it only happens when I am accelerating hard at higher RPMS, anywhere from 3900 to 6500.

steve0178

a similar thing happend to me in my 300zxtt. It would pull hard then just die. It ended up being a boost leak under the intake manifold. Did you check all your boost lines for cracks/splits?

nfs05

check to see if your intake piping isnt collapsing under boost, ill bet you its that

ntempleton

Ok i will try that, but I think my piping is fine, since I replaced so much of it recently anyway (many of the rubber pipes seemed to have been dried to hell). Any other suggestions?

Snrub

iTrader: (1)

The answer to your question is no, you don't need a special boost controller. Did you mean "boost sensor," it is possible that is malfunctioning. It sounds like you're getting what we tend to generically refer to as hesitation. Intake/exhaust mods can cause your boost to increase because the stock wastegate is not able to vent off enough exhaust to control the boost. If your boost hits 8.6psi the ECU will cut fuel to the rear rotor. Has your exhaust been changed in any way? I'd be surprised if an intake alone is causing that much of a boost increase. The solution is either to port the wastegate or get a fuel cut defensor (FCD) and probably add fuel, depending upon how high your boost is.

Did your car suffer from hesitation before you changed the intake? If so then you're probably not hitting fuel cut. A common cause of this problem can be the TPS. You will want to test to see if it meets the properly WOT and no throttle condidions, but also check the sweep of motion (slowly and steadily) to ensure that it occurs smoothly. To do the later you will need a digital multimeter or an oscilloscope.

ntempleton

yes the exhaust has been upgraded, but im not so sure how much because i didnt do it. the previous owner upgraded the exhaust before i got it. No my car did not suffer from hesitation before i changed the intake. would getting a boost controller help, because i would be able to tune the boost down?-of course i really wouldnt like to fix the problem going this route because that would tune my performance down.