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Car Forum / Nissan / Nissan Z Cars / January 2005my Z boggs down
hey guys, if i shift fast and give it any gas before the clutch is all the way out the car backs the timing off, boggs down and then knocks, i want to know why it does this and how i can fix it > hey guys, if i shift fast and give it any gas before the clutch is all the > way out the car backs the timing off, boggs down and then knocks, i want > to know why it does this and how i can fix it And it's what kind of Z?  SignatureSteve http://www.atlantaracing.com sorry, its a 1990 300zx N/A > sorry, its a 1990 300zx N/A Using premium fuel I hope? How do you know it's changing the timing? Sounds more like a MAS issue to me. SignatureSteve http://www.atlantaracing.com yes of course im ussung premium, and i think the computer is delaying the timing because all power is retarded when i refer to it as bogging down, and then it knocks once, i was thinking maybe a knock sensor(detonation sensor) complication, but MAS sounds very relivant and ill look at it, thanks alot, if u have any other ideas please share it would be much appreciated -josh > yes of course im ussung premium, you'd be surprised how many people don't was why I asked. > and i think the computer is delaying the > timing because all power is retarded when i refer to it as bogging down, > and then it knocks once, i was thinking maybe a knock sensor(detonation > sensor) complication, Probably is more a lean condition causing this. The knock sensor never comes into play unless you use cheap gas. Some people think the engine "bounces off" the knock sensor keeping the timing at the maximum it can stand, that isn't how it works.. > but MAS sounds very relivant and ill look at it, > thanks alot, if u have any other ideas please share it would be much > appreciated You might "play" with the TPS adjustment and see if it helps.. SignatureSteve http://www.atlantaracing.com thanks alot man i really appreciate it, ill mess with the tps and mas, but running lean could be because ive got an aftermarket intake on my car, and i dont have the upgraded ecu in yet to correct it. ill put that in as soon as it comes, hopefully oe of those things will fix the problem Please see the following: http://twinturbo.net/ttnetfaq/FAQpages/hesitate2.html Page 6 paragraph entitled "Induced turbulence in the air intake." It refers to the airflow around a POP charger being so smooth the MAS will have trouble registering the correct amount of air and giving strange readings to the ECU. The fix is to place duct tape along the bottom of the charger. The article says this should eliminate the problem. > thanks alot man i really appreciate it, ill mess with the tps and mas, but > running lean could be because ive got an aftermarket intake on my car, and > i dont have the upgraded ecu in yet to correct it. ill put that in as soon > as it comes, hopefully oe of those things will fix the problem thanks alot man > thanks alot man i really appreciate it, ill mess with the tps and mas, but > running lean could be because ive got an aftermarket intake on my car, Ah ha! That can make them have strange running problems and the oil from the filter can trash the MAS. SignatureSteve http://www.atlantaracing.com |
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