Loss in acceleration + throttle response ??

DIGItonium

This thread:
Gas Pedal Delay

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DIGItonium

Rise from the dead! OMFG all these years of dealing with throttle lag under 3k RPM with the throttle barely opening up at low RPM and the surge after 2k RPM... the MAP sensor!

Got a used MAP sensor just to get by for now to try to resolve some idle hunting and what I think might be the reason for the hesitation when accelerating. Goodness gracious the car is so eager to rev in neutral, boost builds up before 2k RPM, lots more BOV venting at low RPM, etc. Even at higher gear applying more pedal equates to more "push."

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isuspense

hey man my car runs so much better when i unplug my map sensor. my nissan dealer said there are no problems with the car. but i have the same exact problems as you do. how much did you pay for a used map sensor? think i need to get one.
thanks

tjlazer

Where's the MAP sensor at?

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2009 370Z Monterey Blue,Nismo Conversion,RE-11's, K&N Typhoon intakes,Blue Kickplates,Homelink,FI 18" CBE,ERZ HFCs,Hotchkis sways, Swift Spec-R, EVO-R Highwing, UPREV

DIGItonium

Upper intake manifold. Towards back near driver side throttle. Single harness. Single 10mm bolt. Remove rear half of the engine cover.

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DIGItonium

I didn't try driving my car with the sensor unplugged. Idle would jump to 1k RPM and throw a code. I'm still dealing with this issue, which I think might be a vacuum leak somewhere. It happens when the car is "hot" after driving for awhile. It goes away after restarting.

I got mine from Z1, but I'm sure you can find one from the junkyard somewhere. It's about 1/3 the cost of a new one. I've been reading about symptoms of a failed MAP sensor, and most of my issues were similar: hesitation, lost power, etc. It's something I've dealt with even while bone stock. I can tell you even with my oil temps around the 200F range throttle response is still great.

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chops

so has this really solved it? i hardly ever drive my z these days (probably put 1k miles on it this year so far). today i drove it to work and the fucker was not going anywhere in any gears until i hit 3k RPM. as you said, a restart at the next redlight seemed to cure it.

DIGItonium

So far still feels great. It makes sense why some deal with this issue and some don't. I remember when I could peel out in 1st, and later starting in 1st felt like 2nd. Slow to ramp up. Now it's kinda scary... need new tires lol

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chops

well ****, it's worth a try. got a part number on the MAP before i go searching?

ZeN

I was hoping Digitonium findings would solve my hesitation issue below 3k RPM so i went and change to a new MAP sensor today, nothing change in term of response, it still hesitate. Went and reset and clear all self learn values via OBD2, sadly still the same. Next to attack pre cat O2 sensor and crank position sensor. I hate when i cant dart out from traffic due to this. Even civic and camry faster.

Wonka2581

Sub'd

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"I have nothing to offer but blood, toil, tears and sweat""Winston Churchill"

King

I always chalked this up to the emissions system. My car was like that from the day I got it, it's what I expected stock. Since I went catless it's fantastic, a friend of mine even noticed from the passenger seat via butt dyno.

I may be wrong but, I blame the EPA.

ZeN

I somehow thinks that my narrowband (post CAT) O2 is off. Have anyone tried running with the post CAT O2 off and disabling code via Uprev/Ecutek yet ? This will be my next attempt, unplug the harness for narrowband at CAT and give it a whack at temp >90 deg C, if it doesnt bog then we know open loop rocks. Anybody tried this yet ?

On second note - have anybody check their fuel dampener, that could cause bogs as well.

Zen