wont rev past 3k, not MAF problem

[schizorazgriz]

So my S14 sr20det (s13 chassis) wont go past 3k rpm in any gear including neutral. This would normally scream MAF problem but when i unplugged my MAF at idle the car idle changed and then died so there is nothing wrong with my MAF sensor. Is there anything else that i could check that might be the problem? BTW for those of you who are wondering the MAF is a stock s14 sr20det MAF

[lok]

Try unplugging the maf and then starting the car and see if it runs.

Then plug everything back in and check the ecu for codes.

[discosteak]

yeah its the MAF dawg

[schizorazgriz]

but if i unplug my maf while the car is on it dies... doesnt that mean there is nothing wrong with it?

i heard that the ecu has different modes it can be in. could it just not be in the right mode for driving? if so how do i change it and how do i check the engine codes. all i see is one little ass screw and no leds

[Chernobyl]

Your car should run fine with the MAFS unplugged, but will have a 2500-3000 rpm rev limit.

Try a known good MAFS and report back. Or check for codes like previous people said. I know I had a bad MAFS once and no codes showed up.

[schizorazgriz]

[quote=Chernobyl;2659945]Your car should run fine with the MAFS unplugged, but will have a 2500-3000 rpm rev limit.

Ok so what does it mean if my car dies when i unplug the mafs? does that mean that theres something else wrong with it?

[lok]

sometimes it will die when you unplug the maf.

that is why i said try and start it with it unplugged. it will put the car in limp mode.

have you hooked up your consult wire?

[4x4le]

have you hooked up your consult wire?

ding ding ding! WINNAR

I dont know how people dont live without at least having a consult cable and Nissan datascan.....

[drifter_for_life06]

maf seems shot as previously stated....AAP might be able to read your codes for you

[Jus Skott]

might be cause i literally just woke up like 5 minutes ago. but i thought a bad TPS might cause the same thing.
~skott "mornings suck" B

[Z33dori]

usually the maf

my tps went bad it would just buck like a mo-fo

but when m maf went bad it wouldn't rev past 3k or so

[drifter_for_life06]

if the TPS goes bad I would think it should still go past 3k, just buck and carry on and do it slowly...? maybe im wrong...?

[Autobacs]

If your knock sensor is bad, it will do the something similar.

[schizorazgriz]

So we got a possibility of a bad MAF sensor, TPS sensor, and knock sensor.....

more symptoms. turbo will spool but no boost for that few hundred rpm before it tops at 3k. virtually NO throttle response. when im sitting at a stop light and hit the gas it sits for about ten seconds before stumbling up the rpm ladder super super slow.

[d-magic]

Another possibility would be bad ECU. Do you have check engine light?

[tep3]

the same thing happend to my car check ur intercooler piping and couplers.

[schizorazgriz]

OK so i fixed the throttle response problem. My fuel pressure was extrmely high and it wa flooding like a mo-fo. fixed that but my rpm will only go up to a little over 3k like 3300. When im in neutral however it will go up to 3k, drop, go up to 3500, drop, and so on and so forth. This happens while my foot is on the gas and im not letting off the throttle at all. I hope that makes sense. is the main cause still looking like the MAF sensor? I noticed that their might be a connection problem with my pcm valve.... could this maybe be it?

[910noskillz]

still seems like the maf, i would find someone that you could swap with.....kinda sounds similar to a boost leak also

[namfbroh]

I hate to bump an old thread, but I'm having the exact same problem. I was sure it was the maf because the ECU was throwing code 12 - Faulty Air flow meter. Replaced it with a known working MAFS, and it still does this. It runs extremely rich, and it won't rev past 3k. Any ideas what the problem could be? I'm going to check the wiring to the MAFS, but I'm beside myself with what it could be.

[Om1kron]

Take the maf sensor out of the housing and clean it make sure the diodes don't have a layer of dirt on them. Still doesn't mean it hasn't shit the bed.

now when you say it wont rev past 3k, does that mean under a load or like sitting in neutral you cannot rev it over 3k?

[OoAtreyuloO]

old thread bump same fuking issue here =[

[spoolin405]

its your MAF. borrow one of your friends or something. If its not that maybe its your ecu?? or wiring?:bash:

[HAWAII]

could be your piping also. might have a leak

[Swifty]

Ever try changing your fuel pump?

[thizzen4]

check ur tps sensor mine did the sammeeeee thinggg

[bookoo]

More than likely, it's a wiring issue, then maf, then tps, then fuel.

[wangan_cruiser]

i am bumping this back because it seems theres no straight answer to fix this issue. i am having the same problem. instead of opening another thread ill just bump it.

[h2v7]

PLEASE help bump


my car runs fine but after ten more or so of driving it wont let me rev past 3k

turn car off and back on and its fine just for a few minutes then wont rev past 3k again.

i have tried a few different MAFS and it does not change a thing.

[4x4le]

have you hooked up your consult wire?



I dont know how people dont live without at least having a consult cable and Nissan datascan.....

Guys, get a consult cable and nissan datascan or have fun throwing parts at your car and asking the same question over and over again on zilvia.

If its not the maf it could be practically anything else. Youll save money the first time being able to figure out whats wrong. From then on youll also save money being able to get the right part the first time.

:picardfp:

[speedys]

im not sure what is going on with my car, while driving my car doesnt let me go pass 3-4000 rpm, and when im about to stop the car almost turns off and idles back to 1,000 rpm.

any ideas on what it can be.

i tried unplugging the maf while the car was on to see if it would turn off , and it did, so im not sure what it can be.

[XxHybridx]

Bumping this shit. Car started doing the same thing as to others. Didn't wanna make a new thread. So basically my problem is a tad bit different. I can rev past 3000 if I'm parked in neutral. But in gear it starts to bog. Won't go past 3000. This happened on the way to work right now so I haven't got a chance to look at it yet. ALSO, yesterday some street to get to my house was a little flooded so had to get my car in there.(nothing too had tho). Not sure if it's by chance that it happened today or not? Gonna go unplug my maf sensor and see what it does on my lunch break. The basic steps seems like, maf wiring > maf sensor > fuel delivery?? Oh and it's a KADE. All stock. 1993.

[XxHybridx]

Ok..so after work my car worked fine what the fuck -.- went and put some gas. Should I be worried or what. Thinking of changing the maf sensor anyways.

[blades13.5]

Thanks guys. Previous to reading this, I bought a zT-2 wideband O2(not hooked up) AEM Ems(not hooked up), Went through 2 sets of injectors, 3 MAF's, 2 fuel pumps and thousands of dollars at a shop to try and get my car running right(before i bought the ems, and the wideband.) anyways, I bought some 370cc injectors, am in the works of trading my tuned ECU for a stock ecu right now and plan on running with either an OEM O2 sensor(which i dont have yet, but i figure will eliminate more variables on my capabilities) or the wideband.

P.s. not a whole lot of money atm because of a move across country for my wife an I which is why I'm trying to see if i can get her fixed(the car) before winter which is why I dont just get the wideband/Ems tuned + sensors installed.

That fuel pressure listed above sounds exactly like one of my issues as I have Zero acceleration as well on top of my engine running rich and my engine's oil being mixed with Gas. I'm refilling with all mew fluids, and I just bought a Datascan tool as well as someone earlier suggested. Planning on getting this done Right, for the last time.

Heres my list of problems with my solution.

Lack of acceleration
Fuel pressure -> datascan/ Wideband
O2 sensor -> Wideband/ purchase new
MAF -> Datascan/wideband - clean.
Tune -> For now OEM Ecu dont have to worry about tuning
Clutch Slip -> New Clutch
TPS -> backup one ;)

What do you guys think?

[WERDdabuilder]

i probably dont know wtf im talking about but my friend had this exact problem. i believe it was due to a bad coil pack. changed it and ran perfectly fine after.

[s13_chris93]

bumping this again. my car wont rev past 2k rpm it just bogs. tried unplugging the maf and the car didnt die. tried cleaning the maf sensor. didnt work. any suggestions?

[ultimateirving]

bumping this again. my car wont rev past 2k rpm it just bogs. tried unplugging the maf and the car didnt die. tried cleaning the maf sensor. didnt work. any suggestions?

The fact that nothing changes when you unplugged the maf could point to faulty wiring or a bad sensor entirely.

[BasedOMG]

Bump
Car will rev past 3k in neutral but once in gear its like I have to keep the clutch in a tiny bit and baby the gas or else the car will bog. I turn off the car for a while and then it works fine for like 10 minutes of driving. Wondering if its the TPS

Sent from my SM-G530T using Tapatalk

[cotbu]

There's no need to bump the thread with descriptions of the same problem.
Especially if you haven't done anything to fix your issue. Pull codes!
No codes then its not a sensor issue.
Could be fuel or fuel pump. Timing is going to be jacked have you checked that.
Or just post
Tell me how to fix my car!
Or would you rather have people quote the same suggestions that you should have read like I did.