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  #1  
Old 08-07-2013, 08:52 AM
nice_man_36 nice_man_36 is offline
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1999 Maxima
 
Join Date: Apr 2012
Posts: 11
Default nissan maxima 2001 bad torque

hello every one
i have Nissan maxima 2001 full option VQ30 automatic gear im tird too much with this car i feel there is no torque its like 1.8 car and take too much fuel cuaz im always push more acceleration to let car run

i sent my car to maxima garage maybe he has any idea about this problem he try 2 days try change
1- MAF
2- clean throttle body
3 -change TPS
4- chk fuel pump and change 2 regulator
5- 6 coil and plugs
chk all pipe for air leak but its ok all
and car still need push half acceleration to run

i read there is maxima coming 220 hp and 230 hp if my car 220 hp it will be this big defrant ?

i read also this ECU need to program or can change hp chip is this correct ? to increase power ?

my friend have maxima 2000 he can make front tire racing but my car cant race it will normal move

this too video show problem

+ YouTube Video


+ YouTube Video


this car dont have o2 sensor i think
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  #2  
Old 08-07-2013, 03:19 PM
NissanTech's Avatar
NissanTech NissanTech is offline
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2004 Xterra
 
Join Date: Jun 2005
Location: California
Age: 52
Posts: 12,536
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Quote:
i sent my car to maxima garage maybe he has any idea about this problem he try 2 days try change
1- MAF
2- clean throttle body
3 -change TPS
4- chk fuel pump and change 2 regulator
5- 6 coil and plugs
chk all pipe for air leak but its ok all
and car still need push half acceleration to run
That's a lot of parts. Why did he replaced all those parts?

Did he did any inspections before replacing any parts? e.g. compression test, dyno test, fuel pressure test? why replace so many parts.
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  #3  
Old 08-07-2013, 04:09 PM
nice_man_36 nice_man_36 is offline
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1999 Maxima
 
Join Date: Apr 2012
Posts: 11
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we didnt buy all this part only replace and check if any change but same no change
only 2 fuel regulator new and 6 coil new cuaz before one coil was problem so better i change 6 new and for tps before rpm was go up and down i think problem and i change with my hand but was only need adjust but its oky but untell now still same problem i dont know why
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  #4  
Old 08-07-2013, 04:13 PM
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NissanTech NissanTech is offline
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2004 Xterra
 
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The next thing you need to do is perform a compression test. You should also check the catalytic converter. Sometimes the converters failed and block the exhaust system.
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  #5  
Old 08-07-2013, 05:01 PM
nice_man_36 nice_man_36 is offline
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but if catalytic converter blocked how smoke will go out i think its out normal ?
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  #6  
Old 08-11-2013, 12:54 PM
nice_man_36 nice_man_36 is offline
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i check all somk pipe there is no any carbon inside and i dont have this catalytic converter

so what can i do for next step
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  #7  
Old 08-15-2013, 07:11 AM
nice_man_36 nice_man_36 is offline
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1999 Maxima
 
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hello evry one i check yesterday MAF Volt its was

term 1- this sent volt to computer from 1.6 to 1.8 in worm but not increase more then 2 volt or 2.... not reach 3.0 volt i think this low input volt

term 2- ( 5 volt )

term 3 - GND

term 4 - battary volt


+ YouTube Video

is this make car too lazy ???

Last edited by nice_man_36; 08-15-2013 at 07:29 AM.
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  #8  
Old 08-17-2013, 07:53 AM
flamax flamax is offline
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2001 Maxima
 
Join Date: Nov 2011
Posts: 45
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Per EC-162 step 8 of the FSM the MAF voltage to the ECU should be:

- approx 1.0V with ignition switch ON (but car not started)
- 1.2V to 1.8V at IDLE (~700 RPM)
- 1.6V to 2.2V at 2500 RPM
- approx 4.0V at 4000 RPM
- voltage should change linearly from IDLE to 4000 RPM

If any of these is not met, replace the MAF with an OEM Nissan part only.

Last edited by flamax; 08-17-2013 at 07:57 AM.
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  #9  
Old 08-17-2013, 08:06 AM
nice_man_36 nice_man_36 is offline
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Quote:
Originally Posted by flamax View Post
Per EC-162 step 8 of the FSM the MAF voltage to the ECU should be:

- approx 1.0V with ignition switch ON (but car not started)
- 1.2V to 1.8V at IDLE (~700 RPM)
- 1.6V to 2.2V at 2500 RPM
- approx 4.0V at 4000 RPM
- voltage should change linearly from IDLE to 4000 RPM

If any of these is not met, replace the MAF with an OEM Nissan part only.
THX ALOT
i do all that but signal from MAF to ECM when be 4000 rpm volt lest 4v its come like 2.... v i change MAF from other car working very good and same my problem no any change i dont know where the problem need to program again or ???
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  #10  
Old 08-17-2013, 12:17 PM
flamax flamax is offline
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2001 Maxima
 
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Quote:
Originally Posted by nice_man_36 View Post
THX ALOT
i do all that but signal from MAF to ECM when be 4000 rpm volt lest 4v its come like 2.... v i change MAF from other car working very good and same my problem no any change i dont know where the problem need to program again or ???
Here are the MAF failure types from the FSM:

(Malfunction A) an excessively high voltage from the sensor is sent to ECM when engine is not running,
(Malfunction B) an excessively low voltage from the sensor is sent to ECM when engine is running,
(Malfunction C) a high voltage from the sensor is sent to ECM under light load driving condition,
(Malfunction D) a low voltage from the sensor is sent to ECM under heavy load driving condition,
(Malfunction E) a voltage from the sensor is constantly approx. 1.0V when engine is running

It sounds like you have Malfunction D, low voltage from sensor under heavy load (high RPM). Possible causes for Malfunction D are:

1) Harness or connectors (The sensor circuit is open or shorted.)
2) Intake air leaks
3) Mass air flow sensor bad

Since you've already checked you get +5V and battery voltage to the MAF, I would assume #1 is not the cause. So the next cause would be intake air leaks --- have you checked the air path to and from the MAF to make sure there are no leaks (no hissing sound, none of the tubes are blocked, etc). If you are sure you have no intake air leaks or blockages, then the only cause left would be a bad/failed MAF. In that case you want to buy a new one, but make sure it's a Nissan OEM part and not some aftermarket one. Also, the newer Nissan parts have a green dot on them, so be sure you get one with a green dot! The last time I needed a new MAF I bought this one off eBay for $91, it works great: 2000 2001 Nissan Maxima Mass Air Flow Sensor | eBay
(this is a real Nissan dealer selling green dot parts, don't buy from a 3rd party seller, they might sell you a fake one or scam you some other way)

Last edited by flamax; 08-17-2013 at 12:21 PM.
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