No acceleration

[zoemayne]

thanks for the advice. I changed the cv joints(goodyear), brake pads(dealer) ,2 pulleys(accident caused),1 shock(was in an accident), many other parts due to an accident in which the left fender was hit. Had the radiator fan replaced by Tirekingdom - they ripped me off it was not needed and I specifically asked thim to save the part for me they didn't. Radiator replaced...There was a point where the oil was not changed on the car for ~ 8k miles so theres buildup in there.

I think I'll post a video on youtube so you can have a better idea of what I mean. When I get this current work done on it(o2 sensors spark plugs etc) I'll go about doing that prob in the next 2 weeks i'll have it up.

Maybe if i'm lucky changing the spark plugs would solve the problem.

I definately need motor mounts which I hear can only come new from the dealer. I looked up NGK.com and I see they mention how the spark plug and o2 sendor interact so maybe thats my problem.

[Nahkapohjola]

Originally Posted by zoemayne

... and o2 sendor interact so maybe thats my problem.

No real 'interaction' but O2 outgoing signal warps from bad burn process, ECU makes 'decisions' based on that feedback (=closed loop mode).

O2 is not used when cold, only after warmup.

Coilpacks contain hi voltage coil & fried electronics, they also can fail heat related.

[zoemayne]

What would cause a bad burn process? Cat conv/ECU/Coil/MAF sensor? I had these sensors on the car for less than a month and their burned out. I know chances are the replacements will get burned out & i want to avoid that.

Also when I replaced the O2 sensors the car drove perfectly..... for ~ 3 weeks so thats another reason to believe its not the tranny.

Does this make sense to you? - after i replaced the 3 bad O2 sensors the vehicle never stalled again.

Come to think of it probably over a year ago the dealer told me I had to replace a coil (or 2). I backed out of doing it because they're crooked and have made me replaced parts unecessarily in the past. I remember they wanted ~$600.

[Nahkapohjola]

Originally Posted by zoemayne

What would cause a bad burn process? Cat conv/ECU/Coil/MAF sensor? I had these sensors on the car for less than a month and their burned out. I know chances are the replacements will get burned out & i want to avoid that.

Also when I replaced the O2 sensors the car drove perfectly..... for ~ 3 weeks so thats another reason to believe its not the tranny.

Does this make sense to you? - after i replaced the 3 bad O2 sensors the vehicle never stalled again.

Come to think of it probably over a year ago the dealer told me I had to replace a coil (or 2). I backed out of doing it because they're crooked and have made me replaced parts unecessarily in the past. I remember they wanted ~$600.

Plugs, coilpacks directly work on igniting the fuel vapor. The crooks diagnosis is possibly right, price is not: go shopping and DIY swap. Also the mileage points there.

What doesnt point there, is that your power loss is almost total: you need five simultaneously failing coilpacks. On the other hand, one MAF can kill engine.

When problem is ON, unplug MAF wire, see if there is any change. Should be if its the culprit. (practice taking it out beforehand)

But. You cant continue with free miles - there isnt such. Go get another MAf fron JY.

[zoemayne]

update: the mechanic thats working on the car says after he replaced the o2 sensors and hooked the car up to a computer he gets and error on the speed sensor and thats likely what is causing the no-acceleration issue. i never heard of a speed sensor but I'll look it up.

[Nahkapohjola]

Originally Posted by zoemayne

...a speed sensor but I'll look it up.

FSM EL-104 SPEEDOMETER:

"The combination meter provides a voltage signal to the vehicle speed sensor for the speedometer.
The voltage is supplied
- from combination meter terminal 15 for the speedometer
- to terminal 1 of the vehicle speed sensor (with TCS).
- to terminal 19 of ABS actuator and electric unit (without TCS).
The speedometer converts the voltage into the vehicle speed displayed.

DIY tests:
See EL-114: Voltage 0.5V, resistance 250Ω

(The sender unit in 3gen is known to pop out, will cause problems...)

[zoemayne]

i uploaded the video on youtube. i changed the plugs and 02 sensors and as i expected the problem persists. I took it to the dealer and they said its the throttle body most likely. I looked up the cars history at the dealer and coil#1 was replaced. The last interaction i had w the dealer in 07 was they reccomended a fuel induction/induction clean... which was quoted at ~$700. I went to a near by jap nissan parts place and they told me it was likely the cat converter. I was gonna let the dealer check it but every1 that works at the dealer are newbies b/c evr1 was fired...... so i'll just let som1 from the jap parts place check it. cat conv and thrtle body at the dealer is ~ $750 each haha. I'll have it looked at on monday. The videos are here
no acceleration : http://www.youtube.com/watch?v=OMJQY9UQfLI

normal acceleration: http://www.youtube.com/watch?v=Cl0kJQdXjKg

[Nahkapohjola]

Originally Posted by zoemayne

...they reccomended a fuel induction/induction clean... which was quoted at ~$700. ....cat conv and thrtle body at the dealer is ~ $750 each haha.

Dont let em laugh...

To me thats tranny totally disconnected -or- in SAFE-MODE.

Oil pressure ctrl, band or clutches slipping? Slipping is normally on always, but pressure is controlled by TCU computer, and that depends on signals it receives. If a sensor fails, then tranny drops into SAFE-MODE and behaves just like that. Many issues may trip that feature ON.

Have u run the tranny self diagnostics? I bet NO. On some models You can do it yourself, just read the FSM. Or go to dealer, sit by as the tranny diag is run. Pay only for diag, total price has to be known beforehand.

The problem here is that when u go to shop, all is ok. And u get only charged... well, thats not the shops fault but cars...

Maybe tranny rpm sensor intermittently disconnects, or its connector is bad, vibration causes it to play... You can go and measure or ask shop to do that specific resistance measurement. Also all tranny solenoids have a resistance value: ask/demand what are those, what are yours...

Long shot: I'd goto JY, find tranny rpm sensor, ask shop to swap it, 10 minutes. Total should be under 100$.

Although this tranny isnt the same, THE issues are very similar, read: http://www.cardomain.com/ride/748507/15 ... Read also p.14 ...

Pressure: I'd try tst disconnecting pressure bypass resistor when the problem is on. Find it and be ready when problems surface.

What it surely is NOT: TB, CAT... dont let em milk you.

[zoemayne]

it was the speed sensor (rev sensor) which is located behind the drivers wheel/shock. $170 dealer part. The engine light is on b/c of the O2 sensors so I'll have a mechanic that will hook it up at the dealer and see if the O2 sensors voltage readings are correct. when he hooked up his reader to the car it said the ecu must be reprogrammed because of the change of O2 sensors (I added the O2 sensors a month ago aftermarket). The car accelerates correcly now though.

[heyyo302]

get acceleration code and try it
At = r*α
Ac = r*ω² = r*(αt)²
Equating these 2 gives
t = 1/√α = 1/√.25 = 2 sec

[heyyo302]

Hello, this may be caused by a bad MAF, or emissions control equipment (EGR, etc.).This is a fairly common topic. Search through the Maxima forum for bad MAF, EGR, rough idle, and related topics (don't forget to search archived threads, too). You should find a lot of info. Have you checked the plugs, wires, and distributor? When was the last time they were changed?
The stutter on throttle and random wavering makes me thing it's probably a bad distributor or plugs. If so, you get off easy. Usually best to start simple and work up.

[Nahkapohjola]

Originally Posted by zoemayne

it was the speed sensor (rev sensor) which is located behind the drivers wheel/shock. $170 dealer part. The engine light is on b/c of the O2 sensors so I'll have a mechanic that will hook it up at the dealer and see if the O2 sensors voltage readings are correct. when he hooked up his reader to the car it said the ecu must be reprogrammed because of the change of O2 sensors (I added the O2 sensors a month ago aftermarket). The car accelerates correcly now though.

As I said, it was locked in SAFE-MODE b/c of computer getting no relevant signals.

Reprogramming is bs, but a stealerships hilarious way to charge unawares... FYI: Computer regenerates its data tables itself - after they have been cleared, say pwr supply off for 30min or more.

[zoemayne]

im thinking the O2 sensors could be bad cause their not specific to the car. when i went to try to get a refun from auto parts store the manager said that the parts are tested thoughrly to meet specifications and the parts are BOSCH (spelled wrong) so........ I dont know maybe i have to get OEM. Cause two of the previous new BOSCH sensors were burned out in like 3 weeks and i'm guessing thats whats happening now to these sensors.


You were right about the SAFE MODE theory thanks. I was getting too many theories so i stopped listening to em.

[Nahkapohjola]

Originally Posted by zoemayne

im thinking the O2 sensors could be bad cause their not specific to the car. when i went to try to get a refun from auto parts store the manager said that the parts are tested thoughrly to meet specifications and the parts are BOSCH (spelled wrong) so........ I dont know maybe i have to get OEM. Cause two of the previous new BOSCH sensors were burned out in like 3 weeks and i'm guessing thats whats happening now to these sensors.


You were right about the SAFE MODE theory thanks. I was getting too many theories so i stopped listening to em.

Hey its not theory but txt in the maintenance manual, just read ... as said, I have had that condition once via emergency braking - also indicated in the tranny manual section.

What 'burned out' actually means?

Sensor manufacturers do stamp their products for all carmakers. Nissan has its own demands which may be even less strict (!) than on some generic product brands. To get production running, carmakers will use any product to keep mfg lines going.

Top brand marketing names have invested into product line name, and want to back em up. Generally I wont buy Nissan products but generic top brands. This Saga of "original" parts is carefully cultivated to milk me & yalll ppl.

[zoemayne]

i replaced 2 of the 3 new bosch sensors. the 2 were on the car for less than a month but when i took them out the bronze ends were blackened as if they were fried electrically. the third one which was located further down on the pipe was still in new condition.