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Intermittant engine pulling back


Red_Nic

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Hi Guys,I've had no luck searching the forum for this.Once on fri, once on mon, and once today, my engine has 'pulled back' for 1 second , whilst I'm driving a constant 50 or 60mph.My foot is steady on the pedal and I felt the engine hesitate for 1 second and then continue.Any ideas what it could be?My mechanic had a theory and loosened my fuel cap (i have 1/4 tank petrol) on Tuesday to ease pressure? It didn't stop it pulling back today.thanks in advance

 

 

edited: new photo

IMG 20160908 122802

Edited by Red_Nic
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it sounds like it could be a bad earth somewhere other than that could be a sticky throttle body

there the cheap options i think before you get into bad senor somewhere.

 

 

as for loosening the fuel cap ???? im no mechanic but dont all tanks have a breather pipe ie its not a vacuum ????

 

see what the jedi's of the forum say

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IMG 20160908 122802


picture up loaded on my control panel just now.
Went to drive off for lunch.
Engine pulled back, sluggish, engine light came on, ESP light came on, skidding light came on (I didn't skid).
All lights on constant now.
What do you think is wrong? will I be able to drive home from work tonight?

@z Fanatic
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picture up loaded on my control panel just now.

Went to drive off for lunch.

Engine pulled back, sluggish, engine light came on, ESP light came on, skidding light came on (I didn't skid).

All lights on constant now.

What do you think is wrong? will I be able to drive home from work tonight?

 

@z Fanatic

 

 

Obviously something is causing the CEL, was going to ask this before but as you didn't mention it i presumed not, however you now need to get the code/s to determine what is causing the CEL and go from there.

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My guess is throttle body position sensor. You can re-calibrate these with the pedal dance but seeing as your were losing power intermittently prior to the CEL light coming on I'm assuming it was on its way out. If you get an OBD2 reader and retrieve the code it'll confirm or deny it.

 

P2135 is the error code thrown out by a faulty throttle body.

 

I don't think you can replace the sensor on these - it'll be a whole new throttle body - what model of 350z have you got? DE or HR?

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what does MAF and TB mean?

 

How do I get codes?

 

Mass Air Flow Sensor - meters how much air is getting in through your filtered intake

TB - Throttle body - self explanatory

 

You can get to codes by doing the peddle dance but its miles easier using a mobile phone and an OBD2 plug - I'm sure someone local to you can let you borrow it to diagnose your issue.

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You can tell by the age most times, 2003-2006 are DE and DE Revup engines, 2007 and later are HR. DE is single Throttle, HR is Twin Throttle. Pics for illustration;

 

DE Bonnet - single Throttle

 

OEM0305350ZHood-ff2fcda6.jpeg

 

DE Engine, Single Throttle

 

Nissan_VQ35DE_engine_001.jpg

 

HR Bonnet - Twin Throttle

 

2007_350z_hood.jpg

 

HR Engine - Twin Throttle

 

IMG_1669.jpg

 

 

Let us know how you get on :-)

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so, when the mechanic plugged my car in, it said I had a faulty camshaft sensor.

 

Nissan parts were around £150 each sensor = around £450 total,

so he ordered generic parts from America on a 4 week lead time, £50 total for 2 camshaft and 1 crankshaft sensors (plus import tax?). Ordered crankshaft sensor too, just in case.

 

Mechanic has removed engine fault lights from dash.

I have to drive it for 4 weeks until parts come in.

Drove this morning to work, engine lights haven't come back on yet.

 

Any comments from anyone?

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  • 2 weeks later...

update.

Mechanic replaced my camshaft and crankshaft sensors.

It drove fine for 3 days, but today , car pulled back and the same dashboard lights came on (engine, ESP, skidding).

Plugged EOBD code reader in, it says P0340,

which manual says is "Camshaft position sensor A - bank 1 circuit malfunction"

 

which is same code from before.

 

any help/comments/experiences?

Edited by Red_Nic
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update.

Mechanic replaced my camshaft and crankshaft sensors.

It drove fine for 3 days, but today , car pulled back and the same dashboard lights came on (engine, ESP, skidding).

Plugged EOBD code reader in, it says P0340,

which manual says is "Camshaft position sensor A - bank 1 circuit malfunction"

 

which is same code from before.

 

any help/comments/experiences?

 

Hi Nic,

 

How much did you pay for the sensor/s?

 

Because I recently also fell foul to cheap aftermarket sensors which was not better than useless it seems.

 

It seems the OEM really are worth their value.

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  • 3 weeks later...

Winding this back a little, you say the ESP anti skid warning light came on - this would explain the slight hesitation. Could be the hesitation is being caused by the ESP kicking in rather than throttle bodies and camshaft sensors. I had the same experience with my 2005 350z, started with the odd hesitation when travelling at a constant speed but then became more pronounced - accompanied by the ESP light coming on. Turn ESP off and the problem disappeared. In my case I discovered the front wheels were out of alignment and the nearside tyre had worn considerably more than the driver side. Took the car in for a four wheel alignment (best £50 I have ever spent) and put two new tyres on - problem solved. My 350 is now on 149,000 miles and drives impeccably.

 

As with lots of marques, error codes can often be very misleading and are the delight of many main dealers because they just keep replacing the parts. Some errors can be instigated due to a small voltage fluctuation - i.e. the fault is not necessarily permanent nor does it require a part to be replaced. Many owners have experienced the airbag light coming on and it can be reset very easily, my engine management light has come on from time to time and I just reset the codes with a simple OBD reader. If there is a genuine fault the warning light will come back on immediately and will require further investigation.

 

I suggest you just try switching off your ESP (just don't floor it when exiting bends, might end up facing the wrong way) and see if the problem persists. If the problem goes away then consider the cheapest option first, tyres and wheel alignment - my guess is this will cure it.

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+ 1 on the voice of reason above, its not always down to just the one CEL code that's shouting at you, other dependent parts can cause the same CEL, although i would start cautiously by unplugging certain related parts/sensors and go from there, rather than jumping in and start buying parts.

And on the subject of only using OEM parts, i have always used third party manufactured parts, especially considering a lot of these parts are actually manufactured by third parties in the first place, and often by the same company, but carry the OEM stamp.

I have never had any problems with said third party spares.

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