Almera 1.5 2000 Juddering when Idle and accelerating

M

moseph

Hey yall,

I know MAF's have many a thread attributed to them, but non really answer my question.

Ive got an intermittent fault that used to throw up a P0171 code on my ECU, although after cleaning Lambda sensors and EGR seems to not come up as much, ECU sometimes comes on but resets itself quickly.

But im still getting problems with a lack of power in 4th and occasionally stalling when coming to a stop... makes me think its something MAF/IAC related...

The problem im having is disconnecting the wiring loom from the MAF, its being a pig and no matter what i cant seem to get the damn thing off.

Can anyone give me a straight forward guide to remving the wiring loom, ive tried evreything but it seems to be stuck on, the little green button is stiff as hell, when i push it in its ridiculously hard and theres little purchase to then pull out the wiring loom from the connector... any tips help or advice would be appreciated as I want to rule out the MAF before i take it back to my mech to have another look at it...

pictures or videos would be appreciated, i found one on youtube of a guy taking the maf out of an altima but he made it look far too easy, my connectors pretty stuck on there as i doubt its been taken off since the car rolled out of the factory in 2000

first post so be kind, if theres another thread on here that has a guide link me up :)
 
The small clue of 2000 leads me to think you have an N16 Almera, but we still dont know which engine...

-phone-
 
edk said:
The small clue of 2000 leads me to think you have an N16 Almera, but we still dont know which engine...

-phone-
Click to expand...

hey Edk,

cheers for the quick reply, it is an N16 but to be honest im not sure on the engine specifics, its a 1.5 if thats any help.

mkKSN-ipmGfwyEn-64SVGYA.jpg


It looks just like this tho, the little green slider is a right pain to push in and very little purchase to pull the clip out... i just want to try and see how it runs without the maf and either way if i replace it im gonna have to undo that wiring loom anyways
 
1.5 is what we need to know as there is also a 1.8 petrol and 2.2 Diesel.

I'm sure someone will be along to help you out soon :)
 
edk said:
1.5 is what we need to know as there is also a 1.8 petrol and 2.2 Diesel.

I'm sure someone will be along to help you out soon :)
Click to expand...


read the first line, got my hopes up, read the second... wounded hahaha :P

mainly i jsut want to make sure theres not something daft and simple that im missing, the other wiring connectors in my engine have clearly caused my mech some difficulties as theres notches and scratches where hes obv used something to push them im (when he did my lambda sensors and EGR value) but ive been trying to do this for a week or two now and its doing my nut in...

A little off topic but as a fellow community moderator (of another forum that shall remain unmentioned, im no troll) i thought id commend you on a speedy and helpful reply,,, alot of forum mods are lurking in the shadows so its nice to see one that gets involved
 
We try to help. Sorry I can't help you out directly with this but don't own the same model, but plenty of tinkerers out there with petrols who will know.
 
P0171 is the fault code I had with my 1.5, I changed both lambda sensors and the MAF sensor

If I remember correctly the MAF does flag up this and it can also flag up P0172 code if its not working correctly everytime ive had a fault code like that ive changed MAF's and its gone away (4 times now)

Hope this helps you
 
Pred1012 said:
P0171 is the fault code I had with my 1.5, I changed both lambda sensors and the MAF sensor

If I remember correctly the MAF does flag up this and it can also flag up P0172 code if its not working correctly everytime ive had a fault code like that ive changed MAF's and its gone away (4 times now)

Hope this helps you
Click to expand...

Hi pred,

Sorry for delayed reply but thats what I expect, I had the spark plugs changed today and the prpblem seems to have got worse, I really want to rule out th. Maf but the dang thing aint budgin (possible corosion on the connection?) and its doin my head in, if anyone can give a simple walkthroughto diaconnect the wire id be muchly greatful, the rest I can do myself n loathe. To pay mech rates to disconnect a bloody cable
 
erm, you need to like push the green button in, as well as the like button as well i did mine with a screw driver and just wiggled it and it eventually came out, it is really difficult to do i had to work at it for quite a while
 
HI Pred,

Cheers, it does seem to be a damn sight harder than other wiring connectors (lambda, coils etc) to get off, but just so I can clarify you said

"you need to like push the green button in, as well as the like button as well" Im already pushing the green button but whats the other button your referring to??

I managed to find some pretty high quality pic on a Czech/Russian site, fired into Google Translate here which do show the removal of the loom in pretty high res, but the text description kind of skirts over the wiring removal, ive got a mate giving me a hand with it this afternoon to see if we can get the damn thing off, ill update if i get any progress
 
quick update, definitely not the maf sensor, managed to get it unplugged this afternoon (with some leverage from a big screwdriver) and engine choked like crazy, plugging it back in went back to "normal" with the juddering..... now can see the judder in the exhaust fumes and smells a little petrol rich

Ive already had EGR cleaned and both lambda sensors.... im really hoping its not timing chain stretch (which fuel smell makes me think its not) but im wondering if anyone knows whats next, Fuel Pump... Throttle body,,, IAC??

any helps appreciated
 
rowdy-GTi said:
A stretched chain will effect the timing, which will effect the fueling.
Click to expand...

yea im hoping its not the timing chain, im trying to rule out all other variables first

odd thing is i had my spark plugs changed yesterday and the prob seems to have got worse with the new plugs *confusing* :confused:
 
I'm having the same issue on my 1.8 .
I have the Management light on,checked with OBD and say's it the crankshaft sensor ...
Changed both sensors ,no difference.
After a while ,with no engine noise ,now i can hear clearly the clicketty-clink of the timing chain ...
You don't want to wait for that .


If anybody knows a reasonable mechanic in Aberdeenshire ,please let me know.
 
T£C said:
I'm having the same issue on my 1.8 .
I have the Management light on,checked with OBD and say's it the crankshaft sensor ...
Changed both sensors ,no difference.
After a while ,with no engine noise ,now i can hear clearly the clicketty-clink of the timing chain ...
You don't want to wait for that .


If anybody knows a reasonable mechanic in Aberdeenshire ,please let me know.
Click to expand...
I know one who will do it for £200.
 
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