Power problem in 4th gear, advice please!

G

gutbuster2k2

Hi gang, my girlfriend just picked up a nice n16 almera, its a blue 5 door 1.5 sport version, very nice car but seems to down on power in 4th and 5th gear. just wanted to know if its normal, seems to drive well up to 3rd gear, rev up to about 3 to 4000 revs then change in to 4th then it seems to drop power, i can put the peddle to the floor and it barely speeds up, i just think it should be a bit more responsive, but i havent drove another n16 so im not sure, could someone tell me if this is normal??

any help would be great!
 
As has been said on this forum many times before, the 1.5 isn't a big engine for the weight of the N16, so it's not what you'd call 'fast'. That said, you either need to use the revs a bit more before changing up or it's suffering from a dirty MAF. This sensor in the air intake might need a gentle clean up to give the ECU the right readings. Give it a try anyway, but nothing abrasive or too harsh. A small, soft paint brush ought to do it if necessary. :)
 
quickdraw said:
or since the n16 box is KNOWN to be SHITE.

you may have an issue there aswell
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Let's just correct a generalisation here - the 1.5 engine in the Phase 1 is known to have had timing chain probs & a weak gearbox - fact. However the Phase 2 N16 1.8's have been taken up to 250 bhp with stock gearbox & only an uprated clutch. They seem to manage just fine.
 
the bearings in the box are GASH - cheese wanks over these bearings

this aint a rumor! or generalization

this is me fixing at LEAST 5 n16 gearbox's a MONTH
from both the 1.5 and the 1.8 - be it more the 1.5, but still lots of 1.8
 
i havent had this problem in my 1.5 n16 but my 1.4 n14 suffered from this quite a bit. correct me if i'm wrong but when you put it into 4th the revs will obviously drop and hence the twin cam will stop running. This is what i've always put it down to.
 
Well lads, didnt really know it was a poor engine, the guy who sold it said he serviced it himself so maybe it needs a new air filter or something, seems like a really nice car otherwise, my gf is very happy with it!
 
Check/clean the MAF as suggested by Almeralseeper, change the air filter, then see if things improve :). If not I'm sure we'll have some more suggestions for you.
 
Dysopath said:
i havent had this problem in my 1.5 n16 but my 1.4 n14 suffered from this quite a bit. correct me if i'm wrong but when you put it into 4th the revs will obviously drop and hence the twin cam will stop running. This is what i've always put it down to.
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I hope not lol. Surely a mis type you can't believe this!
 
I think NNissan's asking what you mean by "the twin cam will stop running"

Twin cam means 2 cam lobes (acting on 2 valves) per camshaft per cylinder aka 2 x 2 x 4 or 16 valve.
 
The power 'band' starts at about 4000rpm, or it did in my 1.8. Infact there was a noticable kick in first gear when 4000rpm was reached. So perhaps try a lead foot approach?

Cheers,

Matt
 
I was lead to believe that a twin cam becomes active at (x) amount of revs otherwise you only have a single cam running. Meaning that when you are in 3rd running at 4000revs and you change to 4th obviously your revs will drop hence de-activating the second cam.
 
One cam does inlet valves, the other does exhuast valves, and run all the time.

Are you thinking of VVL? Something that the N16s dont have...
 
Im only going on information which I was given by the bloke i contract to who when i bought my N14 twin cam said i would regret it. He said that his MR2 was twin cam and was thirsty because it ran on 1 cam as standard and then after 3,500rpm (on an mr2) the second cam kicked in to give it more power.
 
Dysopath said:
I was lead to believe that a twin cam becomes active at (x) amount of revs otherwise you only have a single cam running. Meaning that when you are in 3rd running at 4000revs and you change to 4th obviously your revs will drop hence de-activating the second cam.
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Oh, you're thinking of VTEC where the cam is switched to a more aggresive one at 6000rpm. You're sort of right with the N16, the QG engine does have a mild version of that but its on the intake camshaft only and its at about 6000rpm, which isnt far off the limiter. (I'm not 100% sure about this, just what ive gathered)

http://en.wikipedia.org/wiki/Nissan_QG_engine#QG15DE
 
Dysopath said:
Im only going on information which I was given by the bloke i contract to who when i bought my N14 twin cam said i would regret it. He said that his MR2 was twin cam and was thirsty because it ran on 1 cam as standard and then after 3,500rpm (on an mr2) the second cam kicked in to give it more power.
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No mate that isnt true at all, I used to think this before I knew anything about engines etc.
Both cams are constantly working, unless the car has something like VCT, VVL, VTEC, VVTi then there is no change to make the 'kick' in power some cars feel like they have, its most likely to be everything starting to work in harmony and balance.
 
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