[davidtranlds]

Hi everyone,

Name's David from the land down under.

I've recently purchased a used Holden Cruze 2012 SRi-V JH Series II, 1.4L turbo petrol.

I had a check engine light come on, but after some driving, it went away.

Day or two later, it came on again and now it's permanently on whilst I drive.
I had also refueled with Unleaded 95 (manual says to use 91 but 95 also worked for a little extra performance), not sure if the light returned after or before I used the 95, but recently received my OBDII reader and that's how I got the code above.

I noticed the STFT would be around the -3% to +4% when idling, but LTFT would be around +30%.
When accelerating and driving/cruising, they'll both float around the -5% to +5%, sometimes going up to +10% depending on when I'm accelerating or decelerating heavily, or something, too random for my basic knowledge to pinpoint.

I do notice when I come almost to a stop, STFT jumps to around +15% then drops back down again once I've stopped, or start accelerating again.

I did some basic troubleshooting, tried the water spray method but I think it was too windy or something.
Anyways, tried the purge valve and when the car's on idling, there's suction, so I believe that's one problem.

But based on the above STFT and LTFT details, could there be anything else?

Thanks

 

[ChevyGuy]

In the US, the weak point of these cars is the PCV system which tends to fail. I'd suggest reading the pinned threads on that topic. A P0171 is one of the codes it can throw.

 

[Valpo Cruze]

For the American Chevy Cruze it seems that the P0171 and P0420 seem to have been factory installed on these things. I have been chasing the P0171 on my daughters Cruze for way too long. Shows up when I am busy and can't look at it and then it goes away on its own and when I scan it I can find nothing wrong with it.

 

[davidtranlds]

That's always the case ain't it?
Can never detect the issue when you want to for troubleshooting xD

I'll look into the PCV as well.

The dealership I bought it from said they'll organise someone to take a look so we can get it sorted this week, free under the 3 month warranty.

We'll see what happens

 

[davidtranlds]

Been watching a few more videos and reckon I need to check my MAF sensor also.

Is there a list somewhere of what all my ODB2 readings should be sitting on?

Like in the video I watch, for a Toyota car, the guy mentioned having his MAF(g/s) in the 2-3 range, preferably higher 2s to 3 range.

What should the Holden Cruze be?

Similarly, O2 sensor around 3.3, for the 14:1 fuel ratio.
How about the Holden?

So stuff like that, a table that lists what all the standard values should be to know what's in range and what isn't?

Thanks

 

[72chevman]

Check hose between the air filter and the throttle body for cracks. Lazy people will bend that hose when checking or changing the air filter. This will allow in unmetered air causing a lean condition.

P0171 fix

I've been fighting with a P0171 code than comes and goes. Finally found a crack in the air tube between the air cleaner and the throttle body. This messes the mass air flow sensor readings. I do all my own maintenance, but take my car for it's yearly alignment at a chain store where I bought a...

www.cruzetalk.com

 

[davidtranlds]

Thanks for the tip 72chevman
Will have a look today, should have some time.


Also, got the other valve replaced at the dealership where I bought the car, typical small dealers, they replaced with a second hand part.
Nevertheless, LTFT idles around an average of 11% now.

An improvement at least will continue checking for more possible leaks and whether the replacement itself might need a replacement of its own lol

 

[Xnitro67]

i had this last year was about go in for it but i found the clamp came loose on the hose. i was like that shouldnt be that loose lol anyways i tightened it and gone but i did replace them regardless

 

[davidtranlds]

I'll give it another check - everything seemed tight first quick check I did.

Something I noticed, for LT averages 11% on idle.
After some driving, it might eventually average 4% or so.
But may sometimes go back up to 11%, or even more, after some time, then back down again.
So on consistency yet, but generally on the 11% and lower side.

So hard to say if the replacement valve is on its way out also, or if there's another leak.
Will have to ask the mechanic to do a smoke check when I bring it in for service.