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Discussion Starter #1
Hi all, my 2012 Astra H (A16XER) is a little hard to start, no matter cold or warmed up. It always need a couple of cranks more than it supposed to. If I leave it more than a day without driving, the first minute it runs rough, almost stalling and bouncing the revs up and down. That being said, the biggest problem is the poor acceleration. If I press the acc pedal (even in first) it doesn't pull like it supposed to (it's a 115HP so I expect a little more power). The acceleration lags in any gear and what intrigues me the most is if I floor the pedal, almost nothing happens, but if I try to ease off, there is a sweet spot with noticeable "pull" in any gear. Also, below 2k if I let go off the acc pedal, almost always I get some kind of jerking. I have cleaned the contacts on the acc pedal, cleaned the UEC but no improvement so far. I also removed the VVT solenoids filters (they were clean though). Over the last year, the car had it's oil and filter change (regular servicing), changed spark plugs, coil, thermostat + housing and fuel pump. Hope that someone will have some suggestion.
P.S. No codes are showing in torque app or using the gas/brake method (I don't have access to opcom) and the car is not losing oil or coolant.
 

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The torque app though useful isn't up to the job of extracting manufacturer codes,
if there are no codes stored(and that needs confirming with opcom or tech2) then you need something on it that will allow you to study live engine data .
 

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Discussion Starter #4
Thank you mate, just needed some pointers, if there is anything else I could do before taking it to the stealers.
 

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Where are you located,i don't recognise the flag on your registration ?
 

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Are the exhaust gases getting away? could be a restricted cat converter.
Have you checked the engine temp reading on the scanner and the hidden menu?
 

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Discussion Starter #7
Don't, just don't start with the name :D...
It's North Macedonia, formerly known as FYRO Macedonia, formerly known as... You see where this is going, right? :)
 

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Ak ok,don't you have any decent Vx specialists or Bosch service centres around,i'd probably go that route rather than a dealer
 

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Discussion Starter #9 (Edited)
I don't think it's a restriction in the exhaust part, since the car is getting and running fine in the 3k+ range but I could be wrong. It gets there pretty slow to be honest, even when stationary but there are no jerks, just the standard "holding back" feeling and uneven acceleration. It's a bit tough to explain, hope you get it.
EDIT: About the engine temp, it warms up nice and normal and stays on 90C (I had the thermostat and housing changed and they fitted 90C TS, instead of 105C).
 

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Discussion Starter #10 (Edited)
There is nothing decent over here mate, trust me. I bet the main technician at the dealers doesn't even know how to use Tech2. I went to a couple of "reputable" technicians and they all said that the car is fine. They came to that conclusion by just driving the car for couple of minutes. One of them "cleaned" the TB with some agent and started the engine without it even drying up. Needles to say, the car run like [email protected] for a couple of minutes. When I said that that could ruin the cat and I don't appreciate that he did that, he gave me the keys and said "I see you have more knowledge and experience than me, so go ahead and find the problem yourself". We are still stuck in that period when vehicles were repaired mainly with hammers...
 

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If it's holding back when revving stationary,you could whip out the pos 1 lambda and run it to see if it's more responsive,
is it definitely an A16XER and not a Z ?
i can't see that as an option in the Astra H just the J.
 

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Discussion Starter #12
It's not holding back when stationary per se, but the revs are going up pretty slow in my opinion.
BTW, it behaves the same warmed up and cold. Is the lambda signal taken into consideration when the engine is cold?
As for the engine, it's definitely A16XER.
 

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The lambda removal is to allow the gasses to bypass a potentially blocked cat,just to see if it helps,
if you have an endoscope it's possible to have a look inside,
although it's more use for when the cat has broken up and is missing.
I'm not convinced about the engine lol
just for my curiosity could you post the vin so i can check exactly what we're looking at.
 

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Got the vin,you're correct (y) it's just me being a forgetful **** 🤣
 

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Discussion Starter #15
I've sent you a PM with the VIN mate.
About the cat, what are my options if it's blocked, apart from replacing it or running a straight-through?
 

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Discussion Starter #16
Can this be a MAP related problem and where can I find the damn thing on this engine? Is it behind the inlet and below the ECM? About the lambda removal, do I must have the special removal tool or is there some other way to remove it?
 

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yes you'll probably have to remove the ecm and the map is just underneath in the manifold,
that's where live data can help,it may be reading perfectly ok,
you don't necessarily need a special socket for the lambda but they can make it easier
 

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Discussion Starter #18
Thank you both for the suggestions, I'll try to get my hands on on an opcom, or try what you proposed and I'll get back if there is any findings.
 
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