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Old 07-02-2017, 02:25 PM   #1
Starvega
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Low end power problem

My 323 is down on power after replacing the head gasket. It runs and idles smooth a quiet but under 3000rpm it just doesn't have the power it used to, and it has a throaty intake sound. The are no stored codes and I've checked everything over many times and i just can't find anything wrong. The only hint i have is a pending p1520 code but it won't store it and it clears every time i shut the car off. I took the exhaust vanos solenoid off and cleaned it, the piston, and inside the vanos unit where it goes. I didn't see even a spec of dirt in there but i figured it was worth a try. No change. Cam position sensor is less than a year old, but the code is for the "actuator" anyway.
The only thing i can think of is maybe i messed up when i set the vanos upon reassembly? Would it be this noticeable if it was off by a little bit?
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Old 07-02-2017, 02:48 PM   #2
armenh7
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I think either DISA or vanos.
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Old 07-02-2017, 04:41 PM   #3
Starvega
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I rebuilt the vanos around January this year. The disa looked fine visually and doesn't make any noise. I haven't tested it though
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Old 07-03-2017, 03:59 PM   #4
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With the exhaust vanos solenoid unplugged, low end power seems to be back to normal. I didn't have time to drive it that much but it was good for the 10 minutes i did drive it. I'd rather have the cel on for a disconnected solenoid than have the power loss problem.
Still curious what would cause this? I might have to take the vanos back off and set the plungers again, i cant think of anything else it could be other than that i didn't set it right.
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Old 07-03-2017, 05:31 PM   #5
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Old 07-03-2017, 06:41 PM   #6
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Quote:
Originally Posted by Starvega View Post
With the exhaust vanos solenoid unplugged, low end power seems to be back to normal. I didn't have time to drive it that much but it was good for the 10 minutes i did drive it. I'd rather have the cel on for a disconnected solenoid than have the power loss problem.
Still curious what would cause this? I might have to take the vanos back off and set the plungers again, i cant think of anything else it could be other than that i didn't set it right.
Doesn't that sort of point to the vanos?
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Old 07-03-2017, 10:22 PM   #7
Starvega
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Doesn't that sort of point to the vanos?
Yes it points directly at the vanos obviously. But vanos what? Solenoid? Seals again? Timing problem? It's a fairly simple system, the whole thing doesn't just "go bad", but i dont know exactly what needs to be done to it.
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Old 07-03-2017, 10:24 PM   #8
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Originally Posted by Starvega View Post
Yes it points directly at the vanos obviously. But vanos what? Solenoid? Seals again? Timing problem? It's a fairly simple system, the whole thing doesn't just "go bad", but i dont know exactly what needs to be done to it.
Neither do I, sadly. We just have to wait for others now.
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Old 07-15-2017, 08:59 AM   #9
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Hi all,

not creating new thread - I have as I would say issue with my bmw power (e46 325ci manual). It runs fine (no check engine light, engine stalling, rpm fluctuation ect), but I feel that it has less power than it should have. I have measured 0-60 mph time with Torque app - 9.8 secods is the best time (while my e91 330dA had 7.6 doing without gas/brake start). 9.8 secods is way too slow for the car.

To illustrate see how it is going 80-120kmh (it is total sadness)...

40-140 kmh is the same sh...


I wear 224/40 and 255/35 R18 tires, 10w60 oil, all filters are changed, new spark plugs and there are no mechanical issues as far as I know. There is some noise in intake manifold, fuel pump is giving some noise.
What I should pay attention?
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Old 07-15-2017, 08:28 PM   #10
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Noise from that intake?
Probably your disa valve. That can cause low end power problems.
They do go on these cars.
Rebuild the disa from a kit from G.A.S German auto solutions.
Just do a quick search on this.
Hope this helps.
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Old 07-15-2017, 08:29 PM   #11
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Also 10w60 is not the right oil.
I'm just pointing this out.

To each their own.


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Old 07-15-2017, 08:43 PM   #12
Starvega
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Mine pulls way harder than that video kalvis posted. Mine is just occasional low power at low rpm. Usually after idling for a while at a stop light or something. High revs are fine, pulls like normal.
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Old 07-15-2017, 11:13 PM   #13
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You could be off by one tooth on timing.

I did a head gasket once and had a cam position sensor error. New sensor did not fix it. I reworked the timing backwords to reset the timing and fixed the error.
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Old 07-16-2017, 12:29 AM   #14
Starvega
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It's nearly impossible to set the timing chain wrong on these since it's just set to a general range. The vanos timing however, is really easy to set wrong. I'm pretty sure thats what happened. I don't have time to take it back apart right now though and i need to get ahold of the tool again. Its barely noticable with the solenoid unplugged. I can live with it for the time being.
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Old 07-17-2017, 03:28 PM   #15
Kalvis_325
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Quote:
Originally Posted by domza2 View Post
Also 10w60 is not the right oil.
I'm just pointing this out.
[/URL]
I had some track days, therefore such oil is used. for winter I will run 5w30.
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Old 07-17-2017, 03:34 PM   #16
Kalvis_325
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I have also thoughts on disa or vanos valve, since at the end it has almost no power... During test drive while purchasing it I felt some boost in power at the end (5000 rpm till 6000 rpm) and it was surprising for me, but it had some rattle/small jerking in the middle, and the seller solved problem in the middle and after that high end power was lost. I dont know what he did...

Also while pedaling there is some like vacuum.air going out noise (I think from disa). Is it normal?

Last edited by Kalvis_325; 07-17-2017 at 03:34 PM.
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