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Discussion Starter · #1 ·
First of all, greetings to all from Spain. This will be my first post on the forum, after finding it very useful for a long time.

The reason for it is that I have lately been feeling my 2001 330Ci to be slower that it's supposed to. Timed a few 0-60 runs and it is giving me a consistent result around 10seconds.

Spark plugs are new, oil and filter too. Just bought a fuel system cleaner to see if I notice any difference. Next on my checklist will be air filter, fuel filter, and if that doesn't get me close to 6 I'll go for the pump. After that, I'll check O2 sensors. That's the plan.

Do any of you guys have an idea of what could be so wrong that is taking 4 seconds out of a 0-60(dont say the driver, I'm not that lame :). Any other ideas?

I live in Madrid, with an elevation of 2000ft and daily Temps of around 86F. I guess that plays a role, could it be such a big one?

Thanks a lot guys.
Sergio
 

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2003 330ci manual
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1,429 Posts
First of all, greetings to all from Spain. This will be my first post on the forum, after finding it very useful for a long time.

The reason for it is that I have lately been feeling my 2001 330Ci to be slower that it's supposed to. Timed a few 0-60 runs and it is giving me a consistent result around 10seconds.

Spark plugs are new, oil and filter too. Just bought a fuel system cleaner to see if I notice any difference. Next on my checklist will be air filter, fuel filter, and if that doesn't get me close to 6 I'll go for the pump. After that, I'll check O2 sensors. That's the plan.

Do any of you guys have an idea of what could be so wrong that is taking 4 seconds out of a 0-60(dont say the driver, I'm not that lame :). Any other ideas?

I live in Madrid, with an elevation of 2000ft and daily Temps of around 86F. I guess that plays a role, could it be such a big one?

Thanks a lot guys.
Sergio
Does your car burn oil? I had a ZHP that got beat in a race by a 300k mike 323i auto! I was mortified. After replacing plugs, MAF, fuel filter, fuel pump, coil packs, 02 sensors, cam/crank sensors I was still not any better off. Then I installed eBay headers......come to find out my cats were 80% clogged. All the oil my ZHP burned had fouled the cats. After the headers the car went from losing to an auto 323 to a 5.7ish 0 to 60. It was a monster (relatively speaking). That’s my guess. Good luck!
 

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Discussion Starter · #4 ·
Does your car burn oil? I had a ZHP that got beat in a race by a 300k mike 323i auto! I was mortified. After replacing plugs, MAF, fuel filter, fuel pump, coil packs, 02 sensors, cam/crank sensors I was still not any better off. Then I installed eBay headers......come to find out my cats were 80% clogged. All the oil my ZHP burned had fouled the cats. After the headers the car went from losing to an auto 323 to a 5.7ish 0 to 60. It was a monster (relatively speaking). That’s my guess. Good luck!
It does, and that is actually a very good idea. I'll check that out. Just one thing, how would changing the headers improve the issue?
My guess would be to change the rings and check the cat, probably change it after.
 

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Discussion Starter · #6 ·
The first step in diagnosing a problem is to scan the engine computer (DME in BMWspeak) for codes. The Service Engine Soon light is on only when an emissions related code is present. How much oil is the engine using?
OK, I'll take it to the shop so they have a look at that, as I don't have one myself. It was using around 1 liter per 1000km (600 miles) until I replaced the ccv and valve cover gasket, now consumption is much lower but still happening
 

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Oil consumption unless very egregious wouldn't slow a car down significantly, at least not to the extent you report.
(If that's you in the right seat? Your EPR hasn't changed that much from oil. There's likely something else amiss.)

Will headers help, well yes, but if there's another issue correcting that FIRST will yield better results.

Most are successful with cleaning the rings with the right additives and oil to restore ring function.
 

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'04 330Cic | '03 Touring 330i 5sp Swap
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It does, and that is actually a very good idea. I'll check that out. Just one thing, how would changing the headers improve the issue?
My guess would be to change the rings and check the cat, probably change it after.
I think he's saying that if you're burning oil, the burnt oil is traveling out the exhaust side of the engine into the manifold and clogging the catalytic converters. If those are clogged, you're choking the engine (and also likely not meeting emissions). Headers would obviously help, but new manifolds would too, if you're not into extra pollution.

That being said, I dunno that we're talking 4 seconds slower in a 0-60mph level of slower. If your VANOS is not working, that would slow things down for sure.
 

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Discussion Starter · #9 ·
I think he's saying that if you're burning oil, the burnt oil is traveling out the exhaust side of the engine into the manifold and clogging the catalytic converters. If those are clogged, you're choking the engine (and also likely not meeting emissions). Headers would obviously help, but new manifolds would too, if you're not into extra pollution.

That being said, I dunno that we're talking 4 seconds slower in a 0-60mph level of slower. If your VANOS is not working, that would slow things down for sure.
Thanks to all for the ideas, I'll check on that too. Regarding emissions, I don't think that a problem. Passed my vehicle tec inspection a month ago and emission levels were surprisingly low, so I would rule the catalizer issue out then.
 

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If the car has clogged cats, it absolutely will slow the car down substantially. In my case the headers eliminated the problem and that’s why I enjoyed the results I did. But even if you put replacemeant cats on it, if they aren’t clogged then it bring it back to normal power levels. Also, my car had NO CODES, so a DME scan won’t always show the problem.
 

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First of all, greetings to all from Spain. This will be my first post on the forum, after finding it very useful for a long time.

The reason for it is that I have lately been feeling my 2001 330Ci to be slower that it's supposed to. Timed a few 0-60 runs and it is giving me a consistent result around 10seconds.

Spark plugs are new, oil and filter too. Just bought a fuel system cleaner to see if I notice any difference. Next on my checklist will be air filter, fuel filter, and if that doesn't get me close to 6 I'll go for the pump. After that, I'll check O2 sensors. That's the plan.

Do any of you guys have an idea of what could be so wrong that is taking 4 seconds out of a 0-60(dont say the driver, I'm not that lame :). Any other ideas?

I live in Madrid, with an elevation of 2000ft and daily Temps of around 86F. I guess that plays a role, could it be such a big one?

Thanks a lot guys.
Sergio
Sounds like loss of power from VANOS.
How you done the dual vanos upgrades?
 

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emission levels were surprisingly low, so I would rule the catalizer issue out then.
Flawed logic here. Don’t assume anything. Instead test, check, and go from there.

An exhaust back pressure test is the proper method, but a quick and simple test for clogged cats is removing both pre-cat O2 sensors and having a short drive. If normal power returns, you have clogged cats.
 

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Discussion Starter · #13 ·
Thanks again for the ideas guys. I noticed my secondary air pump is missing, and I'm running a 2001 year model. Shouldn't that be in my engine? I understand they removed it in 03 and later models. Wouldn't it somehow affect the engine?
 
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