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Old 06-15-2013, 07:56 AM   #1
diM3tri
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Cold start issues... Help!

I've searched a bit for this kind of thing but my situation seems a bit unique.

Whenever I get in the car and start it, middle of winter or middle of summer, the rpms start bouncing and bouncing all over the place from 500 - 2000 then when I give it gas a few seconds later it will stop. Occasionally it will just die. It almost seems like misfires. I was thinking it could be plugs but it drives fine after the first 2 seconds I start the car.. My SES light is also on.. But I think that's due to me removing my MAF sensor for my CAI


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Old 06-15-2013, 08:06 AM   #2
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The SES light tells you the ECU has detected a problem with your car.
Let it tell you what is wrong!!!
Get the stored codes read to start your troubleshooting.
Most Auto Parts stores will read the codes for you.
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Old 06-15-2013, 08:20 AM   #3
diM3tri
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Originally Posted by shanneba View Post
The SES light tells you the ECU has detected a problem with your car.
Let it tell you what is wrong!!!
Get the stored codes read to start your troubleshooting.
Most Auto Parts stores will read the codes for you.
Thanks, ill have that done for sure
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Old 06-15-2013, 09:22 AM   #4
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Have you checked sparks plugs or coils? I had the same problem, replaced all spark plugs and coils and problem was fixed.
Could also be an intake leak from cracks in the boots
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Old 06-15-2013, 09:30 AM   #5
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Re: Cold start issues... Help!

Why did you disconnect the maf for? You can have it hooked up even if you got a cai

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Old 06-15-2013, 09:32 AM   #6
diM3tri
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Why did you disconnect the maf for? You can have it hooked up even if you got a cai

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I think the CAI was messing with the MAF because when I had the sensor installed the car would stall when I turn it on. It wouldn't last more then a few seconds before dying. So I had to unplug it
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Old 06-15-2013, 09:43 AM   #7
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Re: Cold start issues... Help!

That my friend means your maf needs a changing. Remember not to buy anything but an oem one. You'll regret it if you ignore my caution. Thats only but the start of your problem now.

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Old 06-15-2013, 09:45 AM   #8
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Re: Cold start issues... Help!

And dont rule out your plugs. If you recently had to deal with a valve cover gasket leaking, or have a leaking gasket,oil has fouled the plugs causing misfires

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Old 06-15-2013, 09:51 AM   #9
diM3tri
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And dont rule out your plugs. If you recently had to deal with a valve cover gasket leaking, or have a leaking gasket,oil has fouled the plugs causing misfires

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I did my VCG about 3k miles ago. Ill go to autozone and have the codes read, pick up some new plugs, and then order a MAF eventually.
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Old 06-15-2013, 10:23 AM   #10
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Re: Cold start issues... Help!

Definitely would swap those plugs. I had a rough running car when only 2 of them were covered in oil

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Old 06-15-2013, 10:35 AM   #11
diM3tri
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Definitely would swap those plugs. I had a rough running car when only 2 of them were covered in oil

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I'm also getting 16.8 average mpg. And I barley ever push my car.
I shift around 3k always. And I always use premium. I should be getting way better gas mileage.
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Old 06-15-2013, 10:44 AM   #12
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Re: Cold start issues... Help!

Id also reset that mpg on the obc to get more of a current live reading to make sure if I was you. Mpgs could be a lot of reasons, the plugs being one of them. Check air filter,tire pressure, if you got over 100k on it then the o2s should be in the planning stage to eventually get it swapped out if you are keeping the car. My car gets 19-22 with mixed highway city, 14 with only city, and 25-26 with all highway. This was all done after running through a full tank under those conditions

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Old 06-15-2013, 10:49 AM   #13
diM3tri
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Originally Posted by NumbaOneNewb View Post
Id also reset that mpg on the obc to get more of a current live reading to make sure if I was you. Mpgs could be a lot of reasons, the plugs being one of them. Check air filter,tire pressure, if you got over 100k on it then the o2s should be in the planning stage to eventually get it swapped out if you are keeping the car. My car gets 19-22 with mixed highway city, 14 with only city, and 25-26 with all highway. This was all done after running through a full tank under those conditions

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Ill do the plugs for sure. Any recommendation on which brand/where to buy? I've got 135k on the dash. O2 sensors i wanna do in the future. I have a weird kinda strange bad smell coming from under the car after driving hard. So I assume my o2 sensors are part of this problem. O2 sensors and plugs ill do. MAF I have to wait on considering its expensive
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Old 06-15-2013, 11:11 AM   #14
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Re: Cold start issues... Help!

since the public eye is on me I must robotically tell you "oem all the way. Yay" with enthusiasm. I've read what others have used and my conclusion is what people have done makes sense. The cheaper plugs you buy,the sooner you have to change them. A guy even installed cheap $1 plugs but did admit he swapped them out after every oil change. Its up to you.



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Old 06-15-2013, 11:12 AM   #15
diM3tri
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Originally Posted by NumbaOneNewb View Post
since the public eye is on me I must robotically tell you "oem all the way. Yay" with enthusiasm. I've read what others have used and my conclusion is what people have done makes sense. The cheaper plugs you buy,the sooner you have to change them. A guy even installed cheap $1 plugs but did admit he swapped them out after every oil change. Its up to you.



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So should I just go to the dealer and get plugs? Any idea how much they'd cost?
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Old 06-15-2013, 11:19 AM   #16
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Re: Cold start issues... Help!

What kind of weird smell? Plus with o2s, don't buy genuine bmw. That could mean at least over $150 each. Get the Bosch ones by searching for the o2s not by your car but by the Bosch manufacturer part number. I forgot what they were but they work as good as dealership. Good part is they should only cost right around$50 each. If tight budget, at least get pre cat o2s done first.

Be careful of sellers like on ebay who wilk sell cheap counterfeit o2s. My first time I got from ebay I noticed they didn't even come with any original bosch packaging, Missing anti seize on threads, heat insulation around wire didnt cover all of it. I called them up and called them out on this. Got my money back and bought from another seller on ebay. I made sure he sent me it with original packaging or else I guaranteed hes going to hear from me and insured I'd get a refund and make him pay return shipping.

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Old 06-15-2013, 11:24 AM   #17
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Re: Cold start issues... Help!

I bought mine online. Oem ones originally for our cars was the ngk platinum quadruple spark nodes thingy. Forgot its technical name but google that. Its easy to spot them since they have 4 spark tips. Ive also bought the current oem ones they now use on bmws which are ngk ones as well but only have 1 spark tip thing. Couldn't tell the difference. People say the single tip could last around 100k miles before changing

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Old 06-15-2013, 08:38 PM   #18
diM3tri
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I bought mine online. Oem ones originally for our cars was the ngk platinum quadruple spark nodes thingy. Forgot its technical name but google that. Its easy to spot them since they have 4 spark tips. Ive also bought the current oem ones they now use on bmws which are ngk ones as well but only have 1 spark tip thing. Couldn't tell the difference. People say the single tip could last around 100k miles before changing

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Just got the codes read. 02 sensors! I also bought a set of NGK laser platinum plugs which ill do tomorrow. Turns out my dads Saab had been misfiring cyl 1 + 2 due to bad plugs for the last year and a half. Hahahaha he's been running on 2 cylinders and had no idea
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Old 06-15-2013, 09:12 PM   #19
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more than likely the pre cat o2s
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Old 06-15-2013, 09:16 PM   #20
diM3tri
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more than likely the pre cat o2s
Should I replace all 4? Or just pre cats?
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