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Author Topic: 2.2 rough idle when cold  (Read 10088 times)

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Omena

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2.2 rough idle when cold
« on: 25 February 2016, 15:46:41 »
Not allways.

Seems appeared like this: i start cold engine in morning,  no problem.  I drive 60miles and go work.  After 2-4hours i start and idle goes about 1500 but then shifts 1400-1300 and is rough about 2-4seconds and then is stable 1300-1200 and  then drops normal and works fine.

I get "My Naff Code Reader" back later so i just think ask for now what can cause that? Warm engine is okay.
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Omena

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Re: 2.2 rough idle when cold
« Reply #1 on: 27 February 2016, 12:16:09 »
Now it does with cold engine : revs 2000 and then drops 1300 and swings little time and then drops normal.

And warm engine engine light appeared and code p0420.
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tunnie

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Re: 2.2 rough idle when cold
« Reply #2 on: 27 February 2016, 12:19:00 »
Are you loosing coolant?
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Omena

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Re: 2.2 rough idle when cold
« Reply #3 on: 27 February 2016, 14:10:47 »
No. Im watching coolant and oil every week because i drive about 400-600miles week.

Dont you say that those are first symptoms for head gasket?  :-X
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05omegav6

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Re: 2.2 rough idle when cold
« Reply #4 on: 27 February 2016, 15:58:44 »
Does it improve with the MAF sensor unplugged :-\

If yes, then you need a new MAF sensor... only buy genuine or Bosch :y
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Omena

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Re: 2.2 rough idle when cold
« Reply #5 on: 27 February 2016, 18:15:58 »
I try that.

Intake temp is ok and all values when i checked with "My Naff Code Reader".  That cold start "issue"  is gettin worser every time but its very fast so its not big problem yet.
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Omena

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Re: 2.2 rough idle when cold
« Reply #6 on: 28 February 2016, 12:08:17 »
With maf off,  it was pretty same but stumbles second just after start. 

Feels like little misfire that little roughness in cold.

Maf voltage is good also. No codes
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JoeRadosavljevich

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Re: 2.2 rough idle when cold
« Reply #7 on: 28 February 2016, 16:00:01 »
Check the spark plugs and see what colour they are.
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Omena

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Re: 2.2 rough idle when cold
« Reply #8 on: 29 February 2016, 10:10:50 »
Plugs were fine. No marks for oil or coolant deposit and all four were identical.

Trhottlebody was very dirty and valvecover to throttlebody hose was cutted off.


When i get that little hole open in throttlebody then lets have a look.  Does someone know what size that hole is?  Wire or needle wont go thru it seems to be very dirty.
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Omena

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Re: 2.2 rough idle when cold
« Reply #9 on: 29 February 2016, 19:32:27 »
 I got the hole open.  Seems fine now but i try tomorrow over night.
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K_V6

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Re: 2.2 rough idle when cold
« Reply #10 on: 29 February 2016, 20:00:23 »
How is the egr? Clean it and try again
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Omena

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Re: 2.2 rough idle when cold
« Reply #11 on: 29 February 2016, 22:45:13 »
I check that.  If its bad,  can i block / disconnected it or does engine need that /fault codes?
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Omena

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Re: 2.2 rough idle when cold
« Reply #12 on: 01 March 2016, 08:00:28 »
Btw cold idle roughness is gone!

Is that normal when you start on freezing temperatures,  idle revs about 2000 rpm then goes 1400 like normal?
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JoeRadosavljevich

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Re: 2.2 rough idle when cold
« Reply #13 on: 01 March 2016, 11:01:11 »
Quote from: Omena on 01 March 2016, 08:00:28
Btw cold idle roughness is gone!

Is that normal when you start on freezing temperatures,  idle revs about 2000 rpm then goes 1400 like normal?

I suspect two things, mine 2.0 4 cylinder had the same problem.
1) Idle Air Control Valve needs cleaning
2) significant vaccum leak

good luck
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Omena

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Re: 2.2 rough idle when cold
« Reply #14 on: 01 March 2016, 12:06:50 »
Ill do those checks too

Cold engine no problem but now aftee 3h stand it was little roughness again but revs was 1500 max not 2000. But idle is not that rough than before cleaning.
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