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Author Topic: 2.2 with P0170 code  (Read 5640 times)

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VXL V6

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2.2 with P0170 code
« on: 26 March 2009, 20:39:32 »
2.2 Petrol giving P0170 - Fuel / Oxygen Lean

Assuming Lambda but do the readings point to which one? The engine was up to operating temperature but note that the ECU isn't going closed loop.

Any thoughts?

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Welung666

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Re: 2.2 with P0170 code
« Reply #1 on: 26 March 2009, 20:44:20 »
Thanks again Andy for your time :y

I did notice along with them both showing open circuit the heaters were also active for both 02 sensors (I'm assuming that's connected) but it was up to temp with the fans kicking in several times.
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Proz

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Re: 2.2 with P0170 code
« Reply #2 on: 26 March 2009, 21:08:04 »
I had this not long ago , P0170 fuel trim lean exhaust ... never went into closed loop
Turned out to be the Maf even though it wasnt flagging a code for it  :y
« Last Edit: 26 March 2009, 21:08:53 by Mark38 »
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Welung666

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Re: 2.2 with P0170 code
« Reply #3 on: 26 March 2009, 21:11:01 »
Quote
I had this not long ago , P0170 fuel trim lean exhaust ... never went into closed loop
Turned out to be the Maf even though it wasnt flagging a code for it  :y

Did you just unplug it to test? How did you cure?
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mark.adams

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Re: 2.2 with P0170 code
« Reply #4 on: 26 March 2009, 21:11:54 »
Whats the price of a lambda compared with MAF, change the cheapest one first and see if you get lucky
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Proz

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Re: 2.2 with P0170 code
« Reply #5 on: 26 March 2009, 21:16:05 »
Quote
Quote
I had this not long ago , P0170 fuel trim lean exhaust ... never went into closed loop
Turned out to be the Maf even though it wasnt flagging a code for it  :y

Did you just unplug it to test? How did you cure?

Yeah i unplugged it and it made no difference to the running of the car .
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Proz

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Re: 2.2 with P0170 code
« Reply #6 on: 26 March 2009, 21:17:54 »
Quote
Whats the price of a lambda compared with MAF, change the cheapest one first and see if you get lucky

i got a new genuine maf on ebay nice and cheap... i belive they are around £90 on Tc when i called my local dealer .
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Welung666

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Re: 2.2 with P0170 code
« Reply #7 on: 26 March 2009, 21:18:16 »
Quote
Quote
Quote
I had this not long ago , P0170 fuel trim lean exhaust ... never went into closed loop
Turned out to be the Maf even though it wasnt flagging a code for it  :y

Did you just unplug it to test? How did you cure?

Yeah i unplugged it and it made no difference to the running of the car .

I'll have a play when I get home tomorrow lunchtime :y Ta matey :y
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VXL V6

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Re: 2.2 with P0170 code
« Reply #8 on: 26 March 2009, 21:18:33 »
When your MAF was faulty did the car struggle to idle for a second or two from a cold start or act as if it was missing at higher revs
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Proz

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Re: 2.2 with P0170 code
« Reply #9 on: 26 March 2009, 21:21:18 »
Quote
When your MAF was faulty did the car struggle to idle for a second or two from a cold start or act as if it was missing at higher revs

It did splutter for a second or two ... there was no missing at high revs but it did feel hesitant between 3000 - 4500 revs .
Big improvement when i put the new maf on , got its power back again  :y
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VXL V6

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Re: 2.2 with P0170 code
« Reply #10 on: 26 March 2009, 21:25:41 »
Sounds about the same then.

Could do with a known good MAF to prove really.

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Re: 2.2 with P0170 code
« Reply #11 on: 26 March 2009, 21:32:41 »
Yes that would certainly help .... i dont think my O2 readings looked like yours though , but im also suffering the cat efficiency code aswell .
But ive never seen the P0170 code since changing the maf and that must be a month now  :y
« Last Edit: 26 March 2009, 21:34:27 by Mark38 »
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VXL V6

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Re: 2.2 with P0170 code
« Reply #12 on: 26 March 2009, 21:38:49 »
I'm also a bit confused about the Lambda's producing that 'flatline' output, here's a snap of the four on my old 3.2...



Which is what I'd expect to see
« Last Edit: 26 March 2009, 21:40:14 by VXL_V6 »
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Welung666

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Re: 2.2 with P0170 code
« Reply #13 on: 27 March 2009, 05:45:05 »
MOT exhaust readings for the curious:-

1st fast idle test:-

RPM 2845 Pass
CO 0.003 Pass
HC 34 Pass
Lambda 1.340 Fail

2nd fast idle test:-

RPM 2750 Pass
CO 0.001 Pass
HC 6 Pass
Lambda 1.320 Fail

Natural idle:-

RPM 808 Pass
CO 0.002 Pass
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Marks DTM Calib

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Re: 2.2 with P0170 code
« Reply #14 on: 27 March 2009, 08:23:52 »
What was the coolant temp reading?


It not lambda sensor as the ECU is reporting it as open loop control!

Also, what was the throttle position reported to be and the inlet air temp?
« Last Edit: 27 March 2009, 08:24:57 by Mark »
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