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91

Omega General Help / Re: Error codes 0170 & 0173

« on: 25 November 2008, 18:46:11 »

I drove about 2 miles to the petrol station this morning, stopped, filled up, paid and then as I started her up again the EML light had cleared itself.

Result! Must have been the MAF sensor.

As this happened I have greater confidence in the root cause and have moved the secondary O₂ sensors back to behind the main cats again.

Still no EML light despite a 20-30 mile drive since.

Touch wood, this could be the end of this thread.

92

Omega General Help / Re: Error codes 0170 & 0173

« on: 25 November 2008, 08:14:37 »

Keep is posted, as if the 0170-0173 codes stay away then a new MAF maybe the answer to my EML as well as Bob.dent as well, as he has the same problem (or at least I think he still does)................

Interesting about the learning bit, as if I reset the codes again, the car takes a bit of time to run normal, but a lot quicker than at Newent, probably cause all new sparks and DIS packs though

Ironically enough and unlike yours, resetting the DTC codes on mine made virtually no difference to how the engine ran in the very short term.

The car has always run sweet as a nut. I was getting the 0420 & 0430 which was the "tired pre-cat" message.

I moved the secondary sensors back to behind the main cats.

At around about the same time (entirely co-incidence, I am now led to believe) I started getting the 0170 & 0173.

But throughout this time the engine has run smoothly until last night.

Let's see how it copes with me and my right foot today.

93

Omega General Help / Re: Error codes 0170 & 0173

« on: 25 November 2008, 02:34:20 »

22 re starts, blimey! Presume its learning? I take it The car now ticks over as it should? And now goes like snot by the sound of it?

It's a bit of a slow learner, but it's good at PE

94

Omega General Help / Re: Error codes 0170 & 0173

« on: 25 November 2008, 01:45:38 »

Right the MAF sensor arrived today and I fitted it this evening.

The car started, then died again.
The car started, then died again.
The car started, then died again.
The car started, then died again.
The car started, then died again.
The car started, then died again.

The car started, splutttered, then died again.
The car started, splutttered, then died again.
The car started, splutttered, then died again.
The car started, splutttered, then died again.
The car started, splutttered, then died again.

The car started, splutttered, then stayed running, wouldn't react when I pressed the pedal at all, then died again.

The car started, splutttered, then stayed running, wouldn't react when I pressed the pedal at all, then died again.

The car started, splutttered, then stayed running, wouldn't react when I pressed the pedal at all, then died again.

The car started, splutttered, then stayed running, wouldn't react when I pressed the pedal at all, then died again.


The car started, splutttered, then stayed running, wouldn't react when I pressed the pedal at all, then suddenly the engine raced like crazy when I hit the pedal and covered my nice white garage door in black soot then died again.

The car started, splutttered, then stayed running, wouldn't react when I pressed the pedal at all, then suddenly the engine raced like crazy when I hit the pedal and covered my nice white garage door in black soot then died again.


The car started, splutttered, then stayed running, wouldn't react when I pressed the pedal at all, then suddenly the engine raced like crazy when I hit the pedal and covered my nice white garage door in black soot then died again.


The car started, splutttered, then stayed running, wouldn't react when I pressed the pedal at all, then suddenly the engine raced like crazy when I hit the pedal and covered my nice white garage door in black soot then died again.



The car started, splutttered, then stayed running, wouldn't react when I pressed the pedal at all, then suddenly the engine raced like crazy when I hit the pedal and covered my nice white garage door in black soot then managed to stay going.

I took it out for a run for about 50 miles and BL00DY HELL! it is like a different car. The pedal is so much more reactive than it was and you could almost feel it stutter before it went. By the latter half of the run it settled down and really began to run much better; it actually gives you a forceable shove in the kidneys when you floor it from 100.

I'll be down to clear the EML light tomorrow morning and keep you posted.

If that stays clear for a week then I'll revert the secondary lambda sensors to behind the main cats.

If that then keeps the dreaded 0420 & 0430 away after a couple of weeks I'm considering a set of standard 3.0 front pipes to remove the pre-cats altogether.

95

Omega General Help / Re: Error codes 0170 & 0173

« on: 21 November 2008, 19:56:36 »

http://www.omegaowners.com/forum/YaBB.pl?num=1226911441/15#22

Having just received a very welcome PM from Kieran, I have just ordered a MAF sensor for £33.50 which will be here this week.

That's £100 off what I thought was a good deal and £150 less than the retail price from Vx.

No bl00dy wonder they're called "stealers".

Thanks Kieran and Olympia what a STAR!

This seemed like such a good idea at the time, but despite reassurances that this would be sent so that it would be with me by recorded delivery on Thursday before 1pm, I still haven't seen hide nor hair of it.

I'm beginning to wish I'd just spent the extra money and had it done and dusted on Monday.

False economy? Perhaps not just yet considering the saving, but I'm not best pleased. If it isn't here ON Monday morning I'm canceling, expecting a refund and off down to the stealers.

96

Omega General Help / Re: Error codes 0170 & 0173

« on: 17 November 2008, 11:49:34 »

http://www.omegaowners.com/forum/YaBB.pl?num=1226911441/15#22

Having just received a very welcome PM from Kieran, I have just ordered a MAF sensor for £33.50 which will be here this week.

That's £100 off what I thought was a good deal and £150 less than the retail price from Vx.

No bl00dy wonder they're called "stealers".

Thanks Kieran and Olympia what a STAR!

97

Omega General Help / Re: Error codes 0170 & 0173

« on: 17 November 2008, 09:04:34 »

I just called my Vx stealers this morning and they have offered me one for £130 rather than the full retail of £180.

This rate is because they know me and always give me TC price discount rates on whatever I buy whether it is listed or not.

I'm just going to buy a new one out of frustration and to KNOW that it is fixed. It will be on my car by 2pm and the O2 sensors will be back behind the main cats as before.

I am doing this on the strength of the diagnostics work that Kevin did to Keiran's car this weekend.

I'll be driving to Leicestershire for a couple of days, so that should prove this one way or another. If it doesn't I wonder if I can take the MAF back as "unused"?

98

Omega General Help / Re: Error codes 0170 & 0173

« on: 16 November 2008, 20:16:29 »

I have been known to use Tesco 99RON fuel a few times. Do you reckon that it could have damaged (clogged up) the MAF sensor?

I always run on the Super Unleaded fuel and tend to use BP when I can.

EDIT: That was a really dumb question. Fuel can't clog an air sensor can it. Dolt!

99

Omega General Help / Re: Error codes 0170 & 0173

« on: 16 November 2008, 18:21:31 »

Either that or I could buy a new MAF sensor, go to TB, get the readings of kg/h at high idle (2400 rpm). If it is "faulty" then swap it clear the codes and retest. Should be good to go.

If not, then I can return the MAF sensor and get my money back, nothing lost.

If the MAF sensor is faulty I'll need a new one soon enough I reckon don't you?

100

Omega General Help / Re: Error codes 0170 & 0173

« on: 16 November 2008, 18:01:53 »

Interesting development on this today. Had a look at
Kieran's 2.6 for a gearbox and climate update and he mentioned that there had been some codes that he'd had problems getting rid of. Our old friends 0170 & 0173.

No obvious air leaks anywhere but fuel trim up to 24% on both banks.

To cut a long story short we eventually swapped his and my MAF sensors and the problem went away. The faulty MAF was reading only about 30/31 kg/h @ a fast idle (about 2400 RPM). The good MAF was reading 46/47.

Tried cleaning the faulty MAF to no avail anthough we didn't have a security bit to remove the element.

Don't suppose you can get your car to a Tech 2 / ELM reader and see what the MAF reads at 2400 RPM?

Kevin

That is a very, very interesting development. Thanks Kevin.

I can get my car to a reader, but they're going to charge me £50 for the privelige!

Now I know this, I am probably going to see when TB is about to nip over to Brackley for a quick read.

Where can I get the "security bit" you refer to? Do you think that it is worthwhile doing this cleaning of the element?

How much is a new MAF sensor? I may just bugger it and buy / fit a new one as I could spend as much diagnosing as fixing here.

I'm tempted to buy a new MAF sensor tomorrow 1st thing, fit it, get the codes cleared, get the secondary O2 sensors moved back to behind the main cats and drive it to Leicestershire this week to see what happens.

101

Omega General Help / Re: Error codes 0170 & 0173

« on: 16 November 2008, 08:58:01 »

Cheers Kevin. Given the reports on the garage vs. the mobile tuning mechanic what do you reckon?

Well, they both have hunches based on what they've seen before. The question is: will either of them go through a logical sequence of eliminating the possibilities or will they start replacing expensive parts based on hunches?

Is it six and two three's or do you reckon the mobile man is more on the nail having gone straight to the fuel system?

They both have identified possible issues which need to be investigated. We know MAF failures are rare on an Omega, and I've looked through your datalog again tonight side by side with a log from my car and I reckon the MAF signal looks OK. I might be wrong because I haven't compared logs from the same route, speed, driver, etc. but it's certainly not dead.

I think my money is still on something in the fuel supply - low pressure or poor delivery from the pump.

Kevin

Thanks as ever...

Is the "log" you talk about something that can be posted as meaningful information? Can mine and yours be posted? I'd really like to have them to show to whoever is going to look at this.

I plan on summarising this thread and having it all ready and printed out for their benefit as I think it will help focus their investigations and save me a little money. It will also help me to look a little less clueless and be able to hold my ground on the process and not let them take the mickey.

hope helps  

A lot, thanks also Chris

102

Omega General Help / Re: Error codes 0170 & 0173

« on: 15 November 2008, 18:34:50 »

Cheers Kevin. Given the reports on the garage vs. the mobile tuning mechanic what do you reckon?

Is it six and two three's or do you reckon the mobile man is more on the nail having gone straight to the fuel system?

103

Omega General Help / Re: Error codes 0170 & 0173

« on: 15 November 2008, 18:09:00 »

Is there a picture around of an engine bay with MAF sensor and related bits highlighted?

Even a picture of the MAF sensor itself would be useful. I've looked through the maintenance section.

104

Omega General Help / Re: Error codes 0170 & 0173

« on: 15 November 2008, 11:56:14 »

But any air leaks that could possibly be related if they are there at all would be downstream of the MAF sensor wouldn't they?

Otherwise the MAF sensor would be "aware" of the additional air going through it.

105

Omega General Help / Re: Error codes 0170 & 0173

« on: 15 November 2008, 11:10:02 »

Is the MAF the big metal block that bolts onto the front of the plenum?

If so I cleaned out the "MAF block" when I did the breathers whilst JamesV6CDX was doing the cam-belt and water pump.

I did touch stuff, but only with carb-cleaner, fingers and kitchen roll. I'm pretty sure I didn't break anything.

The breather, plenum and that metal block with the butterfly valves were like new when I (James) put it all back together.