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[zirk]

Interesting information regarding the Fuel trims but how would I go about seeing the figures to be able to advise you as to what they are?

Car came to a complete standstill on the A2 last night, misfire got so bad that the car was struggling to run and pull its own weight up a slight hill. Its seriously over fuelling as well, I drove roughly 20 or so miles last night and managed to use just over a quarter of a tank! It's popping and banging on gearchange almost like the car has anti-lag! Okay might not be to that extreme but that's the best example I can think off to explain what is happening.

It's been suggested to me that because I have altered the air intake system the car is drawing in too much air now and the MAF can't monitor it's enough to adapt the Fuel Settings? And to make matters worse I meant to be driving to Cornwall on holiday on Monday morning so I've now got to try and sort out a doner or hire car!!

In that case, refit the old induction system and see if that cures it

You would need to change the Maf as well in order to completely prove.

I have used K and N before in Omegas and other cars including my Cossie, never had any issues at all, but I do tend to keep the Filters quiet dry' ish.

[P6UL K]

Chris the K&N was fitted straight from the box, was oily but not excessively

[Andy H]

Interesting information regarding the Fuel trims but how would I go about seeing the figures to be able to advise you as to what they are?

If you have an Android phone get a bluetooth OBD adapter (Bluetooth OBD)for about £15 and download the pro version of ScanMyOpel from the google play store (£6.99)

If you have an Apple phone it won't work with bluetooth so you would need a more expensive wireless/IP adapter. (I don't know what software is available for Apple but I am sure someone here will know)

[zirk]

Chris the K&N was fitted straight from the box, was oily but not excessively

You up my way at all this weekend Paul?

[P6UL K]

Interesting information regarding the Fuel trims but how would I go about seeing the figures to be able to advise you as to what they are?

If you have an Android phone get a bluetooth OBD adapter (Bluetooth OBD)for about £15 and download the pro version of ScanMyOpel from the google play store (£6.99)

If you have an Apple phone it won't work with bluetooth so you would need a more expensive wireless/IP adapter. (I don't know what software is available for Apple but I am sure someone here will know)

I have an iPhone but the woman has a Galaxy Pad so I'll use that, those Bluetooth OBD things reliable?

[P6UL K]

Chris the K&N was fitted straight from the box, was oily but not excessively

You up my way at all this weekend Paul?

Probably not mate as at work all weekend, why do you ask?

[zirk]

Chris the K&N was fitted straight from the box, was oily but not excessively

You up my way at all this weekend Paul?

Probably not mate as at work all weekend, why do you ask?

Could read the Codes with a cheapo reader, dont have many 3.2 spares but I need to put one of my 3.2's back on the road for Monday, dont mind temporally swapping Maf or other bits etc, to see if it helps.

All depends how often your fault pops up really.

[P6UL K]

Thanks Chris but to be honest I just won't have the time to be able to get up to you and I'm not sure I really want to drive the car any amount of distance for fear of breaking down or making any potential problems worse

[Andy H]

Interesting information regarding the Fuel trims but how would I go about seeing the figures to be able to advise you as to what they are?

If you have an Android phone get a bluetooth OBD adapter (Bluetooth OBD)for about £15 and download the pro version of ScanMyOpel from the google play store (£6.99)

If you have an Apple phone it won't work with bluetooth so you would need a more expensive wireless/IP adapter. (I don't know what software is available for Apple but I am sure someone here will know)

I have an iPhone but the woman has a Galaxy Pad so I'll use that, those Bluetooth OBD things reliable?

There are lots available. All seem to be made in China. Some are stupidly cheap and don't work reliably.

The one I bought cost about £15 and does work. The best advice I can give is to read the reviews of the product & vendor before you place your order.

[P6UL K]

Cheers Andy, I did just all that on Amazon and found quite a good one for under £10 which is now winging its way to my home

[zirk]

Thanks Chris but to be honest I just won't have the time to be able to get up to you and I'm not sure I really want to drive the car any amount of distance for fear of breaking down or making any potential problems worse

No worries mate, offers there if you change your mind. 

[P6UL K]

Just had the codes read, there was:

P0100 - Not detected
P0110 - Not Present
P0420 - Intermittent
P0170 - Intermittent
P0173 - Intermittent

Also watched throttle pedal and the % were accurate enough for the foot position but the load was showing idle then straight to Full Load at low to medium pedal position %'s

Anyways codes cleared and car took for a short run, misfire still persists so left car to be looked at while I'm on holiday next week.

[Andy H]

Just had the codes read, there was:

P0100 - Not detected
P0110 - Not Present
P0420 - Intermittent
P0170 - Intermittent
P0173 - Intermittent

Also watched throttle pedal and the % were accurate enough for the foot position but the load was showing idle then straight to Full Load at low to medium pedal position %'s

Anyways codes cleared and car took for a short run, misfire still persists so left car to be looked at while I'm on holiday next week.

P0100 Mass or volume air flow circuit high input
P0100 Mass or volume air flow circuit low input
P0100 Mass or volume air flow circuit range/performanceProblem
P0110 Intake Air Temperature Circuit High Input
P0110 Intake Air Temperature Circuit Low Input
P0170 Fuel trim malfunction (Bank 1)
P0173 Fuel trim malfunction (Bank 2)
P0420 Catalyst System Efficiency Below Threshold (Bank 1)

All points to MAF imo. Was the odd engine load reading with the engine running? That would be an extra pointer to the MAF being fubar.

[TheBoy]

OK the P0100 and P017x (all should show on pedal test, BTW) point to a buggered MAF, and the trims cannot compensate enough for it (based on the feedback from the lamdas).

Shove the original airbox/filter back on, and a known good MAF, reset the trims (or clear the codes, which will reset trims), and run it like that for a few weeks to ensure it behaves. Then consider putting the K&N back on if you really want to, though personally I wouldn't.

[P6UL K]

*Slight update...

I'm still on my hols but my mechanic had reported that a replacement MAF has been fitted, car is still almost undriveable! All codes cleared and no new ones are being produced which is bloody odd!! And very frustrating! 😩