Hi Guys,

Local Honda garage seem to have FINALLY done what I've been requesting for months and investigated all sensor readings that might be causing the misfire

After 'resetting everything' the car is fine right up to the point when the Air Pump kicks in - then it all goes shitty again

So, what does the Air Pump do and does this give anyone any clues about why it's misfiring?

As far as I'm aware the car hasn't recorded an error code specific to the pump - just a cylinder misfire.

Cheers,

J

 

I might be wrong but I thought the air pump was supposed to shut off not long after you start the engine. AFAIK It's onlt supposed to supply air for about 30 secs (something to do with emmisions).

 

There's a primary and secondary pump. Primary one ensures the car cas still breathe / idle when the throttle is closed (foof off the accel pedal) Air is pumped in via a seperate feed into the TB.

The secondary one is for emissions on startup and stops after about 30 secs.

Are the air lines from the primary pump clear? What did Honda say?

MB

 

Local garage are contacting Honda today - I'll, hopefully, have more info later this afternoon.

 

Hi Guys,

Local stealers have been speaking to Honda UK and their 'final' decision is that the engine wiring loom and BOTH oxygen sensors will need replacing - at a cost to me of around

 

I'd stick with you line that you reported this fault during warranty period and therefore you are covered by warranty for any repair.

Just because they couldn't find the fault initially doesn't mean that it didn't exist and you were in warranty when you brought this to Honda's attention.

If that fails you are entitled to a repair under the Sale of Goods to Consumers act 2002

Pdf fact sheet

 

It would be very unlikely its both the ECU and the sensors IMO! This is an easy way out for me, and I can almost see their odd logic here. Change a load of stuff and it will work again...

For example, if the primary oxygen sensor is duff then the secondary will pick it up meaning you may "think" you have a fault on both. This indeed would cause erratic off VTEC behaviour, particularly at idle. However, if you had a dodgy loom this may cause the erratic signals from / to the lambda and be the root cause, not the sensors.

I would want to hear their logic and how they tested things. You could ask them to rule out the oxygen sensors by replacing them on a no win no fee basis

When you mentioned about the air pump thing above, when the pump turns off, the lambda sensors are just about kicking into life IIRC - so that would tie up with your problems

Have you got any more info on how they diagnosed the loom / sensors? it certainly wouldnt be uncommon for either fault, its just unlikely it would be all the above together IMO. And the sesnors cost about

 

After successfully sueing Priory Motor Group for the engine failure in my S I'm all too aware of these rights

 

I spoke to Honda UK about this last week. I was concerned that I was going to be paying money for their guess work.

Their reply was 'tough'. But we might be able to help you out with costs on further parts if that doesn't fix it.

Yet again, quality service.

 

This 'Trigger's Broom' approach is lazy & stupid:

IIRC, the L-sensors can be either bypassed or 'swapped' for one that works.

I'd eliminate them first.

If that fails to cure the problem, check the loom for resistance wire by wire, if necessary. It's usually the plugs taht corrode, not the wires themselves. Even removing, WD40ing & re-plugging could fix it!