My unkown long term problem (with car)

[Colin Wiltshire]

Well, I Know we have been through this before, many parts have been changed, but the problem is still here.

The problem is sudden running extremly lean, engine running roughly, the car kangerooing, ( even going down hill, foot not on throttle) unwilling to rev unless I bury my foot, that is fine (apart from my 2nd issue, which I think is spark blow out)
On cold start, the very 1st time you try to move, the revs keep dieing, then after a second or so, it's fine. Even then after a 25-30min drive it can appear.

On hot/warm start, even before moving, the afr is at 22.5 and the engine is not at all happy, sometimes after 10 or so mins, it seems fine again.

I have put in the oem 02 sensor, after just having the wideband (now both, but just the oem feeding the ecu, wideband is just monitoring on gauge only), standard engine temp sensor changed for brand new, new Walbo fuel pump, new fpr (ebay job), new knock sensor (diff issue, needed doing) got new plugs NGK I think without looking, 1 step colder), 3 new coil packs, new down pipe (old was leaking, though could be part of this issue),

I was told at last RR day, that the engine is healthy, it's the sensors around it. That was before changing the knock sensor.

I wonder if injectors, crappy fpr could be to blame? but why intermittent?

Trying not to, due to cost, A trip to @Eurospec again, they couldn't find the problem last time. Because it didn't do it while with them.

Hope to get the TB sensors checked while at RR day soon.
Any ideas?
Would be nice to get back to the 1 and only time leaving Area 52 2 years ago the car ran beautifully at 340bhp (just for the drive home ofcourse)

[elnevio]

I would send off all six injectors to be flow-tested and ultra-sonically cleaned. Somewhere like www.injectorcleaning.co.uk does this for about £100, including replacement of seals, filters, etc.

[Colin Wiltshire]

I would send off all six injectors to be flow-tested and ultra-sonically cleaned. Somewhere like www.injectorcleaning.co.uk does this for about £100, including replacement of seals, filters, etc.

I have 6 spare, would they be able to sort out stuck open injectors?

[Confused]

A cheap/rubbishy fuel pressure regulator could cause issues - the ECU expects a specific pressure, and uses this to determine how long the injectors should be open for - fluctuating fuel pressure will affect this.

I always find mine lumpy on hot restart - I think it's inlet air temperature compensation.

Have you been able to log via EvoScan whilst these issues are occurring? You don't need an expensive cable - I used a £10 VAG-COM KKL cable from eBay for years, and it's fine for just logging.

Post up some logs, and we can take a look at them and see if anything looks untowards.

I'd be looking in the logs for items like throttle position, waste gate duty cycle, injector duty cycle, AFR (hoping that you've got the 5v output from the wideband hooked up to one of the spare 0-5v inputs as listed in the definitive ECU pinout thread), Load, airflow, barometric pressure, inlet air temperature - as well as many more sensors and outputs, to see exactly what's going on.


Without logs, we'd be just guessing, really.

A cheap Windows laptop/tablet and a cheap cable will allow you to log, which will be absolutely invaluable.

[adaxo]

I would focus on FPR too, especially if its aftermarket one, I would revert everything back to stock inc pump, if changed, and all pipes involved in fpr then see if thats change anything.

[Confused]

My Anglia had been running like crap when I busted the throttle position sensor. Not entirely sure whether that's the MAP-ECU or the OEM ECU that's causing it, but now I've fitted a new one, it's running better again.


That'll reiterate my point from earlier, logs with EvoScan

[foxdie]

One quick thing you can try is this;

1. Unplug the MAF sensor
2. Undo the soft pipe that connects to the hard plastic intake elbow (making sure to put the jubilee clamp someplace safe)

The car will run badly when you do this, but it should run and be drivable.

If the car runs better, then it's a sensor or a tune problem. If it stays the same or gets worse, it'll be fuel delivery related.

Wish I lived closer or I'd gladly help out.

[Davezj]

I will bring my FPR down with me as i removed it to swap my car back to factory fueling to test an issue i was having with short term feul trim. it was nothing to do with the FPR so i can fit this to colins car to see if it make a differerence.

i will have a look at his AFR gauge as well as i am not convinced it reading correctly.
i had an issue with my AFR gauge not so long ago and it was the sensor itself that had gone faulty and it was showing lean then rich then lean without any change in the actual fueling.

[Nick Mann]

Evoscan could pick that up if it was logging both lambda sensors. Not enough to know if the wideband is a little out but plenty to know if the wideband says lean whilst the narrow band says stoichiometric.

[elnevio]

I have 6 spare, would they be able to sort out stuck open injectors?

They can do, if you look at their website. It's my feeling that regularly cleaning injectors every few years should be considered a service item anyway.

Plenty of other ideas on here though!

[Colin Wiltshire]

Have you been able to log via EvoScan whilst these issues are occurring? You don't need an expensive cable - I used a £10 VAG-COM KKL cable from eBay for years, and it's fine for just logging.

They all say OBD2, Are these still ok to use as I know we are not obd 2 friendly.
http://www.ebay.co.uk/sch/i.html?_fr...able+&_sacat=0

[elnevio]

Yes. You still have to short pins 1 and 4 though.

[Davezj]

They all say OBD2, Are these still ok to use as I know we are not obd 2 friendly.
http://www.ebay.co.uk/sch/i.html?_fr...able+&_sacat=0

colin the top one on the list will do for less than £5 and it has the driver CD with it and it is a UK seller so instant delivery no waiting 15-25days delivery.
it is a no brainer.

[Confused]

You can have my cable for £5 if you want - I know for a fact it works with Windows 10 (both 32 bit and 64 bit) and EvoScan 2.7, and saves you needing to modify a new one from eBay.

I won't be needing it now I have an OpenPort cable.

[Davezj]

Everybody should have evoscan and VAGcom diag cable. The is no reason for anyone not to have them.
Most people have a laptop of some description these days.
The software and cable can be bought for about £25
Probably one of the cheapest diag solution that is truly interactive like evoscan.


Sent from my space-aged gizmo

[Colin Wiltshire]

You can have my cable for £5 if you want - I know for a fact it works with Windows 10 (both 32 bit and 64 bit) and EvoScan 2.7, and saves you needing to modify a new one from eBay.

I won't be needing it now I have an OpenPort cable.

I will take it off your hands then Garry, I'll bring my laptop up to the RR day,(it's running windows 7) it has Evoscan on it, but I was never able to get it to work.

[Davezj]

I will take it off your hands then Garry, I'll bring my laptop up to the RR day,(it's running windows 7) it has Evoscan on it, but I was never able to get it to work.

you will need the cd with the divers on for the cable to make it work as evoscan has old FTDI drivers bundled in with it and they get installed with evoscan you have to install the cable drives after evoscan is installed. w

well this is what i have alwas experienced.

[Confused]

Bring it all with you, Colin, and I'll get it up and running on your laptop

Then, we can go for a run up the road, see what's happening and make some recommendations.

(If not with your laptop, then with mine and my OpenPort cable!)

[Colin Wiltshire]

Bring it all with you, Colin, and I'll get it up and running on your laptop

Then, we can go for a run up the road, see what's happening and make some recommendations.

(If not with your laptop, then with mine and my OpenPort cable!)

Cool, that sounds like a plan. As Dave said, does the setup disc come with it?

[Davezj]

I have a driver disc so I can copy it on to your laptop so you can install them whenever you need them.


Sent from my space-aged gizmo