Hello and welcome! I'm Billy and i will assist you with this.
To me, it seems that the ECU program you have is causing this. As getting in limp home without any codes is not proper ECU operation.
Did you check the ECU program, maybe there's an update, a different version etc..?
Hi, sorry for the delay in replying - the ECU was checked and deemed not a problem. The boost limit was tweaked on the ECU and as per ususal nobody has been able to replicate the fault.
So the fault is no longer occuring? (as you are saying that it cannot be replicated)
The fault is still occurring - nobody else has experienced it. I've made sure that the engine is warmed up in the morning and done the normal trip into work and it goes into limp mode on at least one of the hills coming into the office. It didn't do it yesterday but this morning it did, 30mph, 4th gear, about 2000rpm (give or take) - I've just been out over lunch and tried to replicate it but it went fine - no problems. I'm running out of ideas and although the garage I bought it from is being very helpful and trying to fix it (thankfully still under warranty) I sense that they are running out of ideas too.
Sorry I missed you before
The hardest problem to trace would be the intermittent one.
And the fact its not registering any error codes
makes it that little more complex
We can narrow it down a little
It does seem to do it first thing in the morning and if the car has been standing for some time
The only thing that can be done for now (without replacing or checking parts at random), would be waiting for the problem to become more frequent, so it can be replicated, and then connecting a scan tool (diagnostics computer), and reading the live data while the problem is occuring, so the components (sensors, actuators etc..) can be monitored and the culprit confirmed, to replace accordingly.
only in the morning, just when you start it?
I start up and normally get it on the first hill on the way to work
If I crawl up the hill well under 2000rpm I'm okay
But then I get it on the second hill by which time the engine is warmed up
within 5 minutes of starting the vehicle?
If I go over 2000rpm pretty much yes
within 5 minutes of starting the vehicle? (max)?
I can start the car, reverse out of the drive and then straight up the hill - less than 5 mins
Thats on hill one, if its the second hill its probably about 10 mins
you get the problem most frequently on the first or second hill?
I only tend to get it on the second if I've not had it on the first
ok........i would check for a mild exhaust leak, before the turbo.... so the leak would be on the exhaust side, between engine and turbo. This would close when the exhaust warms up and metals expand.
Would this not trigger some kind error code?
It is worth a check...
and it will increase in frequency, as the crack widens....
Anything else beyond that it could be?
If the theory is correct.... it is logical, and would cause the exact same thing, but it needs checking and confirming.
beyond that, i would check the cylinders' compression, and check if you are not getting any mild leaks (from valves most likely), when engine is cold.
okay, is there anything I can look for to see if there's an leak?
on the exhaust side (between the engine and turbo), you can use a heat gun, or a smoke detector, when engine is cold... on the engine itself, only a compression test will give a clue...
I'm guessing a heavier load on the engine would cause this limp mode to kick in fairly quickly
hill number one is about a mile straight up and very very steep
Its just an ecu specialist had it for a couple of days this week in a similar rural area (doubtful as steep) and had no problems
exactly... the heavier the load, the more pressure you have in combustion chambers, and in exhaust....that is why a leak sounds logical...
its also parked on the street and not under cover, which I'm guessing will chill things a little more
it will... however, it would not add much to the problem if you already have a leak...
I'm just trying to factor out why other people haven't had the same issue
indeed, this is a good way of diagnosing, eliminating factors...
I have on occasion had it on the way back from work so again it will have sat outside for 7 hours but I either get the problem within five mins or about 10 to 15
which is actually about the same sort of time from leaving home in the morning
so it could explain both ways
indeed.... both (leak theories) are worth a check in my opinion... that's what i would do, if i had the vehicle...
I'll speak to them on Monday and also time it going in and coming out - see if it makes sense.
Thanks for your help
You're most welcome...
Best of luck... and get back to me if further assistance is needed on this....
Frustrating as it is, it is interesting.
Thank you for your trust! Get back to me if you need more assistance...Thank you in advance for the positive rating...http://www.justanswer.com/car/expert-billy/