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Wobba
20-04-2008, 16:22
Car runs but idles very high. Opened ECU today and found this:

http://i174.photobucket.com/albums/w102/barneywobba/My%2016V/DSC00400.jpg

http://i174.photobucket.com/albums/w102/barneywobba/My%2016V/DSC00399.jpg

You can see scorch marks on the cover there, and one of the circuits has quite badly blown on the motherboard. Seen this before??
stan
20-04-2008, 17:10
cant really make anything out from those pics tbh.

are you sure you havnt just got an airleak?
Wobba
20-04-2008, 17:59
This may highlight it a bit:

http://i174.photobucket.com/albums/w102/barneywobba/My%2016V/burntboard.jpg

My phone camera is shit, sorry.

I have checked and used jubilee clips on any of the pipework that may be leaking. One nut on the inlet manifold is not done up, as it's so hard to get too, but undoing other nuts has made no difference and the otehrs are all on tight.

I can hear no air sounds at all when i start the car, other than ISCV. When ISCV is blocked is instantly stalls, at mo it is idling at 2.4k revs. It should idle at 900/1000 rpm which is a heck of an air leak if it is one.

Cleaned ISCV 3 times thoroughly.

Checked sensors.

Car has been exposed to elements for some time and we have had some very wet weather, ECU could have gotten wet, and blown.
stan
20-04-2008, 18:15
yeah could be the case...try another ecu?

ive got a couple kicking about if you want to buy one...
BristolSam16v
20-04-2008, 18:19
As stan said only thing to do really, is try another ecu see if it works.
Wobba
20-04-2008, 19:04
yeah could be the case...try another ecu?

ive got a couple kicking about if you want to buy one...

PM'd!
northy
20-04-2008, 20:37
if its just a capacitor u can get it fixed?
schakal
20-04-2008, 21:18
if its just a capacitor u can get it fixed?

will probably cost near enough the same getting it
soldered etc and still will leave you in doubt whether the
actual board has any other damage .

i would scrap that and get a working ecu .
eternalife
20-04-2008, 22:40
^^^ Agree with the Jackal.
Could always take Matteh up on his offer too.
Wobba
20-04-2008, 22:41
I am used to dealing with blown parts on my PC and I've seen this sort of thing before. I'm just gonna get another complete one. I think the capacitor is ok, but theres another bit which has split open and molten metal seems to have seepeed through the crack.
Wobba
20-04-2008, 22:45
One concern is if something else has caused it to blow up...
stan
20-04-2008, 22:47
most likely moisture has caused it to trace accross part of the board.
stan
20-04-2008, 22:47
most likely moisture has caused it to trace accross part of the board.
Wobba
21-04-2008, 10:47
Yea, thats what I reckon. Hopefully, a change of motherboard will sort it once and for all!

It's got me to thinking though...is it worth sealing up the ECU box with Silicone or a bag after removing as much moisture as possible first? It just seems like it isn't waterproof the way it is now.
Purple
21-04-2008, 10:59
Most probably it's the multi-leg component that is attached to the heatsink. Scorch marks on cover appears to be over the heatsink (which might be normal), but is there actual damage on the component itself? Can't see anything, take a better picture and post it up here. Get yourself a freeze spray to test on that spot, some times overheating can cause these components to hang.
Wobba
21-04-2008, 12:42
Sorry, my mobile is not very good at closeup pictures :(

The scorch marks are not just from high temperature over time, they are as if ther has been a sudden flame, much like if you hold your hand over a candle thats a bit smokey if you see what i mean?

You can see there, just, one of the pins is darker than the others and around there the plastic has melted as has some of the metal inside one of the plastic cover things. It's overheated and gone bang.

It's all academic now, as I will be replacing it anyway!