5 Litre Ignition Module

vsv8berlinawag · #1 01-09-2008, 08:36 PM

Does anyone know where one can buy the transistor that sits on top of the module (and what to ask for i.e. part no, spec etc ?). I'm told that this is the part on these units that are prone to breaking down ???

vlv8vic · #2 01-09-2008, 09:20 PM

moved to proper area (twice -i stuffed up the first time!)

hako · #3 01-09-2008, 10:26 PM

I'm just guessing as I'm not familiar with the V8 but if its just a power transistor it will have an I.D. stamped on it and be available from Jaycar, but to replace the transistor you probably have to disassemble the module which is probably designed not to fixable....just a guess.

vsv8berlinawag · #4 02-09-2008, 12:03 AM

It is only held in by 3 solder points from the inside + the 2 nuts on top. Mine has 2 of the centre numbers missing from the stamp

Helicopter · #5 02-09-2008, 10:52 AM

If you cannot find the part number or its equivalent, a suitable replacement is the BUX-80 which Jaycar don't appear to stock [that was a great lot of help right?] or the MJ10012 Jaycar P/N ZT2222 for about $11. Its not a simple power transistor, and has a very high breakdown voltage rating with is necessary for switching the ignition coil.

Problem may be that the one on the module may be a PNP type polarity whereas the one's mentioned above are NPN polarity. The transistor polarity may be easily checked using a multimeter [I can tell you how to do this as its simple] but if its blown then obviously it can't. But the chances are in your favour as in all the electronic ignition systems I have either designed in the past or come across, the transistor used is an NPN type.

Alternativelly go to the wreckers and get a price for a second hand ignition module, as it may be cheap enough not to bother with all of the above hassles.

Good luck

Reaper · #6 02-09-2008, 10:59 AM

I have one for $100 if you are interested (whole module). Can see it working when you pick it up.

Reaper

vsv8berlinawag · #7 02-09-2008, 06:25 PM

Thanks Reaper, but mine is still working, but from what Helicopter is saying I'm keen to sus out the part and keep it handy as these modules are getting on in age now and hopefully when mine craps itself I'll try and replace the transisitor.

vsv8berlinawag · #8 29-09-2008, 08:27 AM

Quote:

Originally Posted by Helicopter

If you cannot find the part number or its equivalent, a suitable replacement is the BUX-80 which Jaycar don't appear to stock [that was a great lot of help right?] or the MJ10012 Jaycar P/N ZT2222 for about $11. Its not a simple power transistor, and has a very high breakdown voltage rating with is necessary for switching the ignition coil.

Problem may be that the one on the module may be a PNP type polarity whereas the one's mentioned above are NPN polarity. The transistor polarity may be easily checked using a multimeter [I can tell you how to do this as its simple] but if its blown then obviously it can't. But the chances are in your favour as in all the electronic ignition systems I have either designed in the past or come across, the transistor used is an NPN type.

Alternativelly go to the wreckers and get a price for a second hand ignition module, as it may be cheap enough not to bother with all of the above hassles.

Good luck

Can you please explain how to test the transistor to determine its polarity. I thought I had the problem licked as I went through the module and resoldered any joints that I could get to. The engine didn't miss a beat for about 3 weeks until last #%%## weekend!

Helicopter · #9 30-09-2008, 11:04 AM

Mate, are you located in Sydney?

Yep, I agree these modules are getting scarce, but the power transistor is not the only component that may go faulty or as in your case intermittent [I wish it was the case]

There is an IC inside which receives a signal from the fuel injection computer to advance or retard the ignition.

Anyway if your not in Sydney I will try to describe how to measure the power transistor.

vsv8berlinawag · #10 30-09-2008, 05:46 PM

No I live in sleepy old Adelaide. I did some checking at our Jaycar shop and found the transistor that you described, but it had only 2 connectors, where I am pretty sure mine had 3 ???. Any info would be appreciated....thanks

Helicopter · #11 02-10-2008, 10:20 AM

Quote:

Originally Posted by vsv8berlinawag

No I live in sleepy old Adelaide. I did some checking at our Jaycar shop and found the transistor that you described, but it had only 2 connectors, where I am pretty sure mine had 3 ???. Any info would be appreciated....thanks

OK, you got me ! Can you possibly describe this in detail? Since I can only see the top of the transistor, it looks exactly like a standard T0-3 package. If you look at page 101 of the 2008 Jaycar catalogue, on the right hand side of the page it shows what a T0-3 transistor configuration looks like. If your transistor has 3 pins sticking out the bottom then I have no idea what it could possibly be

. I have never come across a T0-3 transistor with 3 pins so I'll wait for your confirmation.

vsv8berlinawag · #12 02-10-2008, 07:15 PM

Here it is......

Helicopter · #13 03-10-2008, 09:45 AM

I have never come across a device that looks like a standard T0-3 transistor from the top but has 3 legs!

When you mentioned this I thought perhaps you had one too many beers, but clearly you are correct.

The only option remaining is to decifer the Delco part number assuming its still visible and try looking for this part on the internet. Anyway just post the part number and I will try to look it up, but I don't promiss anything