DJetronic website

[Matt@TheBend]

Hey guys,

while trawling the net for a little more enlightenment into all things Bosch, I came across this website. Im sure many of you have a better understanding of Bosch ignition systems that I, but this has helped me a bit.
http://members.rennlist.com/pbanders/djetfund.htm

By the way, would anyone be able to give me advice as to how i can pick up if the MPS on my 350SE is doing its thing? No noticable problems yet, but ive seen lots of mention about rebuilding MPS units... (pls excuse my ignorance)

cheers,

matt

[alabbasi]

I have never heard of them being rebuilt. I do know computers can be serviced.
Those MPS units can be found at junk yards and on ebay at a pretty reasonable cost.

[oscar]

Hi matt

Not a bad site is it.  I not long ago found I had a dodgy MPS. I had a 3/4 tear in my diaphragm and the car still ran but was jerky when I'd first accelerate.  A 2nd hand MPS cost me $150AUS and the difference was like a new engine.  Suddenly the car was smooth.

How far have you looked into that d-jet site?  Go to the bottom and click on back to home.   There's a truck load more info on it.  That site became my bible for a few weeks. Of particular mention try this page
http://members.rennlist.com/pbanders/manifold_pressure_sensor.htm for more info on the MPS.

Re repairing the MPS, I just did a search to try and find my old thread. Here it is.  I cracked open my MPS thanks to that first link and tried to repair it.  I too read somewhere about aluminium diaphragms being used as replacements but I think that was in rebuilt units. In other words you can't buy the diaphragm alone.  I gave up in the end and just bought a 2nd hand one. 

As far as my repair, I had plans of making a replacement diaphragm by building a stamp or press.  I got as far as getting some small rolls of copper to practice on and that's it.

To check the MPS, take the vac hose off and suck on the end and maintain the vac with your tounge on the end.  The vac should hold indefinitely.  You could get your vac guage/pump out but this was easier.  The only other thing would be to check the resistances of the 4 terminals on the MPS.  Deatils of that are in both those links above.

I hope your MPS is ok.  If not, do yourself a favour and replace it with a good one.  There was another thread about the improvements of a replacement concerning fuel usage and smoothness but I can't find it sorry.  Good  luck.

[Matt@TheBend]

Hey oscar,

Its taken me a while to really get to grips with all the tech stuff on this site, but some of it is finally sinking in. Pretty advanced system considering when it was introduced. Followed your thread too and ill be checking on the vacuum tomorrow. Seems that quite a few systems all depend on the manifold vacuum. Cheers for the advice and sharing, Styria's totally correct RE the value of this forum.

matt

[oscar]

Absolutely Matt,

If it wasn't for Denis and Nutz I wouldn't have diagnosed a faulty MPS.  Given the fact that around june or july this year I was posting  the question "what's an MPS", I've come along way in a short time thanks to the forum and web links.  I'm a self proclaimed d-jet man now, almost an expert .   
I even had an argument with a mechanic (not mine) a few weeks ago.  When talking about the merc he said, "they're the ones with the mechanical injection". 
"Nah mate, mines EFI d-jet!". 
"Nah! EFI came in the 80's mercs, 70's were mechanical"
"Nah mate, mechanical k-jet came in mid 70's bla, blah"

Boy it pays to go to a specialist independant.

[dudu]

Wow... those pages looks very very very interesting !!!

Thanks !