Quote:
Originally Posted by S-Class Guru
Well, you're lucky, I'm not playing golf all week; so I'll help you research.
First thing would be to jump the fuel pump wires.
Without checking, I'm gonna assume your '90 is like my '91.
Look just to the right of the brake master cylinder; you should see a retangular box bigger than a pack of cigarettes.
It should say MAS on it, and have a big plastic wingnut on the top.
Turn the wingnut Counterclockwise all they way, and just lift the MAS relay out and put it in a safe spot.
The pins underneath are numbered, you want sockets 1&2, the big ones closest to the brake reservoir.
Find a thick piece of insulated wire, and carefully short out sockets 1&2.
Don't need the key on or anything.
The fuel pump should run.
If it does run, then chances are you have a bad MAS relay.
If the pump does not run, then you have a bad pump or wiring.
I'll do a bit of memory jogging and get back to you. Seems if I don't work on something for a few months, these days I forget the details. Just got my Medicare card, so I guess I have a good excuse.
Let me know if the jumper worked.
DG
|
Hello sir. Thank you for your reply. I'm going to have to pay you a retainer soon.
Well, I was reading a little more as I waited for someone to reply to this thread. I read about the MAS relay and it sounded like something I should look at. Well, I wanted to remove it, so I wiggled it just a little and lightly pulled up on it. Nothing. So, that little knob on the top of it looked interesting and I gave it a whirl. Turning that produced a sound in the left front of the engine compartment. I thought I had screwed up a factory setting and returned the knob to its original position the best I could. Nervous that I had made the situation worse I went into the car to see if the car would still at least turn over. It did better than that. It started right up! I let it run and started it a couple more times. It seems great.
So, what exactly did I get lucky with? What is the function of that knob on the top of the MAS relay?
Thank you in advance.