Date registered: Jan 2009
Vehicle: 1970 280 sel, 1979 300sd, 1988 300sel
Location: Santa Monica, CA
Mentioned: 0 Post(s)
Quoted: 10 Post(s)
w108 1970 280sel
Own a 1970 280 SEL and drove it to a reputable MB shop (whatever that means) to check out why my car has been running rich. I previously posted information on my car not having the original M130 engine or head. I currently have an M129 engine and head. I have the correct distributor(cap and rotor) that goes with my engine. I had previously checked the cold start valve and that seemed ok. The MB tech called me today and asked if anyone had played around with the screw at the back of the injection pump and I said "No way". I told him that my engine was rebuilt about 9 years ago and the shop owner had told me that they had only played around with the Air/Fuel mixture screw/knob.
The tech continued to tell me that someone had turned the screw all the way in and he was having trouble backing it out. Again, I repeated to him that as far as I knew, nobody had messed with it. I continued to tell him that I also knew that the screw can never be adjusted when the car is on. He said he had big hands and was a little blind (not kidding, could of been a sarcastic remark) and could not really see what else was going on behind the injection pump but it would be a great idea to remove it and see what was going on. He also said that he had worked at a shop that rebuilt the bosch pumps many years back and was familiar with what to do. He gave me 2 options:
1. Remove the injection pump and take it in to get it rebuilt or calibrated for 1,500 dollars with parts and labor, or
2. Remove it and see what was going on and then reinstall for 800 dollars.
I swore that I would never get ripped off again so now I'm posting this to get advice on what to do and what not to do. So far there is no charge for anything that they have done which is really only playing around with the cold start valve , WRD, throttle plate?, venturi air fuel mixture, distributor etc.
What easy test can be performed to check the injection pump. The mechanic did not mention anything being broken at the back of the injection pump but just said he could not back out the enrichment/leaning screw out.
I don't know much about injection, obviously, but it just seems like way too much money to just see if it works or to just remove and repair the injection pump. Where is Arthur Dalton?
Last edited by xaliscomex; 08-28-2012 at 07:14 PM.