Daily Driver with old electric fuel injection system? - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 02-25-2015, 11:15 AM Thread Starter
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Daily Driver with old electric fuel injection system?

I was looking at some older Mercedes from the late 60's early 70's. A Mercedes expert told me he would not recommend using older Mercedes as a daily driver because of the old electric fuel injection system. He told me I'd be much better offer getting a late 70's early 80's model. Is their something wrong with their old fuel injection systems. If I could guess I bet its the difficulty and cost to fix them if they break. These cars last like tanks though, what are the chances of it breaking down all the time on you. The model in question was a 1974 w-116 450 se. I was also looking at a 1974 w-115 240d and not sure if they have the same problem.

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post #2 of 10 (permalink) Old 02-25-2015, 01:43 PM
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My opinion is that many mechanics don't like working on those systems, but overall they are amazingly reliable and competent *assuming nobody has monkeyed with it*!!! By that I mean well-intentioned folks go dialing things up or down in an attempt to fix some other issue that's affecting the way the car drives or runs. If the FI is working, leave it alone, if it's broken, have it fixed properly then leave it alone. So in the end, I would say if the cars you're looking at are properly adjusted and running within specification, go for it. Having said that, the systems can be expensive to fix but it really depends on what's wrong. Did it really fail or is it just way out of adjustment? Is it one small component or the whole thing was abused/neglected? If it does need work it will cost you dearly, but the same is also true of carburetors on lots of cars today, fewer guys who know how to handle them properly is pushing costs higher for repair work. I always pick the car or system I want then try to find a good example of it to suit my needs.
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post #3 of 10 (permalink) Old 02-25-2015, 02:30 PM
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I'd say the idea of a 40+ year-old daily driver is an iffy one, regardless of the induction system type.
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post #4 of 10 (permalink) Old 02-25-2015, 02:42 PM
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The 115 240D would be preferable as a daily, if only 'cause it's such a dirt simple car with few features to fail, and the diesel injection system requires no electrical consumers to function.
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post #5 of 10 (permalink) Old 02-25-2015, 07:19 PM
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My 108 was almost a daily driver and I took that thing all over hell and creation without a problem.
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post #6 of 10 (permalink) Old 02-25-2015, 09:33 PM
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Quote:
Originally Posted by Mercedes Lover View Post
I The model in question was a 1974 w-116 450 se.

D-jetronic Lessons:
- Points wear down and if you don't know how to gap the points and set the timing roadside you could be stranded. Pertronix (eliminating the points) is the solution, or at least carry a spare set of points. I once had the rider break off, and had to call AAA around 2 am for a 1 hour tow home. By the time the tow truck got there, I figured out the problem and that I had left my spare points at home. Always carry spare points if not using pertronix.
- hot start issues. Higher fuel pressure, keeping tank full, and turning the key to circulate fuel before starting is the solution.
- fuel pump relays fail intermittently. Smart to carry a spare fuel pump relay (or jumper) to assure this bigger doesn't leave you stranded.
- trigger points can get dirty, and other expensive parts are wise to collect as spares in case you need them. They are wise investments as their values are not declining.

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post #7 of 10 (permalink) Old 02-26-2015, 07:40 AM
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The engine wiring harness is a source of trouble. The wiring has been exposed to heat for many years, and becomes brittle. Sometimes the wires break. I don't think you can get wiring harnesses for 4.5s any longer.

Also, you have to know how to fix it yourself. Very very few shops have any sort of expertise and no one seems to want to learn.

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post #8 of 10 (permalink) Old 02-26-2015, 08:28 AM
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Originally Posted by ctaylor738 View Post
The engine wiring harness is a source of trouble. The wiring has been exposed to heat for many years, and becomes brittle. Sometimes the wires break. I don't think you can get wiring harnesses for 4.5s any longer.



Also, you have to know how to fix it yourself. Very very few shops have any sort of expertise and no one seems to want to learn.

so...

1) make sure the engine wiring is not a mess before purchasing, and keep an eye on it, and be gentle with it. I never had any issues with any of the wiring in the three 4.5 I owned. I sold the d-jet harness from the one I parted for $150. It was pretty much perfect other than missing a few rubber boots.

2) you need to learn and DIY on these cars (in general). It's virtually hopeless throwing money at a mechanic for a daily driver on one of these.

.

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post #9 of 10 (permalink) Old 02-27-2015, 02:55 AM
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There is a company that will build an EFI harness with all new wire that is concourse correct for about $800.00
Some of the other engine components are very expensive too...

The best thing you can do is buy a well documented and well cared for car. The more money you spend up front should yeild less problems and expense down the road.

I currently drive an 1986 560SEL as my daily driver. I've been luck so far but I do have some issues. Cold start, so so idle, dry rubber bits, broken plastic window slide and some wood delamination... Nothing major but annoying, all from a 29 year old car....

---------------------------------------------------
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post #10 of 10 (permalink) Old 03-02-2015, 12:20 PM
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Quote:
Originally Posted by Mercedes Lover View Post
I was looking at some older Mercedes from the late 60's early 70's. A Mercedes expert told me he would not recommend using older Mercedes as a daily driver because of the old electric fuel injection system. He told me I'd be much better offer getting a late 70's early 80's model. Is their something wrong with their old fuel injection systems. If I could guess I bet its the difficulty and cost to fix them if they break. These cars last like tanks though, what are the chances of it breaking down all the time on you. The model in question was a 1974 w-116 450 se. I was also looking at a 1974 w-115 240d and not sure if they have the same problem.
76 or newer 116 450se that will have cis and they dont have to much trouble
a efi v8 i would stay away from they are finicky and very few people know how to fix them correctly
i would not hesitate to drive a car with mechanical fuel injection no matter what the year i might just stay away from old efi systems and i have lots of experiance with them thats what was around when i started working on them in the early 80s

current stable
2010 glk350-86 300e-88 300e white-88 300e blue-66 220seb-74 230-89 560sec white-91 560sec taupe?-92 300te-83 380se parts car- 2012 chevy cruze eco wifes commutor 40plus mpg on regular. 1970 gmc 2500- 2002 gmc 2500hd duramax/allison-50s something willeys pickup- 74 scout-88 jetta karat-74 harley fxe-92 harley flhtcu ultra classic-95 harley road king-96 harley fatboy-98 special construction harley powered.- 2011 klx250 and to many off road vehicles and coming soon 69 280sl
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