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Injector Help PLEASE~~ 1975 450 SL
Hello I have a nice old 450 SL W107 I have done just about everything imaginable to correct the gas consumption (above the regular useage as I know what these are used to eating) but I have a idea since this car basically sat for a few years that there may be injector issues. I have NO experience in this arena... Anyways the car starts up cold and runs like it is on 6 cylnders until she warms up. Once she is warm she does have what it takes-but it doesnt seem 100% more like maybe 95%. (I used to have the same car-and she ran lots better and wasted fuel, but not dramatically). So while driving when she is HOT, it seems like there is a hesitation but not like major-seems like it wavers alittle at speed, and then catches then loses like a small fraction of power but nothing that a novice would even notice. If you can please anyone let me know what you know I would be grateful. Once in a blue moon I can smell some gas like a flood situation...but while I have just got on it hard. This car has had the following done in the last month: New wires, new bosch correct non resistor plugs, new fuel filter and new fuel pump (all spec) I have replaced the air flow sensor, and maybe, just maybe cracked a connection replacing the wires on the distributer (it was moving when I took off the plug wire) and finally, once in a while she will do a deisel when I shut it off from warm. Would the timing be the reason if not a faulty injector? How do you know if an injector is shot or no good? I also ran some chevron techline in the tank and that day it ran like it was new. Thank you for any help!
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Timothy Evans TimEvans35@gmail.com CELL 310 990 6780 1985 380 SL 2010 CL 6.3 AMG *2009 CL 550 Sport 4matic New addition-1984 380 SE Newest Edition 1986 300E AMG |
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The issues that will have that car get the best mileage can't be established without an exhaust gas analyser. Later cars with feedback control can be monitored and adjusted electrically, but that car needs to run at 17in of manifold vacuum at idle with a CO reading of less than 1% at cruise.
This will probably mean jacking the timing up 5-10 degrees and adjusting the manifold pressure sensor. Unless you have a dyno, setting that criteria will require disconnecting the idle switch to disable the idle compensation circuit while setting to 1% CO or slightly less. It will then be necessary to reconnect and adjust the idle compensation on the computer to around 2% CO.
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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician |
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You have the classic symptoms of fouled trigger points.
I would remove the distributor, pull them out and clean them with a paper towel, then run a business card or index card through them!
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Current: 2021 Charger Scat Pack Widebody "Sinabee" 2018 Durango R/T Previous: 1972 280SE 4.5 2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi" 1999 Chrysler 300M - RIP @ 221k |
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wow really that sounds like the culprit! I am trying it tommorrow! Thanks! will report back!
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Timothy Evans TimEvans35@gmail.com CELL 310 990 6780 1985 380 SL 2010 CL 6.3 AMG *2009 CL 550 Sport 4matic New addition-1984 380 SE Newest Edition 1986 300E AMG |
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Hi Tim
do you have djet or cis. I know a 74 is djet and a 76 is cis but I'm not sure about 75. what Tom is saying sounds great for djet and I would suggest that first too but you talk about replacing your air flow sensor and this is on a cis not a djet (unless you mean your intake air temp sensor). can you just confirm which you have? cheers Barri
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61 Austin mini 67 Lotus 7 74 450sl 76 Cadillac 8.2l (501 ci) some new cars megasquirt conversion on: djet 74 450sl http://www.mercdjetmegasquirt.britautorepair.com/ cis 76 450sl http://www.merccismegasquirt.britautorepair.com/ the best view is always from the point of no return |
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