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#1
11-02-2012, 01:18 AM
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Car not accelerating properly, and cutting out
Sometimes on my car on the highway, the car sort of cuts out for just a quick second, then is fine. Maybe 30 minutes later, same thing. I thought maybe the turbo was going.
Today, I was driving in the moutains on a 12 hour drive to PA, and had trouble going up some of the steeper and longer inclines! I've driven those roads many times with no problems, and today, the car just couldn't do it. The roads are 60-70 mph, and (cough) 40 mph is all I could do! The car was just dying. Again, I thought it must be the turbo going, but I called my mechanic, he said it sounded like a fuel issue, maybe a clogged injector or something After the high part of the mountains, already doing 40 mph, I was going on a slight DOWNHILL, and the car was having trouble accelerating! So I thought, can't be the turbo. Must be a fuel issue after all. If I REALLY step down on the pedal, it will then accelerate more like it normally does, but there's obviously something wrong with the car. I changed the pre-filter and main filter a week ago (the engine cutting in and out was happening prior to that), and cleaned the injectors directly 2 years ago. Any other guesses or possible solutions? 1991 300d 175k 
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#2
11-02-2012, 02:17 AM
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Answer
It should be one of the following issues.
* If you filled the fuel tank today, possible BAD fuel. 2 stroke oil and/or Diesel911 may cure this. Diesel owners need to know fuel data Diesel owners need to know fuel data - PeachParts Mercedes ShopForum Warning ALL Diesel Owners http://www.peachparts.com/shopforum/diesel-discussion/309367-warning-all-diesel-owners.html#post2841158 * Plugged fuel tank strainer. Bad fuel or infestation.. Algae/Fungus fixation... Algae/Fungus fixation... - PeachParts Mercedes ShopForum Biobor, what is it, why do I need it??? Biobor, what is it, why do I need it??? - PeachParts Mercedes ShopForum Filters, Fungus, Biocide, etc. Filters, Fungus, Biocide, etc. - PeachParts Mercedes ShopForum Algae Clogged Filter Pic StarTron WORKS ! Algae Clogged Filter Pic StarTron WORKS ! - PeachParts Mercedes ShopForum Changing the Fuel Tank Strainer on a Mercedes Diesel Episode 1: Changing the Fuel Tank Strainer on a Mercedes Diesel - YouTube Check out this fuel pickup screen Check out this fuel pickup screen - PeachParts Mercedes ShopForum W123 Fuel Tank Screen Replacement W123 Fuel Tank Screen Replacement - PeachParts Mercedes ShopForum * Massive air leak into the fuel system. The fuel thermostat plastic end O-ring leaking is a common issue. Braided fuel lines weep. 1984 300TD turbo Braided fuel lines weep. 1984 300TD turbo - PeachParts Mercedes ShopForum OM601, 602. 603 Diesel fuel thermostat REBUILD parts list * Massive vacuum in the fuel tank. A bad vent valve will do this, remove the filler cap and test drive. What is this valve and why is it dripping diesel? What is this valve and why is it dripping diesel? Fuel tank vent pictures + location 93 300D 2.5L Turbodiesel Power Loss What happens when a tank vent gets clogged. What happens when a tank vent gets clogged. - PeachParts Mercedes ShopForum Imploded fuel tank - so sad! Imploded fuel tank - so sad! Why do I have vacuum in my diesel tank.....................? Why do I have vacuum in my diesel tank.....................? - PeachParts Mercedes ShopForum * Fuel bypass valve failure. 6010700146 Diesel fuel return valve/banjo bolt * A broken steel injector line. OM602.962 Steel injector lines W124.128 300D Turbo 1990-1993 * Lift pump failure. Test output volume. Lift pump MB# 0000902650 * Injection pump delivery valve seal failure. OM60_series IP delivery valve reseal .
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/
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#3
11-02-2012, 12:41 PM
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If an IDI Injector gets plugged there is no place for the Fuel/hydraulic pressure to go so most often it puts a hole or entirly cracks off a Fuel Injection hard Line.
On Direct Injection Injectors it is possible for one or more of the Holes in the Injector Tip to get plugged; but you don't have those. It is possible for the Pintel on IDI Injectors to stick or stick briefly when they are in the open/upward position and that causes a miss. But, that does not happen unless something had gotten inside like dirt of water (the Injector can pass Water but if Water sits in the Injector it can cause Rust and Rust can cause the Pintel to stick). But, I don't think this is what is happening to you. Change the Filters and cut open the Spin-on Filter over a Pot or Bowl so you can see what is inside of it. However, that won't help if the Tank Screen is also restricted.
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84 300D, 82 Volvo 244Gl Diesel
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#5
11-02-2012, 04:46 PM
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Quote:
If it is suff in the Fuel Tank your Car bouncing around could shif the crud in the Tank around and open up the Screen. Tank Vent plugged or restricted? Issues with the Fuell Supply Pump or Fuel Pressure Relief Valve? Any Diesel Repair book with a trouble shooting section is going to have plugged Fuel Filters at the top of the list when a Diesel Engine has a loss of power.
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84 300D, 82 Volvo 244Gl Diesel
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#6
11-02-2012, 08:31 PM
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I'd bet either your overboost is kicking in OR you have an intermittent leak in your vac system which is keeping the p2 flap from closing....
PS- I am closer to you now, in ecobb just over the river. I will work for beer.
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#7
11-03-2012, 03:54 AM
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Hmm
Quote:
Here is an easy test.. Remove the vacuum line from the mixer housing, plug the hose with a golf T. Test drive the car. If performance improved, you have: * A failing vacuum transducer. MB# 0005450327 * One or more vacuum system leaks. Please open your air filter box to verify rodents have not built a nest = blocking air flow. .
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ Last edited by whunter; 11-03-2012 at 09:45 PM.
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#9
11-03-2012, 07:41 PM
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Whunter, what is a mixer housing?
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What/where is that, and what does it look like?
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#10
11-03-2012, 09:46 PM
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Oops
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.
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#11
11-16-2014, 11:08 PM
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Here's how the story ended; the end solution
This is now written some 2 years after I posted the problem. In between, I'd tried certain things and still had the same problem. I never know if the changes I made will work, until I'm in the mountain areas again.
Thankfully, and by accident, I saw Kent Bergsma's video on YouTube about cleaning your TANK filter. I didn't even know the car had one. I had my general mechanic take the filter out, and sure enough, it was fairly clogged. He cleaned it, put it back in, and the car makes it up the hills of Va/W. VA again. If you do this, MAKE SURE you have a NEW FILTER and a proper tool on hand, because it's tight to get into that area. You don't want to have your car apart, and find out your filter got damaged when you took it out, and it's going to take 3 days to get one. If anyone needs one, please buy mine. I have the tool and a new filter on hand just in case, but I (thankfully) didn't need it. Email me (not message) if you need it. (this written Nov. 2014)
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#12
11-17-2014, 09:14 AM
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Sounds like a maintenance item to be completed at your leisure as opposed going through your experience.
If there is visible grit in the primary filter, have the above procedure on your to do list.
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83 SD 84 CD
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