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#16
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update: injectors replaced, stumbling persists
I’ve replaced the air filter, fuel filter, injectors (with new top seal, o-ring, & nylon sleeve), plugs, 2 top intake hoses + 2 hoses to the idle valve, and cap&rotor. The ignition wires are fairly new and idle and cold start valves were cleaned. The car runs smoother when not stumbling after replacing the injectors; however, my neighbor who runs a MBZ shop says the culprit is the fuel distributor (FD). He shop runs into a lot of faulty FDs due to age and I think that’s the step in the right direction. Does anyone agree with this? Maybe I should replace the fuel pressure regulator (FPR) and/or thermos/vacuum valve on top of the intake manifold. I didn’t mess with the mixture as suggested since when she runs cold or hot, she purrs. I’ve almost decided to tackle the rebuild myself and order a rebuild kit from ebay. Additionally, I’ll also be cleaning the air mixture assembly and throttle body while I’m in there if I do so. My current laundry list is as follows:
FD rebuild kit FD gasket EHA gaskets Throttle body gasket Air Flow Meter boot w/ gasket Thermo/Vac valve (as needed) FPR (as needed) Is there something else I should consider cleaning or replacing interms of gasket, o-rings, valve, etc… TIA, sjsfiji
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sjsfiji '87 W124 260E (DD) 98K orig. mi. @7/15 CLK 7-Spoke Forged Wheels Neuspeed springs/Bilstein Sport 4/3 bump (F/R) '97 993 Carrera 106K orig. mi. Always driven like it's stolen |
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Did you at least test the fuel/air mixture before you go out and buy a new one?
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1990 190E 3.0L |
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duty cycle
If you're referring to the duty cycle, no I did not change it. I would need to get the car up to temp and rev at 2500 rpm to properly adjust it. At least that's what I've read. I don't want to run the car the way it is. My shop owner neighbor swears she runs just fine when not stumbling and that the FD just needs to be rebuilt. The diaphragm in the FD may have gone bad.
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sjsfiji '87 W124 260E (DD) 98K orig. mi. @7/15 CLK 7-Spoke Forged Wheels Neuspeed springs/Bilstein Sport 4/3 bump (F/R) '97 993 Carrera 106K orig. mi. Always driven like it's stolen |
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Again, these are all just theories and guesses from your neighbor, but hopefully the rebuild fixes the problem. If not, you will eventually need to start systematically testing the components instead of replacing everything under the hood. I've been through the same exact thing a few months back and replaced almost everything fuel related and ignition related... More M103 rough idle problems.....WHY???
Good luck and keep us posted.
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1990 190E 3.0L |
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FD rebuild
Yeah, i hope that fixes it too. At first I assumed the problem was electrical [e.g. spark] so I did the normal tune-up wear items (plugs, wires, cap & rotor). Then we, neighbor and I, realized or at least assumed the problem is intermittent fuel starvation at only certain cylinders, so the plan of attack was fuel filter (wear item), injectors (still had orig steel), then FD. That is where I am at right now and I hope that's the end.
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sjsfiji '87 W124 260E (DD) 98K orig. mi. @7/15 CLK 7-Spoke Forged Wheels Neuspeed springs/Bilstein Sport 4/3 bump (F/R) '97 993 Carrera 106K orig. mi. Always driven like it's stolen |
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Any updates ??
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1985 300D 198K sold 1982 300D 202K 1989 300E 125K 1992 940T "If you dont have time to do it safely, you dont have time to do it" "The democracy will cease to exist when you take away from those who are willing to work and give to those who would not." |
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Try this it wont cost a dime ,Remove the hose going to the brake srvo block off the end with a bung ,so no vacumm can get out or air in .Try it now ..I go along with not messing with the mixture this is something simple. The fuel pressure regulator can get blocked up with dirt and rust this is in the same area as the fuel filter... Take a fuel pressure reading also .Do come back and let us know ,easy things first .
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Quote:
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Steven 1989 260E (276K miles) 1995 E320 (50K miles) |
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Problem fixed then came back... update
All,
Here's an update... So far I've replaced cap, rotor, plugs, wires, o2 sensor, fuel filter, injectors, icv hoses, intake hoses, air metering boot, fuel pressure regulator, and fuel distributor with eha and potentiometer (from donor car) and the car would run without stumbling but it was really rich and would not start cause it floods. I gave up and sent it my indy. He replaced a bad temp sensor, adjusted potentiometer and mixture. The car ran with high idle ~1k RMP but won't kick down. I think that's a separate problem or maybe related (enrichment problem?). High idle I think might just be a misadjusted potentiometer. Anyhow, I started the car yesterday and let idle for less than a minute and when I placed it in drive it would stumble then recover. It ran fine when placed back in park. I started her up today just fine and adjusted mixture a little richer and she ran fine/smooth in idle and when in drive with good pick up. I started her up tonight and it was stumbling from the get go then recover while in idle. I'm thinking it might be wiring to the temp sensor is suspect which might actually be the original problem. Any thoughts? The stumbling is more like bucking as if there's no detonation in one or more cylinders, then I smell fuel. I see 3 sensors inline from cylinders 1-6. Can someone shed light on what each sensor does? I have an idea but rather query you. Thanks....
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sjsfiji '87 W124 260E (DD) 98K orig. mi. @7/15 CLK 7-Spoke Forged Wheels Neuspeed springs/Bilstein Sport 4/3 bump (F/R) '97 993 Carrera 106K orig. mi. Always driven like it's stolen |
#25
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In case it matter, the temp in the garage when I last started her up was about 48F.
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sjsfiji '87 W124 260E (DD) 98K orig. mi. @7/15 CLK 7-Spoke Forged Wheels Neuspeed springs/Bilstein Sport 4/3 bump (F/R) '97 993 Carrera 106K orig. mi. Always driven like it's stolen |
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Going thru quite similar with my 89 300E.
Read a volume of material on the issue, about War and Peace for volume. The high idle seems to be locked into the IAC. I replaced my IAC with a gate valve which seems to have eliminated my surging idle but left me with an idle of about 1K. Not new to working on cars as I go back to '51 Packard straight 8. Have to say this CIS MB is one of the worst pieces of sheeeet I have ever worked on. On the positive, once I get this POS running correctly again, its is the last MB I will be working on. Done, done done !!
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1985 300D 198K sold 1982 300D 202K 1989 300E 125K 1992 940T "If you dont have time to do it safely, you dont have time to do it" "The democracy will cease to exist when you take away from those who are willing to work and give to those who would not." |
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