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| OVR -when changing it hasn't helped :( | |
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| Tweet Topic Started: Sat Apr 7, 2018 5:56 pm (246 Views) | |
| scuddy | Sat Apr 7, 2018 5:56 pm Post #1 |
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More than part of things
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Hey guys, Some guidance needed. About three months ago, while driving home from work with the engine warming up, on a light throttle the engined lost all power and just cut out. Coasted/pulled over, to ponder. Dirty fuel? Car did not restart easily, and when it did, the idle was feeble, as if there was fuel or air starvation. Then it sort of 'cleared' itself, settled to a healthy idle and all was right with the world. Two weeks later, engine warm. Sat in traffic for a few minutes with a normal nice idle, the engine stalled. Restarted, lumpy idle, stalled again. Restarted, lumpy idle, 'cleared' itself and was fine. Last week. Very sluggish start from cold. Misfire from idle. En route to work, the ABS warning light came on. On another journey later that day, no ABS warning light. Anyway, to fast track where we are. Poor starting when hot or cold, but not always. Car can be fine for days and show no problems. Days can pass with no ABS light, then mid journey, it will show. Logistics meant that taking it to my Merc Mechanic wasn't possible. So I left it with another general garage that I trust with a hunch it was the OVR. I said nothing about that, but they came to the same conclusion (one of the technicians has experience of the W201 and W124 and had the same problem). Today, they changed the OVR. And guess what... I've still got exactly the same problems. Could my replacement OVR be duff? Could it be a duff vacuum line somewhere? I'll take it to see my Merc doc when he's free to assess it, but I'm wondering what else the problem could be. Any suggestions? *Spark plugs, HT leads, disti and battery changed two years/10k ago, to possibly rule them out. Edited by scuddy, Sat Apr 7, 2018 6:01 pm.
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| stwat | Sat Apr 7, 2018 6:00 pm Post #2 |
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Typical symptoms of a duff OVP relay. |
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| scuddy | Sat Apr 7, 2018 6:03 pm Post #3 |
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More than part of things
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cheers man. Is it typical for the OVP to be duff? Mine came from MB. I'm not ruling it out of course that it could be duff. But if I've now got the same failed OVP problems I started with, then it would point to a duff OVP, correct? |
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| stwat | Sat Apr 7, 2018 6:04 pm Post #4 |
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It could also be worn brushes in the alternator voltage regulator. |
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| scuddy | Sat Apr 7, 2018 6:07 pm Post #5 |
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More than part of things
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ah, ok, Would that throw up the same problems then, Stwat? i feel sick in my stomach in traffic when the engine coughs, splutters, coughs. Hate that feeling at roundabouts or in traffic. |
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| Greek Taxi | Sat Apr 7, 2018 7:08 pm Post #6 |
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More than part of things
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Brushes are an easy check, Scuddy, you can get the back off the alternator with it in situ, then remove the regulator. That's assuming your alternator isn't vastly different to mine. I got a replacement from Wood Auto Supplies, which do mail order from sunny Huddersfield. |
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| scuddy | Sat Apr 7, 2018 7:21 pm Post #7 |
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More than part of things
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Thanks, GT I'm not technically proficient and I'm stuffed in any situation with anything more sophisticated than a knife and folk ![]() I will put all of these great suggestions to my MB bloke and outline the symptoms, plus what has been done to date to fix them. Outside of idle and restart issues, it drove home just like a 190 should - quiet, composed. Teasing me with its loveliness, while scorching me with its wobbles. If I want that sort of nonsense, I'd buy a 156 ![]() |
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| G3MAW | Sun Apr 8, 2018 8:39 am Post #8 |
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Part of things
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Could be intermittent fuel starvation caused by a faulty fuel pump relay, due to dry soldered joints. Ask your mechanic to bridge the fuel pump relay socket connections ( he should know which ones ) to isolate your running symptoms, without needlessly forking out for a new relay. If this doesn’t fix the problem then the fuel filter, next to the fuel pump, might be suspect, especially if there has been a buildup of sediment in the fuel tank. Check one item at a time. |
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| optimusprime | Sun Apr 8, 2018 10:16 am Post #9 |
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Part of things
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Check the filter fitted in the fuel distributor . Do simple things first 1 check fuses .All earth points are making good earth .Then filter in the fuel line by the fuel pump ,if blocked it will cut the fuel supply to injection system. Remove distributor cap and see what the centre carbon brush is doing, it may be broken off or just not making contact with rotor arm ..let us know how you get on .. |
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| scuddy | Sun Apr 8, 2018 3:44 pm Post #10 |
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More than part of things
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thanks again, chaps would your suggestions also address the ABS light issue?will keep you posted
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| optimusprime | Mon Apr 9, 2018 10:28 am Post #11 |
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Part of things
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Can you post the numbers on the OVP to check if the right one was given to you at mb . |
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| martinw190 | Mon Apr 9, 2018 12:10 pm Post #12 |
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Part of things
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Doesn't sound like only the OVP relay to me. Mine has gone twice and both times symptoms were: Fast Idle Hard cold starting ABS light on Once started, the car was otherwise reliable and fine to drive. The first replacement OVP was a pattern part. That lasted about a year, and I replaced it with a genuine MB part. When I stripped the pattern part down to see if I could see the fault, it had been assembled incorrectly and the difference in quality between it and the MB part was night and day. Sounds like you've got a different fault, or 2 faults. |
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| aemt | Mon Apr 9, 2018 12:20 pm Post #13 |
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Serial 190E Owner
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Have the coil checked.
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| scuddy | Sat Apr 28, 2018 12:28 pm Post #14 |
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More than part of things
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Hello chaps, Apologies for the late reply and update on this one. I had two problems that pointed to the OVR, but as some of you suggested, I may have had two separate problems that looked like the OVR, but weren't. You were right ![]() The starting/running/stalling issue... idle too low, air/fuel mixture had gone out of kilter . Purrs like a kitten now, and - at this precise moment in time - drives fine too. ABS light is still intermittent, and I suspect best case scenario that's just a wooky sensor. i'll attend to that next month; for me it's more important that it starts and runs, which is where we're at. As for the new OVR? Well, my thinking is that the old one was probably going to go at some point anyway, so I guess replacing it can count as preventative maintenance rather a waste of money
Edited by scuddy, Sat Apr 28, 2018 12:29 pm.
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| optimusprime | Sun Apr 29, 2018 10:47 am Post #15 |
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Part of things
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Can keep a a spare in the boot . Great new your up and running again .Now put fuel in, along with a bottle of RED-X give it a good run dont blow the engine out these cars are a few years old now so treat them with respect ., |
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I'm not technically proficient and I'm stuffed in any situation with anything more sophisticated than a knife and folk
. Purrs like a kitten now, and - at this precise moment in time - drives fine too. 
9:37 AM Jul 11