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| EHV Voltage; Starting voltage at the Electo Hydraulic Valve | |
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| Tweet Topic Started: Sat Dec 20, 2014 9:21 pm (469 Views) | |
| 246kharmadog | Sat Dec 20, 2014 9:21 pm Post #1 |
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Hi folks. I am working on a new addition, an '87 230E and was wondering if anyone knows what voltage is normal for the ECU to supply to the Electro Hydraulic Valve while the engine is being started? I believe the valve is shot but have no data to rely on. Cheers, Dennis. Edited by 246kharmadog, Sat Dec 20, 2014 9:22 pm.
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| JustbeCoz | Sun Dec 21, 2014 8:32 pm Post #2 |
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I believe its more a milliamp thing measured in series with the eha. If you check the figures on the startekinfo manuals you should be able to see similar info if not for that exact engine. I think current should be a positive milliamp figure when ignition switched on ready for start to enable 2nd part of start enrichment. The 1st part is handled by cold start valve. When engine running and throttle blipped the milliamps should rise and then drop as the engine slows and the throttle released. ICV controlling idle air supply is a voltage measurement roughly 0.7 v on my car at start dropping as car warms up to normal idle speed. HTH |
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| 246kharmadog | Mon Dec 22, 2014 2:18 am Post #3 |
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Thanks, JustBeCoz! I am just trying to rule out problems by tests rather than replacing and seeing what happens. |
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| 246kharmadog | Mon Dec 22, 2014 2:43 am Post #4 |
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I have so many of these EHV's from vehicles I have bought, I would love to know how they function, they all have a resistance in the vicinity of 17 ohms, and remove the screw that covers the adjustment valve and you have another unknown entity, it screws inward 4 and one half turns before completely closing, and when you remove it completely it opens the passage from one of the two holes that align with the distributor. |
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| eagle3 | Mon Dec 22, 2014 5:58 am Post #5 |
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Therapy Needed
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According to my french Revue Technique it should be tested at 20C ambient temperature. Ignition on. 1-5 mA throttle shut (which should drop to zero as engine warms up) Over 8 mA throttle open - this figure will varie according to engine temperature, engine speed, throttle position. There are other tests regarding cold starting and releasing throttle at a certain engine speed to cut fuel supply when decelerating.. EDIT Oh hang on those figures are for post-89 models! Having reread I think for an 87 2.0 it's 11-15mA throttle shut at 20C and you should detect an increase when dabbing the throttle. Not 100% sure about the 2.3 tbh but I think the ecu was modded in '89 from what I can make out and it depends more on year than model for the M102. Having further read there are one or two mods done regarding the 2.3 in '88 so engine number might be important. It seems the '88 2.3 uses an electronic idle regulator and a different fuel pump and fuel pump relay. Probably best to have the peripherals(ecu etc) from the 2.3 to be on the safe side if you can.Anyway intensity should drop to zero with throttle shut as engine warms up except above 1300 rpm when car is decelerating(45mA when releasing accelerator at 2500rpm). You may detect a brief jump to about 25mA for about four seconds followed by a gradual decrease when starting from cold, although I don't suppose it gets that cold in Barbados. Intensity varies with throttle open depending on variables mentioned above. Sorry if all that sounds confusing but I'm just reading the manual. Edited by eagle3, Mon Dec 22, 2014 9:51 am.
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| 246kharmadog | Sat Dec 27, 2014 7:20 pm Post #6 |
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Thanks Eagle3. I need to find an accurate ammeter now. |
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Probably best to have the peripherals(ecu etc) from the 2.3 to be on the safe side if you can.
9:19 AM Jul 11