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| over reving on tickover | |
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| Tweet Topic Started: Sat Dec 31, 2016 2:06 pm (473 Views) | |
| xander14 | Sat Dec 31, 2016 2:06 pm Post #1 |
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Hi guys, had my 190 2.0 for about a year now and have always had a problem cold starting, takes a couple of go's then fires up, runs like a bag of spanners for a few seconds and then it's fine, after following many threads on here I decided today to check the fuse on the O.V.P. relay and found that it had blown, replaced the fuse and bingo fired up first time from cold just fine. The problem I have now is when the engine warms up it ticks over at 1500 rpm, (it ticked over when warm at 1000rpm before which I know is still too high) is there any way of manually adjusting tickover? I'm guessing somone might have been tinkering in the past, thanks for any suggestions. |
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| MercManCraig | Sat Dec 31, 2016 2:59 pm Post #2 |
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Craig
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There is no way to change the idle on the late model cars but idling high sounds very much like the idle control valve is not working or vacuum leaks, here are a few quick free checks i'd recommend though. 1. Check the throttle mechanism is sitting correctly at idle (check cable adjustment and feel the snap action on the mechanism if its woolly then check the springs are not bust or stretched) 2. check the idle switch for continuity on the throttle valve mechanism. 3. check for any obvious vacuum leaks (bit of a pain to do thoroughly but kinda necessary) 4. inspect the electrical plugs for corrosion and give them a quick squirt of wd40 or similar when you put them back on. 5. inspect the idle control valve and check for voltage at the plug to it. To check the ICV the easiest way I've found is to take it off and take a 9v battery and briefly connect the terminals while looking at the slider in the hose connection ends. It's basically a solenoid so it should make a clunky noise and you'll see the slider flapping about inside, sometimes these can become sticky too which can cause stalling and weird idle problems , if the idle control valve isn't working for whatever reason it'd idle high like yours is. Just a note about the ICV, if you've got no power at the ICV plug then check the connections on the OVP and its plug for corrosion. You'll probably already know but the ICV is powered by the OVP. |
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| xander14 | Sat Dec 31, 2016 7:12 pm Post #3 |
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Thanks a lot Derlaudtraut, done some of those already but haven't looked at the I.C.V. or idle switch for continuity yet, (will look tomorrow depending of severity of hangover) although when I push the throttle mech against the wheel of the idle switch the rev's increase is this right? I do miss the days of just turning a screw on a carb |
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| xander14 | Mon Jan 2, 2017 4:47 pm Post #4 |
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Couldn't do anything yesterday due to rain and hangover, but woke up to sunshine today and jumped out of bed first thing (10.30am actually, back to work tomorrow and it was my last lie in) anyway took the air box off and had another search for vacum leaks, not my favourite job and I had done it once trying to solve my cold start issue but thought I might have missed somthing, few pipes that looked like they will need replacing in the future but nothing serious. I then removed the Idel control valve, cleaned and tested it with a 9v battery the solenoid was moving fine, checked the voltage to it and refited it, the bottom pipe was a pain to get back on but got there in the end, fired the car up but no change. Checked the electrical connections and the continuity of the idel switch and all were fine. Made a coffee fired her up again and thought about playing around with the fuel mixture when I happened to remember the throttle mechanism, gave it a look over all looked okay I played around with the cable adjuster (couldn't hurt I thought) and bingo, rev's dropped down from 1500 to 750rpm just like that. Put the air box back on and took her for a trip around the block to test everything which actually turned into a 40 mile round trip as she is running the best she has ever done in the 12 months of my ownership. Sat here now with mixed feelings, managed to resolve two issues that I had been putting off for a while but feeling a bit of a knob head for not starting in one case, with looking for the obvious. Just fessing up about this for a number of reasons, 1, I have no shame, 2, I hate reading threads which raise an issue, people give advice but your never told how they resolved the problem, and, 3, as a reminder to people in a similar situation to check the bleeding obvious first
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| MercManCraig | Mon Jan 2, 2017 5:15 pm Post #5 |
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Craig
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Good to hear it's sorted, its usually something like that right under your nose ! Fear not, we've all been there haha ! |
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| MalcolmK | Mon May 1, 2017 12:47 am Post #6 |
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OK thanks for this I have checked some of these but not points 2, 4 & 5. will report back Malcolm |
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| stwat | Mon May 1, 2017 12:59 am Post #7 |
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Is the throttle lever clicking the microswitch on the throttle body when you fully lift off the accelerator pedal?
Edited by stwat, Mon May 1, 2017 1:00 am.
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