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| Cold start issue; Cold start issue | |
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| Tweet Topic Started: Sat Aug 19, 2017 5:04 pm (342 Views) | |
| yax | Sat Aug 19, 2017 5:04 pm Post #1 |
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Newbie
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190e 1990 2.0 petrol manual standard car well maintained. Advice please. Car starts instantly when cold but will not rev - stutters when accelerator is pressed. It will idle and after a couple of minutes when starting to warm up all is fine. No other issues whatsoever. Idle / cold start valve has been cleaned. New distributor cap and rotor arm fitted and new spark plugs fitted. Passed MOT Wednesday but very lean mixture noted by tester .012%. No vacuum leaks found. starting to run out of ideas. Thanks in antisipation |
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| xander14 | Sun Aug 20, 2017 5:02 pm Post #2 |
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Part of things
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Check the fuse on the OVP relay if you haven't already |
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| yax | Mon Aug 21, 2017 7:23 pm Post #3 |
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Newbie
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Many thanks - will eliminate that tomorrow. |
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| griffin | Tue Aug 22, 2017 3:10 pm Post #4 |
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Part of things
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And just be sure.. You are absolutely sure there are no vacuum leaks? Because lean mixture can be due to vacuum problems. Have you just acquired the car with this problem or has it started happening since some other work was done ? |
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| yax | Tue Aug 22, 2017 8:00 pm Post #5 |
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Newbie
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OVP relay fuse not blown but dirty. Cleaned fuse and OVP relay pins. There is an improvement but still not right. Car purchased 12 months ago with blown head gasket but in otherwise wonderful condition. Just 31 stamps in the service booklet! Has now had new head gasket. Problem surfaced later but not just after work was done and has been intermittent since. I think I need to persevere with chasing any vacuum leak. Otherwise car drives very very well. |
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| griffin | Tue Aug 22, 2017 8:54 pm Post #6 |
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Part of things
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Check the vacuum tube from ignition control unit area to the fuel meter rubber boot (i.e. Directly under the air flow meter plate). If this isn't connected to the pipe that meets the boot, you get misfire when cold. Something else to check... :-) And look at the leads when it's running in the dark.Especially the king lead as it can arc back to the power steering reservoir, etc. Edited by griffin, Tue Aug 22, 2017 8:59 pm.
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| yax | Thu Aug 24, 2017 12:38 pm Post #7 |
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Newbie
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Thanks Griffin - will check it out at the weekend. |
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| yax | Thu Aug 31, 2017 2:18 pm Post #8 |
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Newbie
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No obvious vacuum hoses broken or unconnected. Problem persists but only for 30 seconds or so after starting the engine from cold then all is fine. Once warm starting is fine. If I start the engine and let it idle and do not accelerate for 30 seconds all is fine. My other M102 engined Mercedes a 230 G wagen has about 250k miles on it and has never had a similar problem in 14 years. |
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| optimusprime | Fri Sep 1, 2017 9:33 am Post #9 |
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Part of things
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Might be engine temperature sensor . This helps the ECU because it sends the messages to the ecu to say engine is cold. Then the ecu will change the fuel ratio for cold start to [rich ] .If sensor its not working you engine is starting on normal mixture this is not good enough for cold starts. |
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| yax | Mon Sep 4, 2017 7:23 pm Post #10 |
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Newbie
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Sounds very possible - where is the temperature sensor? |
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3:14 PM Jul 11