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| Thread ID: 118745 | 2011-06-19 02:17:00 | Any Mechanics here? | hueybot3000 (3646) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1210513 | 2011-06-22 00:41:00 | I'm not too sure a '98 Mitsubishi keeps misfire counts - maybe - but not that I remember from scanning then for smog tests and repairs when I worked. Therefor scanning for codes and other data lines won't usually show much - especially with coked-up plugs. A regular scope won't tell much either - since the plugs according to you are all done for anyway. Really though - scoping an engine is so old fashioned. Anything that messes with the emissions will pop a CEL anyway - that's the first place to start: pull the codes and see what the ECM thinks is wrong. If all the plugs are oil fouled, then you've gotta find the source first. Rings usually show up on start up from a de-acceleration - like from a small downhill to a stop sign and then when you start to move again, there'll be smoke. Rings just don't seem to fail like they used to - say, pre-1980 or so. Most likely your problem is the valve guides and/or stem seals. If the engine's been cooked and overheated, then all bets are off. |
SurferJoe46 (51) | ||
| 1210514 | 2011-06-22 01:02:00 | I'm not too sure a '98 Mitsubishi keeps misfire counts - maybe - but not that I remember from scanning then for smog tests and repairs when I worked . Therefor scanning for codes and other data lines won't usually show much - especially with coked-up plugs . A regular scope won't tell much either - since the plugs according to you are all done for anyway . Really though - scoping an engine is so old fashioned . Anything that messes with the emissions will pop a CEL anyway - that's the first place to start: pull the codes and see what the ECM thinks is wrong . If all the plugs are oil fouled, then you've gotta find the source first . Rings usually show up on start up from a de-acceleration - like from a small downhill to a stop sign and then when you start to move again, there'll be smoke . Rings just don't seem to fail like they used to - say, pre-1980 or so . Most likely your problem is the valve guides and/or stem seals . If the engine's been cooked and overheated, then all bets are off . SJ, Do you think sticky valves might be a cause of missing? or some variant of that, i . e . stems might be worn/gunged up . |
kahawai chaser (3545) | ||
| 1210515 | 2011-06-22 02:09:00 | It's possible - but there's gonna be more hints and malfunctions too. Unless someone was using crude oil or never changed it, the modern oils don't do that much any more. BUT - A sticky or gunked-up valve would also hang up at cranking and it would cause either a blow-back through the intake or a 'whoosh' out the exhaust during cranking as the unclosed valve let pressure escape. This would show as a very aggravated vacuum needle in a test during cranking and at idle speeds with loss of overall vacuum swinging the needle wildly. |
SurferJoe46 (51) | ||
| 1210516 | 2011-06-23 04:35:00 | The spark plugs installed are the right ones right? GDI engines are supposed to have two pronged ones like this img.eautopartscatalog.com I've also heard that the coil packs are prone to failure. They're fairly easy to replace anyway, given how they just unscrew and pull out from the top of the engine. |
ryanjames.powell (13554) | ||
| 1210517 | 2011-07-10 03:50:00 | Right bit of an update, been slack but head is going to shop tomorrow for a reco. Was just gonna get the seals done but the price they quoted for a reco was to good so thought may as well. It does have 2 prong plugs in it, and as far as the misfire it's highly possibly it is a coil pack. They were a bit oilly around the stem so that may be the problem. Will find out for sure once its back together. Few pics... |
hueybot3000 (3646) | ||
| 1210518 | 2011-07-10 05:42:00 | You said it was blowing heaps of bloo smoke, a faulty coil wont make it blow smoke. Bloo smoke is oil burning smoke, white is too lean black is to rich a mixture, a puff of grey is good though. |
prefect (6291) | ||
| 1210519 | 2011-07-10 05:44:00 | no im pretty sure the miss was unrelated to the smoke. but most likely a symptom of oil getting in the cylinder and either oilling up plugs (which they were) or getting up coil | hueybot3000 (3646) | ||
| 1210520 | 2011-07-10 05:57:00 | thats fair | prefect (6291) | ||
| 1210521 | 2011-07-10 08:39:00 | Few pics... That second one looks familiar, is that Gould Cres? |
ubergeek85 (131) | ||
| 1210522 | 2011-07-10 08:40:00 | Gould Cres? If you mean street then nope | hueybot3000 (3646) | ||
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