"duurtlang" (duurtlang)
12/03/2015 at 12:21 • Filed to: None
0
20|
"duurtlang" (duurtlang)
12/03/2015 at 12:21 • Filed to: None | 0
| 20 |
There’s engine oil on the thread of all four spark plugs (they look fine otherwise), with a cold engine the engine smokes and spews a bit of oil from the exhaust, one of the middle cylinders has a 10% lower compression than the other three. What’s going on, and what can I do? 1987 Peugeot 205 CTI.
The engine is question is a fuel injected XU5J engine without cat, the stock engine in the 1987 Peugeot 205 GTI/CTI 1.6. I’ve !!!error: Indecipherable SUB-paragraph formatting!!! the car recently as a project, but I’m a total novice when it comes to problems like these.
Car hasn’t been driven for six years, until a few months ago. It has done a few hundred km since. Other than the battery and the fuel filter everything was old. I already replaced the distributer/cap and spark plug cables.
Internet sourced XU5J engine picture:
SidewaysOnDirt still misses Bowie
> duurtlang
12/03/2015 at 12:26 |
|
Sounds like a bad piston ring creating blowby that’s causing oil in your intake to me! Not much you can do apart from a rebuild or blocking off the PCV return to the intake to try to mitigate the buildup.
crowmolly
> duurtlang
12/03/2015 at 12:29 |
|
How are the PCV valve and the vacuum lines? Old? Original ?
Ash78, voting early and often
> duurtlang
12/03/2015 at 12:32 |
|
Valve cover gasket, I’d guess. That’s the most likely source of oil in the plug wells. Sometimes the oil can seep past the plugs, but I’ve never personally seen it.
The compression and smoking problem is probably a bad piston ring, but I don’t know if 10% compression loss is really bad on that era of car.
|
duurtlang
> crowmolly
12/03/2015 at 12:38 |
|
Most definitely old. I don’t know if they’re original.
I did replace the spring that keeps the hatch open this week, and it had ‘made in West Germany’ stamped on it. That’s a great way to age a part...
450X_FTW
> duurtlang
12/03/2015 at 12:40 |
|
There’s engine oil on the thread of all four spark plugs
That’s normal, it helps lubricate your plugs so they spin with ease.
|
crowmolly
> duurtlang
12/03/2015 at 12:40 |
|
Ha ha! That’s awesome.
I’d start with the PCV system and see what shape it’s in.
|
duurtlang
> SidewaysOnDirt still misses Bowie
12/03/2015 at 12:41 |
|
I fear rebuilding is almost unavoidable. It will need new belts anyway, as they are 10-12 years old. So the head mostly like need to come off as well...
|
SidewaysOnDirt still misses Bowie
> duurtlang
12/03/2015 at 12:43 |
|
Yep. May as well just do the whole thing if you care enough.
|
duurtlang
> 450X_FTW
12/03/2015 at 12:43 |
|
Great, thanks! I’ll top off the blinker fluid just in case.
|
duurtlang
> Ash78, voting early and often
12/03/2015 at 12:45 |
|
Valve cover gasket is on my list of things to replace. I’ve got the part already. Probably an easy job to do. The piston ring is something I fear though.
Urambo Tauro
> duurtlang
12/03/2015 at 12:46 |
|
Is there oil on any other part of the plug?
The leakage might be internal, but you should be able to tell if it’s coming from above. A valve cover gasket would be easier to fix (if that’s the source of the problem).
|
duurtlang
> SidewaysOnDirt still misses Bowie
12/03/2015 at 12:48 |
|
Well, until recently my wrenching experience consisted of replacing a battery and window wipers and topping off fluid. I bought this car to teach myself to wrench a bit, with a little help from others. It’s an appreciating semi-classic, so I’m not wasting any money. Just time, which I don’t mind. This is a lot all at once though.
|
SidewaysOnDirt still misses Bowie
> duurtlang
12/03/2015 at 12:51 |
|
It happens. If you bought it intending it to be a project car, it’s not that big of a deal. Yeah, there’s alot of work that needs to be done, but it’s not like it has to be all done now. I expect my 4AGE 16V rebuild to take
forever.
|
duurtlang
> Urambo Tauro
12/03/2015 at 12:58 |
|
The valve cover does leak, and I’ve already bought a replacement. I don’t believe there’s oil on any other part of the plug. I made one crappy picture of one of the plugs. All plugs were affected similarly. Given the cleanliness of the rest of the plug (no picture sadly) I doubt if the oil came from above though.
I assumed the oil on the plugs and out of the exhaust had the same cause, but reading the replies here they might be unrelated.
RallyWrench
> duurtlang
12/03/2015 at 14:58 |
|
10% compression difference is within the generally allowable 15% margin. Add a small squirt of oil to that cylinder and retest it to see if that number comes up. If so, it’s in the rings. Are the valves adjustable or hydraulic? Does it smoke more on deceleration? I’m curious if the valve stem seals are allowing some leakdown, or compression blowby is overwhelming the PCV system and filling the intake with oil, which then runs into cylinders with open valves overnight.
Needmoargarage
> duurtlang
12/03/2015 at 15:32 |
|
I don’t think the oil on the spark plug threads and smoke on start up are necessarily related. As others have mentioned, I’d start by changing the valve cover gasket and PCV system components. If that doesn’t help, you might be looking at replacing valve stem seals or more in-depth repairs.
Does it only smoke on the first start up after sitting overnight, or every time it’s cold?
|
duurtlang
> Needmoargarage
12/03/2015 at 15:37 |
|
It’s a project car I bought as a project car, last month. I bought it and directly drove it to the place where I store it now, which was a 20 km trip. I don’t think I’ve ever started it with a warm engine. It did stop smoking when it got somewhat warm.
|
Needmoargarage
> duurtlang
12/03/2015 at 20:23 |
|
I ask because it might help you diagnose the problem. If it only smokes at startup after sitting for a while, valve stem seals are possibly worn and need replacement. If it smokes at startup after a good drive, that might point to pcv system failure.
Keep in mind I’m not very familiar with that engine, but the concept should be somewhat universal.
Good luck!
gmporschenut also a fan of hondas
> duurtlang
12/03/2015 at 23:00 |
|
I would recommend getting one of these.
Best $30 or 25 euro you could spend when starting a project.
without running for 6 years the piston rings could have seized and aren’t sealing properly. As noted could also be valve cover gasket, valve sleeve.
|
duurtlang
> gmporschenut also a fan of hondas
12/04/2015 at 02:13 |
|
I’ve already got a Haynes and another shop manual on the 205. They’re very helpful, but when it comes to general problem diagnosis they aren’t the best. It’s my utter lack of experience that’s the problem.