hefti
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Posts: 7
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Post by hefti on Sept 5, 2007 18:50:12 GMT
Hello,
I was rather hoping that someone may be able to help me!
I own a 1999 1.8 16v 306, over the past few months it developed an intermittent hunting problem on tickover.
I found out that this is commonly caused by the Stepper Motor, so I took it off and gave it a clean including the throttle body - this cured the problem for about a day.
So I changed the stepper motor, but the problem still occured, I then ended up changing the battery, Crankshaft sensor, MAP sensor and the coolant sensor, and the problem is still occuring, I can't see that it is fuel related or timing related as it is intermittent, also the lambda past on the MOT.
So I really don't know what else might be causing the problem. I have heard that my car suffers from problems with the coil pack, and I have been told that the air intake temp sensor can cause hunting, but I'm not 100%.
Does anyone have any ideas to what else might be causing this problem, it is extremely annoying!
Thanks in advance!
Ashley.
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Post by rick1974 on Sept 5, 2007 19:15:06 GMT
Have you checked the plugs? Long shot but could be as simple as that...
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hefti
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Posts: 7
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Post by hefti on Sept 5, 2007 21:01:56 GMT
Hi, yes I have had the plugs out and checked them and gave them a clean. They looked like normal not too much soot.
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Post by rick1974 on Sept 5, 2007 21:37:47 GMT
Could be the coil pack as you said. Does it drive ok other than that? Or does it seem to miss.
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hefti
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Posts: 7
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Post by hefti on Sept 6, 2007 5:23:37 GMT
It drives spot on, performes well, responds well. The only thing I have noticed it that if you're driving at 20-30 mph in say 2nd or 3rd at 2000 revs or under the car is slightly jumpy - but very faint though.
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Post by rick1974 on Sept 6, 2007 17:30:45 GMT
Doubt it's the coil pack then. Maybe the leads though. Take the plugs out and look at the ceramic around the base of the plugs, if it's brown around the bottom where it meets the metal, it could be the lead is shorting out.
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hefti
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Posts: 7
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Post by hefti on Sept 7, 2007 6:23:04 GMT
I don't have ht leads on my car, the coil pack acts as the ht leads.
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Post by rick1974 on Sept 7, 2007 16:51:10 GMT
Still check the plugs then, might be shorting down the plug
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hefti
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Posts: 7
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Post by hefti on Sept 7, 2007 17:25:40 GMT
I'll have a look over the weekend, and let you know.
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Post by oldpug on Sept 15, 2007 8:21:00 GMT
This is a good example of my reply to the 307 HDI XSI problem.You have to start first with a good diagnostic tool in the hands of a Pug` Tech`who can use it.You have spent lots of cash on components that have not solved the fault.Also I`m surprised the engine is not all over the place because after changing stepper motors,map sensors ect the ECU has to be reset with the diagnostic tool and the fault codes cleared!! otherwise it will run like a pig.I would say the fault may be the power steering pressure sensor,[this alters the idle speed to compensate to pas loads]but without a diag` it`s just guess work.
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Post by frank on Sept 15, 2007 19:32:46 GMT
i agree with oldpug, but unfortunatly i doubt very much you are going to take it to a professional. the cost of the parts you have replaced would of got it looked at and probably fixed!!
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hefti
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Posts: 7
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Post by hefti on Sept 15, 2007 21:28:07 GMT
Thanks for your advice, I have already had it into a pug specialist who used to be a main dealer, they spoke to a main dealer themselves for further advice, and no joy.
I have found a sensor underneath the manifold to the left handside that has a yellow and green wire going into it, the green wire has burnt/ melted and is no longer attached. So, I am going to have a look at that tomorrow.
The car is running and driving fine. Where do I find this power steering pressure sensor?
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Post by oldpug on Sept 20, 2007 16:19:52 GMT
Follow the oil pipe from the pump and you will find it in the metal part of the pipe,small sensor with a blue multi plug.Be very gentle! or you may kink or brake the pipe undoing the sensor.It looks as if you have found the fault,any burnt wire is bad news.I`m not sure,it may be the knock sensor.Sort out the wire and then have the fault codes cleared and the ECU reset.
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hefti
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Posts: 7
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Post by hefti on Sept 22, 2007 9:38:46 GMT
I managed to get to that wire, and it turns out that there is only supposed to be one wire going into it, so it hadn't burnt after all that!
I'll have a look for this sensor.
To be honest I still think the idle control valve is related, the one I have got doesn't have the same numbers as the old one. So I am thinking of buying another one.
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Post by oldpug on Sept 24, 2007 15:02:10 GMT
It is very important to get the correct one.Have you still got the old one?The shape of the tip of the plunger can be different.G S F and Euro can supply them but have difficulty in getting it right first time.I have found with parts like these its best to pay through the nose and get the right part by chassis no` at a main dealer. Also I will repeat!! have the codes cleared and the ECU reset.
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