mike32carrera Posted April 12, 2016 Share Posted April 12, 2016 I hoped the wealth of experience & knowledge on here, might point me towards a solution for a serious running issue with my 1984 3.2 Carrera. First, a brief history. I purchased it in February 2015. It was delivered new to the UK in April 1984. I am the 9th owner. It's covered 106,000 miles and came with a huge history file documenting every service and penny spent from new. All carried out by Porsche main dealers and specialists. Which is one of the reasons I chose this particular example. Despite all this, I acquired it in a somewhat project state. So it came to me essentially as a rolling, running, driving shell. It was trailered home and sat in the garage awaiting my attention. I would occasionally start it up for a couple of minutes. It always started with ease, with a flick of the key and a half turn of the starter and without even looking at the gas pedal. It ran and sounded very healthy, like a good one should. Then, it sat for about three months without being looked at or started. The next time I tried, it really struggled to start. After about a minute of intermittent cranking, it did eventually cough into life, albeit with a bit of a misfire and LOTS of white smoke which smelled very strong of fuel. I initially thought it had flooded. So I tried revving it up, both with a light and then a more enthusiastic foot on the pedal. But it would not clear or run properly. I tried this a couple of times over the next few days and weeks, but with no improvement. Sometimes it would backfire quite dramatically, I think out of the inlet. There is no air filter fitted at present. I checked the plugs, which look new, but were wet and dark grey / black. I began to research causes of over fuelling, via Google links to a couple of US based forums, I figured it might be the cylinder head temp sensor. It's the original single wire item. I get no ohms reading with a cold engine. However, when I unplug it with the engine idling at cold, the idle note changes, so I guess it's functioning... ? Wouldn't a faulty CHT sensor cause over fuelling when hot, whilst providing adequate when cold ? Last week, after ignoring the car for some time whilst I work on other stuff, I fitted new leads, cap and rotor, as the current ones were looking their age. This made no difference to the way it starts and runs. One the whole, I know my way around cars fairly well. However, I'm not too good at diagnosing electrical / ignition / engine management issues. I have a very friendly local independent Porsche specialist, but I'd rather not go down that route if I can help it. He did suggest that they can get choked up by being started but not driven. But the way this fault manifested itself makes me think there is a bigger issue. How could this develop simply from sitting idle for three months??My feeling is that the ECU thinks the engine is at full throttle, so is delivering that amount of fuel. My thoughts of possible faults are Faulty CHT sensor.Faulty inlet MAF.Faulty throttle position sensor. I'm feeling rather stressed over this. I'm reluctant to start it up now due to the massive plumes of smoke and fuel bellowing from the exhaust. It really is that bad, instantly filling up the garage + outside and hangs in the air for ages. I have to consider my neighbours, who live in close proximity. Help please would be much appreciated ! Link to comment Share on other sites More sharing options...
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