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Topic: 24V firing on only 3 cylinders (Read 404 times) |
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Scorpio24v
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24V firing on only 3 cylinders
« on: Mar 1st, 2007, 10:48am » |
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While driving my Scorpio 24V it suddenly lost all power, first thought was that the transmission had popped out of gear. But after stopping it was clear that it was not running on all cylinders. Car was towed home and I checked for error codes. One code found: P0340, Camshaft Position Sensor Circuit Malfunction. Installed a new sensor but no difference.
The engine starts (after turning it over for a long time) but the exhaust manifold for cylinders 4,5 and 6 do not get warm. Easy to check as it was -25C at the time 
Removed the sparkplugs which seemed ok, some oil and rusthingyer on the outside but nothing much.
Installed new plugs and checked them against ground for sparks and they were ok. So I have ignition?
After again starting the car and then removing the sparkplugs they were all wet. So I have fuel?
The P0340 also came back, so checked the wiring for the sensor to the ecu, which was ok.
Does anybody have any ideas about what to check next?
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scorpio_man
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Ford Kuga awd
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Re: 24V firing on only 3 cylinders
« Reply #1 on: Mar 1st, 2007, 11:15am » |
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hi there
edis unit? coil pack? or......
maybe the chain has broken/jumped (hope not)?
hth
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Scorpio24v
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Re: 24V firing on only 3 cylinders
« Reply #2 on: Mar 1st, 2007, 11:45am » |
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Thanks for the quick reply.
If the chain has jumped, shouldn't there be some extra noise? I changed the camchain tensioner last spring, as it was rattling quite much. After that that the rattle went away.
If the coil pack is broken is it still possible to get a spark from the plugs?
The edis unit seems to be located under the powersteering units reservoir and is covered in oil. I'll try cleaning it up and see if it helps.
/Jocke
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Highlander
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13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
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Re: 24V firing on only 3 cylinders
« Reply #3 on: Mar 1st, 2007, 11:57am » |
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sounds like a broken chain, check for compression on 4,5,6
If the chain breaks in the right place there wouldnt be any noise
Your EDIS unit is screwed onto the inside of the inner wing behind the washer bottle, behind the headlight
Is it 95-98 Scorpio you have?
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on Oct 17th, 2011, 12:35pm, Simmo wrote:I give up !  Too much for an old boy!  |
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Scorpio24v
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Re: 24V firing on only 3 cylinders
« Reply #4 on: Mar 1st, 2007, 1:19pm » |
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The car is a -95 new model Scorpio.
Checked the compression and on the working side i got a value of about 160 on all cylinders and on the other side 100 (4), 100 (5) and 130 (6).
(I have never done this measurement before so the values may not be totally correct but I measured all cylinders the same way so the results should be comparable.)
So it definitely looks like a problem with the camchain?
How much do I have to take the engine apart to confirm that either the camchain has jumped or is broken?
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Highlander
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Re: 24V firing on only 3 cylinders
« Reply #5 on: Mar 1st, 2007, 2:26pm » |
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Its not broken if you're getting compression.
unlikely the gaskets gone on all three cylinders..and even if it were it would still fire
Jumped chain possibly? or the camshaft sensor wiring?
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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Thunderchild
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My other car's an Aprilia
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Re: 24V firing on only 3 cylinders
« Reply #6 on: Mar 1st, 2007, 5:29pm » |
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Can you smell petrol on that side when you take the plugs out? I would think that if there's compression and a spark and the engine turns over reasonably smoothly, there should be at least some semblance of the cylinders firing. If not my bet would be a problem with the injectors on that bank or the fuel system to them.
HTH
Thunderchild
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solarpanel
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Re: 24V firing on only 3 cylinders
« Reply #7 on: Mar 1st, 2007, 6:26pm » |
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take the cam cover off and check chain cams etc
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Highlander
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13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
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Re: 24V firing on only 3 cylinders
« Reply #8 on: Mar 1st, 2007, 10:24pm » |
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He's got fuel on the sparkplugs when removed and a spark
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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