reverse polarity
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Joined: Jul 2010
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From: italy
Re: reverse polarity
Cat rattle may be there but you can see the tach drop when it happens so is definitely a misfire. Now the question is "why" ?
For instance if you rev it in neutral then let it drop back to idle does it go away or come back ? When driving does it feel down on power or rough when accelerating particularly around 50 mph/80kph ?
Did it happen suddenly, of has it been coming on for a while ?
Does the exhaust tip have oil in it ? (Looked shiny/black in video).
Hate to be asking 20 questions but have to narrow it down. That video was brilliant and a real help. Thank you.
For instance if you rev it in neutral then let it drop back to idle does it go away or come back ? When driving does it feel down on power or rough when accelerating particularly around 50 mph/80kph ?
Did it happen suddenly, of has it been coming on for a while ?
Does the exhaust tip have oil in it ? (Looked shiny/black in video).
Hate to be asking 20 questions but have to narrow it down. That video was brilliant and a real help. Thank you.
I dare not walk in these conditions so I can not tell you at the helm, I do not think there is no leakage of oil or fuel, again using a starter after several attempts part correctly, perhaps the highest voltage is able to give more power to the spark plug or coil defective
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Joined: Apr 2010
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From: Mendocino, CA
Re: reverse polarity
at bosch car service for (1) week............ What is the diagnosis please??
Thread Starter
Joined: Jul 2010
Posts: 157
Likes: 1
From: italy
Re: reverse polarity
since he parked them the problem has not arisen game is always correctly and no errors that the ceck, now the car has been parked outside the shop in the cold and must remain firm until Monday in the hope that the defect occurs and ceck to see what the problem is
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Joined: Oct 2013
Posts: 2,152
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From: Orlando
Re: reverse polarity
Sorry, that was a joke about cars that are supposed to be repaired and are just left in the parking lot.
If it were here I would connect a few data recorders and monitor all of the sensors when it happens. Used to be a good garage would have a big Sun Oscilloscope that could match a trace of the spark going to each cylinder.
Unfortunately the Crossfire seems to have an early form of OBD-II, my Jeep will record misfires by cylinder but the CF doesn't seem to. If it were to go on for a while I'd bet a cheap IR thermometer could pick out which cyl is misfiring (exhaust port will be cooler than others).
Gut feeling is that you have a weak secondary ignition - once it starts does it drive OK or feel down on power sometimes ? Mechanical issues usually do not heal.
Once I had an E-type with a plug that would not fire under 3,000 rpm. Made for very interesting sounds.
If it were here I would connect a few data recorders and monitor all of the sensors when it happens. Used to be a good garage would have a big Sun Oscilloscope that could match a trace of the spark going to each cylinder.
Unfortunately the Crossfire seems to have an early form of OBD-II, my Jeep will record misfires by cylinder but the CF doesn't seem to. If it were to go on for a while I'd bet a cheap IR thermometer could pick out which cyl is misfiring (exhaust port will be cooler than others).
Gut feeling is that you have a weak secondary ignition - once it starts does it drive OK or feel down on power sometimes ? Mechanical issues usually do not heal.
Once I had an E-type with a plug that would not fire under 3,000 rpm. Made for very interesting sounds.
Last edited by Padgett; Jan 10, 2014 at 02:47 PM.
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