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Police State
Original Poster
3,302 posts
89 months
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one of our cars has a faulty coil pack (4 cyl), and the engine is running rough. The quick question is can it be driven 50 miles with a lumpy engine, or am I asking for more trouble?
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Defcon5
4,056 posts
60 months
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Should be fine if you take it steady - try cleaning the connections, may improve it a bit
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Police State
Original Poster
3,302 posts
89 months
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Defcon5 said: Should be fine if you take it steady - try cleaning the connections, may improve it a bit thanks for the quick reply.
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powerstroke
1,719 posts
29 months
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Police State said: one of our cars has a faulty coil pack (4 cyl), and the engine is running rough. The quick question is can it be driven 50 miles with a lumpy engine, or am I asking for more trouble? Not a great idea as unburnt fuel might cause the cat to overheat and melt .....
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stevieturbo
8,363 posts
116 months
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Depends entirely on the car.
If it has a catalytic converter which virtually all do these days, then yes you are asking for more trouble.
Dumping raw fuel into the car is a surefire way to kill it.
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Deva Link
26,916 posts
114 months
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I would say that's way too far to run the car on 3cyls.
If you absolutely have to do it then unplug the injector for that cyl.
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Police State
Original Poster
3,302 posts
89 months
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powerstroke said: Not a great idea as unburnt fuel might cause the cat to overheat and melt ..... hmm, that's interesting and crucial to know as it has only just had a new replaement cat fitted.
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Defcon5
4,056 posts
60 months
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Is it definately the coil pack? What car is it?
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TheEnd
12,088 posts
57 months
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A lot of cars are smart enough to switch off fuel injection to a cylinder if there is no ignition.
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C. Grimsley
540 posts
64 months
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TheEnd said: A lot of cars are smart enough to switch off fuel injection to a cylinder if there is no ignition. Echo this, the car will record a misfire on which ever cyl and kill the suppliy to the fuel injector, it will be slow but ok. Carl
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stevieturbo
8,363 posts
116 months
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C. Grimsley said: Echo this, the car will record a misfire on which ever cyl and kill the suppliy to the fuel injector, it will be slow but ok.
Carl No, the car may detect a missfire and shut down the injector. But you dont know what car, and you dont know for sure that it will. If it doesnt and it f  ks his new cat...it's an expensive replacement.
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powerstroke
1,719 posts
29 months
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stevieturbo said: C. Grimsley said: Echo this, the car will record a misfire on which ever cyl and kill the suppliy to the fuel injector, it will be slow but ok.
Carl No, the car may detect a missfire and shut down the injector. But you dont know what car, and you dont know for sure that it will. If it doesnt and it f ks his new cat...it's an expensive replacement. Yes ditto this and the OP has already fitted a new cat!! maybe a misfire or EM problem caused the old one to go tits up, they rarely just fail often its mecanical damage from say grounding on a speed hump or oil or unburnt fuel overheats them.... 
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Mr2Mike
9,452 posts
124 months
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Even with the injector unplugged on the faulty cylinder the high oxygen content in the exhaust will likely cause the ECU to overfuel the working cylinders to try to get correct exhaust oxygen levels.
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