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engine shakes on idle. coils?

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Old 07-03-2007, 07:33 PM
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Default engine shakes on idle. coils?
hello fellow jag owners im new to this forum. have a 02 jag s type 4.0 and my engine shakes a little when it warms up an is idling at a red light.(sometimes) changed plugs & fuel filter but now after reading previous posts i beleive it might b the coils. anybody know if this could b the cause(coils).
thanks
 
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Old 07-04-2007, 12:24 AM
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Default RE: engine shakes on idle. coils?
quite possible for the coils. a code scan should point you toward a misfiring cylinder.
look for vacuum leaks as well. brittle plastic lines will break if you fart too hard.
 
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Old 07-04-2007, 04:40 AM
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Default RE: engine shakes on idle. coils?
thank you.
 
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Old 07-04-2007, 08:26 PM
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Default RE: engine shakes on idle. coils?
big possibility, due to mainly valve cover gasket leaking, oil gets into
coils, recomend replacement on both valve covers and all coils, once one coil goes bad the rest follows.
 
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Old 07-05-2007, 12:57 AM
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Default RE: engine shakes on idle. coils?
true. i order 8 on ebay for $250. dealer wanted $1000, thanks again .
 
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Old 07-05-2007, 10:51 AM
vizcarra44
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Default RE: engine shakes on idle. coils?
Misfires can be caused by other things besides bad ignition coils, any how it can be very expensive to guess. What will you do if the misfire persists?
change all the injectors, ect. I dont own a shop or even work at the dealer anymore, but I am going to start a diagnostic shop as a hobby at my
friends used car dealership, free at first of course. But anyhow, guess right. And having an ignition scope is a life saver, at the dealer we had one guy replace an engine twice for a misfire that wouldnt go away, it ended up being a partially plugged cat converter, so case in point always test before guess.

Regards,

vizcarra44
 
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  #7  
Old 07-05-2007, 06:52 PM
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Default RE: engine shakes on idle. coils?
what would one have to listen for or look for if it were the cat? because i had a feeling it could be the catalyctic but saw oil on coil boots so figured they were fried. will check that though.
 
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Old 07-05-2007, 08:54 PM
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Default RE: engine shakes on idle. coils?
id fix the cam covers then buy one new coil... then when the cars is all back together and running rough... i usually.. change one coil at a time.. until the car runs good then you know you changed the right coil... then throw away the bad coil...
 
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Old 07-05-2007, 11:26 PM
vizcarra44
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Default RE: engine shakes on idle. coils?
Oil in plug wells sounds like its the problem, cat conv was a singular issue.
 
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Old 08-06-2007, 05:06 AM
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Default RE: engine shakes on idle. coils?
thanks guys, changed coils and shes running smooth again.
 
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Old 08-08-2007, 05:07 PM
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Default RE: engine shakes on idle. coils?
ORIGINAL: kiloslanga

hello fellow jag owners im new to this forum. have a 02 jag s type 4.0 and my engine shakes a little when it warms up an is idling at a red light.(sometimes) changed plugs & fuel filter but now after reading previous posts i beleive it might b the coils. anybody know if this could b the cause(coils).
thanks
My '00 4.0 S-Type has the same problem. Did the problem with coils throw a code (Check engine light)?
 
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