2007 xkr misfire issue
#1
05-02-2018, 01:59 PM
2007 xkr misfire issue
Hello everyone. I recently bought a 2007 Jaguar XKR. It has 100,000 miles. The check engine light turned on. I pulled codes P0300, P0302, P0304, P0306, P0308, and P0316. It has a minor misfire at idle. And also when I accelerate i feel as if it hesitates. Any ideas or suggestions will help. And thank you all in advance. By the way, other then the misfire issue I love this car.
#2
05-03-2018, 01:39 AM
Senior Member
Since you have misfire codes all on the same (left) side of the engine, I am wondering whether you might have a failed engine head gasket which impacts all cylinders on that side. However, I would start by removing and inspecting the spark plugs since that is a relatively easy task. While the plugs are out, perform a cylinder compression check to verify whether any cylinders have a problem.
The iridium spark plugs should be replaced at 100K miles anyway.
https://www.jaguarforums.com/forum/x...system-191533/
The iridium spark plugs should be replaced at 100K miles anyway.
https://www.jaguarforums.com/forum/x...system-191533/
Last edited by Patrick Wong; 05-03-2018 at 01:43 AM.
#3
05-03-2018, 02:09 AM
#4
05-03-2018, 04:05 AM
Senior Member
The left side is the driver's side for a North American model. See the link in my prior post for the cylinder numbering.
The engine should be warmed up prior to performing the cylinder compression test. Remove the fuel pump relay. Start the engine and let it run until it stalls. Remove the spark plugs.
Install the compression tester in one cylinder. Crank the engine at least five compression strokes (hence, ten revolutions) and record the highest reading. Repeat for all cylinders.
The lowest cylinder should be within 75% of the highest cylinder. I don't see a specific compression pressure spec in the factory repair manual. My guess is that 150 psi would be about right for a new engine.
The engine should be warmed up prior to performing the cylinder compression test. Remove the fuel pump relay. Start the engine and let it run until it stalls. Remove the spark plugs.
Install the compression tester in one cylinder. Crank the engine at least five compression strokes (hence, ten revolutions) and record the highest reading. Repeat for all cylinders.
The lowest cylinder should be within 75% of the highest cylinder. I don't see a specific compression pressure spec in the factory repair manual. My guess is that 150 psi would be about right for a new engine.
Last edited by Patrick Wong; 05-03-2018 at 04:19 AM.
#5
05-03-2018, 04:17 AM
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#7
05-03-2018, 06:18 AM
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#9
05-04-2018, 07:55 AM
Veteran Member
Put the car on a lift or jack stands and either pull the front o2s, start the car and compare the exhaust pressure coming out of the ports or pull the muffler and mid pipe off and do the same at the down pipes. The clogged cat will have huge pressure out the o2 port and minimal out the back. You should also be able to tell from heat with an I/R gun comparing the temps before and after the cat. Magnaflow makes cat downpipes for $370 off Summit Racing. Should be OK as long as you aren't in Commiefornia.
If you like the car now, you'll be amazed once it's running on more than 4 cylinders.
If you like the car now, you'll be amazed once it's running on more than 4 cylinders.
#10
05-04-2018, 02:49 PM
Thank you so much. I will lift it and check the cats tomorrow afternoon. Also I put the code reader on today in the morning and now it also has code P0305 and P0442 on top of the other codes. I forgot to mention that when I first start it in the morning, it has a riugh idle then kind of evens out onve its warm. You still feel a slight misfire once warm but its hatdly noticeable. But when first started it idles pretty bad.
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