1997 XK8 shaking at idle HELP
#1
1997 XK8 shaking at idle HELP
On my 1997 XK8 the engine started shaking like crazy at idle. Not running good even at higher RPM's. It started after washing the car and engine. Maybe just a coincident. Anyway i thought maybe the computer got wet but it was all dry. I took all the the connectors off and cleaned them with electronic cleaner but no change. The computer shows no error codes. No check engine light. Any ideas???
#2
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toaster (04-30-2018)
#5
#7
If you washed the engine, there is a good chance some water got down into the spark plug holes in the valve cover gasket. Each plug has it's own tube/cylinder it fits down into, with a coil pack on top. Water can pool down around the plug and cause misfires.
Plenty of you-tube videos out there, always check the easy fixes first.
Plenty of you-tube videos out there, always check the easy fixes first.
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#8
For fuel trims, get an ELM327 Bluetooth OBDII scanner unit (Amazon, ebay, etc. if you don't have one already) and plug it into the diagnostics connector under the dash by the driver's door. Install Torque Pro app on a cell phone and pair (bluetooth) with the scanner. In Torque Pro, select realtime information and swipe right until you have a blank or near blank page. Touch and hold in a blank part of the screen until "add display" appears and press it. Select Digital display and scroll through the display items until you find Fuel Trim Bank 1 Long Term and select it to add it as a display. Repeat to add Long Term Bank 2 and short term bank 1 and bank 2 displays. Also add an Engine RPM display. You now have a real time Fuel Trim measurement page in Torque Pro (this may also work in the free version of Torque but I've never tried that).
Search "fuel trims" in this forum and you should come across a link for a nice tutorial explaining short and long term fuel trims as well as several threads which will give you an idea of what measurements you should see at idle and at 2500rpm.
Search "fuel trims" in this forum and you should come across a link for a nice tutorial explaining short and long term fuel trims as well as several threads which will give you an idea of what measurements you should see at idle and at 2500rpm.
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JagV8 (07-10-2017)
#9
If you washed the engine, there is a good chance some water got down into the spark plug holes in the valve cover gasket. Each plug has it's own tube/cylinder it fits down into, with a coil pack on top. Water can pool down around the plug and cause misfires.
Plenty of you-tube videos out there, always check the easy fixes first.
Plenty of you-tube videos out there, always check the easy fixes first.
Thanks again for all the help.
#10