ANy ideas what this could be? rough idle as if missing a cylinder
ANy ideas what this could be? rough idle as if missing a cylinder
Last night did some spirited runs. Parked the car came back an hour later started the car, idle was rough and car was missing and rpm not moving fast as if I was missing a cylinder or two. No check engine light. restarted the car, all back to normal.
Thinking spark plugs fouled maybe... Other ideas?
Thinking spark plugs fouled maybe... Other ideas?
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2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 112.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 SC (Alpha Jag ECU, TCU tune, crank pulley), 600+ HP, 11.6 sec 1/4th mi 122mph, 7.6sec 1/8th mi
2018 Jaguar F-Type (AlphaJag ECU TCU, lower upper pulleys intake) 10.77 ,131mph ,700hp
2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 112.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 SC (Alpha Jag ECU, TCU tune, crank pulley), 600+ HP, 11.6 sec 1/4th mi 122mph, 7.6sec 1/8th mi
2018 Jaguar F-Type (AlphaJag ECU TCU, lower upper pulleys intake) 10.77 ,131mph ,700hp
Veteran Member
Joined: Aug 2016
Posts: 1,496
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From: Plano, TX
Last night did some spirited runs. Parked the car came back an hour later started the car, idle was rough and car was missing and rpm not moving fast as if I was missing a cylinder or two. No check engine light. restarted the car, all back to normal.
Thinking spark plugs fouled maybe... Other ideas?
Thinking spark plugs fouled maybe... Other ideas?
Senior Member
Joined: May 2017
Posts: 378
Likes: 96
From: Green Valley, AZ USA
It is hard to figure out an intermittent problem without any clues. Maybe you have a loose electrical connection to an injector or a spark igniter.
If the check engine light came on then DTC will have been logged. If you have SDD you could try retrieving the DTC anyway, to see if anything interesting was logged in the past.
If the check engine light came on then DTC will have been logged. If you have SDD you could try retrieving the DTC anyway, to see if anything interesting was logged in the past.
Veteran Member
Joined: May 2009
Posts: 27,519
Likes: 4,910
From: Yorkshire, England
