Misfire on cylinders 2 and 6
#1
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Misfire on 2 and 6, occurred at hiway speeds, limped it home now fails to start. Removed both o2 sensors, no start, swapped coils no start. Weak injector pulse, pull plugs on bank 2 after a few no start cranking, plugs look dry. Can smell fuel, fuel pressure 50 psi at rail.
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2004 S-Type 4.2 (added by GGG)
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2004 S-Type 4.2 (added by GGG)
Last edited by GGG; 11-27-2020 at 02:06 AM. Reason: Add Model & Year details
#2
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Misfire on 2 and 6, occurred at hiway speeds, limped it home now fails to start. Removed both o2 sensors, no start, swapped coils no start. Weak injector pulse, pull plugs on bank 2 after a few no start cranking, plugs look dry. Can smell fuel, fuel pressure 50 psi at rail.
#3
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Welcome to the forums Randys_Jag,
I've moved your question from General Tech Help to S-Type forum. This is the place to post technical questions about your model.
Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.
Graham
I've moved your question from General Tech Help to S-Type forum. This is the place to post technical questions about your model.
Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.
Graham
#4
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Misfire on 2 and 6, occurred at hiway speeds, limped it home now fails to start. Removed both o2 sensors, no start, swapped coils no start. Weak injector pulse, pull plugs on bank 2 after a few no start cranking, plugs look dry. Can smell fuel, fuel pressure 50 psi at rail.
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2004 S-Type 4.2 (added by GGG)
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2004 S-Type 4.2 (added by GGG)
Also, why you'd swap coils around in a no-start?
Check the battery / power thoroughly.
When was the fuel filter last changed?
#5
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Removing upstream o2 sensors on a no start illuminates exhaust system as a problem.
As previously stated, misfire on 2 and 6, swapping coils tests to see if misfire jumps to different cylinders..
Changed fuel filter last year, under 6k miles ago.
Gonna hook manual fuel gauge to fuel rail tomorrow to verify correct pressure and volume and fuel rail pressure sensor reading.
checking for correct voltage and grounds at injectors tomorrow also.
Dry plugs after extended cranking and testing along with noid light flashing dimly indicates dropping voltage while cranking.
Lincoln LS vehicles had coils shorting out and zapping the pcm and at the same time blowing up the coils.. didn't see that here..
Expect fuel issue due to dropping voltage to injectors while cranking. Possibly a ground issue due to more then one cylinder being dry and all injectors share the same ground circuit. Sharing my diag results and a seasoned Jaguar tech would know of a common issue with vehicle.
As previously stated, misfire on 2 and 6, swapping coils tests to see if misfire jumps to different cylinders..
Changed fuel filter last year, under 6k miles ago.
Gonna hook manual fuel gauge to fuel rail tomorrow to verify correct pressure and volume and fuel rail pressure sensor reading.
checking for correct voltage and grounds at injectors tomorrow also.
Dry plugs after extended cranking and testing along with noid light flashing dimly indicates dropping voltage while cranking.
Lincoln LS vehicles had coils shorting out and zapping the pcm and at the same time blowing up the coils.. didn't see that here..
Expect fuel issue due to dropping voltage to injectors while cranking. Possibly a ground issue due to more then one cylinder being dry and all injectors share the same ground circuit. Sharing my diag results and a seasoned Jaguar tech would know of a common issue with vehicle.
#6
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Your car's PCM electrics etc have essentially nothing in common with the LS.
#7
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+1 on checking battery voltage across the terminals with the ignition in the OFF position. Use a voltmeter to determine the voltage; it should be a minimum of 12.6 volts.
Use a smart phone with the Torque app to communicate with the PCM through the OBD port via a Bluetooth interface. Fuel pressure should be around 3 bar with the ignition ON prior to engaging the starter motor.
Use a smart phone with the Torque app to communicate with the PCM through the OBD port via a Bluetooth interface. Fuel pressure should be around 3 bar with the ignition ON prior to engaging the starter motor.
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#8
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If you can't see the immense similarities between the 04 Jaguar and the 04 Lincoln LS you may want to get some glasses. The drive trains are SO similar in many many ways. Some of the issues the LS was having in the field were repaired with Jaguar parts given to me directly by Ford engineers.
. As far as removing, not disconnecting, the upstream o2 sensors. If the exhaust is restricted enough to almost totally kill any engine performance , by removing the sensors and testing, opens the exhaust up enough to allow the engine to run. If engine still fails to perform or run, reinstall sensors and move forward in diagnosis. Simple test easy to do, rules exhaust out as the problem.
. As far as removing, not disconnecting, the upstream o2 sensors. If the exhaust is restricted enough to almost totally kill any engine performance , by removing the sensors and testing, opens the exhaust up enough to allow the engine to run. If engine still fails to perform or run, reinstall sensors and move forward in diagnosis. Simple test easy to do, rules exhaust out as the problem.
#9
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The LS and 4.0 S-Type have plenty in common but your car is a 4.2 - and the PCM and associated electrics etc are dramatically different.
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@Randys_Jag, what is the battery voltage across the terminals with the ignition in the OFF position when checked with a voltmeter?
Use a smart phone with the Torque app to communicate with the PCM through the OBD port via a Bluetooth interface. Fuel pressure should be around 3 bar with the ignition ON prior to engaging the starter motor.
Use a smart phone with the Torque app to communicate with the PCM through the OBD port via a Bluetooth interface. Fuel pressure should be around 3 bar with the ignition ON prior to engaging the starter motor.
#14
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Misfire on 2 and 6, occurred at hiway speeds, limped it home now fails to start. Removed both o2 sensors, no start, swapped coils no start. Weak injector pulse, pull plugs on bank 2 after a few no start cranking, plugs look dry. Can smell fuel, fuel pressure 50 psi at rail.
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2004 S-Type 4.2 (added by GGG)
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2004 S-Type 4.2 (added by GGG)
weird u could drive home but now wont stop. Almost seems like fuel pump was going and now its gone. So definitely check fuel pressure w gauge if theres a port to connect to.
can you get gas out the valve thingy?
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Takes all sorts I suppose.
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