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A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Lincoln
Satisfied Customers: 6164
Experience:  ASE Master Certified. ASE Gasoline Engine Performance Certified,Ford Senior Master Technician
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I have a 2001 Lincoln town car running rough I've replaced

Customer Question

I have a 2001 Lincoln town car running rough I've replaced plugs and cop and still is running rough any suggestions?
JA: Tell me a bit more about what's going on so he can help you best.
Customer: when the problem first started I had a P0301 & p0305 code.
JA: Are you hoping to fix this yourself?
Customer: yes
JA: Great! What have you tried so far?
Customer: plugs and coils.
JA: Is there anything else the Lincoln Mechanic should be aware of about your Lincoln?
Customer: no
JA: Our top Lincoln Mechanic is ready to take your case. Just pay the $5 fully refundable deposit and I'll fill the Lincoln Mechanic in on everything we've discussed. You can go back and forth with the Lincoln Mechanic until you're 100% satisfied. We guarantee it.
Submitted: 7 months ago.
Category: Lincoln
Expert:  A. Penland replied 7 months ago.

Are the codes P0305 and P0301 still coming back after you clear them with the code reader/scan tool?

Customer: replied 7 months ago.
no codes have come back.
Expert:  A. Penland replied 7 months ago.

Is it missing at idle or while accelerating?

Customer: replied 7 months ago.
idling and get rougher when you put in gear,
Expert:  A. Penland replied 7 months ago.

OK. You can isolate the cylinder by starting the engine and one at a time, unplug one injector and see if the engine runs the same or worse. Then plug it in and go to the next one. If it runs worse, that cylinder is good. If it doesn't change, that is the bad cylinder.

Customer: replied 7 months ago.
seems the same with #1 off but how I check the other side with breather in the way?
Expert:  A. Penland replied 7 months ago.

Check both banks, especially #5 since #1 did not change anything.

Customer: replied 7 months ago.
okay seems a little rougher with 5 unplugged.
Expert:  A. Penland replied 7 months ago.

Ok. Swap parts one at a time and see if there is a difference.

First swap the coil from #1 to #2 and retest. Then the spark plug and then the injector. See if the miss moves to cylinder #2. If nothing changes, then do a manual compression test on that side and see what the compression s. Should be around 175 PSI per cylinder.

These steps are only labor and no new parts to isolate the cause of the miss.

Customer: replied 7 months ago.
I have already replaced all the coils so maybe just switch the injectors?
Expert:  A. Penland replied 7 months ago.

You can try that. But also check the spark plugs. One may have been cracked which can cause a miss fire.

Customer: replied 7 months ago.
I did spark plugs also.
Expert:  A. Penland replied 7 months ago.

Swap the plugs between #1 and #2 and see if the miss moves to #2. The spark plug porcelain could have a crack in it which would effect the spark. Moving them will eliminate them from the cause of the problem.

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