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Amedee, Former ASE Master Tech
Category: Car
Satisfied Customers: 26461
Experience:  ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
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2002 Lincoln LS: V8 115,000 miles...rpm needle drops a half inch..miss

Customer Question

2002 Lincoln LS V8 115,000 miles.. While cruising along at 55-60 , feels normal but with even the slightest bit of pressure on the accelerator , the rpm needle drops a half inch and the car seems to miss and buck. Press down about an inch further and it smoothly accelerates. same in D5 or manual 5. No check engine light , checked for codes, no codes! Noticed this months ago slightly now it has become pronounced. Any Ideas ?
Submitted: 7 years ago.
Category: Car
Expert:  Amedee replied 7 years ago.
Hello there!

The only thing I can think if is the egr ports plugged up on some cylinders causing all of the exhaust gases to go to only a few cylinders causing slight misfires. If this is the case, you can disconnect the vacuum line to the egr valve or the electrical part of the egr system and take it for a test drive and see if the problem goes away.
Customer: replied 7 years ago.
Thanks anyway, wasn't that...turned out to be bad COP , 3RD one in on drivers side.t completely failed later in the day and made itself obvious. looks like i have to do valve cover gasket/ o ring job.
Expert:  Amedee replied 7 years ago.

THat will do it!

In fact this is very common! You would think it would light the check engine light :)
Customer: replied 7 years ago.
The check engine light did finaly come on when the COP got worse.. then the code tester pointed to a cylinder misfire. found all of the left plug wells wet with oil. .. Can i withdrawl my qustion ?
Expert:  Amedee replied 7 years ago.



That will do it!


Glad to hear its fixed!