What could be the problem

20

Asked by Montrell Dec 20, 2018 at 02:36 PM about the 2004 Lincoln LS V6 Luxury

Question type: Maintenance & Repair

When I start the car cold the car shakes badly the
break pedal is hard and when in drive there jerking
as well but when the car wars up it runs fine.

I’ve replaced o2 sensors all 6 coil packs fuel pump
fuel filter temp sensors and the problem is still
there any suggestions because the code reader is
saying misfire on all cylinders when the car runs
and drives fine then only reads bank one sensor
one which is my o2 sensors can someone help
please!!!!

3 Answers
42,940

Hornet_2497 answered 5 years ago

The hard brake pedal means that there is (for a while) a massive air vacuum leak, The power brakes rely on good vacuum. The massive air leak could cause all cylinders to misfire due to an extremely lean mixture. The brake booster may have a leak but that normally is constant not intermittent. Maybe your AIC air idle control valve is momentarily letting in an uncontrolled (large) amount of air. You'll have to go over all the vacuum intake air hoses and controls for a problem. Scan is good to do but in this case it shows the result...not the cause. Look for leaks.

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