02 altima 145,000 miles, original owner. serviced regularly (like clock work) misfires at 74 mph then 'service engine soon' light comes on. battery terminal connector changed, different gas used w/less than 2 gal in tank, new spark plugs. ran great for 2 days then 74 mph reached, misfires and service light back on...any suggestions (other than to drive at 73 mph!)
If you get ck engine light on , you have a cyl. number
that misfires , ck vacuum leaks on intake manifold around that area aspecially intake manifold gasket.
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Do you know which code is being stored after the service light comes on? Also which engine is in it?
what is the code it saying?
Do you have a code from the check engine light? Your local auto parts store should be able to loan you a code reader/scanner tool either free or on the cheap. From your description I'm willing to bet it is an issue with either your fuel delivery or your coil pack. (either an injector is fouled, or one of your coils is on the fritz) There are a host of other possibilities, however that's where I would start. some things to consider: When was the last time, or have you ever replaced the mass airflow sensor? (They do weird things to many cars when they fail) Is it completely missing? (no spark) Are you accelerating when it happens? (fuel/air) Does it continue missing afterwards? (fuel/air/spark) if you are going 68 +- at the top of a hill, spike the pedal and then let the engine decelerate, does it still misfire @ 74? (problem with ECU "governor")
You said the check engine light comes on. What code number are you getting?
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