Thanks for the tip on the cps.
Gas filter changed about 4 months ago trying to troubleshoot this problem. Didnt seem to have an effect.
@sidneyhop -
No problem - just asking the obvious since I saw no mention of the gas filter. Quite often the $15 Gas Filter is left out of the process, more than likely due to it's beer can size that gives the impression "how can that be clogged"?
So - back in December, out of the blue, my Ex started experiencing some lousy city gas mileage issues - and I take the same route every day. Additionally, just as you are experiencing, my Ex wasn't starting instantly when I cranked the key. Both problems occurred at the same time so I knew something was up.
Looked at the basics; My situation at the time was that the Ex had a Replacement Motorcraft Coil, Motorcraft Wires, and Double Platinum Champion Plugs and all parts had less than 10,000 miles on them. Also - no issues with the
Camshaft Position Sensor making "squeaking" noise (Distributor Type Part located at the back of the engine on the 4.0 OHV). Less than year old brand new TYC fuel pump from Rock Auto and Motorcraft Fuel Filter - both replaced at the same time. Fuel Injectors are cleaned every 6,000 Miles with my pressurized fuel injector cleaner that hooks up to my Ex's fuel rail. IAC Valve & MAF Sensor are cleaned at every 3,000 Mile Full Synthetic Oil Change. That ruled out all of those parts and subsystems. So I was left with the factory original Crankshaft Position Sensor...
So, I cleaned & inspected the factory original
Crankshaft Position Sensor that had over 205,000 miles on it, drove it for two weeks, the two problems that I was experiencing remained the same. Then a third problem cropped up. On two separate days, on the same route I drive everyday to work every day, on a steep grade I take in 3rd gear, my Ex coughed out a single slight misfire (with no check engine light afterwards). That sealed the deal for me...
Bit the bullet (lol), and handed over $20 to Rock Auto, to replace my factory Crankshaft Position Sensor with the Standard Motor Products offering. First thing I noticed when swapping out the factory original was that the new replacement's magnet was like a "super magnet" compared to the factory original.
After replacement - and all 3 problems cleared up instantly. Ex is back to starting on 1/2 to 1 revolution, City gas mileage back to normal (16 mpg on winter blend), and no more slight misfire on my daily driven steep grade. Additionally, the engine is slightly smoother at idle...
Here's a 5% off discount code for Rock Auto if you decide to pull the trigger ;-)
5% Discount Code: 1191391E850C2F
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Hope that helps and as always, Your Mileage May Vary! ;-)