CaptainoftheSSRoughService Posted June 9, 2024 Share Posted June 9, 2024 Good evening, I'm having an issue with my navigator. I've had no issues really and it has 87k miles. Anyway, This issue I am having is when I do a cold start, it's a bit rough when I crank. No issues afterwards, drives like a dream minus the crummy roads I drive on in my home state. However, just that cold start is rough. The coolant was low..I mean very low and it was never topped off at the oil change, and I'm not sure if that's played a part. I have no warning lights, no other issues, no smoke, no skipping gears, or anything else. I read the manual about fuel and performance so I switched and hoping that works. Any ideas? Anytime I crank up afterwards, there are no issues whatsoever, it cranks up perfectly fine and very smooth. It's just that first crank in the morning Quote Link to comment Share on other sites More sharing options...
Chrisgb Posted June 10, 2024 Share Posted June 10, 2024 I don't know what engine you have, or how cold is cold, but generally, worn or fouled spark plugs could be the issue. At 87k it is probably due for new plugs. A cold start, regardless of the actual temperature, usually means a richer fuel mixture than at normal operating temps; think choke. Old plugs may initially have a harder time firing the richer, more dense fuel mixture. Old plug wires and coils can cause misfiring, but this would tend to be constant over all rpms. Quote Link to comment Share on other sites More sharing options...
Turd Ferguson Posted August 13, 2024 Share Posted August 13, 2024 (edited) There is a known defect in the cam phasers that produce a loud rattle at cold start. It was fixed in 2022. Your powertrain warranty is up, but it would've covered the replacement with the newer cam phasers. Our '18 navigator started doing this at 10K miles. Just took it in to our ford dealer and it was fixed in three days. Now purrs like a kitten at startup. I've read that the rattle is only a nuisance and doesn't cause any harm to the engine. Edited August 13, 2024 by Turd Ferguson Quote Link to comment Share on other sites More sharing options...
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