I'm about to buy a jeep grand cherokee but they said it misfires when first started up but it drives perfectly fine. What could this have to do with the jeep? And how much would it be to replace what needs to be fixed?
They said it might be the spark plugs.|||Misfires are tricky things, many problems can cause them. the most common is a fouled spark plug. although a bad coil or plug wire could be the culprit too. A bad or clogged injector is another simple fix. I could also be something more complicated and labor intensive, like a bad valve or cracked piston. I've seen all of these cause a misfire.|||I don't see why spark plugs would make it misfire just when it starts up. I would think it's maybe more of a valve that is not seating when you first start it because it is not hot enough to allow it to expand and seat properly in the head. If that's the case then you might just have to deal with the misfire until the jeep is properly heated up.|||The common problems with Jeeps that may cause this are the sensors (throttle and crank) and the fuel pump. These are not a big deal to fix, you just need someone who is competent enough to troubleshoot the problem correctly and not shotgun by randomly changing parts until the right ones are replaced.
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