Ok guys...I have a 97 4.6. I changed out my EGR valve because I was getting some low end hesitation, my old EGR valve looked awful so i just replace it. I sprayed carb clener by mistake up through the ports. When I started my truck, I got a check engine light, truck ran like crap. Went to auto zone, code said #4 misfire...changed out plug, 1 mile down the road, truck started missing and barely made it home. The plugs and wires have barely 10000 miles on them. Could I have a clogged injector?? Any help would be appreciated.

 

More than likely, it is the coil & not the plug. I have seen this many times. if you know it was the #4 cyl, & you replaced the plug, then replace the coil. this should fix the problem.

dell

 

You have a coil pak, not COPs so I wouldn't replace the coil yet. What kind of plug did you put in? Was it a direct replacement? You said you sprayed carb cleaner through the ports by mistake, are you talking about the port that the EGR is mounted too?

 

The '97 F150 is known to have these #4 cylinder misfires. First thing for you to do is run a search on this website for "#4 cylinder misfires". A lot of these models of trucks have bad head gaskets which leak antifreeze into a cylinder (#4 more than likely). You can search for "head gaskets" which will bring up this problem.

I'll bet more than anything you've been running short on antifreeze yet cannot find a leak. A lot of members here even had their engines sieze on 'em when they started their trucks up in the morning.

On my old '97, I ran into a similar problem....not the head gasket failing, but was leaking antifreeze into timing chain compartment.....$1,800.00 (not sure, been some years) later I finally found this site and swapped all old gaskets out for new ones.

I hope this is NOT your problem as it only turns out bad, either for the engine or your wallet.

Even if this isn't the problem, since you have a '97, still run a search on these topics...they are pretty interesting to read/know.

Good luck,

 

It's funny that you posted this. I have a 1997 4.6L myself, and I had a cylinder #4 misfire that started about a week ago; it went away completely, then came back yesterday. I had my friend who is a mechanic fix it today for me.

I did some brief looking around on the net and there seems to be more than one answer to fixing this, but in my case he needed to replace the EGR solenoid, valve, and some sort of EGR 'module' (controller maybe?). I admittedly don't know too much in the field of mechanics, but I hope this helps you out, at least maybe pointing you in the right direction. Total cost for me was about $225 in parts, and the truck runs like new again. Good luck, keep us posted.