Spark plug Gap? Poor idle? 2003 4.0 Need HELP!
#1
Spark plug Gap? Poor idle? 2003 4.0 Need HELP!
My manual says something like .052-.056 spark plug gap, and the sticker under the hood says .062 - .065. It is currently gapped at the 0.65 area. After i had changed plugs and wire to try and solve a poor idle issue. Well that didnt help the idle so tonight i replaced the coil pack and it continues to idle rough. I did notice while in park in idles pretty good, but when i turn the lights on it gets worse an with the brights on even worse. Which makes me to think my plugs are losing spark performance with other things running. Also when in drive coming to a stop at a light the idle also run poorly.
Also changed the MAF, IAC Valve, and PCV valve to help fix the issue
- Would re gapping the plugs down a bit help?
- any other ideas?
Also changed the MAF, IAC Valve, and PCV valve to help fix the issue
- Would re gapping the plugs down a bit help?
- any other ideas?
#4
According to this article all 4.0L spark plugs are suppose to be gaped at 0.54. The Ford Ranger 4.0L Engine - The Ranger Station I would probably start by regaping them to that.
#8
Your O2 sensor would throw a code if its readings are outside the measuring thresholds. After driving your truck a few miles, get out and check if your catalyst is glowing....could determine if it's clogged or getting clogged and creating an exhaust blockage.
You can also pour 1/2-1 full bottle of 91% pure isopropyl alcohol in the tank and allow it to burn through. If there's any fouling or varnish in the cylinder head or valves, it should help burn it all off.
You can also pour 1/2-1 full bottle of 91% pure isopropyl alcohol in the tank and allow it to burn through. If there's any fouling or varnish in the cylinder head or valves, it should help burn it all off.
Thread
Thread Starter
Forum
Replies
Last Post