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Turns out I had two cracked spark plug insulators, presumably from when I removed them from the heads when the heads were on the bench..... Sometimes its the basic things <grin> glad it is fixed Dave Frank

The "Nut' between the fan & the pulley turns COUNTERCLOCKWISE to loosen, same way any other nut turns.... The 'special' tool holds the pulley w/four bolts stationary during this procedure. The HAPLESS ILLFATED DIY'er who tries turning it clockwise to loosen it is just jamming it tighter &...

Problem Fixed !! Turns out I had a cracked insulator on the No. 6 Spark plug. I went ahead & pulled all six plugs & found a small crack on another of the insulators as well. My guess is that I cracked them when I removed them from the Cylinder heads (Heads were on the bench) Spark plug...

Just replaced head gaskets on 91 Explorer. Runs fine for the first few minutes when cold, but as soon as it warms up it has VERY poor accelleration. CEL is not lit. I ran codes & get RPM Idle out of range (code 12 & code 13) ON KOER. all other codes normal & Base timing correct At idle...

Just replaced head gaskets on 91 Explorer. Runs fine for the first few minutes when cold, but as soon as it warms up it has VERY poor accelleration. CEL is not lit. I ran codes & get RPM Idle out of range (code 13 & code 14) ON KOER. At idle, the engine sounds fine, but the exhaust out...