3.0 V6 mystery: cracked head...blown gasket? - Ranger-Forums - The Ultimate Ford Ranger Resource
Ford Ranger Forum - Forums for Ford Ranger enthusiast!

Go Back   Ranger-Forums - The Ultimate Ford Ranger Resource Arrow Ranger-Forums Technical Engine Forum Arrow 2.9L & 3.0L V6 Tech

2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

LinkBack Thread Tools Search this Thread
Old 10-22-2013
Thread Starter

I am: Joseph Walsh
Join Date: Nov 2010
Location: Severn, Md.
Vehicle: 2000 Ford Ranger XLT
Posts: 1
Total Props: 0
3.0 V6 mystery: cracked head...blown gasket?

I need some help on diagnosing a problem that I'm having with my 160,000 mile 3.0 V6 automatic Ranger.
I started to get a noticeable misfire and, after more miles than I expected, the CEL finally came on.
Pulled the code: P306 - #6 misfire.
OK...simple enough. I was getting close for a plug & plug wires change anyway.
Plug #6 was a little wet and the porcelain was dark....not light beige like the other 5 plugs.
After installing new Motorcraft plugs & wires I still had a #6 misfire and, eventually a P306 CEL code.
Installed a new coil pack....same problem....misfire on #6.
It starts up and has a slight miss which goes away once the truck is warmed up, but under heavy load it misfires pretty badly.
Then I checked the coolant and it was very low plus was rusty brown. (I change the coolant regularly and it has never looked this bad before.)
Refilled the coolant and checked after a few trips:
Uh Oh....The truck is consuming coolant, but there is no smell, no leaks, no white smoke from the exhaust.
Pulled #6 plug and inspected....it doesn't look too bad and is not wet.
Next I did a compression check and all the cylinders read between 144.0 and 160.0.
Cylinder #6 shows a healthy 154.0....WTF!?
I was certain that I had a cracked head or blown head gasket.
Before I pull the top end down what else could cause this?

Last edited by 99XLT3.0; 10-22-2013 at 03:40 PM.
Reply With Quote
+ 0 -
Old 10-22-2013
I am: Tim Walsh
Join Date: Jun 2005
Location: Havertown,PA
Vehicle: 2010 Ford Sport
Drive Type: 4x2
Engine: 4.0
Posts: 431
Total Props: 0
This happend to my 02. Possibly bad valve.
Reply With Quote
+ 0 -

Similar Threads
Thread Thread Starter Forum Replies Last Post
cracked head? leaky head gasket? paranoia SuperGildo@RRP 4.0L OHV & SOHC V6 Tech 28 08-27-2008 10:43 PM
2.9 Blown Head Gasket Surgery, lil Help... pushdeck 2.9L & 3.0L V6 Tech 1 11-20-2007 05:47 PM
Blown head gasket? MRC 4.0L OHV & SOHC V6 Tech 8 05-20-2007 09:42 AM
Cracked head or blown head gasket rangerrob 2.9L & 3.0L V6 Tech 1 02-20-2006 01:23 PM
Blown head gasket or cracked head rangeon99 4.0L OHV & SOHC V6 Tech 20 12-04-2005 01:36 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -6. The time now is 04:44 AM.