Join Date: Jul 2015
Location: Ringgold Georgia
Bronco Info: 1995 EB 302, E40D auto trans, 4.11 grs, locker on rear diff. man. hubs, 3' body lift, 35" Toyo tires
Wow ! What a difference !
Ok first off, I am an idiot. I have owned my Bronco for the last three years and I have put off something I should have done a long time ago.
I have been searching for a fix for a bucking sensation when the truck is under a load and I had not been able to find it. I thought maybe my plug wires were crossed and acring across one another but I was not able to get much out of trying to fix it.
I Just did the Six litre tune up and my truck actually ran worse with the new coil, wires, rotor cap and button. I was confused with this turn of events. I decided to break down and borrow my buddy's timing light and check to see what my my timing was set at.
I climbed under the truck, cleaned off the rust on the harmonic balancer and darkened the marks with a sharpie pen and wiped off the excess ink. This made the marks show up pretty good.
Well, when I first checked it I found it at 2 degrees after TDC and then it jumped up to 2 degrees before TDC. Needless to say, it was not the proper setting of 10 degrees before TDC. I set timing to 10 degrees and went for a test run. Wow, my truck ran so much better! I really wish I had not assumed the PO had it set correctly. My bucking sensation and the pinging almost completely disappeared!
When I got back from my test run, I checked the timing again and noticed it was no longer at 10 degrees BTDC, it was around 20 degrees BTDC ! I couldn't figure out why the settings had changed. I even checked it with the spout removed and it still was fluctuating. I searched the forum and found a thread that mentioned a faulty temperature sensor can make the idle go up and down because the computer thinks the engine is cold and is choking the engine. I even saw the temp gauge in the cab do some funky hoping around lately so I think this assessment is probably going to the the right one.
So, I am going to order a new Motorcraft temp sensor and install it and then check / reset my timing once I know the temp sensor isn't fluctuating. Hopefully after that I will have a better, smoother running engine.
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