In my search for a good automotive oscilloscope, I decided to test out what I already have on my bench. The Tektronix THS720A has been a great bench scope. In this video I look at the IAC waveform to see if it’s ok. This 1988 XJ has high idle problems.
Category: Engine
1986 XJ 2.5L Clutch Chatter Repair. Part 4.
Made a couple of small Jeep specific tools for pulling a broken index pin from the rear of the 2.5L engine block. The broken pin kept the engine and trans from mating perfectly to each other. In fact it left a gap between them. I modified an air tool hose fitting by taping the inside with a 1/4-20 thread. A 1/4-20 bolt screws the slide hammer to the air fitting, allowing the slide hammer to pull the damaged index pin from the engine block.
1988 Jeep XJ 4.0 Knock Repair. Part 13. Knocking Cured !!
Engine is running very smoothly and quietly. The power is so good compared to before all of the work !!! After being stuck in the garage for over 7 months, The XJ is out being test run daily !!
Blog: http://rotordesign.com/jeep/
Here is the rest of the Knock Repair Series: https://www.youtube.com/watch?v=X7uHI24cXfc&list=PLCyDzy-NaUwIhZmxHzIv0SJRHACQRIjSx
1988 Jeep XJ 4.0 Knock Repair. Part 12. Pump Primed !!
The cordless drill on low range did a great job of spinning the oil pump in order to prime the engine !! Used a piece of rod with .160″ thick flat blade ground onto one end, that fit into the pump. As you can see the as the rocker arms filled up with oil, the air was purged from the engine oil galleries.
Had to get the stuck on oil filter off before the oil pump priming took place. Made an oil filter removal strap from a cheap 5/8″ deep socket and a piece of ratchet strap material. Cut a slot in the socket to allow the strap material to slide into it.
Blog: http://rotordesign.com/jeep/
Here is the rest of the Knock Repair Series: https://www.youtube.com/watch?v=X7uHI24cXfc&list=PLCyDzy-NaUwIhZmxHzIv0SJRHACQRIjSx
1988 Jeep XJ Knock Repair. Part 11. Head Torque & Tool Mod.
Had to modify a couple of sockets so that the rear most head bolt could be reached with a torque wrench. It worked !! I used a 5/8 spark plug socket and a 3/4 socket to drive it with. Both were shortened with a band saw. All of this ensured the rear bolt could be fully torqued to 110 ft-lbs, along with the rest of the head bolts. 2 bolts required thread sealant, so they only get 100 ft-lbs of torque.
Blog: http://rotordesign.com/jeep/
Here is the rest of the Knock Repair Series: https://www.youtube.com/watch?v=X7uHI24cXfc&list=PLCyDzy-NaUwIhZmxHzIv0SJRHACQRIjSx