I see a black ring developing at the end of the.

DOES YOUR CHECK ENGINE LIGHT TURN ON WHEN YOU TURN THE KEY TO "ON", VERIFYING THAT IT WORKS?

DOES IT STAY ON CONSTANTLY WHEN IT'S RUNNING?

ARE YOU SEEING BLACK OR WHITISH/ GRAYISH SMOKE OUT OF THE EXHAUST WHILE YOUR BUDDY DRIVES AND YOU FOLLOW ALONG BEHIND IT........IN YOUR CJ 5?

SOUNDS LIKE YOU MAY BE WORRIED

THIS TEST WILL SHOW YOU THE CONDITION OF YOUR ENGINE, AT A GLANCE, WITHOUT DOING ANY EXPLORATORY SURGERY

https://www.2carpros.com/questions/2010-all-other-cars-how-to-change-gears-for-fuel

I ANSWERED THIS POST SOME TIME BACK, LINKING YOU WILL SAVE ME A LOT OF HUNTING AND PECKING

THERE ARE TWO LINKS IN THAT LINK----I JUST TRIED 'EM, AND THEY STILL WORK

MAKE SURE YOU GO TO THE BOTTOM OF THE 1ST ONE AND "CLICK AROUND" ON THE "SCENARIOS"----MOST OF 'EM ARE AT IDLE

RETURN HERE, WITHOUT WORRY, LET US KNOW, ALL IS WELL!

THE MEDIC