1991 Dodge Ram Check Engine Light

Could be the ribbon on the back of the cluster, Loose wiring somewhere that is either rubbing something, creating an open, or short to ground. I would check codes and see if there are any 1st.

Pre OBDII chryslers you could flick the key on-off-on-off-on and pull codes from the dash lights.

You literally just turn the key on-off-on-off-on, not to the start position, but to the run position. Then be ready to count the flashes of the check engine light. If I remember right, 5-5, meant the start of the cycle, and then you got the codes, then 5-5 flashed again, meaning the end of the codes. Double check me via google. I could be thinking of GM.

Rereading my post, I see how it could be confusing. The check engine light will flash five times in a row, then a pause, then five times again. Then, it will flash another number of times, and pause, then another number. Example: It flashes 5 times, pauses, 5 times, pauses, that’s a 55, which is the normal start of the cycle. Then it might flash eight times, pause, and flash seven times. That’s a code 87. They will all be two digit codes. Once it flashes 55 again, it’s run it’s course, and will repeat.

http://www.extreme-check-engine-light-c … ecoder.htm

There ya go man, even better. I was wrong about the 55. It flashes at the end of the cycle. If it’s the only flashes you get, it means no codes are stored.

Obviously it won’t retrieve trouble codes. What I am suggesting is that a low oil level may be causing the trouble light to come on over rough terrain… it happened to me. My engine light started to flicker going over rough spots and in turns, turned out the cause was a cavitating oil pump/low oil pressure because of a low oil level.