slow down light flickering 1988 mondial conv

Slow Down Flicker

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When my 1988 Mondial cab started to flicker the slow down light, but was otherwise running fine, here's what I did:

At the cat, remove the temperature probe sensor (just undoes with a 10mm wrench). Use a small brass wire brush and give it a light surface cleaning. Be gentle, it is an expensive item. In the trunk, on the right behind the carpeted cover (a couple of screws to remove), there is the other end of the cloth woven/braided wire from the cat sensor, that goes into a "black box". This is the ecu brain for the cat sensor. Take off the connectors, there are two bullet type connectors, use some radio shack electrical cleaner, and then put on the some DeOxit or Stabilant to ensure good connection. If you are inclined, put DeOxit on the relays and other connectors in there, probably prevents other electrical problems.

This worked for me. Of course, it could be something more serious, but if the car runs ok, flickering means it is simply the connection. The sensor or the ecu itself might be shot, but not much to go wrong unless the wire is cracking (it does take alot of heat), which you would spot visually. If it is the cat ecu, more big bucks, but it does serve an important function of letting you know if a bank of cyliders fails (probably from a coil failure, which is not that uncommon as the cars age), and raw gas pumps into your cat, potentially causing a serious fire. Such is the price of a racing design with two distributors...

 

My 88 1/2 3.2 had a flickering light also. When I put on a cat bypass pipe, it never flickered or illuminated again. It also ran a hell of a lot better, so maybe my cat was beginning to clog up or deep six altogether.