I have been having an issue with spark knock...actually pinging on my 94 EB Explorer for some time now. Here is what has been happening to my explorer.
Over the last year I have had to add coolant to the system every 1 or
2 months as the radiator gets low. There are NO signs of any leaks anywhere so the usage must be internal.I have replaced the plugs, new IAC Valve, new TP Sensor, and a host of other things to keep the engine at top performance and have been satisfied with the performance.
I have become worried about the coolant usage especially since there is no outside indicator of a leak.
I am willing to take a couple days off from work in order to replace gaskets in the intake and possibly the head gaskets depending on what I find.
At this point I am trying to find out as much info about performing the task at hand. Any pointers from you guys will be appreciated. There is no doubt I am going to perform this task because if I do not I will for sure experience and engine failure. The intervals between which I have to add coolant are becoming more frequent.
Thanks,
Sam in Raleigh.