93 Civic EX 4dr Check Engine Light, no codes, overheating
I own a 93 civic ex 4dr (all stock) and have had a check engine light problem with my vehicle ever since I got it back from the mechanic. The original problem was the main relay which I had figured and resoldered but the other problem behind it was the black/yellow cable going from the main relay to the ecu which was out of place in the main relay harness.
Anyway, my new problem may be the reason why my civic feels like a gas guzzler... It gets about 15-17mpg!! It's a 5-speed and I usually let it roll whenever I can to save gas. The problem is that it seems like it's lost a lot of power on the freeway when I try to get to 5th gear. I spoke with a friend and he stated that my ecu was in "limp" mode. Supposedly during this time, it'll produce less power while having the gas run richer. I wouldn't call myself an expert about these things but would it be possible to resolder the ecu? I tried doing the famous paperclip shortening trick but it doesn't seem to work. I've spoken with some others who own the same generation and model of the civics and they have the same issue about not being able to read it on their speedometer.
2nd problem, my entire dash including the AC, fan, speedometer seems to be faulty with no bulbs turning on at night. The MPH gauge does not work at all which is caused by the speed sensor in the tranny from what a mechanic has told me. However, all the bulbs won't work either... This may contribute to the fact that the ecu does not throw codes out for me.
3rd problem, the 7.5V radio and clock fuse under the hood seems to have blown. I tried replacing it with another 7.5V and it sparked right when the two sides touched. I now have a 10V in there and it works fine.
4th problem, the car seems to overheat quite quickly after about 20-50 minutes of driving. The check engine light also usually comes on within 3-10 minutes after starting up.
I'd hate to go back to the mechanic and spend another few hundred to fix such a small problem I was getting around to anyway. Any help you guys may provide would be greatly appreciated.