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1988 Ford Ranger - Page 4 Questions & Answers
What will make check engine light not come on?
I would look for a common item between the two. A mechanical failure of some sort will not always throw a code for example the fuel pump goes out , no code. the starter is bad no code. With those two I would check the ignition switch then trace from there until the common between the fuel and spark is found. Primarily if the computer is not getting voltage to it then neither one of those would work, That can be a starting point.
Codes po171 , po136
PO171 is the 1st o2 sensor on bank 1. With that said a vacuum leak will also throw this same code so before I go changing an o2 sensor I would completely go over the engine and look for a vacuum line or intake leak. PO136 is the o2 sensor bank 1 the second sensor in the exhaust. Again here are some of the things that can cause this code. ( I always look for a vacuum leak somewhere first)
Worn teeth on flywheel
Worn teeth on a flywheel are usually a result of a starter problem such as a drive or the starter not lined up properly or loose causing the starter driver gear to mismatch with the teeth on the ring gear. This eventually wears the teeth on the flywheel away. Transmission will have to be unbolted and moved back for enough room to work or completely taken out. The flywheel will need to be replaced or you can get a new ring gear cut the old one off , weld the new one on then balance it. Best just to get a new one unless you have a real shop. LOL Nowadays most mechanics just get a new one, less hassle and quicker plus I don't think half of these yahoos would know how to properly replace the ring gear anyway. Check your starter for damage also.
How to recharge ac system
Your system is most likely an R12 system and R12 is very expensive even if you are lucky enough to find it. Most older vehicles are being converted to 134A which you can buy just about any auto parts store, heck they even sell it at Dollar General. It was really cheap at first while there were still a lot of R12 units still on the road but the price has gone up since the R12 has been phased out. This presents a quandary as I don't know if you are just topping off your system or you have had to replace something. AC work should only be done by certified technicians. That said Auto parts stores have the simple can with a gauge for topping off a unit but if more work needs to be done then you have to have gauges, replace the dryer, valve, etc. also if the system has been opened to air. If you overcharge a system you will have too high a head pressure and destroy the compressor too low and it won't cool or the pressure switch will shut the clutch off or it will constantly cycle. There are Federal laws governing AC work plus it could be dangerous of course I would bet there are a ton of you tube videos.
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