VX shift light question
I searched for a post on this but didn't find a good match. When I got by VX about 1700 miles ago I got FE in the low to mid 30s. Since then I've put the correct plugs in, installed and calibrated the TPS, new O2 sensor and cleaned the eavc (leaking air internally) and will replace it this week. So far I've cured the engine lag and I suspect that the new eavc will bring the idle under control. To date the best tank I've gotten is 43mpg and yesterday it came to 37mpg. Not bad for a Civic but crappy for a VX.
I've noticed since I got the vehicle that sometimes the shift light works and at times it doesn't. I use my car for running the same 120 mile RT route 4 times a week and I've noticed that on the trips where the light isn't working my gas mileage really stinks and I can watch that gas needle drop. On trips with the light working the needle barely moves and if in a given tank the light works a lot, I can count on decent mileage. When the light doesn't work so much the car consumes a lot of gas. Maybe I'm crazy, but its starting to bug me a bunch. I drive the same route the same way and FE is sometimes great and sometimes it stinks. I am aware that the gas gauge isn't exact and that the first part of the tank goes farther than the last. Trust me that is not the issue here, I've had plenty of vehicles with these kind of gauges and this is not causing the variance in distance travelled per gallon. So can the light issue be indicative of an underlying problem, maybe a bad ECU? Does this sound familiar to anyone? I hate to spend more money on a car that is supposed to save me money, but if that what it takes to get the most from this thing then I'll try it. Thanks. :confused: |
Oh yeah, one more thing.... when the light is working the engine actively hunts for a good idle speed (it goes up and down) when in neutral. When the light isn't working the engine idle remains high and doesn't hunt.
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Maybe the light being on or off has to do with ecu having a code? I'm not sure really, but assume your CEL light on the cluster is burnt out, and try jumping the service connnector to see if there is a code stored in the ECU.
On my VX the shift light has never worked, hopefully I'll have success removing the dash bezel to fix it soon. |
my shift light is pretty wonky too. I don't need it tho, do you? Shift by your speedo, not your tach, for best FE. On flat it should go something like this if you have the '92-'93 civic VX (I believe higher mph shift points on the '94 '95 VXes)
shift into 2nd gear at 12mph shift into 3rd gear at 20mph shift into 4th gear at 25mph shift into 5th gear at 31mph Seems rather unlikely your shift light alone is affecting your FE. You say you are not changing at what speed you are shifting gears when the light is not working? I am going to replace my ECU on my car in a few weeks. I will let you know how it goes! My idle is still high and I think it's the ECU. |
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the shift light works on vacuum pressure. if the vacuum is low and you are not in top gear, the light will come on.
a vacuum leak would stop it from working. when you replace the eavc then i suspect your fuel economy should get right back to where it is supposed to be in the mid to upper 40s. good to see that you turned that vx around!! also, what are the tires you have on there? a cx, vx, or hx with a tire with that would belong on any other civic or integra will cost you at least 1-2 mpg, even if both are the same brand and model. |
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175 isnt that bad at all, i meant something like 185-205. i should have specified newer civic wheels:)
you will be ok with the 175s and they will get a lot better as they age, not to mention they are safer. keep new tires properly inflated though so they wear even. dont inflate them rediculously so the center wears faster than the edges. |
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I believe my RPM translation of those speeds are as follows: shift into 2nd gear at 1800 rpm shift into 3rd at 1600 rpm shift into 4th at 1500rpm shift into 5th at 1500rpm what RPM are you at at 60mph? |
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