stlunatics2oo3 Posted October 7, 2003 Report Posted October 7, 2003 what would make my cars speed be 7 mph. more then what it says and please help me figure out how to fix it thanks Jeremy Quote
PJB Posted October 7, 2003 Report Posted October 7, 2003 Could be caused by the wrong size tires if theyre too small the speedo will be off in a positive way. Quote
MaroonRegal Posted October 7, 2003 Report Posted October 7, 2003 An speedometer that is not working properly, that's what. What'd you do, get a ticket? Only thing I can think of is my Dad's truck. Whoever owned it before put huge-ass wheels/tires on it, and this made it so the speedo was improperly calibrated. On some cars, the mechanic can just recalibrate it, while on others, recalibrating causes the car to act is if you've replaced the odo/speedo. (Which is not necessarily a bad thing, becase if you've been going 7 miles faster than you thought for very long, there are a significant amout of miles that the odometer doesn't know about.) I highly doubt it's wheel size in your case, because his was anywhere from 5 - 10 mph off, and the tires were probably 2" larger than stock. It could still be a miscalibration for some other reason, but I'd look into other possibilities. Quote
stlunatics2oo3 Posted October 7, 2003 Author Report Posted October 7, 2003 nope stock size rims and tires it just started doin it i put a performance chip from ffp in it and it is thrown off iunno if it is caused by it but it is messed up Quote
MaroonRegal Posted October 7, 2003 Report Posted October 7, 2003 Oh, that has to be it. I don't know a lot about ECMs, but I know they basically run everything. Tell them it's wrong, they might make you a new one. Why a performance chip? Did you do some other mods too? Quote
Thabulldog Posted October 7, 2003 Report Posted October 7, 2003 My speedo says im 10mph more then reality all the time, doesnt this mean im racking up miles im not even driving? I'm thinking the rebuilt tranny a few years back might of messed up the VSS? Quote
stlunatics2oo3 Posted October 7, 2003 Author Report Posted October 7, 2003 well i am still confused about the speedo bein off never was until i got the chip can the chip make this happen ???? Quote
MaroonRegal Posted October 7, 2003 Report Posted October 7, 2003 My speedo says im 10mph more then reality all the time, doesnt this mean im racking up miles im not even driving? I'm thinking the rebuilt tranny a few years back might of messed up the VSS? I would say so, bro. That's how my dad's truck is. Of course, sometimes the speedo shuts off, and so does the odometer, so his is probably pretty balanced, lol Don't you think that's how it would work? One sensor, am I right? Shawn? Erik? Someone either confirm my thinking or shoot it down, these people need to know. Quote
Thabulldog Posted October 7, 2003 Report Posted October 7, 2003 im just guessing here but maybe since the chip can reset the speed limiter, maybe it messed up something in the computer in the process? Quote
Robby1870 Posted October 7, 2003 Report Posted October 7, 2003 My speedo says im 10mph more then reality all the time, doesnt this mean im racking up miles im not even driving? I'm thinking the rebuilt tranny a few years back might of messed up the VSS? I would say so, bro. That's how my dad's truck is. Of course, sometimes the speedo shuts off, and so does the odometer, so his is probably pretty balanced, lol Don't you think that's how it would work? One sensor, am I right? Shawn? Erik? Someone either confirm my thinking or shoot it down, these people need to know. I dont think the odometer uses what the speedo says to calculate miles. I think the odometer is run from the tranny, and based on how fast things in the tranny are turning Quote
Thabulldog Posted October 7, 2003 Report Posted October 7, 2003 Doesn't the VSS go off of the transmission and that feeds into the speedometer which the odometer calculates how far the car is going by taking the speed of the car and comparing it with the time, maybe im just nuts and making up my own theory tho... :? Quote
PaPaPooh Posted October 7, 2003 Report Posted October 7, 2003 put the old chip back in and see it is right on if so its the chip if not it is something else Quote
stlunatics2oo3 Posted October 7, 2003 Author Report Posted October 7, 2003 okay i will try that all i kno is i have 7 days to get it fixed or i get a ticket so i hope it is the chip and not the vss i figure it is to expensive thanks Jeremy Quote
phantomshado Posted October 7, 2003 Report Posted October 7, 2003 call me crazy, but I think the VSS is on the rear brakes. I was doing work on my ABS a while back, and the VSS came up in my GM repair manual. Quote
Thabulldog Posted October 7, 2003 Report Posted October 7, 2003 then how come when the front wheels are spinning the speedo still registers a speed if the rear wheels arent even moving? Quote
sonyman87 Posted October 7, 2003 Report Posted October 7, 2003 the speedo reads a voltage.. so messing with the computer probably got the alt- to charge the battery to a higher voltage causeing a missread in the speedo. not sure if its directly related but thats where i would start Quote
Justin Posted October 7, 2003 Report Posted October 7, 2003 The VSS is in your trans tailshaft. The ABS sensors are on the wheels, if you have ABS. Your speedo is reading slow because of your chip, that is your delayed speed limiter. Gay, isn't it. My chip did the same thing. Technically you can go faster than 117 now, but since your speedo is screwed up, what's the use? You won't know how fast you're going anyways. Quote
Robby1870 Posted October 7, 2003 Report Posted October 7, 2003 call me crazy, but I think the VSS is on the rear brakes. I was doing work on my ABS a while back, and the VSS came up in my GM repair manual. VSS is on the passenger front half shaft Quote
stlunatics2oo3 Posted October 7, 2003 Author Report Posted October 7, 2003 i don't have abs so that isn;t it Quote
MaroonRegal Posted October 7, 2003 Report Posted October 7, 2003 well i am still confused about the speedo bein off never was until i got the chip can the chip make this happen ???? I definitely think the chip can make this happen. Quote
stlunatics2oo3 Posted October 7, 2003 Author Report Posted October 7, 2003 i have put the old chip in and the speedo is correct so i went to the cops shop and had them check it and no more fix it ticket so the chip was bad thanks for all your input guys yall are the best Quote
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