MPH Gauge!!!!!!!!!

[jdmem205]

Hey what would the problem be if my mph gauge is reading incorrectly also what kinda test could I do to check if in fact it is messed up????

 

[TaNk00VsM]

iono but mines reads like 5 mph off as well

 

[jdmem205]

Bump anyone have ideas of what can cause this or how to diagnos it?

 

[kbrownmann]

you can find out for sure by going by one of those cop radars and check your speed against what yours says

 

[RonJ]

I have two bone-stock 6th gen Civics and both speedometers read approximately 3 mph faster than actual speed or the speed read by an OBDII scan tool.

 

[jdmem205]

you can find out for sure by going by one of those cop radars and check your speed against what yours says

I tried that but those aren't that accurate since there are other cars in the road assumming you are talking about the ones that on the side of the road???

 

[jdmem205]

I have two bone-stock 6th gen Civics and both speedometers read approximately 3 mph faster than actual speed or the speed read by an OBDII scan tool.

So I can hook up an obdII scan tool to see if its off? Where would I plug the scan tool to get this reading and can you give me a how to? thanks

 

[RonJ]

So I can hook up an obdII scan tool to see if its off? Where would I plug the scan tool to get this reading and can you give me a how to? thanks

Plug the OBDII scan tool into the Data Link Connector located just above the driver's kick panel. But you need a scan tool capable of reading mph from the ECU. The most basic code readers don't necessarily have this capability. I have this scan tool:

 

[jdmem205]

Could I pick one up at like pep boys? Or something like that? Also I have a 98 civic dx hatch bone stock with a y7 and I never seen that connector you are speaking of???

 

[RonJ]

Could I pick one up at like pep boys? Or something like that?

Possibly. You need a scan tool that reads live data. Shop around. Be sure to compare prices at locals sores with those online. For example, the CP9180 is currently $144 at Amazon.

Also I have a 98 civic dx hatch bone stock with a y7 and I never seen that connector you are speaking of???

Put your head under the driver's side dash and look above the kick panel. It should be clearly visible there.

 

[jdmem205]

OK thanks will do... I'll see when I can get my hands on a scan tool so I can do this

 

[Chucklee514]

It seems that most cars, in my experience, say they're going faster than they are by a few miles per hour compared to the computer when hooked up to a scan tool.

 

[jdmem205]

Yea thats what it looks like but I have a strange feeling my car is way more off then 3mph

 

[RonJ]

It seems that most cars, in my experience, say they're going faster than they are by a few miles per hour compared to the computer when hooked up to a scan tool.

Contrary to my two Civics, my 98 Toyota speedometer is dead on with the scan tool and actual speed.

 

[Chucklee514]

Both my wife's Saab and my Civic read 3 mph faster than actual speed. Then my friends comment that their vehicles read faster than their actual speed. That's why I said in my experience.

 

[Mastaciv]

my GPS and MPH gauge are 4 mph off i just average it ;p

 

[RonJ]

my GPS and MPH gauge are 4 mph off i just average it ;p

Oh yeah, I forgot to mention that my scan tool and GPS agree on speed but differ with my Civic speedometer (+3mph). In contrast, all three devices agree in my 98 Toyota.

 

[jdmem205]

Lol I'll have to check mine out I think I'll see if my aunt's gps takes down her mph so I can just borrow it