My car has been down for 7 months waiting for parts to put my motor back together. I Just got it running like a month and a half ago. Motor is already broken in. Ive noticed that at night when my lights are on they stay dim and brighten up off and on. Also sometimes when im driving my car it will jerk like im popping the clutch and also when im driving it will sometimes bog down when i give it some gas and it will throw a code. What i usually do is just shut it off and turn it back on quickly and *Poof* the CEL is gone. But today it did it again and i checked the code and it was a Code 3 (Map Sensor).

Could my alternator have anything to do with it or my battery since the map sensor has voltage? If anyone has experienced this or knows of any solutions please let me know. thanks


Modified by Turbo R at 12:05 AM 9/30/2003

 

ttt

 

I have the SAME EXACT PROBLEM! Been running the car like this for like 10months, when it bogs like that I and I get a cel I just shut it off and turn it back on. Still dont know what the hell it is. When at idle the motor vibrates alot (rough idle). SO I would like to know also.

 

Are you guys running a Field's SFC VTEC controller at all ? if so, that could be the reason.

I use to have the same *jerky* problem with my car and it was because of the SFC VTEC controller and how it communicates with the MAP sensor. If there's a loose connection with the wiring of the SFC to the MAP sensor (should be soldered) , you'll get that jerky symptom once in a while. I hated it so much, I yanked the shizzit out and sold it. lol...

 

Im not gettin a map CEL like he is and using a stock p75 obd1 with obd2-1 jumper.

 

I sound like you have two different problems. As far as the dimming lights issues, on most Honda that has the ELD (electrical load detection) will cause that dimming or light flickering. This actually considered normal. But again, I don't know what is actually happening to your lights.


Anyway, are you using any piggy back system that in connected to the map input wire? I have come accross two civics with a v-tec controller and was setting map sensor fualts.

If not check map senor supply voltage is should be about 5volts. Also performed a voltage drop test on the ground side of the map sensor it should be less than .5 of a volt.

With key on engine off check your map sensor voltage input reading it should be close to your referrence voltage.

 

Is .5v a typo? Sounds a lil' to high....perhaps .05v was your intention?

 

No, map sensor on all Hondas have a 5volt referrence to the sensor.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">Is .5v a typo? Sounds a lil' to high....perhaps .05v was your intention?</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HONDADNA &raquo;</TD></TR><TR><TD CLASS="quote">I sound like you have two different problems. As far as the dimming lights issues, on most Honda that has the ELD (electrical load detection) will cause that dimming or light flickering. This actually considered normal. But again, I don't know what is actually happening to your lights.


Anyway, are you using any piggy back system that in connected to the map input wire? I have come accross two civics with a v-tec controller and was setting map sensor fualts.

If not check map senor supply voltage is should be about 5volts. Also performed a voltage drop test on the ground side of the map sensor it should be less than .5 of a volt.

With key on engine off check your map sensor voltage input reading it should be close to your referrence voltage.</TD></TR></TABLE>

Ill check the voltage soon as i get a chance. If it reads under 5volts then what could be the problem?

I dont have any piggy back systems.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HONDADNA &raquo;</TD></TR><TR><TD CLASS="quote">No, map sensor on all Hondas have a 5volt referrence to the sensor.
</TD></TR></TABLE>

Agreed. I was referring to the ground side voltage drop though, sorry for not being specific.

So the Q remains: Isn't .5v a little much for a voltage drop?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">

So the Q remains: Isn't .5v a little much for a voltage drop?</TD></TR></TABLE>

Well the say it is. However found my expericence on the field, a .5 of a voltage drop does not really affect anything. But someone else might argue this. Generally, you want less then .4 of volt and no greater.

But if it's a MAF, hot wire tpye, then .5 of a volt would be too much.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbo R &raquo;</TD></TR><TR><TD CLASS="quote">

Ill check the voltage soon as i get a chance. If it reads under 5volts then what could be the problem?

I dont have any piggy back systems.

</TD></TR></TABLE>

if ref. voltage is not between 4.9 - 5.0, it could be a bad connection(pin fit), corrosion, or a high resistance wire.