my buddies check engine light on his 90 civic si comes on after driving for abouit 2-4 minutes. but only at regular speeds 40-45 mph, not at slower speeds20-35 mph.

any suggestions or thoughts of why it comes on?

 

could be o2 or Map related .

 

Check to see what the code is. how many blinks on the ecu. here is a link of the codes for you
https://honda-tech.com/zerothread?id=468260

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Creepshow STI &raquo;</TD></TR><TR><TD CLASS="quote">my buddies check engine light on his 90 civic si comes on after driving for abouit 2-4 minutes. but only at regular speeds 40-45 mph, not at slower speeds20-35 mph.

any suggestions or thoughts of why it comes on?</TD></TR></TABLE>

i bet o2. once the car is warmed closed loop is activated

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crxben &raquo;</TD></TR><TR><TD CLASS="quote">Check to see what the code is. how many blinks on the ecu. here is a link of the codes for you
https://honda-tech.com/zerothread?id=468260


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

X2

 

no to highjack this tread but my cars cel also lights on but every time i restart it ...its goes away...should i bother pull out my ecu will it still have the information even if i shut the car off??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RockWolf &raquo;</TD></TR><TR><TD CLASS="quote">no to highjack this tread but my cars cel also lights on but every time i restart it ...its goes away...should i bother pull out my ecu will it still have the information even if i shut the car off??</TD></TR></TABLE>

Yeah check it for codes,

 

you dont pull out the ECU to check codes...


pull back the carpet and count how many times the red dot blinks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by STREETWERKZ &raquo;</TD></TR><TR><TD CLASS="quote">you dont pull out the ECU to check codes...


pull back the carpet and count how many times the red dot blinks. </TD></TR></TABLE>

hehehehe

 

is it possible that it blinks more then 30 times.... i get tired to count them or i miss one sometimes because of a distraction...

 

make sure there is not a pause, the ecu will blink more than one code at a time if needed

blink, blink, blink....pause....blink, blink, blink, blink....long-pause....

would be codes 3 & 4 the blink pattern starts over at the long pause