Mike36

Recently the check engine light has been coming on almost every time when im cruising at 3k rpm anywhere between 40mph and 60mph on the freeway. It then goes away when I turn the car off. Any ideas before I go get it checked out???

98vtec

when the CEL comes on, is there a noticeable loss in power? loss in response?

Mike36

Never occurred to think about that but the answer is no. Any ideas?

98vtec

i was thinking knock sensor, because way back when i used to use one, this problem happened. As long as I stayed below 3k, no CEL. The second i went about 3k, i would get a Knock sensor CEL.

Mike36

Does the knock sensor affect how my car runs and why would it go bad???

98vtec

yes, when you get a knock sensor cel the ecu retards the timing and makes the car a pain to drive.

m3dia_lab

i have a similar problem... mine only happens when the temp gauges hits 1/2 way almost as soon as the gauge hits 1/2 on the temp the cel comes on... no power lose or anything... strange problem

98vtec

get the code.

ninja 6

To the op: I think you should invest in a OBD-2 scanner if your car is 1996+

JasonST

Sounds like possibly EGR. Only comes on during cruising from 2700-3500 rpms in my experience and when car was warmed up. Get the code though to know for sure.

shutta

yeah, I keep getting a code 7 for throttle position sensor and it usually only comes on when i'm getting on it at about 50-60 in 3rd. sometimes it doesn't effect me but sometimes it makes my car go nuts and jerk randomly.

chekc the code and then someone can help you

Mike36

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JasonST &raquo;</TD></TR><TR><TD CLASS="quote">Sounds like possibly EGR. Only comes on during cruising from 2700-3500 rpms in my experience and when car was warmed up. Get the code though to know for sure.</TD></TR></TABLE>

That sound about right...if its that what does the EGR do and why does it cause the check engine light to come on???

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ap &raquo;</TD></TR><TR><TD CLASS="quote">To the op: I think you should invest in a OBD-2 scanner if your car is 1996+</TD></TR></TABLE>

Car is a 93 so im OBDI

Can i just go to any mechanic and have them read the code???
The code also disappears when I turn off the car so i guess I have to drive around until it trows a CEL again.

shutta

your ecu will most likely be storing the code. search for hwo to read a CEL on here and it'll take you 2 minutes with a paperclip. not worth paying to have a mechanic read it and charge you

Mike36

Yeah I know the paper clip trick...I was just under the impression that you couldnt check the code once its gone and that you can only do it when you start your car. I guess Ill try it when I get home. thanks

shutta

yeah, just pop it in there and turn the key forward. My 4ws stores codes and even when the 4ws hasn't been on for weeks, and i check a CEL, it shows me stored 4ws codes also