check engine light comes on when i coast

[stonny9]

if i do about 50+ mph then let off the gas and coast for a few seconds my check engine light comes on. The dealer said that i had a bad egr valve when they checked the code so i replaced it my self but it still comes on everytime i coast . i have a 93 3.4 with 133000 miles. the o2 sensors havent been changed for at least 30,000 miles. what could be the problem

[InZane4all]

I have this exact same problem. Changed EGR valvae, light still comes on. Let me know if you fix it so that I can fix mine as well. It's really annoying.

[StudlyCamaro]

yeah , mine did it for 4 years ... wanna know how to solve it... pull the buld out, lol, well thats how i fixed it anyway

i was tired of taking chicks out and having them freak out and tell me to pull over (like any of the stuck up borads knew more than i do about my car :rolleyes: ) , and i never paid attention to it.. so even if it came on when i was driving for another reason i wouldnt have paid attention to it, and if there was something wrong i would know without having a light.. and i scan my car regularly anyway i still throw the codes for the egr solenoids malfunctioning.. but no light

[GreenDragon]

my light comes on when iam coasting down hill in 2 gear but in a couple of seconds it shuts off.

[GuyWithRacingStripes]

PLEASE! someone figgure out what the heck is causing this! mine does it too!

[mAsKeD_mUlLeT]

same thing was happening to me. I got the code read and it was the EGR valve, i put a new one on and my light keeps coming on like InZane4all's does, i also restarted the PCM but that didn't work either. so its most likley the EGR valve. [img]graemlins/burnout.gif[/img]

[viper98885]

That used to happen to me too. It is almost definitely an EGR thing, but I am not 100% sure why it does it. I think that it is because of the whole backpressure thing and the fact that is you are coasting in gear and you let off of the gas, there is no load on the engine (as far as acceleration), but the engine is still turning at a high RPM than idle.

I think that mine went away for good when I put my headers on.

[InZane4all]

LOL, I guess this is an excuse to finally get myself some spanking new headers then? [img]graemlins/naughty.gif[/img] Well, I thought about removing the bulb or whatever it is that triggers that SES light to come on, but you never know when it will come on when there's something actually going wrong with the car. Get's annoying and used to freak my GF out whenever it would come up whenever I would be driving in the freeway. :eek:

[MustangEater8251]

Yeah I have heard other with this as well... thing is I heard changine the EGR is waht fixed it or cleaning it...


not sure but I never had it on my car...

[camaro_dakota]

I had the same thing and i changed the egr and it still happened. I sent my computer to ed wright and had him erase the code i think its code #3 and i havent seen the light since.

[StudlyCamaro]

<blockquote>quote:</font><hr>Originally posted by MustangEater8251:
Yeah I have heard other with this as well... thing is I heard changine the EGR is waht fixed it or cleaning it...


not sure but I never had it on my car...<hr></blockquote>
i put a new one on my car and it still did it for 3 years

[ReodDai]

egr sim is your friend