[updated:LAST EDITED ON 27-Nov-02 AT 10:41 AM (EST)]the check engine light has come on and it idles real rough it also gets poor gas milage too

it is a 99 explorer with 4.0 sohc engine

 

Not too familiar with the 4.0, but I had a 5.0 in a clubwagon van and it had a bad habit of the egr valve sticking open which will cause the rough idle. They carbon up and stick open. Should be closed at idle if I remember correctly.

 

Have you had your lower intake manifold o-rings replaced under warranty through Owner Notification Program 00M12? That is one of the symptoms.

 

i didn't get any notice about the o rings but i also did also suspect that it was the egr valve

 

The notices for ONP 00M12 were mailed out in November & December of 2000. If you aren't the original owner or have moved since you purchased your Explorer, they might have missed you. You are still elegible to get them fixed under warranty if you have less than 72K miles on your Explorer whether you got the letter or not.

 

i also checked the fordwebsite entered my vin number and there were only 2 the power train calabration update and the turn signal/wiper update

 

It's possible the previous owner already had the updates installed (if you didn't buy it new). On rare occasions, I have seen the updated parts fail. I've seen it maybe twice in the last two years.

 

That recall is for the Cam chain Tensioner. The Tensioner is loose and it will cause a vibrating sensational noise that you can perfectly hear. May want to check that number again 00M12???

 

What check engine codes apply to the o ring leak?

 

P0171 & P0174

 

Quite often you wont get any codes ....you have to watch the short term fuel trims while spraying down the intake to find a leak.

 

Whether or not you get any codes is determined by how bad the leak is and how long it has been present. When I diagnosed mine (by spraying propane on the lower intake manifold per Ford's TSB) mine had set the two codes (P0174 & P0174). I had noticed a fluctuating idle for a couple weeks leading up to the CEL coming on. Unfortunately (maybe fortunately ) here in Phoenix, it doesn't get too cold so mine wasn't as affected as one might be back east. Once the leak gets bad enough for the PCM to detect the unmetered air, it will set the codes.

 

 

>I have94explore same problem except engine light didnt come on had same problem with 94 cougar injector stuck open. If it is injector easy way to find is to take out each sparkplug one at a time see if it is wet. First start the rig about 20 seconds then check. Let us know what you fine.



















the check engine light has come on and it idles real rough
>it also gets poor gas milage too
>
>it is a 99 explorer with 4.0 sohc engine

 

thanks but i fixed it it was mainly the intake manifold gasket that was recalled so i took it in for that and i cleaned the injectors new fuel filter, plugs and reset the computer and that fixed it