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Is your Escort rough idling? When at a stoplight, does it go Vroom-Vroom-Vroom-Vroom? Do you watch the Tach jumping up and down and go, "WTF is going on?"

It could be your EGR Vacuum Regulator Solonoid.

My car had these symptoms and I spent a whole bunch of money trying to fix it. I even took it to a shop and they told me the wrong thing (firestone blows). Here's what I replaced before I figured it out:

EGR Valve
Tranny Fluid
Idle Air Control Valve
PCV
Fuel Filter
Changed Gas Brands
Many Gallons of Fuel Injector Cleaner

I even thought it might be the MAF at one point, and I wasn't looking forward to spending that $300. But, I took the time to learn a bit about EGR. I even bought the Haynes Manual and read everything I could. I checked my hoses for leaks, nothing. I checked the Vacuum check valve, also nothing. Then I noticed the little black canister it was connected to. What the hell was that?

I couldn't even find pictures of what the EGR Vacuum Regulator (EVR) Solenoid was supposed to look like, so I assumed that was it. I ponied up the $30 or so from Autozone and got a replacement.

It took about 30 minutes to replace the damn thing because the rail it's connected to is notoriously hard to get to. Basically the instructions are as follows:

1. Unscrew the old one
2. Disconnect the hoses and electric
3. Connect the hoses and electric to the new one
4. Screw in the new one

The 'scort worked perfectly after that. Out of idle (no pun intended) curiosity, I tested the old one with a multimiter (like it says to do in the Haynes Manual) and it tested out fine. There were no codes, no check engine light, nothing. In short, the only way to know it was broken was to replace it. But, for $30, it was well worth it.

Moral of the story: if you have a rough idle, check the EVR. For $30, you could save yourself a ton of time and money.

Anyone want me to post pics of where to find the thing?
 

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lol the giant white arrow... right on. And why would you ever put a club on an escort?! Dude... if somebody stole my escort, I can't say I'd be mad. I'd be more curious than anything. Who the hell would steal an escort?!?

The purpose of the EGR, for those of you who don't know, is to recirculate a portion of the exhaust gas back into the intake plenum so it can be re-burned. This reduces NOX emissions and helps lower cylinder temps at lower rpms. Usually, the EGR solenoid closes on most cars at WOT.

However, it plays a big part at low rpms. The reason why your idle was so screwed up was probably just due to the fact that it was gunked up. EGR solenoids always get the hell gunked up out of themselves, and they often make a mess of intake plenums too, leaving nasty caked on carbon deposits and sh*t.

Over at the mitsubishi 3000GT forums, a guy even makes EGR blockoff plates so your engine can't recirculate the exhaust gas. Some people claim it improves performance, which is arguable, but after 100K miles, it definetly reduces the amount of gunk in the intake plenum and runners.

Mind you that a "hunting" idle is not always caused by the EGR. I've seen it cause by everything from the TPS to the CAS to the fuel pump. Finding the cause of a hunting idle is like finding a needle in a haystack. It's not easy.
 

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An Escort with a club, that's like a Geo with a trailer hitch :p I would be happy if someone stole my scort, then I wouldn't have to repair the body on it 8O

Dear god was my intake manny filled with crap when I cleaned it. I still have the uncleaned original off the car. Caked with crap. Thank god for injector cleaner because my valves were spotless :wink:

Good job :D

Matt 8)
 
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