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Hi, I have had this problem for a while but it seems to be getting worse lately. If I am driving around and come to a complete stop(or stick it in neutral) the engine will go right down to 500rpm and bounce up to 1000, and back down. The last few days it has even stalled on me too. Anyone know what the problem may be? (1991 Escort GT 5spd) Hmm just occured to me, could it be a leak off the Vacuum hose that comes off the silencer right after the VAF?


Also, my car blow some oil, and I am getting bad mileage(~20mpg), could a fouled O2 sensor cause the bad mileage, where is it located?
 

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on any ford, this goes more often, its the Idle Speed Sensor, i know on mine (89 LX) it went and the same problem has happend to me, it stopped after the sensor was changed, if ur check engine light comes on just check that out, and the mileage can change if you do a complete tuneup, cap, rotor, plugs, wires, fuel, air, breather filters. that will help ur mileage a little, thats my insight on ur problem
 

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HuD_91gt said:
Hmm just occured to me, could it be a leak off the Vacuum hose that comes off the silencer right after the VAF?

Also, my car blow some oil, and I am getting bad mileage(~20mpg), could a fouled O2 sensor cause the bad mileage, where is it located?
You're pretty much right on it. also check the pipe just below the exhaust manifold. that had a leak the same time my intake had a leak. caused stuttering and shaking. also check and make sure your ignition module is functioning alright. check your plug holes for oil and your plugs for carbon or oil deposits. O2s can cause bad mileage. I'm at about 19-21 mpg (this is above normal actually) I know i need to change my PCV and prolly my O2 sensor. good luck.
 

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Discussion Starter · #4 ·
Well I do have a fair sized exuast leak right below the exuast manifold, but you can't really see it becuase it is behind somesort of heat shield on the elbow, im afraid if i remove it it will just disinigrate.
 

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You might try a spray throttle body cleaner also. with my 91 egt when it was almost stalling coming to a stop, this fixed it for a good six months at a time. It might help some.
 

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Yeah, that sounds a lot like the typical junk throttle postion senson. the mustangs were horrible for this. Give that a look as well.
 

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Discussion Starter · #8 ·
SHughes said:
You might try a spray throttle body cleaner also. with my 91 egt when it was almost stalling coming to a stop, this fixed it for a good six months at a time. It might help some.
I tried this, and yes it worked wonders, it now stays at 1000rpm at idle.
 

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If that helped I'd give 20:1 iin Vegas that it is your Idle Air Control Valve (IAC). It is that little cylindical jobber on your Throtle Body that has a plug with two wires going to it. Those thing get gunked up and cause the problem you were explaining. If it occurs again I would sugest taking it off (only two screws) and spraying the hell out of it with some T/B Cleaner to get all the gunk out of it.
 

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heres the deal. i stopped at my friends house tonight and i had the clutch completely to the floor and it stalled. so i put it in nutral and started it back up and for about 20 seconds the RPM's were between 500-1000. when i bought the car last year, my gas milage was around 19. now, its around 12 MPG. i read the posts but i am new with cars and dont really understand some of the stuff. (IAC)? Idle Speed Sensor? O2 Sensor? I would greatly appreciate it if ya could tell me which one or all might be wrong and how much it would cost to get fixed. This gas is so darn expensive now.... thanks guys.
 

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dude if your getting that little bit of mpg than you need to get your scort checked out, i have a zetec and i get 30-40 mpg. my 1.9 got 30-35. and about the stalling , if its an lx you should always check your vacume hose on top of your intake manifold, that hooks up to your pvxc valve, this elbo always colapses on all lx's, if it hasnt than it will. ford has updated the desighn, there alot better.
 

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finially checked out my engine.... dirty air filter and NO vac leaks. i think i have bad plugs too. so im going to change the plugs and air filter but i dont think those are hurting me 10 MPG.
 

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Check your EGR valve too. It could be dirty and not sealing very well. My 88.5 LX was doing the same thing but when I had my Ignition Control Module replaced they removed and cleaned my EGR valve and the idles real smooth now. It's doesn't "idle dump*" when I come to a stop now.


*A new way of describing it in my books. :headbang:
 
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