Intermittent Check Engine Lite - 93 Ford Escort LX

Reply

  #1  
Old 11-15-04, 02:10 PM
Member
Thread Starter
Join Date: Aug 2004
Location: Orange County, NY
Posts: 103
Question Intermittent Check Engine Lite - 93 Ford Escort LX

My wife's car: 93 Ford Escort Escort LX 1900cc SOHC
Problem1: Check Engine Light will go on and off while driving. It is never on at startup. It only comes on when car is driven, but may still be on or not when car is stopped and engine is still running.
Problem2: In warm or hot weather, when engine is thoroughly warmed up, at highway speeds, usually after 1/2 hour or more of highway driving, at 55mph or above, going uphill and sometimes on a level road.the engine will lose power and buck and will recover if I back off of the throttle. I am unable to duplicate this problem until a warm day in spring. This can happen if the check engine light is on or off. The fuel pressure remains within specs at all times. The fuel and air filters have been replaced. I have also replaced the Oxygen Sensor, and the engine temperature sensor and the spark plugs.

I recently purchased a digital OBD1 code reader.
KOEO code is 111; Continuous memory codes = 171, 181, and 186;
KOER code is 111; Cyllinder test = 90.

What is the next step?
 
Sponsored Links
  #2  
Old 11-15-04, 03:51 PM
Member
Join Date: Aug 2003
Location: Cape Cod
Posts: 4,320
I think your Mass Air Sensor is gunked up
You'll need to remove the sensor from the MAF unit
It uses a special no-tamper torx bit
You might want to slice some slots into the screw heads and turn them into flat head screws
Unhook the negative battery terminal
It's in between the air filter and the intake plenum on the black air inlet hose
Look for a squarish black box with those weird screws

After removing the screws, pull the top piece off
There should be a sensor with some wires
They may be covered in black gook
Clean it carefully with an oxygen sensor safe carb cleaner (you can un-hook the wire harness and take it safely away from the car)
Put it back, tighten it up, and hook up the battery
 
  #3  
Old 11-15-04, 03:57 PM
Member
Join Date: Aug 2003
Location: Cape Cod
Posts: 4,320
PS codes
171 Fuel system at adaptive limits, HEGO (O2 sens.) unable to switch
181 Fuel system at rich adaptive limit at part throttle, system lean
186 Injecter pulse width larger than expected

The computer thinks it's running lean an is flooding the engine at part throttle (highway)
 
  #4  
Old 11-15-04, 08:01 PM
Member
Thread Starter
Join Date: Aug 2004
Location: Orange County, NY
Posts: 103
Hi Stickshift,

Thanks for the diagnosis. I was thinking I might need to do something with the MAF and cleaning it is a lot cheaper than replacing it. I will be passing an autoparts store tomorrow and will pick up some Oxygen safe carb cleaner.
This car has about 60K miles and my 96 LX Wagon has 108K and gets better gas mileage. This could be the reason.

In addition to performance, another reason to fix this thing is that Orange County, NY, has begun testing emissions and the 93 is due in Dec.
 
  #5  
Old 11-17-04, 09:04 PM
Member
Thread Starter
Join Date: Aug 2004
Location: Orange County, NY
Posts: 103
Thumbs down

OK, sprayed MAF, OAT and Throttle Body with Throttle Body & Fuel System Cleaner. Check Engine Lite still comes on.

I will try unloading the whole can on the MAF.
 
  #6  
Old 11-18-04, 05:16 AM
Member
Join Date: Aug 2003
Location: Cape Cod
Posts: 4,320
You'd see the gunk on the MAF sensor if that was it
When you pull it out it looks like a teeny tiny delicate light bulb filament
Or it's supposed to
If it's black and thick it's gunked
Did you unhook the battery to reset the computer?
 
  #7  
Old 11-19-04, 07:05 PM
Member
Thread Starter
Join Date: Aug 2004
Location: Orange County, NY
Posts: 103
Hi Stickshift,

I didn't see any gunk on the MAF wires, but I sprayed them anyway.

Today, I reset the codes with the code reader. Then I ran a KOEO and memory scan to make sure the reset worked. The codes were gone.
I did a test drive and the lite came on in about 1/10 mile. I did another scan, koeo = 111, memory = 181, 186 (171 is gone, but the test was only about 2 miles). I didn't do a KOER test, I'll do that tomorrow.
 
  #8  
Old 11-23-04, 08:30 PM
Member
Thread Starter
Join Date: Aug 2004
Location: Orange County, NY
Posts: 103
Hi Stickshift,

The 171 memory code appears to be gone since I cleaned the MAF.
I did a full scan after a couple of hrs driving and I still get 181 and 186 stored,
no KOEO or KOER codes. Check engine light is intermittent, but is on more than off.

The check engine light is never on when I do the KOER scan. It is on for the KOEO, but that is due to the ignition key circuitry that tests all the warning lights.

If I make an extention cable for the code reader, would it be useful to leave it connected and on while driving? Is there any special setup for this?
 
  #9  
Old 11-23-04, 08:38 PM
Member
Thread Starter
Join Date: Aug 2004
Location: Orange County, NY
Posts: 103
Hi Slickshift,

Sorry about the stickshift thing. Do you get that a lot or am I the only lousy reader?
 
  #10  
Old 11-25-04, 03:45 PM
Member
Join Date: Aug 2003
Location: Cape Cod
Posts: 4,320
Originally Posted by CybersaurusREXX
Hi Slickshift,

Sorry about the stickshift thing. Do you get that a lot or am I the only lousy reader?
Haha...not as much as you'd think, me trying to be funny with the words and all
No need to apologize, but thanks

I think I should apologize, I was sure it was the MAF sensor
If your scanner supports DCL or "real-time data" while driving then yes, go for it
I know your vehicle's computer does
I'd have someone else drive or read the info, you don't want to do both!
If your scanner can save the info for later retrieval, that could be helpful

Be on the lookout for leaks, vaccum or other, specificly un-metered air getting into the engine (air that doesn't go through the MAF, like a crack in the air inlet tube after the meter)
 
  #11  
Old 12-18-04, 12:26 PM
Member
Thread Starter
Join Date: Aug 2004
Location: Orange County, NY
Posts: 103
Question

What is the probability that the problem is the egr valve?
 
  #12  
Old 12-18-04, 01:09 PM
Member
Join Date: Aug 2003
Location: Cape Cod
Posts: 4,320
Not to good...
You don''t have one
lol
Sorry to hear you're still bucking
Can you check the fuel pressure on that?
Maybe even check it driving around a bit
Also check again for leaks, breaks, splits in hoses, especially at the bends
Check the PCV valve hose
Here's a list of some Technical Service Bullitns for this vehicle
http://alldata.com/TSB/19/93191544.html
Maybe something will sound familier and you'll want to ask a Ford place to print out a TSB or two
 
  #13  
Old 12-19-04, 09:03 PM
Member
Thread Starter
Join Date: Aug 2004
Location: Orange County, NY
Posts: 103
Yeah, I couldn't find an EGR on the 93. It's in plain sight on the 96. Strange that the 93 doesn't have one, I thought all cars had them since the 80's.

The 93 isn't bucking right now and probably won't until spring or summer.
It's the [email protected]#% Check Engine light and the 181 and 186 codes. You know, I didn't check the PCV. That should be easy. I could clean it and if that doesn't fix it I'll swap it with the 96. If the 96 complains, I'll replace both. Just what I need in this below freezing weather and wind.
 
  #14  
Old 12-20-04, 05:00 AM
hogfan's Avatar
Member
Join Date: Oct 2003
Posts: 352
Vacuum Leak?

1)Look at the PCV valve hose coming out of the intake manifold. The rubber hose sucks in an usually has a hole in it. 2)Spray the intake manifold at the cylinder head with WD40 or Choke cleaner and see if the RPM's rise. Could be an Intake manifold gasket.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes