1998 Ford Escort rev and idle issues

Tiny
WV JOSH
  • MEMBER
  • 1998 FORD ESCORT
  • 2.0L
  • 4 CYL
  • FWD
  • MANUAL
  • 227,000 MILES
I have a 1998 escort zx2 it has less than 30k miles on a factory rebuilt engine and has been well maintained its entire life. Sometimes it idles down extremely slowly from 3k to 2k rmp and when it gets under 2k it dies completely and the only way to get it to idle decent is to mash the gas all the way to the floor and let off. Plus sometimes on cruising speeds above 55mph it will not idle down at all when you push the clutch in it stays at that rmp even if you completely stop. Also when accelerating in any gear it has what can be best described as repetitive hesitations, like instant loss or gain of significant power but is not in any way misfiring. Sort of feels like the ac is cycling on and off very fast but its not. Most of the time it does the same thing when decelerating in all gears. I have checked for vacuum leaks and replaced the pcv valve, maf, iac, acts, tps, speed sensor and bcm, plus a complete tune up and fuel pressure is within specs. I am not getting any codes and timing is dead on. I am stumped. Please help
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Saturday, June 28th, 2014 AT 9:12 AM

10 Replies

Tiny
HMAC300
  • EXPERT
Try cleaning the throttle plate on both sides with choke cleaner and iac hole.
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Saturday, June 28th, 2014 AT 12:02 PM
Tiny
WV JOSH
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I apologize for leaving out that I did that. Ive fought with it for over a month and have done so much that when I posted this I forgot to mention it.
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Saturday, June 28th, 2014 AT 5:35 PM
Tiny
HMAC300
  • EXPERT
Have it scanned for codes and check vacuum at idle if 15" or below suspect a clogged converter/exhaust. This may be a clutch problem. Also belt and tensioners shold be replaced every 60k so it may be that but just making the problem bigger. Otherwise with out look ing at it I'm stumped as well.
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Sunday, June 29th, 2014 AT 7:58 AM
Tiny
WV JOSH
  • MEMBER
Just a thought I started wondering if maybe the computer may have a dead side on the timing or the speed side and not be reading the info on the sensors correctly. Could that be a possibility?
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Sunday, June 29th, 2014 AT 3:33 PM
Tiny
WV JOSH
  • MEMBER
The drive belts and idler and tensioner are new but I havent checked the vacuum pressure. But there are no codes that are present. I will check the vacuum and get back with you. Will be tomorrow evening before I can do it though.
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Sunday, June 29th, 2014 AT 3:36 PM
Tiny
HMAC300
  • EXPERT
Normally codes are set that can't be fixed that lead to another ecmif you have on eof those K&N type air fliters on your car to much oil is added to the cotton and gets sucked in so clean your maf and your throttle plate and iac hole with choke cleaner. Also make sure the duct work going form maf has no holes or cracks in it as well as all grommets on engine if any of those are like that it cause s an air leak and the computer is trying to add fuel to make up for it.
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Sunday, June 29th, 2014 AT 3:42 PM
Tiny
WV JOSH
  • MEMBER
Ok couple more things to add. Checked vacuum today 21 in. Cold 20 at running temp idling. So im good there. No k&n filter so thats not a problem. And everything you mentioned had been cleaned last week. Did notice 1 odd thing that may be the culprit where the converter mounts to the exhaust manifold there is an ever so slight exhaust leak. I mean like a hole in the flange gasket the size of a pencil lead. Just above the upstream o2 sensor. Found with a home made smoke machine in the exhaust. Would that cause extreme issues or just an annoying one?
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Monday, June 30th, 2014 AT 7:13 PM
Tiny
HMAC300
  • EXPERT
The ex leak could set off a code 420/30 but other than that annoying I have no further comments without seeing this car.
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Tuesday, July 1st, 2014 AT 6:05 AM
Tiny
WV JOSH
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Ok thank you for your time and advice. Sorry to bother you
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Tuesday, July 1st, 2014 AT 7:45 AM
Tiny
HMAC300
  • EXPERT
It's not a bother, just some things have to be physically looked at and checked which we cannot do via computer.
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Tuesday, July 1st, 2014 AT 7:47 AM

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