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Stumbling on acceleration

With 185K miles on it, my 2001 Escape has recently started stumbling when accelerating. No problems when idling or decelerating. I have installed new double-platinum plugs gapped at 0.050 and a new spark wire set, but the problem has not gone away. When accelerating in gear, I can sense that one or more cylinders are not delivering power until the engine gets up to around 2,000 RPM, at which point the engine reaches normal power with all cylinders firing. No DTC trouble codes. The 2.0L ZETEC engine fires 2 cylinders at the same time, one on its power stroke while the other is on its exhaust stroke. The spark-gap resistance on the power stroke is higher than on the exhaust stroke, thus delivering a higher spark voltage to the power stroke. But if there is back-pressure on the exhaust cylinder due to acceleration, I suspect that the spark voltage delivered to the power stroke might not be high enough, causing it to "miss". This might explain why all cylinders start firing when the engine reaches a steady RPM or decelerates, causing the back-pressure in the exhaust air-flow to come down. Any feedback on this train of thought? Am I missing something? Do I need a new cat converter?

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  • Cars & Trucks Master
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You may be cruising down the wrong road with the exhaust idea but then you might be right. An exhaust restriction should also cause the engine to run hot. A faulty cat should also set some codes.
If the injectors are dirty, you may have a very lean fuel mix on one or more cylinders under acceleration, which would go away once you are not under load. And injector problems won't set any codes unless an injector stops working completely. Low fuel pressure could cause the same type of issue.

Posted on Dec 04, 2012

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Posted on Jan 02, 2017

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  • 2 Answers

SOURCE: missing, loss of power, etc.

sounds from afar like a problem i had after installing after market spark plug cables on a diff. car. make sure you have factory-quality/ even mits. brand cables. (right parts vs. after mkt.?- no contest.)

Posted on May 06, 2009

jmeyer847
  • 185 Answers

SOURCE: engine Back fired, blew out muffler.

Sounds like you may have gotten some debris in your exhaust pipe or something was clogging your muffler. Maybe the innerds of you Catalytic Coverter went and got stuck or the innerds of your muffler gave out. That would be the only few things I could think of to cause something like that.

Sincerely,

JC

Posted on Nov 16, 2008

  • 154 Answers

SOURCE: 2000 ford focus mis-firing only when i accelerate / decelerate.

Does it still turn on the "Check Engine" lite. Did your mechanic recommend the tune up to "fix" the check engine lite issue or vibration issue? You may want to go back to that shop and ask them why the repairs they recommended didn't fix it? However if the ignition is good, and the compression is good, that pretty much leaves fuel system as the issue. You may have an injector not working properly. Try some good injector cleaner first. Try the Chevron brand w/Techron. It is more expensive but the solvents in that mixture really work well. Don't overlook fuel pressure, but that shouldn't pick on one cylinder. A new fuel filter would be a good idea anyway.

Posted on Apr 03, 2009

  • 2309 Answers

SOURCE: engine idles rough and misses at low rpm. power

get the egr valve checked, place to start

Posted on Apr 13, 2010

seanpwright
  • 2030 Answers

SOURCE: engine code miss fire cylinder #1, spark plugs and

your correct the coil pack is probably the culprit

Posted on Aug 08, 2010

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