1994 Mercury Villager Won't accelerate past 2500 RPM

Tiny
JOBBY99
  • MEMBER
  • 1994 MERCURY VILLAGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Engine has slight misfire, which gets louder as your go faster, but not abnormally loud. Fuel injectors are suspect, but it was accelerating fine before fuel injector cleaning with intermittent CEL. After cleaning, accelerated a bit better as well. Now, I have permanent CEL. I can't pull codes, b/c I don't have the right pinout for use with test leads on my neighbors professional scan tool.

Car won't accelerate past 2500 rpm even when floored. Runs rough as well during initial idling on startup. Idle set very high to prevent problems with stalling on startup (eventually levels out around 900 RPM in a minute). I replaced oxygen sensor with universal type. Throttle body cleaned and EGR Valve cleaned a week ago. Replaced throttle position sensor as well.

A few months ago:

Rough idle problem causing stalling on cold mornings.

**** Mechanic performed
MOTORVAC FUEL INJECTOR TREATMENT and VACUUM TESTING


No vacuum leaks found.
No codes found.
No other problems mentioned besides fuel injectors probably b/c they read the common problems with this car and didn't know what else to blame.

*********************************

Tested fuel injectors on front that are reachable and found similar response (SLIGHT DROP IN RPM) when pulling power to each; one at a time. Assuming if fuel injector problem, it would have to be one or more of the inaccessible fuel injectors towards cowl under Plenum.
Thursday, May 28th, 2009 AT 7:07 PM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Try loosening the exhaust before the cat converters to see if you have a partially plugged exhaust system. In the future use the correct o2 sensor for your vehicle, they are designed a little different from car to car, I have had very little luck with universal ones. Aso you wil need to get it scanned for codes, there are simply too many things it could be to just guess
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Friday, May 29th, 2009 AT 8:01 AM

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