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Hesitation (or Stumble) on acceleration

(1995 Ford Aspire)
in Portland, OR on February 18, 2009
After engine wash w/water: Hesitation / Stumble on acceleration, MIL code is 18
Displaying 1 answers & 1 comments
Popular Answer
on February 18, 2009
Looking at Trouble code chart for your vehicle does not display trouble code 18. It shows trouble code 17. Next trouble after 17 is 25. Please have a qualified mechanic perform a diagnostic of your Onboard Computer System and give you proper trouble code.
on February 18, 2009
To Answerer No. 1: Yes, my vehicle DOES display trouble code 18: I checked with Alldata and Mitchell Automotive software (other person has this software). This is what the table of trouble codes states:
The table lists various codes, including the codes 17 and 25,
then it clearly states, in BOLD CAPITAL letters:
"CODES NOT LISTED - PGC, See: Powertrain Management/ Computers and Control Systems/Testing and Inspection.../Pinpoint tests/PGC - Power and Ground Connections"
So, it directs me to go through tests of Computer's power and ground connectors, and possibly inputs on computer from various sensors. I could go through all that, but I figured that experienced mechanic (not a dude from the street like the one who said "there is no code 18") would narrow down the tests for me based on his/her experience with these symptoms.
Moreover, various online sites (just Google "ford trouble codes") give description of code 18 and three reasons for it.
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