Have miss but No check engine light
#1
10-24-2012, 04:09 PM
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Have miss but No check engine light
Need some input on miss firing on acceleration on a 2001 Ford SuperCrew F-150 Lariat, 5.4 engine. 200,290 miles.
Have replaced all spark plug boots covers (Sept 2012), number 1 plug (Sept 2012), 3 and 7 plugs replaced, 3 and 7 has heli-coil kits (2011) installed for blown out plugs. New in-take manifold (2010). New gas line filter, air and oil filters (Oct 2012) and oil changes every 3000 to 3500 miles. Have poured 12 oz. fuel injector cleaner in gas take two times with 6 to 7 gallons of fuel in gas tank (last 2 weeks).
Have No check engine light on for service engine but have had an diagnostic scanner analyzer plugged into driver side, in cab outlet, 4 different times to see if I have a bad coil on plug or other problems. No codes show up indicating any problems. The engine idles nicely when at stop lights but does have a slight intermittent miss at times when warmed up and stopped at lights. Engine misses when warmed up on acceleration (when it is under a load and on acceleration).
Had a mechanic tell me he could plug an analyzer into engine for $80.00 but couldn't guarantee he would find anything wrong. This sounded like a little snow in July to me and the mechanic didn't sound optimistic.
Are there other alternatives that I can try or do myself to pin point the problem. I've gotten older and have lost a lot of feeling in my fingers and can’t do the heavy mechanics I did as a younger man but I’ll tackle anything and my son would help me even though he isn't a mechanic.
Any suggestions will be appreciated,
Thank you
DerbyTracr@aol.com
Have replaced all spark plug boots covers (Sept 2012), number 1 plug (Sept 2012), 3 and 7 plugs replaced, 3 and 7 has heli-coil kits (2011) installed for blown out plugs. New in-take manifold (2010). New gas line filter, air and oil filters (Oct 2012) and oil changes every 3000 to 3500 miles. Have poured 12 oz. fuel injector cleaner in gas take two times with 6 to 7 gallons of fuel in gas tank (last 2 weeks).
Have No check engine light on for service engine but have had an diagnostic scanner analyzer plugged into driver side, in cab outlet, 4 different times to see if I have a bad coil on plug or other problems. No codes show up indicating any problems. The engine idles nicely when at stop lights but does have a slight intermittent miss at times when warmed up and stopped at lights. Engine misses when warmed up on acceleration (when it is under a load and on acceleration).
Had a mechanic tell me he could plug an analyzer into engine for $80.00 but couldn't guarantee he would find anything wrong. This sounded like a little snow in July to me and the mechanic didn't sound optimistic.
Are there other alternatives that I can try or do myself to pin point the problem. I've gotten older and have lost a lot of feeling in my fingers and can’t do the heavy mechanics I did as a younger man but I’ll tackle anything and my son would help me even though he isn't a mechanic.
Any suggestions will be appreciated,
Thank you
DerbyTracr@aol.com
#2
10-24-2012, 06:13 PM
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Have you tried to use the scanner while the truck is warm and running to help the scanner find the miss fire ?
Take one plug out at a time to see if any look bad or burnt. Sometimes the computer does not pick up a "light skip"
And I would never pay someone to guess at what's wrong with my ride. Just sayin
Take one plug out at a time to see if any look bad or burnt. Sometimes the computer does not pick up a "light skip"
And I would never pay someone to guess at what's wrong with my ride. Just sayin
#3
10-24-2012, 06:36 PM
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10-25-2012, 08:12 AM
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