Need help diagnosing engine idle/ revving problem
#1
Need help diagnosing engine idle/ revving problem
Hi, guys I need a little help diagnosing a problem. I would like to have an idea what may be wrong before I take it to a shop. Any help is appreciated.
2005 F150 5.4L 56,000 (+/-)
For about 2 months now whenever I start the engine it revs up to about 1800RPM for maybe 1 to 2 minutes or until it warms up and then settles into a regular idle and runs smooth.
For the past two days the engine has developed an idling problem. The engine develops a loping idle and starts sputtering, almost as if it were about to cutoff. It makes the truck shake. The truck looks and sounds like I have a hot rod designed to run smooth at wot.
Any ideas? Also have not had the plugs changed, yet.
2005 F150 5.4L 56,000 (+/-)
For about 2 months now whenever I start the engine it revs up to about 1800RPM for maybe 1 to 2 minutes or until it warms up and then settles into a regular idle and runs smooth.
For the past two days the engine has developed an idling problem. The engine develops a loping idle and starts sputtering, almost as if it were about to cutoff. It makes the truck shake. The truck looks and sounds like I have a hot rod designed to run smooth at wot.
Any ideas? Also have not had the plugs changed, yet.
#2
#4
#5
Thanks for the responses. I think I was unclear about my intentions. I have absolutely no mechanical aptitude, whatsoever. I plan on taking it to the dealer for repair, but I would like to have an idea as to what may be wrong as I have found most service advisors don't know what they're talking about.
Also, an update. She cutoff on me at an intersection - fired right back up but I now have a check engine warning light on.
EsoxShep - It does not rev when I stop only when cold starting. After coming to a stop it just begins to rough idle.
Also, an update. She cutoff on me at an intersection - fired right back up but I now have a check engine warning light on.
EsoxShep - It does not rev when I stop only when cold starting. After coming to a stop it just begins to rough idle.
#7
Hey guys, thanks for the responses. I figure I would post my findings in case someone else comes across the same symptoms.
My local dealership inspected it and called me back. The diagnosis:
1. Coil pack on cylinder #6 was bad.
2. Bad coil caused or lead to computer code error that caused the engine to run too rich. Leading to....
3. All of the spark plugs are fouled.
So... I will find out today if they were able to change out my plugs successfully ... or not. Luckily extended warranty will cover almost all of the work.
My local dealership inspected it and called me back. The diagnosis:
1. Coil pack on cylinder #6 was bad.
2. Bad coil caused or lead to computer code error that caused the engine to run too rich. Leading to....
3. All of the spark plugs are fouled.
So... I will find out today if they were able to change out my plugs successfully ... or not. Luckily extended warranty will cover almost all of the work.
Trending Topics
#8
Damn!! That would make her run like chit - she was sick that's for sure. It might be a good idea to question a possible injector problem to them, since the plugs where fouled and the 05's had injector problems in the past. The Tech's most likely are aware of that problem if the trucks at the dealership, but it doesn't hurt to ask about it.
Last edited by jbrew; 04-18-2008 at 01:12 PM. Reason: ++ *Injector problem?