#1 Cylinder misfire AND lean fuel
#1
#1 Cylinder misfire AND lean fuel
I hope I could get a little guidance / advice from any seasoned '05 -'09 GT owners.
I've got a completely stock '05 GT Convertible, manual trans. 2 days ago - ran rough at idle after starting, then seemed to miss, acceleration was "hesitating", and the exhaust note was irregular. CEL came on - AutoZone read the codes as:
P0301 - Cylinder misfire detected - cylinder #1
and
P0171 - Fuel trim bank one condition
No mods to the engine. 39,800 miles. Last oil change, fuel filter change about 200 miles ago. Ford dealer today - NO HELP. Let my car sit all day, I picked it up and brought it home.
I've worked on cars in the past, but nothing so heavily computerized.
From what I guess, I could have a problem with ignition (spark plug - originals have never been changed, coil), possibly an injector, maybe oxygen sensor?
If anyone has been able to stay awake through this - can you tell me which cylider is #1, and what the pattern is; which is bank one (left or right, I guess), and if you've had similar experiences, and how you've solved them. Any thoughts are appreciated
I've got a completely stock '05 GT Convertible, manual trans. 2 days ago - ran rough at idle after starting, then seemed to miss, acceleration was "hesitating", and the exhaust note was irregular. CEL came on - AutoZone read the codes as:
P0301 - Cylinder misfire detected - cylinder #1
and
P0171 - Fuel trim bank one condition
No mods to the engine. 39,800 miles. Last oil change, fuel filter change about 200 miles ago. Ford dealer today - NO HELP. Let my car sit all day, I picked it up and brought it home.
I've worked on cars in the past, but nothing so heavily computerized.
From what I guess, I could have a problem with ignition (spark plug - originals have never been changed, coil), possibly an injector, maybe oxygen sensor?
If anyone has been able to stay awake through this - can you tell me which cylider is #1, and what the pattern is; which is bank one (left or right, I guess), and if you've had similar experiences, and how you've solved them. Any thoughts are appreciated
#2
Here is Ford's list of possible problems for that error code:
http://iihs.net/fsm/?dir=10&viewfile...scriptions.pdf
You will have to scroll down till you hit 030X.
I can't seem to find the cylinder layout online though. Hopefully someone else can chime in on which cylinder is number 1.
http://iihs.net/fsm/?dir=10&viewfile...scriptions.pdf
You will have to scroll down till you hit 030X.
I can't seem to find the cylinder layout online though. Hopefully someone else can chime in on which cylinder is number 1.
#5
First no brainer things would be to pull the plug and check it. Check the wire to the coil and then visibly inspect the coil. If your plug looks okay then switch coils with another cylinder. If that doesn't change anything, I would recheck all of the vacuum lines to make sure there is not a hole or crack in them.
Do not put any fuel additives in thinking you may solve the issue.
You can also unhook the battery and let it sit overnight. Then try all over agina. Sometimes these issues have gone away.
other than that you are looking at something else probably in the emission system such as the front O2 sensors.
Do not put any fuel additives in thinking you may solve the issue.
You can also unhook the battery and let it sit overnight. Then try all over agina. Sometimes these issues have gone away.
other than that you are looking at something else probably in the emission system such as the front O2 sensors.
#6
Again, Thanks for all the info. I disconnected the battery, preparing to begin to take stuff apart, when I noticed the lip of the rubber tube that connects the Air filter box to the intake had been folded over when the big hose clamp had been applied. NOTE: I haven't touched this myself yet! So I hadn't done this. There was just a tiny crack visible between the rubber and the intake - right in front of cylinder #1. I took it all apart, cleaned the parts, and re-connected it corretly. A short test drive later, no CEL, and my car runs better than it ever has. Now I'm wondering if it was like that when I bought it? Hopefully this solves my problem for now.
#7
Again, Thanks for all the info. I disconnected the battery, preparing to begin to take stuff apart, when I noticed the lip of the rubber tube that connects the Air filter box to the intake had been folded over when the big hose clamp had been applied. NOTE: I haven't touched this myself yet! So I hadn't done this. There was just a tiny crack visible between the rubber and the intake - right in front of cylinder #1. I took it all apart, cleaned the parts, and re-connected it corretly. A short test drive later, no CEL, and my car runs better than it ever has. Now I'm wondering if it was like that when I bought it? Hopefully this solves my problem for now.
So is the PCV line? This the line goes from your crank case to your air inlet tube.
Or another? Take pic and post it becasue someone else will search this thread later and probably solve their issue.
Good job on fixing it.
#8
I had a smiliar problem on my F150. I broke the hard plastic hose that goes from the drivers side valve cover to the PCV valve on the intake. I replaced it with a standard rubber hose. Bad idea. As the engine heated up- the hose would collapse under vacuum. I would get a lean misfire- and spark/ ignition codes - and the truck would hesitate briefly while running down the road.
I don't know if this is similar to your problem- but I put the OEM part tube on - and the problem stopped.
FWIW
Good luck>
I don't know if this is similar to your problem- but I put the OEM part tube on - and the problem stopped.
FWIW
Good luck>
#9
I think he was saying he had an air leak between the MAF and throttle body.
Thread
Thread Starter
Forum
Replies
Last Post