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Discussion Starter #1
I've been having problems with a persistent misfire at low rpm/light throttle for over a year now. Ive replaced plugs/wires/coil packs, cleaned MAF, changed EGR valve etc. Latest attempt was to change the leads to genuine Ford items as described here:

http://forums.tccoa.com/showthread.php?t=106805

Although I have now pretty much stopped the arcing on the leads, the car still misfires. Anyone got any ideas?
 

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When was the last time the injectors were cleaned/replaced? If they get dirty and stop atomizing the fuel properly you can have the symptoms you describe.

Just my .02. :thumbsup:
 

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Discussion Starter #3
I've never touched the injectors, so its well over 2yrs ago, if at all. I got the car at 46k miles, and its now at 78k. Been misfiring since about 60k miles.

Is cleaning the injectors somethig I can do myself, or is it a specialist job? I did try adding some injector cleaner in the fuel a year or so ago. No difference.
 

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60K miles shouldn't have that problem, but if the car has been sitting a lot the injectors can build up some varnish and give that problem.

I would run some Seafoam (if you can get it) through the intake and run a can through the gas tank. And of course check for vacuum leaks. There is a fitting on the back of the intake that is notorious for leaking and giving all kinds of irritating problems. It probably wouldn't hurt to change the fuel filter also...

Aren't intermittant misses a pain to troubleshoot!!! :bawling:

Good luck!! :thumbsup:
 

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Discussion Starter #5
The car is used everyday and has been for the last 2.5yrs, so I don't think anything should be gummed up through lack of use and I don't think we have seafoam over here in anycase.

I've checked the vacum pipes I can see and replaced any that look old/cracked. The one behind the intake you mention - is it that hard black plastic one right up close to the firewall where its difficult to get to? How does it fix in place, is it push on, or screwed?
 

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Hmmmmm. Daily driving should keep them clean.

The one behind the intake is a real PITA to get to. I couldn't find a photo and it's been so long since I worked on my SOHC that I can't even remember if it is on the driver or passenger side.

I'm just throwing out things....
Check all your grounds/electrical connections as these cars have a pretty hefty current load and if there are ground issues you can get some weird symptoms.

As a last resort, the only other thing I can think of would be to do a leak down test and confirm you don't have a mechanical problem of some kind. Highly doubtful that you would, but you never know.

That blows that you can't get Seafoam on the island!! It is GREAT stuff!! It sounds like you've covered most of the bases. Hopefully someone else will chime in with some more ideas. :thumbsup:
 

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Discussion Starter #7
I'll check the earths. I don't think its anything mechanical as the car pulls so well when you nail it, and the symptoms have been constant for the last 18 months or so. In fact nothing I've done has changed the way the misfire happens at all. Always at the same engine speeds etc etc. If it were mechanical I would expect the situation to deteriorate.

What exactly does the seafoam do? I saw a video on here of someone who had "seafoamed" their bird, and it blew tons of smoke out the exhausts. I assume its a fuel system cleaner? We have a product over here called Redex, that I think does the same sort of thing. You can put it in the fuel, and also pour it in the air intake. I had a friend once did a "full" redex treatment just because he thought it would do the engine good. Anyway it cleaned so much crap out of the engine that it exposed a crack in his head, which meant he had to do a top end rebuild! That kinda put me off doing stuff like that!
 

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From what I can find on the net, it sounds like Seafoam and Redex are basically the exact same thing.

I run a can of Seafoam through all my fuel injected engines every 50K miles. And each time the car runs smoother. I let half the can get sucked in the intake and pour the rest in the fuel tank. Then after that tank of gas is gone, I do it again. But I have never put it in the crankcase... I just don't like adding things to the oil. :beek:

I think you'll be pleased with it. Read up here on how people do it. I usually let it slowly suck half the can out and then let the engine stall (you'll have to clear a CE light if you do it this way) and then let it sit for a while. Start it up and watch the billowing cloud of smoke. Lots of smoke means it's cleaning the intake system and valves. No smoke means the intake really wasn't that dirty. (I fixed a sticking IMRC on my LSC with Seafoam)

I know Seafoam has a very good reputation and has been around for decades. My grandfather turned me onto it back in the late 70's, (he had been using it since the 50's) but only recently has it become readily available. :D
 

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Discussion Starter #9
I thought that might have been the case. I'll have to give it a go.

When you say you let it "suck" half the can out, how does that work? I think the Redex just comes in a bottle that you'd have to somehow pour into the intake.
 

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pull off the vacuum tube under your brake booster. slowly pour it into the tube, may want to get a funnel. Feather the throttle so that it doesnt stall, if it does, start it right up. Let it sit for about 7-10 min then start it up, and cropdust the neighborhood. Run it on the highway so its up to speed, it will run rough for the first couple of minutes. I drove my car for about 30 min/15 miles after I did it and it cleaned everything out. I poured the other half of the can in my gas. Hopefully that does it for ya.

If not Id check for intake leaks, if your EGR is clogged, IAC valve clogged, that T-fitting that they were talking about, umm thats all I can think of at the moment, lol
 

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I'm having the same problems as you, but without arcing. Low speeds I get a constant missfire, I checked all the vacuum lines and nothing...
 
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