Basically I've been chasing a misfire on cylinder 4 for quite awhile. Last year I bought 4 new coils when 45 or so of them popped up on ebay for $25/ea. After installing them in the rear bank the car seemed to run better for a little while then it popped the same code.
Everybody was of the opinion that it HAD to be a coil...so I bought 2 more from RockAuto about a month ago.
Fast forward to last weekend - I replaced the coils on cylinders 3 & 4 as Ford's diagnostic machine picked up the misfire on 4 as well as an intermittent on 3 that hadn't shown on the hand scanner at AZ. I also put in Autolite XP Iridium plugs all the way around. The wiring harness/loom didn't have any spots burned through that I could see.
The car ran code-free until today, when it did the flashing SES light showing an active misfire for about 30sec, after which I'm assuming the pcm shut the injector off. It only seems to do this (blinking SES light) after being parked at an angle in the parking lot while I'm at work. (the lot has a couple of degree downward slope) It also doesn't do it every single time. Sometimes a day or two in a row, sometimes not for weeks. It isn't using coolant so I doubt it's a headgasket leaking into the cylinder. The ford tech said fuel pressure was fine when they had it hooked up to the machine awhile back but I'm assuming they can only check pressure at the rail, not individual injectors. I'm beginning to wonder if I have the fabled 'chrome flaked off the fuel rail" syndrome. If a little piece of chrome is getting pushed around in the injector filter/screen/whatever wouldn't that cause an intermittent problem?
I bought a remanufactured injector from RockAuto and unless anybody else has any better ideas I'll pull the fuel rail and replace the injector on #4 this weekend. The injector I received is gray, though, not yellow, and the whole bottom half is metal instead of plastic like the ones pictured on the website. The part # matches what RockAuto has listed on their website, GB REMANUFACTURING Part # 82211147.
Here's what it looks like:
Will this work or did they send me the wrong thing?
Any and all help diagnosing this would be appreciated. If swapping the injector doesn't work I'm going to have to spend my tax refund taking this somewhere to have it worked on, and with what Ford charges, it isn't going to be them... Too bad NESHO isn't doing any roadtrips to the Omaha, NE regional area.
Scott
Everybody was of the opinion that it HAD to be a coil...so I bought 2 more from RockAuto about a month ago.
Fast forward to last weekend - I replaced the coils on cylinders 3 & 4 as Ford's diagnostic machine picked up the misfire on 4 as well as an intermittent on 3 that hadn't shown on the hand scanner at AZ. I also put in Autolite XP Iridium plugs all the way around. The wiring harness/loom didn't have any spots burned through that I could see.
The car ran code-free until today, when it did the flashing SES light showing an active misfire for about 30sec, after which I'm assuming the pcm shut the injector off. It only seems to do this (blinking SES light) after being parked at an angle in the parking lot while I'm at work. (the lot has a couple of degree downward slope) It also doesn't do it every single time. Sometimes a day or two in a row, sometimes not for weeks. It isn't using coolant so I doubt it's a headgasket leaking into the cylinder. The ford tech said fuel pressure was fine when they had it hooked up to the machine awhile back but I'm assuming they can only check pressure at the rail, not individual injectors. I'm beginning to wonder if I have the fabled 'chrome flaked off the fuel rail" syndrome. If a little piece of chrome is getting pushed around in the injector filter/screen/whatever wouldn't that cause an intermittent problem?
I bought a remanufactured injector from RockAuto and unless anybody else has any better ideas I'll pull the fuel rail and replace the injector on #4 this weekend. The injector I received is gray, though, not yellow, and the whole bottom half is metal instead of plastic like the ones pictured on the website. The part # matches what RockAuto has listed on their website, GB REMANUFACTURING Part # 82211147.
Here's what it looks like:
Will this work or did they send me the wrong thing?
Any and all help diagnosing this would be appreciated. If swapping the injector doesn't work I'm going to have to spend my tax refund taking this somewhere to have it worked on, and with what Ford charges, it isn't going to be them... Too bad NESHO isn't doing any roadtrips to the Omaha, NE regional area.
Scott
