Misfire problems.

"Slant6" (slant-6) 01/16/2016 at 20:37 • Filed to: None

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So I drive the $1200 ranger out to school and it breaks. Misfire started yesterday when I went to Asheville. Changed plugs and still shaking and throwing codes. Also got some obscure body/ chassis codes when I drove on dirt roads for about 50 miles today. They went away though. Pics from my trip today. Any ideas? Wires? Misfire happens on uphills mostly.

BaconSandwich is tasty. > Slant6 01/16/2016 at 20:42

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Misfire makes me think something electrical. Wires, distributor/coil packs. Something like that.

gmctavish needs more space > Slant6 01/16/2016 at 20:56

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Maybe a loose ground? Otherwise what BaconSandwich said

red_ > Slant6 01/16/2016 at 21:00

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Could the ignition wiring harness rubbing against something? Maybe when climbing something can move enough to cause it to short? Would explain some of the body codes

V8Demon - Prefers Autos for drag racing. Fite me! > Slant6 01/16/2016 at 21:03

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The Ford coil packs are probably the weakest link in their drivelines in the past 15 years or so. Most of the time it’s not the pack itself, but rather the spring inside the boot going to the plug. You can usually get them for about 8 bux a pop.

DoYouEvenShift > Slant6 01/16/2016 at 21:06

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It does sound ignition related. What codes? Engine?

Manwich - now Keto-Friendly > Slant6 01/16/2016 at 21:41

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What year is your Ranger and what engine?

Denver Is Stuck In The 90s > Slant6 01/16/2016 at 21:49

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Message me on Facebook. I'll help you out

His Stigness > Slant6 01/16/2016 at 21:50

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I want to start this comment out by saying I’m not mad at you, but this is a general frustration:

Cars don’t throw codes! I wish people would stop saying that. The computer stores codes, it doesn’t throw them.

Manwich - now Keto-Friendly > Slant6 01/16/2016 at 21:51

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Slant6 > His Stigness 01/16/2016 at 22:16

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I know they’re stored but it would regularly blink while driving. I get the same way about wheels vs rims.

Slant6 > Manwich - now Keto-Friendly 01/16/2016 at 22:17

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Oh dammit I’m that guy.

Dash-doorhandle-6 cyl none the richer > Slant6 01/16/2016 at 22:33

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Spent lots of money trying to cure some personality/random multiple missfire codes in my old crv (long may you run), It all came down to one ground that looked ok but was rotten inside the cable. Check all your grounds first. That ranger is going to have 6 or 8 plugs, if that voltage doesn’t have a clear path to chassis ground it will find the path of least resistance, through all your wiring, causing mayhem in your ecm on the way out. Might not be the issue but is the cheapest/first thing to do. Hope this helps, took me 9 months.

Frenchlicker > Slant6 01/16/2016 at 22:39

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For the price of a coil pack go ahead and change that, I've had two old Ford(cars however) and have had to change it on both.

His Stigness > Slant6 01/16/2016 at 23:02

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Well when it’s blinking that means it’s a catalyst damaging miss fire, and you should stop driving.

And I agree about wheels vs rims.

Slant6 > His Stigness 01/16/2016 at 23:15

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Well. I guess it’s too late now. It’s been going all day.

Manwich - now Keto-Friendly > Slant6 01/17/2016 at 00:59

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You might be that guy, but you still need to tell me the year and which engine.

Slant6 > Manwich - now Keto-Friendly 01/17/2016 at 01:33

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Sorry. I really am, have a friend over. 2002 Ranger with the 3.0. I ordered a ignition coil and plug wires for pickup tomorrow morning. Buying tools for the job will be the hard part. Don’t keep any at the dorm.

His Stigness > Slant6 01/17/2016 at 02:55

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Welp, that’s not good.

Pull the plugs from the misfiring cylinders and see if they smell like fuel. If they do you know the injectors are working. If they are, and your engine has a coil pack with wires, replace the wires. If that doesn’t fix it then I suspect the coil pack. If it’s coil over plug then replace the coils as they can go bad quite often. I think in the case of the coils Denso is OEM. In the case of the plugs and wires it’s Motorcraft.

But, make sure you have the right spark plugs in it. Anything aftermarket is suspect and should be replaced with OEM. The same goes for the wires and coil pack. Always use OEM, never aftermarket.

But also, depending on if it’s high mileage it may be a mechanical issue, ie low compression. If it’s one cylinder than I would suspect worn rings (if it wasn’t ignition related). If it’s two companion cylinders than it would probably be valvetrain related.

bryan40oop > Slant6 01/17/2016 at 10:44

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Coil pack. You can have a bad coil and no code. A ford dealer can monitor the coils under load and pinpoint it.

brianbrannon > Slant6 01/17/2016 at 16:38

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Mist the engine with a spray bottle while it’s running and look for sparks on the plug wires and coils

Manwich - now Keto-Friendly > Slant6 01/17/2016 at 20:37

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If it’s not the coil, plug or wire, then it could be an issue with the fuel injector.