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Old 04-13-2011, 10:08 AM   #1
O2BDrty
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Fuel injector problem?

For some time now my engine has had a slight hesitation to it or shudder from time to time but not all the time. It does have new plugs and wires. Today it backfired. Was just wondering if maybe the fuel injectors were getting clogged. If thats the case what is the best fuel injector cleaner out there.
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Old 04-13-2011, 10:35 AM   #2
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I use seafoam. once a month, and I also use lucas gas treatment almost every tank. I'm just anal like that. some times my 2010, will sputter and almost die if I go a long time with out running a fuel additive, kinda odd but it works. The lucas gas treatment goes in every tank, and you can get it at walmart. I would run some seafoam through your break line booster as well, if you look on here there are threads on the break line booster procedure.
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Old 04-13-2011, 10:38 AM   #3
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What is seafoam? Besides what you find at the beach!!!!!!!!
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Old 04-13-2011, 10:41 AM   #4
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funny, its at walmart, its a fuel cleaner, and it works great.its like 8-9$ for a can.
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Old 04-13-2011, 10:43 AM   #5
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If others get on here they will say the same,
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Old 04-13-2011, 10:46 AM   #6
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I use SeaFoam monthly. Never tried the Lucas fuel additive, but I do use the Lucas oil additive every oil change.

Never tried the brake booster method. It's on my list to do once I get my own driveway to work in


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Old 04-13-2011, 10:47 AM   #7
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EXCELLENT!!!!!!!!!!!!!!!!! Thanks everyone. I'll try it today.
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Old 04-13-2011, 10:49 AM   #8
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What is seafoam? Besides what you find at the beach!!!!!!!!
http://www.jkowners.com/forum/showth...hlight=seafoam

It has directions as a fuel additive and as intake/top end cleaner.
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Old 04-13-2011, 02:52 PM   #9
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Well I did the seafoam thing as suggested and no big plume of black smoke. Is there an actual fuel injector cleaner I can get that you run thru the injectors like jiffy lube does? Or because I did the steps above thru the vacuum line for the brake booster I don't need to do that. What I had left over I put into the gas tank. Suggestions or comments please.
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Old 04-14-2011, 03:54 AM   #10
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If you didn't get any smoke with the sea foam, id say your engine is pretty clean then. Maybe check that your throttle valve isn't sticking? I've seen them get gummed up on the backside of them on other cars and stick every once in awhile. However, if you've gotten to the point that it backfires, that almost sounds like a timing issue. Cam position sensor maybe? I've also heard of some guys having problems with the timing chains stretching prematurely on these engines.
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Old 04-14-2011, 04:04 AM   #11
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Have you replaced the PCV valve? Mine is doing the same thing as yours again, 53k miles on it. About every 3 months I'll run about 2 tanks full of super unleaded, but I do need to get better about running injector cleaner through it. It also made a signifigant differrence when i changed the PCV valve though so I guess i'll pick another one up, it also seems to make a bit of difference when I take the air cleaner out and knock some of the stuff out of it but I need to replace it as well, it's been about 25k since I've replaced it. I'll probably read more about the Sea Foam stuff as well, that will get some "hen pecking" from the wife.... what the heck is wrong with it now??? Dunno, maybe it wanted 37"s instead of 315's, and is protesting... Or maybe it is wishing for a hemi...
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Old 04-14-2011, 04:25 AM   #12
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Get some throttle body cleaner and clean the butterfly. Mine was actually crusty after 60k miles.
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Old 04-14-2011, 05:50 AM   #13
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If you used the seafoam only through the vacuum source it really wouldn't do anything but rush by the injectors. You'd want it in the tank to go through it.

I'd look more into a crankshaft sensor or maybe camshaft sensor...backfiring, I'd start with ignition timing. Which is read by probably the camshaft sensor.

There is always the basic fuel filter change too if you are leaning towards fuel, I don't think I've EVER seen a fuel filter thread on this forum lol
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Old 04-14-2011, 11:18 AM   #14
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What would make the engine shudder from time to time?
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Old 04-14-2011, 11:43 AM   #15
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There is always the basic fuel filter change too if you are leaning towards fuel, I don't think I've EVER seen a fuel filter thread on this forum lol
Isn't the JK's fuel filter inside the gas tank though? That's why I always thought that there wasn't a thread on that.
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Old 04-14-2011, 12:30 PM   #16
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^^^? I think you are right, but you could add one inline some where. That way you could get to it and change it out if need be.
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Old 04-15-2011, 10:47 AM   #17
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What would make the engine shudder from time to time?
does it seem to only happen when you first really hit the gas after starting it up? mine does it too. I had a '96 grand cherokee that did the same thing. after much data logging, i found that one of the oxygen sensors was taking to long to warm up (it was showing an extremely rich or lean condition). if the sensor wasn't warmed up before the computer transitioned from open to closed loop, it would hesitate and stumble real bad since the computer was trying to compensate for and extreme a/f ratio that didn't exist. the wrangler isn't that bad....yet, but i'm not yet sure if that is what's going on with it.
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Old 04-15-2011, 11:55 AM   #18
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does it seem to only happen when you first really hit the gas after starting it up? mine does it too. I had a '96 grand cherokee that did the same thing. after much data logging, i found that one of the oxygen sensors was taking to long to warm up (it was showing an extremely rich or lean condition). if the sensor wasn't warmed up before the computer transitioned from open to closed loop, it would hesitate and stumble real bad since the computer was trying to compensate for and extreme a/f ratio that didn't exist. the wrangler isn't that bad....yet, but i'm not yet sure if that is what's going on with it.
Its not throwing that code out. I'm thinking a bad spark plug or wire. Would it do it all the time with a bad plug? Its only a once in awhile thing
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Old 04-15-2011, 12:40 PM   #19
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Its not throwing that code out. I'm thinking a bad spark plug or wire. Would it do it all the time with a bad plug? Its only a once in awhile thing
A bad or fouled plug will throw a code.

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Old 04-15-2011, 12:46 PM   #20
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Its not throwing that code out. I'm thinking a bad spark plug or wire. Would it do it all the time with a bad plug? Its only a once in awhile thing
the GC never threw a code. if it was a bad plug, i'd expect it to happen pretty frequently.
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Old 04-15-2011, 12:58 PM   #21
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A bad or fouled plug will throw a code.

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Old 04-15-2011, 12:59 PM   #22
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the GC never threw a code. if it was a bad plug, i'd expect it to happen pretty frequently.
Doesn't happen all the time. I'll figure it out soon. I hope
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Old 04-15-2011, 03:24 PM   #23
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Isn't the JK's fuel filter inside the gas tank though? That's why I always thought that there wasn't a thread on that.
Yes it is, however it still is very possible that it will cause issues. Just because it's "extended service" life, or whatever they want to call it, doesn't mean it never needs replacement. To me. It's a filter, it will require replacement at some point.

For kicks I'd drive around with a fuel pressure gauge and verify it's there when it hiccups. And try a fuel volume test if the spec can be found. An intermittent problem of floaties in the tank only causing problems with it gets near the pump wouldn't be the first one I've seen.
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