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Old 09-10-2014, 12:59 PM   #1
Mercury264 OP
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Jeep Wrangler Injector Question

Jeep Wrangler is throwing a code (0203) which points to a bad #3 injector.

Couple questions:

1. Is there a way to test the injector so I can rule it in/out as the problem - i.e. possible wiring issue ?

2. If it is the injector, should I replace them as a set or can I just do a single one - it seems pretty easy so it's not like it's a PIA so do them all at the same time type deal (they are 50 bucks each at Autozone so is quite a difference to do 1 or all 6). Or, best I can tell

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Old 09-10-2014, 02:58 PM   #2
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Swap that injector with the one next to it, reset CEL, see if the code follows the injector. If it does, there you are. If not, maybe bad wiring.

You can replace just one at a time.
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Old 09-10-2014, 04:36 PM   #3
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Originally Posted by ruin View Post
Swap that injector with the one next to it, reset CEL, see if the code follows the injector. If it does, there you are. If not, maybe bad wiring.

You can replace just one at a time.
NOW you're thinkin with your dipstick!
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Old 09-11-2014, 10:19 AM   #4
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Quote:
Originally Posted by ruin View Post
Swap that injector with the one next to it, reset CEL, see if the code follows the injector. If it does, there you are. If not, maybe bad wiring.

You can replace just one at a time.
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NOW you're thinkin with your dipstick!
Great idea....thanks.
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Old 09-12-2014, 06:41 AM   #5
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Based on what I've seen from AutoZone and the like, I'd pop for an OEM injector.

When you swap the injector, swap the plug to a different cylinder just to rule that out. Long as you're there.


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Old 09-12-2014, 06:54 AM   #6
ruin
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Definitely a good idea, if he can. Most vehicles I've worked on don't have enough wiring available to do that without cutting up the loom or coaxing the plugs out of the harness, so it didn't even occur to me.
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Old 09-12-2014, 11:47 AM   #7
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Definitely a good idea, if he can. Most vehicles I've worked on don't have enough wiring available to do that without cutting up the loom or coaxing the plugs out of the harness, so it didn't even occur to me.
u swap the injector itself, no need for longer harness wires. pull the rail, swap the injectors, re-install rail, test, wait for leaking gas to evaporate....., install new injector & o-rings.

edit:

and if it's a 4.0, dont forget to swap the o-rings out in the FPR on the end of the rail while you're in there.
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vintagespeed screwed with this post 09-12-2014 at 11:48 AM Reason: blah
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Old 09-12-2014, 11:53 AM   #8
ruin
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u swap the injector itself, no need for longer harness wires. pull the rail, swap the injectors, re-install rail, test, wait for leaking gas to evaporate....., install new injector & o-rings.
That was what I suggested. Another poster suggested he also swap the wiring to another cylinder, which is a good idea if he can, but might not be able to.

If you are getting a code on injector #2. Swap the injector with #1. and swap the wires between.. erm.. I think it would be 2 & 5 (you want the opposing cylinder, the one at TDC on exhaust stroke when cyl 2 is at TDC on compression stroke). Afterwards the code location could really narrow things down.

1: injector problem
2: cylinder problem
5: wiring problem
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