Fuel injection with different pulse widths - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 5 Old 08-15-2017, 09:36 AM Thread Starter
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Fuel injection with different pulse widths

On cylinders 1,3,5 it's at 3200 to 3700 on cylinders 2,4,6 it's up to 4000 to 4200. Is this enough to cause p0300 multi misfire? When i hit the gas while in gear my jk falls flat on its face.
Thanks for any help.
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post #2 of 5 Old 08-15-2017, 06:17 PM
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My best guess is that the modified PW is a symptom of the misfire, not a cause.

Others might be able to chime in, but when looking for misfires, I think... plugs/coils/carbon deposits/fuel quality/knock sensor... etc...

_
'76 CJ-7, '43 CJ-2a, '78 Bronco,'78 CJ-7, '75 CJ-5, '78 CJ-7, '80 CJ-7, '78 SJ, '79 SJ, '78 and a '76 FJ-40 , '90 XJ, '91 XJ, '86 CJ-7, '95 ZJ, '68 CJ-101 Commando, '00 TJ, '68 M-715, 2 '86 Military Blazers, '96 LR Discovery, '86 CJ-7, '91 YJ, '99 TJ, 07' JKU Rubi, 1988 YJ, 1973 Commando, 3 Diesel Excursions....
Now back to a 2013 JKU Rubicon with "stuff", planning 37's with minimal lift.

I've tried them all... Jeeps are still the best. (0||||0)
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post #3 of 5 Old 08-16-2017, 05:35 AM
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hear any popping ( electric-like) or crackles underchood or , in complete darkness visual blue arcing under hood around plug wires?
Most replaced item - before I started running heat shielding ,plug boots (& stopped using an antiquated , wire eating set of cheap plug boot pliers that also cut tiny holes in the grey boots ) -on my '11 unlimited was the spark plug wiring . Yours being a multi makes me suspect the wiring and the ignition pack itself .
Plugs can get wider and wider gapping from heat and age, too.
Like mentioned , cleaning top end helps but this sounds like the coilpack may have gotten heat damaged? Just throwing options out for ya


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post #4 of 5 Old 08-16-2017, 05:55 AM
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Have you left it parked for any extended times? I spent about 6 months away working, then a couple more. I filled ip about 2 times in 2 years. I killed my battery and started getting massive powerloss and misfires. Had the tank drained and all was good again.

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Originally Posted by thedirtman View Post
Running 37's as a daily driver is dumb
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post #5 of 5 Old 08-26-2017, 08:56 PM
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also if you have recently fueled up make sure you didnt get bad fuel and have a water in the fuel issue.
if you fuel while the tanker is depositing fuel or right after you can get a lot of crap in the system.
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