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Sorry, but I need help again #5168552 07/22/19 11:41 PM
Joined: Sep 2015
Posts: 681
NavyVet88 Offline OP
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2002 Ford Ranger Edge 3.0 67k

Hey guys,

I know I’m beating a dead horse about my truck, but I am about to lose my mind with this. I did a compression test this past Sunday and cylinders 1,2,3,4,5,6 were 165,164,160,160,165,170 respectively. My compression seemed good.

I thought I had fixed the rough idle by replacing the coil pack, but no. Also, tonight on my way home from work at 60-65mph on the interstate I feel what feels like a misfire. It’s not bad enough to be scary, but it’s noticeable. I pulled off my exit to a stop sign and magically there’s no rough idle. Engine was purring. After pulling off, I get to around 50 mph and I feel the “misfire” again. The next 18 miles until I arrived home would produce the “misfire” between 40-50 mph. The symptoms don’t exactly match what I have researched as possible culprits.

Bad/faulty fuel injector(s)- wouldn’t this produce a more constant misfire and rough idle? Fuel economy seems decent for the age of the truck. First full tank of highway miles produced 335ish miles on a 16.5 gallon tank.

O2 sensor(s)- no rotten egg smell that I have read about associated with this and again fuel economy doesn’t seem affected.

Engine has no EGR valve.

No check engine light or codes....

Replaced parts- coil pack, plugs, plug wires, serpentine belt/tensioner/idler pulley(needed changing), cam sensor and synchronizer, and fuel filter.

I’m out of ideas guys.

Last edited by NavyVet88; 07/22/19 11:45 PM.

2013 Honda Civic LX 1.8L 178k M1 HM 0w20 with Fram XG7317
2002 Ford Ranger Edge 3.0L 67k Castrol Edge 5w30 with Fram XG3600
Maintenance Technician by trade, working class for life.
Re: Sorry, but I need help again [Re: NavyVet88] #5168556 07/22/19 11:46 PM
Joined: Dec 2006
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KrisZ Offline
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Did you check for vacuum leaks?


2015 Grand Caravan 3.6L - 31k miles.
2006 Mazda 3 2.0L - 171k miles
Re: Sorry, but I need help again [Re: NavyVet88] #5168560 07/22/19 11:49 PM
Joined: Feb 2014
Posts: 3,333
Marco620 Offline
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Bad gas?


15' Civic 1.8 i-vtec 262,000 mi Redline 5w20, BP Cvt fluid, Archoil9100
Tornado Chaser/Doberman Whisperer
Son of a Navy Corpsman.


Re: Sorry, but I need help again [Re: KrisZ] #5168561 07/22/19 11:50 PM
Joined: Sep 2015
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NavyVet88 Offline OP
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Originally Posted by KrisZ
Did you check for vacuum leaks?


Yes and I did not find any. Doesn’t mean I missed a leak, but I did not find one after multiple checks with carb cleaner.


2013 Honda Civic LX 1.8L 178k M1 HM 0w20 with Fram XG7317
2002 Ford Ranger Edge 3.0L 67k Castrol Edge 5w30 with Fram XG3600
Maintenance Technician by trade, working class for life.
Re: Sorry, but I need help again [Re: Marco620] #5168565 07/22/19 11:54 PM
Joined: Sep 2015
Posts: 681
NavyVet88 Offline OP
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Originally Posted by Marco620
Bad gas?


Considered this. I have filled up multiple times from local “prominent” gas stations and have the exact same issues across 87,89 and 93 octane.


2013 Honda Civic LX 1.8L 178k M1 HM 0w20 with Fram XG7317
2002 Ford Ranger Edge 3.0L 67k Castrol Edge 5w30 with Fram XG3600
Maintenance Technician by trade, working class for life.
Re: Sorry, but I need help again [Re: NavyVet88] #5168566 07/22/19 11:57 PM
Joined: Jun 2019
Posts: 78
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A_Spruce Offline
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Is there a relation of misfire to speed, rpm, or engine load?


'03 Suburban
Re: Sorry, but I need help again [Re: A_Spruce] #5168569 07/23/19 12:04 AM
Joined: Sep 2015
Posts: 681
NavyVet88 Offline OP
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Originally Posted by A_Spruce
Is there a relation of misfire to speed, rpm, or engine load?



Rpms do not jump/bounce or change at all with the “misfire” or the rough idle. Under load going up a hill for example, there is no misfire feeling. Seems most noticeable on level ground at cruising speeds of anywhere from 40-65mph. The rough idle is intermittent between stops seeing as I don’t feel it every time I come to a stop.

Last edited by NavyVet88; 07/23/19 12:06 AM.

2013 Honda Civic LX 1.8L 178k M1 HM 0w20 with Fram XG7317
2002 Ford Ranger Edge 3.0L 67k Castrol Edge 5w30 with Fram XG3600
Maintenance Technician by trade, working class for life.
Re: Sorry, but I need help again [Re: NavyVet88] #5168577 07/23/19 12:12 AM
Joined: Oct 2015
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Dylan1303 Offline
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Hows your ltft? That might tell a story


12 cruze rs 1.4t 6spd pp 5w30 tuned on 22psi
13 equinox 2.4 awd pp 5w30
Re: Sorry, but I need help again [Re: NavyVet88] #5168579 07/23/19 12:13 AM
Joined: Sep 2015
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NavyVet88 Offline OP
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I feel like I am chasing a ghost seeing as I can’t find anything in my troubleshooting, yet have an issue. I am a maintenance technician by trade and my livelihood is based off of precise troubleshooting and fixes on equipment that is running 24/7.


2013 Honda Civic LX 1.8L 178k M1 HM 0w20 with Fram XG7317
2002 Ford Ranger Edge 3.0L 67k Castrol Edge 5w30 with Fram XG3600
Maintenance Technician by trade, working class for life.
Re: Sorry, but I need help again [Re: Dylan1303] #5168580 07/23/19 12:14 AM
Joined: Sep 2015
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NavyVet88 Offline OP
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Originally Posted by Dylan1303
Hows your ltft? That might tell a story


Ltft?


Edit: long term fuel trim. Gotta love google. I have no clue honestly. How would I go about checking this?

Last edited by NavyVet88; 07/23/19 12:16 AM.

2013 Honda Civic LX 1.8L 178k M1 HM 0w20 with Fram XG7317
2002 Ford Ranger Edge 3.0L 67k Castrol Edge 5w30 with Fram XG3600
Maintenance Technician by trade, working class for life.
Re: Sorry, but I need help again [Re: NavyVet88] #5168586 07/23/19 12:34 AM
Joined: Sep 2015
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NavyVet88 Offline OP
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Before I make myself out to sound like an idiot, I’m a maintenance tech on industrial electronics and mechanical. Saying that my livelihood is based on precision yet I’m being bested by a rough idle on a truck lol I’m only so versed in automotive stuff.


2013 Honda Civic LX 1.8L 178k M1 HM 0w20 with Fram XG7317
2002 Ford Ranger Edge 3.0L 67k Castrol Edge 5w30 with Fram XG3600
Maintenance Technician by trade, working class for life.
Re: Sorry, but I need help again [Re: NavyVet88] #5168590 07/23/19 12:41 AM
Joined: Jun 2019
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A_Spruce Offline
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Something is telling me a dirty MAF sensor, but I have nothing to back that theory up. Did you check the intake snorkel for air leaks between the MAF and intake manifold?


'03 Suburban
Re: Sorry, but I need help again [Re: NavyVet88] #5168596 07/23/19 12:58 AM
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Snagglefoot Online Content
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I would recommend having a close look at your coil pack and inspect it carefully, if it has any cracks, especially in the underside of it, replace it. Motorcraft only.


If you want the job done right......do it yourself.
Re: Sorry, but I need help again [Re: NavyVet88] #5168600 07/23/19 01:23 AM
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Dylan1303 Offline
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With a scan gauge or plug in obd thing. +10 to -10 is acceptable. If your ltft are say -30 that means its pulling 30% fuel over stock map. So that would say leaky injector you know stuff like that. If it was like +30 you would have a large vacuum leak or something since its adding %30 fuel.
Originally Posted by NavyVet88
Originally Posted by Dylan1303
Hows your ltft? That might tell a story


Ltft?


Edit: long term fuel trim. Gotta love google. I have no clue honestly. How would I go about checking this?


12 cruze rs 1.4t 6spd pp 5w30 tuned on 22psi
13 equinox 2.4 awd pp 5w30
Re: Sorry, but I need help again [Re: NavyVet88] #5168603 07/23/19 02:11 AM
Joined: Jun 2012
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oldhp Offline
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Throttle blade clean and IAC valve clean??? MAF sensor clean???


2018 RAM 1500 3.6/8 speed.
2019 Dodge Charger SXT 3.6/8 speed.
"When others cut you down, remember where they came from."
"I don't run...........I just wait"
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