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#Misfire and stuttering under load.

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sun Feb 19, 2017 4:43 am 
In Neutral
Joined: Sat Dec 03, 2016 5:23 pm
Posts: 28
Sorry didn't see your reply. I do not know of the age but the temp gauge seems to be working correctly, not sure if that means anything.

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sun Feb 19, 2017 4:55 pm 
Fifth Gear
Joined: Fri Jun 20, 2008 8:17 am
Posts: 6205
Location: Lakewood, Wa 98439
There are 2 coolant temp sensors. 1 for the ecu and one for the gauge. The one for the ecu goes bad and it causes all sorts of problems.

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91 L-TW Wagon with a full Swap -RIP
92 SS Prefaced, GD dash swapped, 22T/205 Hybrid 20 psi - BEAST!
93 SS Bone Stock Gone!
94 TW Bone Stock Gone!
91 SS 4EAT Sold!
98 LGT 4EAT
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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sun Feb 19, 2017 5:02 pm 
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Joined: Sat Dec 03, 2016 5:23 pm
Posts: 28
Ohhh I did not know this. Where is the Ecu one located?

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sun Feb 19, 2017 5:04 pm 
Fifth Gear
Joined: Fri Jun 20, 2008 8:17 am
Posts: 6205
Location: Lakewood, Wa 98439
Its under the intake manifold threaded into the coolant crossover tube. Both of them are side by side. The single wire sensor is for the gauge and the double wire sensor is the one you want to check out.

If that doesn't change your issue, I'd also suspect fuel pump?

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91 L-TW Wagon with a full Swap -RIP
92 SS Prefaced, GD dash swapped, 22T/205 Hybrid 20 psi - BEAST!
93 SS Bone Stock Gone!
94 TW Bone Stock Gone!
91 SS 4EAT Sold!
98 LGT 4EAT
98 LGT Wagon 4EAT


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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sun Feb 19, 2017 8:57 pm 
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Joined: Sat Dec 03, 2016 5:23 pm
Posts: 28
Thanks, I found it. Ordered a new one since it was pretty cheap. I checked the fuel pressure before and I'm getting over 30psi at idle so I don't think its the pump.

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sun Feb 19, 2017 9:02 pm 
Fifth Gear
Joined: Fri Jun 20, 2008 8:17 am
Posts: 6205
Location: Lakewood, Wa 98439
Oddly enough it still can be. Your symptoms are extremely similar to an issue I had and could not find the culprit, even with help from a several friends.

I could drive the car just fine but as soon as I tried to get on it hesitation bucking and popping from the intake. Went at it for a long time with swapping parts. Finally one day the pump just died. Swapped in another good pump and I had full boost and drive ability. It literally had everyone stumped.

I swapped maf, cam, crank, cats, throttle bodies, coils, ignitor, and any other stupid sensor I could think of...

Sent from my SM-N920T using Tapatalk

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91 L-TW Wagon with a full Swap -RIP
92 SS Prefaced, GD dash swapped, 22T/205 Hybrid 20 psi - BEAST!
93 SS Bone Stock Gone!
94 TW Bone Stock Gone!
91 SS 4EAT Sold!
98 LGT 4EAT
98 LGT Wagon 4EAT


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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sun Feb 19, 2017 9:17 pm 
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Joined: Sat Dec 03, 2016 5:23 pm
Posts: 28
Wow that sounds like my exact issue. If this sensor doesn't fix it, i'll throw a new pump in and see what happens.

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sun Feb 19, 2017 9:18 pm 
Fifth Gear
Joined: Fri Jun 20, 2008 8:17 am
Posts: 6205
Location: Lakewood, Wa 98439
For what it's worth I bought an aem 320lph pump on ebay for 100 bucks.

Sent from my SM-N920T using Tapatalk

_________________
91 L-TW Wagon with a full Swap -RIP
92 SS Prefaced, GD dash swapped, 22T/205 Hybrid 20 psi - BEAST!
93 SS Bone Stock Gone!
94 TW Bone Stock Gone!
91 SS 4EAT Sold!
98 LGT 4EAT
98 LGT Wagon 4EAT


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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Mon Feb 20, 2017 10:48 pm 
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Joined: Sat Dec 03, 2016 5:23 pm
Posts: 28
Well the sensor didn't fix it. It was cheap so its no big deal. I found a walbro with install kit on ebay. If that doesn't fix it then I might have to give up lol.

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Thu Feb 23, 2017 11:47 pm 
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Joined: Sat Dec 03, 2016 5:23 pm
Posts: 28
Well I give up. Fuel pump didn't help at all, it was a good idea though. Other than a bad injector which I have no way to test, I'm out of ideas. I guess I'll just drive it like it is til it blows lol

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Thu Feb 23, 2017 11:48 pm 
Fifth Gear
Joined: Fri Jun 20, 2008 8:17 am
Posts: 6205
Location: Lakewood, Wa 98439
You can test if you have an idea which injector might be giving you problems.

Sent from my SM-N920T using Tapatalk

_________________
91 L-TW Wagon with a full Swap -RIP
92 SS Prefaced, GD dash swapped, 22T/205 Hybrid 20 psi - BEAST!
93 SS Bone Stock Gone!
94 TW Bone Stock Gone!
91 SS 4EAT Sold!
98 LGT 4EAT
98 LGT Wagon 4EAT


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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sun Feb 26, 2017 1:59 am 
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Joined: Sat Dec 03, 2016 5:23 pm
Posts: 28
How do I test? Couldn't find anything online.

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sun Feb 26, 2017 2:06 am 
Fifth Gear
Joined: Fri Jun 20, 2008 8:17 am
Posts: 6205
Location: Lakewood, Wa 98439
If you can get an idea of which cylinder is giving you a problem, you can swap that injector to a different cylinder and see if the issue follows it.

Sent from my SM-N920T using Tapatalk

_________________
91 L-TW Wagon with a full Swap -RIP
92 SS Prefaced, GD dash swapped, 22T/205 Hybrid 20 psi - BEAST!
93 SS Bone Stock Gone!
94 TW Bone Stock Gone!
91 SS 4EAT Sold!
98 LGT 4EAT
98 LGT Wagon 4EAT


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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sun Feb 26, 2017 7:24 am 
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Joined: Sat Dec 03, 2016 5:23 pm
Posts: 28
Oh I'm not sure which one it is, or if it's an injector at all.

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Tue Feb 28, 2017 5:00 am 
Fifth Gear
Joined: Tue Mar 13, 2007 12:56 am
Posts: 2317
Location: 10-9-oh(!), wa
I've been experiencing a similar issue with bucking/missing but only under positive manifold pressure. I figured it was merely the original knock sensor, so I picked one up from RockAuto, but it didn't solve the issue. So I checked the plugs and it must have been a while since I last replaced them because the gap was out to .050"+. I tightened them up to .035" and it runs much better. I'm still going to get a new set of plugs, but its surprising how much better it runs with a tighter gap.
I see that you replaced the plugs in yours, but what did you set the gap to?

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93 legacy wagon L, 22T swapped (TW imitator) now with five forward speeds.
johndrivesabox wrote:
Rally, my kyboard is brok, his has nohing o do wih h liquor.

Originalcyn wrote:
Apparently everyone hates Gabe.


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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Wed Mar 01, 2017 1:59 am 
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Joined: Sat Dec 03, 2016 5:23 pm
Posts: 28
Already tried that unfortunately. Gapped them all to spec.

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sun Mar 26, 2017 3:14 pm 
Fifth Gear
Joined: Tue Mar 13, 2007 12:56 am
Posts: 2317
Location: 10-9-oh(!), wa
Any changes?

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93 legacy wagon L, 22T swapped (TW imitator) now with five forward speeds.
johndrivesabox wrote:
Rally, my kyboard is brok, his has nohing o do wih h liquor.

Originalcyn wrote:
Apparently everyone hates Gabe.


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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Mon Mar 27, 2017 10:09 pm 
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Joined: Sat Dec 03, 2016 5:23 pm
Posts: 28
Haha nope. Some drives are worse than others but it still misfires until you get past like 3k rpm. Then it clears up, It hates being down low.

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Tue Mar 28, 2017 4:03 am 
First Gear
Joined: Sun Jan 22, 2012 8:16 am
Posts: 119
Location: Yakima WA
How is the condition of your intake piping I had a similar issue before I put a catch can set up and deleted my bpv. Do you have oil building up in your intake track at all?

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Mon Jun 19, 2017 2:54 am 
Fifth Gear
Joined: Tue Mar 13, 2007 12:56 am
Posts: 2317
Location: 10-9-oh(!), wa
Welp... my hesitation/stutter is back. Does it much worse before its warmed up.
Have you found any resolution to your issue?

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93 legacy wagon L, 22T swapped (TW imitator) now with five forward speeds.
johndrivesabox wrote:
Rally, my kyboard is brok, his has nohing o do wih h liquor.

Originalcyn wrote:
Apparently everyone hates Gabe.


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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Mon Jun 19, 2017 4:45 am 
Winestone Cowboy
Joined: Thu Mar 26, 2015 4:12 am
Posts: 323
Location: Lake Stevens WA
I had a similar situation before I swapped to a coil in plug setup.....Don't know if that helps at all, also cleaned all the grounds in the engine compartment(intake and firewall) probably didn't do anything but maybe???

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Tue Jun 20, 2017 3:32 am 
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Joined: Sun Jan 22, 2017 6:43 am
Posts: 10
this is a shot in the dark but i had a similar issue with an intermittent misfire and it ended up being the ignition coil. there were hairline fractures that were causing a short circuit. it was raining one day i opened the hood and you could see the electricity arching. I upgraded to a MSD8239. Im non turbo so idk how similar your ignition system is.


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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Tue Jun 20, 2017 5:05 am 
Fifth Gear
Joined: Tue Mar 13, 2007 12:56 am
Posts: 2317
Location: 10-9-oh(!), wa
luceleaf wrote:
this is a shot in the dark but i had a similar issue with an intermittent misfire and it ended up being the ignition coil. there were hairline fractures that were causing a short circuit. it was raining one day i opened the hood and you could see the electricity arching. I upgraded to a MSD8239. Im non turbo so idk how similar your ignition system is.

That's an interesting observation. I've been thinking it was a fuel/ecu problem this whole time. I have a spare coilpack I can swap in and report on the effects. Thanks for the suggestion.

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93 legacy wagon L, 22T swapped (TW imitator) now with five forward speeds.
johndrivesabox wrote:
Rally, my kyboard is brok, his has nohing o do wih h liquor.

Originalcyn wrote:
Apparently everyone hates Gabe.


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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sat Jun 24, 2017 1:57 am 
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Joined: Sat Dec 03, 2016 5:23 pm
Posts: 28
Sorry it's been so long guys after the winter the car was put away and I haven't messed with it until this week. Getting the fuel injectors flow tested and cleaned will post an update. Also I already tried the ignition coil.

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 Post subject: Re: Misfire and stuttering under load.
PostPosted: Sun Jun 25, 2017 2:32 am 
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Joined: Sat Dec 03, 2016 5:23 pm
Posts: 28
Well injectors did not fix the problem... I'm officially stumped. Might just have to take it to a subaru dealer and see if they can diagnose it...

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