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Old 04-16-2012, 06:44 PM   #1
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Stalling as I stop

Just did a 8.8 and SYE mod.

Jeep was down for 45 or so days. Drives fine now, but as I come to a stop from speeds around 35 or more, as soon as I stop, the rpms keep falling to zero. I have a 95 YJ with 4.0L with 5 spd manual.

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Old 04-16-2012, 10:18 PM   #2
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Well, if anyone is interested, I was on a half tank of fuel, so ran sea foam through the intake and poured half a bottle in my tank and filled all the way up. Seems to have mostly curtained the stalling at stops except the most severe hills when I'm braking on the downslope... Anyone have any other ideas other than just after 45 days the gas got funky?

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Old 04-16-2012, 11:00 PM   #3
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Why did you pour sea foam in the intake? How much? And did you change your oil after you did? Your gas did not go bad in 45 days. Please stop using sea foam. The two most likely causes of your problem are vacuum leak or slow moving oxygen sensor.
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Old 04-17-2012, 12:22 AM   #4
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No vacuum leaks, that was the first thing I checked. Engine runs great. Idles amazing, great power. Only problem is that it stalls when under "negative load".

Guy at the parts store suggested sea foam and I've heard great things about its engine cleaning properties. I was thinking o2 sensor, but truthfully don't know enough about it to know how it would affect my rig.

No, I did not change my oil after using it. Is that an issue?
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Old 04-17-2012, 03:41 PM   #5
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Got the engine code pulled today... "no speed sensor reading" I think was the gist of the report. I put a used SYE in and the blue plastic collar speedo gear on the output shaft was half melted. I have ordered a replacement from advanced adapters (my best guess as to the manufacturer) for $3.71 plus $7 in shipping. As of now I have no speedometer. Apparently my 95 rig monitors that sort of thing and when slowing down from higher speeds, the back pressure is enough to stall out the engine...
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Old 04-18-2012, 12:36 AM   #6
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Nice! I hope that fixes it. I would change the oil though, just in case that sea foam got into the crank case. Let me know how it turns out.
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Old 06-25-2012, 08:17 PM   #7
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I have an 02 TJ. The speedo stopped working today and now it stalls while slowing.

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Originally Posted by Siffo3012 View Post
Got the engine code pulled today... "no speed sensor reading" I think was the gist of the report. I put a used SYE in and the blue plastic collar speedo gear on the output shaft was half melted. I have ordered a replacement from advanced adapters (my best guess as to the manufacturer) for $3.71 plus $7 in shipping. As of now I have no speedometer. Apparently my 95 rig monitors that sort of thing and when slowing down from higher speeds, the back pressure is enough to stall out the engine...
I pulled the speedo gear out of the transfer case, it all seems fine. What else could it be?
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Old 06-26-2012, 05:52 AM   #8
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Nice! I hope that fixes it. I would change the oil though, just in case that sea foam got into the crank case. Let me know how it turns out.
Why the hate of seafoam? I've had good luck with it myself in the past and am always willing to listen to why I shouldn't be using it, assuming you have a solid point.
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Old 06-28-2012, 09:47 AM   #9
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Update:

I fixed my stalling problem. Apparently, because my speedo wasn't working due to needing a new collar for the SYE output shaft, the computer was not operating correctly by compensating for fuel flow at stops... As soon as I got the part and got the speed sensor to engage with the output shaft, problem solved.
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Old 06-30-2012, 02:50 PM   #10
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That was the problem. $45 and 15 minutes later, good as new.
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Old 06-30-2012, 06:48 PM   #11
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Why the hate of seafoam? I've had good luck with it myself in the past and am always willing am, to listen to why I shouldn't be using it, assuming you have a solid point.
Do you fill up at a marina? No, than you probably don't need it. I don't hate seafoam, it's just that I've never seen it fix anything other than a boat. Marina's tend to get water in their fuel, thats why boats have water separators. I've heard all the claims; it fixed this, it fixed that, my grandpa says I have to put it in my OBD III multi port super brain hybrid half gas half nuclear fusion Prius or it won't run in the winter. I was a technician for thirteen year and a service writer for the last seven, in the "Land of ten thousand lakes", and I've never had to reach for a can to fix a car. I just hate seeing people waste money on things they don't need.

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