i appologize if i totally misunderstood what you were talking about, our vehicles will do weird things when our tire sizes aren't calibrated
ugh. electrical
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| surging problem http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=46919 |
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| Author: | JNJ-Z [ Sun Oct 04, 2009 6:25 pm ] |
| Post subject: | surging problem |
is it normal at 45mph, when my jeep shift into over drive that the motor surges up and down? it seems to go away at 50 or higher! i didnt notice it before i changed my exhaust. any ideals???? |
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| Author: | Jeepjeepster [ Sun Oct 04, 2009 9:53 pm ] |
| Post subject: | |
Are you talking about the jerking when it locks in 4th? Normal unless its getting worse or something. Lock out O/D till you get above 50mph and it'll be better. |
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| Author: | JNJ-Z [ Sun Oct 04, 2009 10:01 pm ] |
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thanks jeepjeepster,-its the engine thats surgering (the rpms) |
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| Author: | Jeepjeepster [ Mon Oct 05, 2009 9:39 am ] |
| Post subject: | |
ohh, the rpms are going up and down? Are they slowly changing or are they bouncing? Sometimes the torque wont know what to do if you give it a certain amount of gas and it will partially unlock and lock but its hard to feel it, you can watch the rpms slightly change on the tach. |
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| Author: | JNJ-Z [ Mon Oct 05, 2009 7:27 pm ] |
| Post subject: | |
yes thats it, the tach moves up and down |
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| Author: | JeepinJarhead03 [ Sun Oct 11, 2009 5:19 am ] |
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mine does that but: only below 70 degrees ambient and only within 15 minutes of starting and ONLY on 87 octane |
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| Author: | KJWildman [ Sun Oct 11, 2009 7:36 am ] |
| Post subject: | |
Sounds like maybe the trans is beginning to slip in OD. How many miles on the KJ now? |
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| Author: | JeepinJarhead03 [ Sun Oct 11, 2009 1:13 pm ] |
| Post subject: | |
it's not a slip only happens when you coast in a gear that it would typically not be in if your foot was on the gas, happens in non-od gears too 3.7's are known for surging and idling weird plus alot of people forget with all those fancy wires and things under the hood to inspect and replace their vaccume lines as necessary mine's only done it once since the pcm/tcm upgrade but it used to do it pretty consistantly but only under the conditions that i previously stated |
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| Author: | BugginKJ [ Sun Oct 11, 2009 2:47 pm ] |
| Post subject: | Re: surging problem |
JNJ-Z wrote: is it normal at 45mph, when my jeep shift into over drive that the motor
surges up and down? it seems to go away at 50 or higher! i didnt notice it before i changed my exhaust. any ideals???? I don't know what year yours is (too lazy to read today or find out) but I know for the 42RLE trans they have a TSB for torque converter repalcement and flash to help ease that problem........ |
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| Author: | JeepinJarhead03 [ Sun Oct 11, 2009 3:13 pm ] |
| Post subject: | |
dunno if it's specific to the 42 , i've got the 45 and it did it prior to the B&G upgrades and i've had it do it since then atleast once i hate to guess but I think it's nature of the 3.7 and it's timing / spark knock handling unless i've completely misunderstood the OP it's an 'idle' surge while coasting, about 250rpm twitch with about a 1 second interval |
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| Author: | JNJ-Z [ Sun Oct 11, 2009 8:01 pm ] |
| Post subject: | |
thank you all, i posted an update in the bad transmission post, the stealership told me that i need my computor reclaibrated because i had p225 tires now i have p235 tires does this sound right???and when it shifts into overdrive its at the wrong speed |
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| Author: | JeepinJarhead03 [ Mon Oct 12, 2009 2:42 am ] |
| Post subject: | |
i appologize if i totally misunderstood what you were talking about, our vehicles will do weird things when our tire sizes aren't calibrated ugh. electrical
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