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Question about my 99 Jimmy
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non24guy
New User
Jul 19, 2014, 3:30 PM
Post #1 of 6
(1854 views)
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Question about my 99 Jimmy
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Got a question about a 1999 Gmc Jimmy 4x4 4.3 with a 4l60E I bought about 6 months ago. got it for $600 here in ky from a lot. it was a trade in and the dealership just wanted it off their lot cause it has a salvage title.
While I was checking it out I noticed it had a few issues. The intake gasket was blowed and the spider injector needed some work. It was jumping rpms pretty bad, so I figured it was from the intake issues and the spider. Bought it, brought it home, got the intake parts and the part for the spider and everything went together just fine. replaced the plugs, wires, and thermo. flushed the coolant, replaced vacuum lines and changed the oil and the motor is purring like a kitten. no leaks, no vacuum leaks. nothing.
After getting the motor in good shape, the rpm jump is still there. sluggish take off, 1st and 2nd hit hard and 4th seems not to exist. reverse lags. so, checked tranny fluid, kinda darkish red but at level. dropped the tranny pan and it was good. nothing on the magnet. changed the tranny fluid with new filter and problem is still there. Than I started to notice this clicking in the kick panel on the passenger side. it was the tccm. unhooked it and the tranny is working 90% perfect. reverse still lags alittle and take off is kinda sluggish but the rpms isnt jumping anymore. its shifting smoothly into all 4 gears. 4x4 isnt working but im ok with that.
I guess the tccm is bad giving the wrong info to the trans? and now im getting the p1870 code. detecting slippage. 5 months into driving it without the tccm, its done great. now im hearing this whirling sound in tune with the rpms. doesnt do it in netural or park. only in gear and it sounds like its coming from the torque converter.
mileage? i really dont know. I don't believe its the orginal motor or trans. 3000 miles into driving it and the oil is still at level and clean and the coolant hasnt leaked a drop. doesnt burn a drop and tranny fluid is still at level and red. speedo says 175k but it runs like its just alittle over 100k.
so any input on this p1870 and tccm would be great. been looking at the transgo kit and few other things but figured id get some more opinions.
Thanks
(removed hyperlinks to another site)
(This post was edited by Tom Greenleaf on Jul 19, 2014, 11:54 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Jul 19, 2014, 3:49 PM
Post #2 of 6
(1838 views)
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Re: Question about my 99 Jimmy
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Basically the engine computer is detecting that the torque converter clutch is slipping and setting the P1870 code. This code could be from a hydraulic issue, electrical issue, or mechanical issue that deals with the torque converter clutch system. First thing would be to watch scan tool data and see what the TCC duty cycle and slip speed are. If it is slipping, electrical checks would have to be made, then hydraulic pressure checks. If those things check out, tearing the transmission down and inspection to find out the cause.
If the TCCM is causing problem with the operation of the transmission and engine, it could be corrupting information on the vehicle's data bus. The bus is what all the modules in the vehicle communicate on. To find the problem the TCCM would have to be plugged in and its data stream monitored.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 19, 2014, 3:52 PM)
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non24guy
New User
Jul 19, 2014, 3:54 PM
Post #3 of 6
(1835 views)
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Re: Question about my 99 Jimmy
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ok thanks for responding
there was a time about 5 months ago i did a scan on it with the tccm plugged in and it threw all the tranny codes. but when unhooked it only throws a p1870. kinda weird
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Big_Deddie
User
Jul 21, 2014, 2:22 AM
Post #4 of 6
(1750 views)
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Re: Question about my 99 Jimmy
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While I will not say anything against what DS has said - as I feel that he knows his stuff - and I will, basically, be blasted because I am not a transmission guy at all....
BUT, the P1870 code is a very common code in these 4L60e transmissions. I hope that this is not against the rules, but I am attaching a link to an off-site forum about this code. Ironically enough, the original posted has a 99 blazer and is experiencing your same problem.
Yes, it is against the rules FORUM RULES
I had the 1870 code back a while ago and I went with the Sonnax repair kit. i was lucky enough to find a transmission specialist that would do the reaming for me, so I did not have to purchase the reamer. I think the guy charged me $30 to ream and put the kit in for me.
I have also heard that some shops will just block this valve off and not worry with it. I don't know enough about this to recommend it, but...
I would still listen to DS though...find out all of the options before you decide on a repair method.
Sorry DS - not trying to step on your toes, just trying to help...
(This post was edited by Hammer Time on Jul 21, 2014, 2:25 AM)
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Big_Deddie
User
Jul 21, 2014, 7:33 AM
Post #5 of 6
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Re: Question about my 99 Jimmy
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Thank you Hammer Time and I apologize for breaking that rule. While I did read the rules before hand, I could not remember if it was allowed or not. I knew that if it did violate the rules, someone would catch it and modify.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jul 21, 2014, 12:49 PM
Post #6 of 6
(1731 views)
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Re: Question about my 99 Jimmy
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Big_Deddie, you can give advice any time. There is not anything in the forum rules stating that only mods or pros can give advice. The only time some of us may raise a red flag is if the advice your giving doesn't relate at all to what the poster is having a problem with. The advice you gave is good because you pointed out a possibility for the OP's code. I'm not the type to light you on fire, so no worries.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 21, 2014, 12:50 PM)
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