Guest imported_blazer1997 Posted July 30, 2003 Share Posted July 30, 2003 Tranny problem started tonight. On E-way can off ramp that had little upgrade at about 50mph transmission started shifting back and forth. this was in overdrive. Went to D position and kicked passing gear in and every thing was ok. Just when in overdrive approching hill or incline start giving more gas transmission starts jerking.Any food for thought on this problem? Please don't tell me time for a rebuild. Thanks kyreatta <img src="http://www.aaca.org/ubbthreads/images/graemlins/confused.gif" alt="" /> Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted July 30, 2003 Share Posted July 30, 2003 Just started reading 89 service manual states poss it could be the modulator causing rough shifting when in overdrive? Any suggestions. Link to comment Share on other sites More sharing options...
2seater Posted July 30, 2003 Share Posted July 30, 2003 Does it actually shift into and out of lockup? Do the rpms change when this happens? An engine misfire will be much more evident when under heavy load and the converter locked up, which can be caused by many things, such as plugs, wires, coil pack, ignition module etc... Link to comment Share on other sites More sharing options...
Guest EDBS0 Posted July 30, 2003 Share Posted July 30, 2003 Good analysis 2seater, would also check transmission fluid level, smell and color <img src="http://www.aaca.org/ubbthreads/images/graemlins/confused.gif" alt="" /> Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted July 30, 2003 Share Posted July 30, 2003 It actually shift in, and out of lockup without any increase of rpm. Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted July 30, 2003 Share Posted July 30, 2003 transmission fluid changed in March of 2003 by shop known for over 12 years. Link to comment Share on other sites More sharing options...
padgett Posted July 30, 2003 Share Posted July 30, 2003 I have never seen a trans shift in and out of lockup without a change in rpm (usually jumps about 500 rpm). Sounds to me like a secondary ignition misfire - bad coil will feel like it is bucking and most likely on a hill around 1500 rpm (50 mph). Link to comment Share on other sites More sharing options...
Rawja Posted July 30, 2003 Share Posted July 30, 2003 Lemme second Padgett's analysis, a failing coil pack feels like transmission problem, manifests its self under light to moderate loads at those speeds, sorta kinda, like what a manual transmission feels like when its lugging, intermxed with smooth moments where it feels like the transmission has found the appropriate gear. It won't set any codes either. Will cost you under 100 bucks, and take 10 minutes to change out even if you lack merchanical skills.Definately worth doing. Link to comment Share on other sites More sharing options...
charlie1 Posted July 30, 2003 Share Posted July 30, 2003 had similar problemturned out to be clogged fuel filtergood luckcharlie Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted July 30, 2003 Share Posted July 30, 2003 Padgett thanks for your information. You hit the nail on the head regarding what it feels like. Today checked the RPM's while the shutter started, and the RPM's did not increase. Spoke to my transmission tech, and he also stated it prob the coil pack also.Thanks everyone for the information. Change the coil-pack this week-end.If anyone has a good GM # for the coil pack hit me back with the number.This for a 1989 Reatta. Thanks KYReatta <img src="http://www.aaca.org/ubbthreads/images/graemlins/laugh.gif" alt="" /> Link to comment Share on other sites More sharing options...
Rawja Posted July 31, 2003 Share Posted July 31, 2003 There have been a number of people who have used Jacob's High performance coil packs:As recommended by EDBSO:Jacobs JAC-321412 Ultra Coil Pack $82.69. From Summit Racing 1-800-230-3030 Alternatively, ANY auto parts store you walk into should have in stock a the "standard" coil pack, as it was used extensively on GM's myriad of vehicles that carried the 3800 engine. Link to comment Share on other sites More sharing options...
Shelby Posted July 31, 2003 Share Posted July 31, 2003 The Jacobs coil, New 8mm High quality wires (properly routed),new plugs, PVC valve with new rubber grommet and replace ALL the vacuum Hose. You will be amazed how much your car will run and start. Link to comment Share on other sites More sharing options...
padgett Posted July 31, 2003 Share Posted July 31, 2003 Third that - would also get Jacobs coilpack for "C" engine. Still have plans to find out if a "L" or S/C coilpack and ESC module will interchange, just have not scared one up yet.Also like AC Rapidfire plugs gapped at .040". Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted July 31, 2003 Share Posted July 31, 2003 Called summitt today regrading the number you provided for a coil pack JAC-321412 ultracoil pack for $82.69. Not being made any longer.Just wanted to let know. Link to comment Share on other sites More sharing options...
Guest EDBS0 Posted August 1, 2003 Share Posted August 1, 2003 Jacobs is the manufacture, go directly to them. Their Customer service and Tech Lines are open Monday thru Friday from 8 am to 5 pm Eastern Time.To speak to a representative, please call 1-910-277-3917 Link to comment Share on other sites More sharing options...
Guest Motu 56 Posted August 1, 2003 Share Posted August 1, 2003 I had the same problem that was solved with a new coil pack. Before I changed the coil pack I would manually shift from 3rd to 4th and that also solved the problem. Link to comment Share on other sites More sharing options...
Guest imported_blazer1997 Posted August 6, 2003 Share Posted August 6, 2003 Hello EveryoneTranny problem solved today 08/06/03. Replaced coilpack about 10 minutes did a test drive problem solved.Thanks to all for suggestions made.If anyone needs a coil pack try rockauto.com For 89 reatta price was $77.99 factory GM part with one year warranty. Part # DD1D552 Thanks KYReatta <img src="http://www.aaca.org/ubbthreads/images/graemlins/tongue.gif" alt="" /> Link to comment Share on other sites More sharing options...
grm Posted August 7, 2003 Share Posted August 7, 2003 thank you for getting back with us, i have seen where there was posts and a lot of advice was given but in return never hear how the problem was solved. thanks again for your final reply i am sure this will help someone else in the future. grm Link to comment Share on other sites More sharing options...
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