1998 Buick Regal Repair Question
Asked on October 26, 2011
Recently replaced torque converter solenoid, now what.
Issue originally was hard shifting,******** or not at all shifting unless releasing throttle peddle. Checked engine code, was PO741, torque converter ckt perf/stuck off. Replaced TCC. I thought vehicle was fixed, I was wrong, code is back. Although the trans is shifting way better than pre TCC install, only one occurrence that car actually stalled. Now at certain RPM's, and no specfic driving conditions, I can watch the tach fluxate between 1500-1700 RPM's. My question is what's next to check, another TCC maybe or torque converter?? I am a mechanic by day and sometimes by night :) so if u feel the need that I should check line pressure or anything else plz let me know, and what the read out should be and I can do that. FYI, the TCC that I bought from advance seemed to have trans fluid residue on the new solenoid and packaging. I was hoping that the residue was from manufacture inspection, wishful thinking maybe? I wonder if I got someone's used solenoid. Thank you very much for your time and help!
Replied on October 26, 2011
This is what some who have done the job has to say.
High Speed Surging - Vehicles with 4T65E Transmission
* Surging at high speed may be caused by leaking torque converter regulator valve train bore plug seal.
May set code P0741, TCC stuck off.
* Tcc apply valve and tcc pressure regulator valve both fail causing po741 or po742.This is caused by a worn valve body where the solenoid valves ride in.repair kits are sold for about 100 bucks each plus 50 per valve. The kit contains reamers and oversized drill bits. The updated valves are hardened steel sleeves that are inserted into the valve body after oversizing the ports.The oe valve body wheres because of the pot metal it is made from. The new oversized valves will never where out after this repair
* HAVE DONE THIS ON 4L60E VALVE BODIES FOR A P1870 AND FIRM 1-2 SHIFT. DID 11 VEH.'S. 100% FIXED.
PARTS AVAILABLE AT AXIOM AUTOMOTIVE
Answered by KHLow2008
39,900 answers provided