4T65E Trans Shift Hard, P1811 DTC

[BNaylor]

Originally Posted by RED REGAL

When I took car on to the hiway and held the pedal down car shifted great but when engine got over 4000rpm it started missing and backfiring thru intake also check engine started flashing then light went off.I suspect maybe bad gas I`am going put some gasoline antifreeze maybe water in the gas.any suggestions appreciated!

That may be a good sign as far as getting the "fishbite/chuggle" issue resolved. Meaning TCC locking and unlocking when it shouldn't. A blinking SES/CEL is a "misfire" condition. Most fishbite issues are caused by an ignition issue. Spark plugs, ignition wires, coil pack or possibly ignition control module (ICM).

What brand spark plugs to include heat range/number and ignition wires are you using?

Also, with an odb-ii scan tool you may be able to pull up some stored history DTCs like P0300 (random misfire) or P030X (specific cylinder misfire) to confirm.

[RED REGAL]

Good morning BNaylor thanks for the help,I know the plugs are AC but I don`t Know the #.I will get one one the guys at work to check for codes and get back to you.Thanks Again

[DanOttawa]

Is there a gasket in the accumulator that needs to be replaced??

[BNaylor]

Originally Posted by DanOttawa

Is there a gasket in the accumulator that needs to be replaced??

Yes there is a cover gasket but it may not need replacing unless it comes apart or looks unserviceable but it wouldn't hurt to replace it anyways. See pic below left side.

[DanOttawa]

Thanks for the quick reply BNaylor. Do you know if the gasket is included with the Transgo kit? Also do any of the old springs get re-installed

[BNaylor]

Originally Posted by DanOttawa

Thanks for the quick reply BNaylor. Do you know if the gasket is included with the Transgo kit? Also do any of the old springs get re-installed

You're welcome. Typically the shift kits do not come with the accumulator cover gasket. The Transgo kits have what you see in the pic at link below which includes new 1-2/2-3 accumulator springs.

Transgo Shift Kit Pic

[BNaylor]

However, one kit........the Thrasher shift kit does. See link below.

Click here


BTW - This is the one I installed in my '97 Grand Prix GTP several years ago.

[DanOttawa]

Thanks BNaylor. I'm looking at a forum at LSTech.com that has detailed photos of the install. I think you may have referenced it in an earlier post. I still not sure what happens to the old springs. Do they get re-installed or thrown out. Also someone mentioned to me that you should reset the adapts. Do you know what this means?

[BNaylor]

Depending on the kit the old springs get replaced with the new, if provided. The TAPS means "Transmission Adaptive Shift". Basically you get the TAPS data reset so the PCM module relearns shifting based on driving conditions/habits and other parameters. This is normally done with a GM Tech 2 scan tool at the GM dealership. Also, you can remove the battery negative cable for a few hours and this may clear the old TAPs info stored. In our '99 Regal LS disconnecting the battery negative cable worked. I have the ZZP kit in this one meaning just the spacers were used. No new accumulator springs, etc. And I used Dexron VI ATF.

[RED REGAL]

Well just got back from a 1 hour drive,I put in some gasline antifreeze engines still misses at hi rpm.But I`am liking the way the tranny shifts even the overdrive seems to be less fishbiting.I think I found the ignition problem the wires are original,bad condition.Enough for today now I`am going hunting!!

[BNaylor]

Originally Posted by RED REGAL

Well just got back from a 1 hour drive,I put in some gasline antifreeze engines still misses at hi rpm.But I`am liking the way the tranny shifts even the overdrive seems to be less fishbiting.I think I found the ignition problem the wires are original,bad condition.Enough for today now I`am going hunting!!

The stock OE ignition wires are only good for up to 100K miles give or take. When you decide to replace them use the AC Delco/Delphi Premium Silicone 7mm wires. The best wires around with limited resistance and stay away from aftermarket brands.

On spark plugs I use NGK TR55IX Iridium and/or the AC Delco 41-101 Iridium. The Delco 41-101 plugs are made for GM by NGK.

Good luck!

[XSaaber]

Great thread.

My 2003 Impala started the hard shift at about 100,000 miles, so I had it serviced a month ago. The shop stated it had never been serviced before, and since I had bought it used it didn't surprise me. The hard shift problem didn't go away, though it did improve and it showed the infamous P1811.

Was prepared to lay down the required $500 when I found this thread today. I realize it won't fix the problem if the PCS if it is bad, but isn't life an adventure.

Already ordered the shift kit and will look for Seafoam at a local store. Will check back later with results.

[RED REGAL]

Good morning its Saturday and its been a week since I installed the kit in the accumulator.I just wanted to say the wife says to say THANK YOU to BNaylor the car runs Awesome !!You saved us spending $2800. for a rebuilt transmission.

[BuickRegal1]

I think I may DIY also with the kit as i have same issues. One question, where is the PCS and why can I not change it also when i take the pan off? Is it just too expensive and hard to do when it could be something simpler? Thanks

[maxwedge]

Inside the side cover of the trans not the lower pan, access requires a fair amount of disassembly.