Compression test procedure

[mickeytee]

Sorry i dont have experience with replaceing just the boots. I usually just replace the coil if its bad.

 

[travisd]

Sorry i dont have experience with replaceing just the boots. I usually just replace the coil if its bad.

How do I know if the coil or boots are bad? I could not find any cracks or tears in the boots. There no carbon trails in the boots but the boots are slightly larger than the plug and dont seal on to the ceramic but i assume that normal for this ignition system? The replacement boots fit very tight on the spark plug though. The springs look slightly tan.

Would you replace the coils from what I'm describing?

 

[travisd]

Charge air cooling system is a little bit more involved, it has you using the tech2 to cycle the electric pump.

How about procedure for changing and flushing transmission fluid and filter,rear differential and hydraulic top fluid??! Plus what fluids gm recommends currently for all 3?
Thank you!!

 

[luxuryrules]

How about procedure for changing and flushing transmission fluid and filter,rear differential and hydraulic top fluid??! Plus what fluids gm recommends currently for all 3?
Thank you!!

Got you fam. Gimme a day or two on the procedures, I’ll note that I’d personally avoid flushing the trans for me it’s just a pan drop fluid and filter change. The info about fluids we do have here:

Post in thread 'Compression test procedure'
Compression test procedure

 

[mickeytee]

Be sure to get the proper trans fluid with all the additives in it. Last tsb from gm changed what was called for in the owners manual using 12378261 with 88900330 limited slip additive.
I think it now calls for 88862624 dextron ls. There are dozens of similiar priducts.

 

[luxuryrules]

Adding some context, as Mickey observed there are some part number supercessions, for historical reference and searchability. Manual in car calls for 75w90 12378261 meeting GM spec 9986115; and 4oz limited slip additive 1052358. In attached chart, they show 89021677 and same limited slip additive. Looking up either of those numbers we can see they are both superseded by 88900401, which still requires addition of limited slip additive which has been superseded by 88900330 alt number 104003.

What I can’t find is if there is any difference between 88900401 and 88862624 (alt number 104034) Dexron LS gear oil with the limited slip additive already added. They’re both fully synthetic 75w90 gear oil that meet GL-5 spec. My ATS uses the Dexron LS gear oil, I wonder if there is any reason *not* to use the same Dexron LS in the XLR.

 

[luxuryrules]

Diff fluid replacement…. And interestingly enough the service manual does call for 2.12 quarts (2 liters) of Dexron LS gear oil

 

[luxuryrules]

I’ll be doing this job soon myself. Transmission service. It calls for removing the transmission mount nuts: there are four, torque spec is 50Nm.

 

[luxuryrules]

Transmission fill procedure and then check procedure. Check to be done when trans temp is between 86-122 degrees F, check plug torque spec is 25Nm.

 

[travisd]

Be sure to get the proper trans fluid with all the additives in it. Last tsb from gm changed what was called for in the owners manual using 12378261 with 88900330 limited slip additive.
I think it now calls for 88862624 dextron ls. There are dozens of similiar priducts.

The trans fluid need additives also? So I need 88862624 dextron ls and 88900330 additive for the trans or is this for the diff? I read my trans takes dexron6 and that's what was used from factory? I still haven't ordered my service manual so I just wanted to be clear. I may have a person I trust who has a large tranny shop do it for me and hopefully show me how to service the trans. I have access to a lift but I have zero experience with this drivetrain setup. Is there anything specific to Cadillac in the transmission or rear end or is that all same as Corvette service work?

Be sure to get the proper trans fluid with all the additives in it. Last tsb from gm changed what was called for in the owners manual using 12378261 with 88900330 limited slip additive.
I think it now calls for 88862624 dextron ls. There are dozens of similiar priducts.

 

[travisd]

Adding some context, as Mickey observed there are some part number supercessions, for historical reference and searchability. Manual in car calls for 75w90 12378261 meeting GM spec 9986115; and 4oz limited slip additive 1052358. In attached chart, they show 89021677 and same limited slip additive. Looking up either of those numbers we can see they are both superseded by 88900401, which still requires addition of limited slip additive which has been superseded by 88900330 alt number 104003.

What I can’t find is if there is any difference between 88900401 and 88862624 (alt number 104034) Dexron LS gear oil with the limited slip additive already added. They’re both fully synthetic 75w90 gear oil that meet GL-5 spec. My ATS uses the Dexron LS gear oil, I wonder if there is any reason *not* to use the same Dexron LS in the XLR.

So I want 88900401 gear oil and 104003 additive for rear diff?

Got you fam. Gimme a day or two on the procedures, I’ll note that I’d personally avoid flushing the trans for me it’s just a pan drop fluid and filter change. The info about fluids we do have here:

Post in thread 'Compression test procedure'
Compression test procedure

 

[travisd]

Got you fam. Gimme a day or two on the procedures, I’ll note that I’d personally avoid flushing the trans for me it’s just a pan drop fluid and filter change. The info about fluids we do have here:

Post in thread 'Compression test procedure'
Compression test procedure

Can flushing the transmission cause issues? I've actually never flushed one in any of my cars. Ive always just dropped the pan or sucked it out the fill tube and seems only get about half the fluid either way. I was thinking there could be different brands or even kinds of tranny fluid in it currently. Had tranny cooler replaced and guy couldn't remember what kind of fluid specifically was used to top it off after that.

 

[luxuryrules]

Based on the info in the procedure from post 27, use Dexron LS and do not add any friction modifier. It already has friction modifier in it. 88862624 Is the current part number. That is for the rear differential.

Re:flushing, I may be a little risk averse but I’ve heard too many stories about flushing transmissions causing issues. That’s why I’m partial to a pan drop, recognizing it doesn’t get all the fluid but to me that’s better than risking causing an issue with a flush. Dexron VI is the stuff you need, it’s been around for a long time, that’s for the transmission.