So, on the XC 70... still waiting to see if electrical problems require the rebuild of the cem. We've noticed a whistling sound, mainly when accelerating, heavy on the throttle (not stomped to the floor... just a normal acceleration). It's seems like it'ssometimes louder when the wheel is turned ...

Thanks for the input... @Fataqui --- Is there any way to be sure you're getting a good used CEM? I mean, if you started my car, even drove it for a couple days, you'd say the CEM must be just fine. Heck you could drive it for a week. And ... how much is that spiffy all new upgraded one from those ...

Car - 2004 XC70
Diagnostic Equipment - Vida / Dice although I'm very inexperienced with it.

I've been trying to track down an intermittent communication / module failure issue for a month or so now. I can go 200+ miles between issues. Here is a link to the thread I was working thru ... https://www ...

Hello - sorry for asking this in two places, but I thought perhaps it might be good to have it in it's own thread anyway.

I can get the CEM out of my XC70, but when I tried to remove the connector to clean it, I can't get it out. I loosed the bolt all the way and pulled like crazy, but it doesn't ...

UPDATE -- Thought I had it fixed! Drove 200 plus miles, including a trip to the PIT airport and a return trip a couple days later, about 100 miles each way, total of maybe 400+ trouble free miles. Drove through an absolute torrential downpour most of the way back from the airport, no issues. The ...

Ok... so a good day with some good updates, but a frustrating evening on a couple counts. First... the car. Drove a total of 70 ish miles today without an incident. As a point of reference, the last time we drove prior to cleaning the ECM and TCM, she had issues starting at 20 minutes or so and ...

Thanks! I wish I had an excuse like not having a light, but I've got a nice one.... Just couldn't spot the release... at least I now know I was looking in the right area. I thought about taking off the connectors where they sat.... I'll get those cleaned up tonight.

So far, I did the 12 mile drive ...

Thanks... can you give me a more detailed descrip of the Transmission connectors at the Air box? Sorry to be dense, but I'm just not spotting them. I found a single connector directly in front of the air cleaner box, connected with a wire release, which I cleaned. And then directly in front of the ...

So... tonight I pulled both the ECM and TCM, and scrubbed the pins with a tooth brush and contact cleaner. They didn't look corroded, but who knows. I added some dilectric grease and reinstalled. Then I tried to take the CEM out to clean the large plug, but I couldn't figure out how to get it to ...

Oh... also... what's the recommended brand of contact cleaner? Preferably something I can buy locally instead of having it shipped....
Thanks!