AWD - Chris Mullet / Can you answer this question?

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Chris Mullet / Can you answer this question?

In a nut shell, you DON'T want to approach it the way I did (without the proper latch/unlatch tool).

After thoroughly cleaning the throttle body - no fix.

After replacing the throttle body ($350) - no fix.

Inspected wire connection - looked OK.

At that point I started thinking the problem may be a flaky ECU connection. Watching Youtube videos led me to foolishly try unseating and reseating the ECU with just a long skinny screwdriver as I didn't, and STILL don't, own the removal tool. I got the ECU partially unlatched and couldn't get it completely loose. Nor could I fully RELATCH it. At that point the car would start and idle, but with a horrible lope. I had it towed to the local independent Volvo guru who had the proper tool. He completely removed the ECU and firmly reinstalled it. That was about two years ago and the car hasn't skipped a beat since - well, OK, I did have to replace the spark plugs since then.

To tell you the truth, I doubt that the mechanic disconnected the battery at all. But to be on the safe side it wouldn't hurt to disconnect it and wait 5-10 minutes. Some people will disconnect the negative cable and tap the cable terminal on the positive terminal to help eliminate any residual charge in the system. I would think that would eliminate the need to wait 5-10 minutes.

I hope this helps.

BTW - what year is your S80? Does it have the Bosch or Magnetti Marelli throttle?
Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)


New Chris Mullet / Can you answer this question?
posted by  hf63  on Tue Dec 11 20:42 CST 2018 >

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