2008 2.5T engine shudder stuttering at high speed

hu5ker555 · Post by **hu5ker555** » 16 Nov 2016, 07:29

2008 S60 2.5T, 163k miles

At highway speeds (roughly 60 mph), if I try to accelerate significantly the engine shudders/stutters/stumbles and I have to back off the gas. At one point, the check engine light flashed but then went away. The engine idles just fine and there is no check engine light on. My first try will be to clean the MAF. Then I may try to pull codes (even though there is no CEL on). I might also try replacing all spark plugs.

Any other suggestions/comments?

Post by **oragex** » 16 Nov 2016, 14:06

From past posts, seems similar to one (not all) ignition coil failure. No need to replace all as these don't wear like the spark plugs. Just get one and replace one by one then test. Also look at the cables going to the coils, sometimes they get crushed under the cover.

hu5ker555 · Post by **hu5ker555** » 17 Nov 2016, 11:29

Thanks. I cleaned the MAF but no improvement. Will replace the spark plugs next. Then will try your suggestion using one new ignition coil (trial and error).

Could it be a fuel delivery or turbo-related issue?

Post by **jonesg** » 18 Nov 2016, 18:20

You're guessing, these cars require a code reader, it was the first thing I bought when I got my volvo, can't do much without it.!

hu5ker555 · Post by **hu5ker555** » 18 Nov 2016, 18:56

I have a code reader that works on my S80, but not on my S60. I took it to O'Reilly and they couldn't get their code reader to work either. Said my OBD port might be broken.

Post by **abscate** » 19 Nov 2016, 02:58

Probably just a fuse..check them. The OBD port is just wires to the ECU

hu5ker555 · Post by **hu5ker555** » 19 Nov 2016, 07:48

My cheap Autel OBD2 (MS300) reader won't connect. O'Reilly's wouldn't connect either. So I tried Autozone. Theirs worked...misfire on cylinder 4.
I replaced all 5 spark plugs and things seem much better. Will give it the full test later today.

Any suggestions on an OBD2 code reader? Anyone else have problems with an Autel?

hu5ker555 · Post by **hu5ker555** » 19 Nov 2016, 07:48

My cheap Autel OBD2 (MS300) reader won't connect. O'Reilly's wouldn't connect either. So I tried Autozone. Theirs worked...misfire on cylinder 4.
I replaced all 5 spark plugs and things seem much better. Will give it the full test later today.

Any suggestions on an OBD2 code reader? Anyone else have problems with an Autel?