2000 S70 2.4t Rough idle/ stalls P0300, P0342

[socals70]

Thanks for the reply. I just bought a used bosch MAF that is coming off of a running parts car. I pick it up tomorrow. I noticed today the car runs much worse with the MAF plugged in. I will post an updated once the maf is in.

[socals70]

I put in the new MAF sensor today. The code cleared but it still has the idle/stall issue. I am not sure what to check next. I may take it by a volvo shop tomorrow and see if they can figure it out. If they get it I will post the solution here.

[socals70]

I decided to take my car into a Volvo "Specialist" in my area to help find out what the problem is. For $400 he tells me that the problem is a vacuum leak at all of the injector o-rings and one the tubes going to the turbo. He wanted a couple hundred more to fix it. So I took the car back and replaced the o-rings and tube. Absolutely zero difference, still stalls at idle and is hard to start.

Now I'm really considering pulling this motor and swapping in a good one. At this point I have spent more on the current one than it would have cost to swap right off the bat.

If anyone has anymore suggestions please let me know.

[abscate]

That's T for turbo, right?

If you have any leak in the intercooling loop,you car won't idle but will run at mid -rpm with misfires.

You need to inspect the whole loop and take 2 hours to take off each piece, verify clamps are working, replace and tighten. I chased this for a month on my T5

[socals70]

Update*

It has been awhile since I last posted on this but I didnt want to leave this thread without a solution.

So I had the cvvt cam timing checked with the special tools by a volvo tech. The cam gear was not installed properly so the timing was way off. I rechecked the compression and it was very low in 4 of 5 cylinders. Im not sure how i got good compression before but I was getting 80-100 psi in cylinders 1-4 when rechecked.

Unfortunatly I had to pull the head back off and replaced 8 bent exhaust valves. I reinstalled the head and it fired up first try and runs great now. I have put about 1000 miles on it to date without any problems.

Thanks for everyone's help!