Hello Everyone,

Have a 99 S70 Turbo 2.4L

Background: Bought the car with a Bad head gasket $1200(overpaid). I replaced the head gasket after having the head resurfaced. still wanted to overheat, I replaced the Radiator, and all's pretty good temp wise. Iinitially Vida said misfire 2 and 3. but that was due to the head gasket I believe. I replaced the plugs with (not Volvo) iridium NGK. and air filter as sort of a tune up, did not replace fuel filter. but I do have one to put in. one more thing. I have one coil(cylinder 2) where the coil boot always falls off when I replace the plugs. have done it twice because the first ones were from amzon and I learned iridium are better for turbo's? anyway I think that's all of the irrelevant background.

Current issue: a couple days ago it has decided to stall when operating temp and I put it park also noticed it stalls before that, in neutral even. it also has a bouncing idle on the road (like going downhill) it's like It wants to stall but catches itself. I have cleaned the maf and did a pretty good job (LOL) cleaning the ETM. but it's been a bout a month since I cleaned it. I did the previous work because of a hesitation at idle when stepping on the gas. that problems seems to be ok now.
This morning I did kind of a test with everything connected (Maf) drove around and engine cold it started fine and I let it idle for a bit. then drove it. it had that bouncing idle (where it catches itself and bounces back up. got home and that's when I discovered that neutral makes it stall as well. I tried to start it and it kept stalling so due to research I disconnected the Maf sensor and it started different, but still stalled. I was going to see if it drove better with it disconnected.

so that's where I'm at,
I apologize for the length of this post but wanted to give the details of everything.
thanks for reading!

any idea's ?

-Shawn

 

No traction yet.,, no problem. it's not my daily.

but to be more to the point. it would seem that the 99 s70 runs poorly at running temp but better cold? does that make any sense or click with anyone?

 

another thing. started it a little while ago
cel was lit. p0238 possible boost pressure sensor.

 

does anybody have any idea's? could this be the issue ? also when I reset the ecu it's runs ok.