Misfires and flashing CEL

[safesaxbdd]

I don't trust them that much. First off all, they nickel and dime. I only had it towed there because AAA will tow within 5 mile radius. I didn't go back to them cause I wanted to.

I think I'll just have them handle AOS and then have it inspected elsewhere... just hope I'm right!

[ecp]

Originally Posted by safesaxbdd

I don't trust them that much. First off all, they nickel and dime. I only had it towed there because AAA will tow within 5 mile radius. I didn't go back to them cause I wanted to.

I think I'll just have them handle AOS and then have it inspected elsewhere... just hope I'm right!

Honestly I’d recommend doing the AOS yourself if you’re mechanically inclined. If you don’t trust them, I wouldn’t trust them to clean the oil out of the runners. If they don’t do that it’ll continue to seem like something is wrong, possibly damage the cats more, and keep smoking.

So say they replace the aos and it keeps burning up the oil in there and they say “it’s still not running right we need to keep looking around”, then what?

[safesaxbdd]

Ok get this - They said after replacing the AOS there wer still misfire codes, did a smoke test and found smoke coming from the bell housing/RMS. "It would appear that when the AOS failed it caused so much vaccuum in the motor that iit sucked the RMS inward and now you ahve a massive crankcase intake leak."

Like, first of all, I'm going to tell them to park the car until I figure out what's going on but like is that even possible?? I guess it's possible but is it likely? I'm at the point where the car is old, enough money has already been put into it and I don't know if it's worth it to keep putting a couple grand more into it. Saddens me but it's the truth.

I feel like maybe the RMS was the only failure? Canthe AOS fail possibly do that?

[ecp]

Originally Posted by safesaxbdd

Ok get this - They said after replacing the AOS there wer still misfire codes, did a smoke test and found smoke coming from the bell housing/RMS. "It would appear that when the AOS failed it caused so much vaccuum in the motor that iit sucked the RMS inward and now you ahve a massive crankcase intake leak."

Like, first of all, I'm going to tell them to park the car until I figure out what's going on but like is that even possible?? I guess it's possible but is it likely? I'm at the point where the car is old, enough money has already been put into it and I don't know if it's worth it to keep putting a couple grand more into it. Saddens me but it's the truth.

I feel like maybe the RMS was the only failure? Canthe AOS fail possibly do that?

I’ve never heard of that happening, but it does sound plausible. Ultimately that would be your choice to make, but if it was my car I’d have it towed back home and start pulling the tranny.

Has the rms ever been replaced?

[911monty]

Originally Posted by safesaxbdd

Ok get this - They said after replacing the AOS there wer still misfire codes, did a smoke test and found smoke coming from the bell housing/RMS. "It would appear that when the AOS failed it caused so much vaccuum in the motor that iit sucked the RMS inward and now you ahve a massive crankcase intake leak."

Like, first of all, I'm going to tell them to park the car until I figure out what's going on but like is that even possible?? I guess it's possible but is it likely? I'm at the point where the car is old, enough money has already been put into it and I don't know if it's worth it to keep putting a couple grand more into it. Saddens me but it's the truth.

I feel like maybe the RMS was the only failure? Canthe AOS fail possibly do that?

Jake Raby has said there are two modes of failure of the AOS. One pulls oil into the intake (most common) In the second the diaphragm fails in the opposite manner and pulls up to 24" water vacuum on the crankcase. This is the most severe mode of failure. Can cause low oil pressure and cause main seals failure.

Found the thread: http://986forum.com/forums/performance-technical-chat/21752-looks-like-aos-but-engine-woes.html

[safesaxbdd]

Thanks for this. Great, so mine is probably the more severe mode of failure. Wonderful. Sounds like pretty much everything can be damaged here.

[safesaxbdd]

Just got the car back after AOS replacement. Did not replace the RMS. It wasn't showing any fault codes on OBDII. I fired the engine and it struggled to turn over, then white smoke out the exhaust again. Shut it off. Not sure if this is normal behavior after a swap?

Doesn't appear to be dripping oil but I'll check in AM again.

[ecp]

Originally Posted by safesaxbdd

Just got the car back after AOS replacement. Did not replace the RMS. It wasn't showing any fault codes on OBDII. I fired the engine and it struggled to turn over, then white smoke out the exhaust again. Shut it off. Not sure if this is normal behavior after a swap?

Doesn't appear to be dripping oil but I'll check in AM again.

Also check your oil level if you haven’t. I’d pull the throttle body and plenum and see if you still have pools of oil in your intake runners. If you do, just clean it out as much as you can and see how it runs after that. I doubt the shop took the time to clean up the mess the aos made when it failed, unless you specifically asked them to.

I know it’s frustrating, but if there’s not a leak at the bell housing, and there’s still oil sitting in your intake I’d say that’s still fair game to get it back on the road.