00 S70 GLT SE woes

[fresh70]

guys. i feel like a complete idiot.

when i did the PCV kit and removed the intake manifold to shine it up, i never put that banjo bolt back in. don't know how i missed it.

anyway... it runs like a freaking top now and it only cost me ~$600 in parts trying to figure out what was wrong. i plan on running fuel system cleaner through it. gotta bleed the brakes, attach the new fender liners and mudflaps, some sundries here and there, go get an alignment and get it detailed. she's ready to roll!

[fresh70]

So, how did it run prior to the accident? Has it basically sat for most of four years in a coma? How much run-time has it had since you started cranking it? Maybe the rings took a set and slightly bound. They could loosen up. pour a cap of seafoam in the cylinder and let it sit a day or so. Can't hurt, right? Do you have a borescope available to look for scoring? Or a leakdown tester for confirmation on rings?

ran perfectly. it was incredibly well-maintained. i bought it at 88,000 miles in 2015. it's currently at 111,000. wrecked it in november 2016, but it still ran fine. the only warning light i got was that my headlight was out. i drove it a little bit here and there just to keep it "fresh" but never more than a few miles at a time. it did sit long enough for the fuel to go really really bad, so i jumped the fuel pump and ran as much of it out as i could, filled up with 93 and fuel system cleaner, ran the old injectors until it was likely the old fuel was all gone. i do have to change the fuel filter still. new injectors are on.

i did a wet compression test and cylinder #2 was right at 200psi. i plan to drive it enough to get rid of all of the oil and then do a compression test again. i have a leakdown tester so i'll do that if it doesn't come back at least 150psi. also have a borescope so i can do that if i need to. right now the goal is just to get it buttoned up and ready for winter. my S60R needs the garage space... summer tires in indiana don't work to well in the winter lol.

thank you for the reply.

[fresh70]

well, i buttoned it all back up. drove around the block a few times - sure enough, cylinder 2 misfire. what's interesting though is that there's also a misfire in cylinder 3 which had perfect compression. idle is a little rough, some power loss. ordered new coils to eliminate all possibilities outside the head before i'm forced to take it off. also ordered a stage 1 hilton tune as well as an injector tune because i swapped to white injectors. i suppose the possibility does exist that i've modified too many things to rely on the stock ECU flash. i'll report back with results when the coils and the tune are complete.

[fresh70]

still stumbling.

cylinders 1 and 2 seem to be unaffected by me pulling either the coil or the injector plugs. strong compression across all five cylinders. fuel pressure is rock steady at 50psi. took the injectors out, cleaned and tested. injectors have good voltage at the connectors, good resistance, fuses and relays all checked out. waiting on my coil-on-plug spark tester so i can eliminate that as an issue. i know no one is replying, but i'm staying with the updates in case someone else has this problem in the future.

i do believe i have an exhaust leak somewhere between the exhaust manifold and the downpipe, through the turbo.

[abscate]

Is that with all new coils? We are reading with you!!

[fresh70]

all new coils and they've been swapped around to eliminate that possibility. issue is following cylinder 2. i've been told it's plausible that the crank/cam sensors could be working less-than-perfectly and not throw codes, so i've ordered the crank sensor. waiting for that to come in and i'll make the swap. exhaust leak was debunked, it's all air-tight. i had thought maybe one of the connectors were bad, but spark comes back strong across all 5 as well. injectors are spraying propertly.

next after that i guess is to disconnect the cat and see what's up. i live in a state that doesn't do emissions so i'll just straight pipe it if that's the case.

everything i've purchased has been Volvo OE or better.

[fresh70]

Crank sensor didn't fix it. Misfire cylinder 2...

[scot850]

It is so frustrating when you get these weird issues.

If is only one cylinder I would think it is un-likely the crank or cam sensor. I would have expected it to be more random across the board.

I am more concerned about the low Cylinder #2 reading. Yes the oil in the cylinder could point to bad piston rings. They may not be broken but may have got stuck in the grooves while sitting.

I know you swapped the coils to try to eliminate the misfire in cyl #2. It would appear you have eliminated a bad coil as the issue. Have you confirmed the wiring to the coil is good and it is getting a good ground through the mounting bolt?

I would suggest 2 things to check. I had a 2000 V70 SE that came with a bunch of random warning lights. Even new coils did not fix the misfire, until I found one of the new OE coils was bad out the box. Replacing with a used one fixed the issue until a new exchange item was received.

How are the spark plugs? Remove cyl #2 plug and check there is no crud down in the seating area of the plug as it may prevent proper seating of the plug. When I first get a 'new' car one of the things I do is remove and replace the plugs and carefully remove all the crud from the spark plug hole and threads. Some thin strips of cotton, wd-40 (yes it has a use!) and some long small screwdrivers and picks to remove the mess that gathers over the years. Wrapping the cotton cloth around a screw driver and damping it with WD-40 and then twirling it in the threaded hole cleans the threads.
Make sure the threads on the spark plug are clean and the crush washer is not damaged. Re-install the plug and torque it correctly. Then see if there is any change.

Lastly the one thing I had done was removing the ECU and TCU and having the contacts cleaned by the dealer using a cleaner product for contact made by Wurth. They then seated, removed it and repeated carefully 2-3 times. Problem then went away.

Neil.

[fresh70]

It is so frustrating when you get these weird issues.

If is only one cylinder I would think it is un-likely the crank or cam sensor. I would have expected it to be more random across the board.

I am more concerned about the low Cylinder #2 reading. Yes the oil in the cylinder could point to bad piston rings. They may not be broken but may have got stuck in the grooves while sitting.

I know you swapped the coils to try to eliminate the misfire in cyl #2. It would appear you have eliminated a bad coil as the issue. Have you confirmed the wiring to the coil is good and it is getting a good ground through the mounting bolt?

I would suggest 2 things to check. I had a 2000 V70 SE that came with a bunch of random warning lights. Even new coils did not fix the misfire, until I found one of the new OE coils was bad out the box. Replacing with a used one fixed the issue until a new exchange item was received.

How are the spark plugs? Remove cyl #2 plug and check there is no crud down in the seating area of the plug as it may prevent proper seating of the plug. When I first get a 'new' car one of the things I do is remove and replace the plugs and carefully remove all the crud from the spark plug hole and threads. Some thin strips of cotton, wd-40 (yes it has a use!) and some long small screwdrivers and picks to remove the mess that gathers over the years. Wrapping the cotton cloth around a screw driver and damping it with WD-40 and then twirling it in the threaded hole cleans the threads.
Make sure the threads on the spark plug are clean and the crush washer is not damaged. Re-install the plug and torque it correctly. Then see if there is any change.

Lastly the one thing I had done was removing the ECU and TCU and having the contacts cleaned by the dealer using a cleaner product for contact made by Wurth. They then seated, removed it and repeated carefully 2-3 times. Problem then went away.

Neil.

I've been considering pulling the ECU out and TCU out, just wary because it's ME7. The (brand new) plugs across all 5 come out black as the night, but I assumed that was due to needing a tune. I actually assumed it would be running rich to be depositing that much carbon, but Hilton says it's coming back super lean. I checked voltage on all of the coil connectors and fuel injector connectors, as well as resistance on the injectors. I used a coil-on-plug tester set to .028 to confirm strong spark on all cylinders. The threads are clean everywhere... I'll pop in the garage tomorrow and borescope the cylinders to see how they look. I have contact cleaner and I'm not intimidated about cleaning connectors, more so that it's going to get very expensive very fast if I do it wrong. I don't know any good Volvo shops around my parts and the only dealer is scammy. I suppose that is a possibility. The ECU cover was cracked in the crash and until a few weeks ago it was exposed to open air under the hood.

[abscate]

140 psi is fine for turbo wear spec is 125 psi or so.

Skip the tune until you get this other stuff sorted out. It won’t fix bad things