850r failing emissions miserably (HC and CO) Topic is solved

[JayPea44]

Sveedy, I just remembered the vacuum T was for my manual boost controller. Edited above. JayPea sorry for the OT in your thread.

No problem!

[JayPea44]

Little update - The vacuum line that connects to the passenger side on the inlet manifold was completely disconnected from the manifold, managed to wangle my hand in there and get it connected back up. The coolant temp sensor is connected, haven't tested it yet. Won't have a chance as I'm out of town for a few days. I did pick up a few lengths of fuel/vacuum lines to replace some vacuum lines and the fuel line from the pressure regulator.

Does anyone know the ID of the fuel line off the regulator? I see IPD sells a piece to fit but it's 10 bucks, wondering if I can just use some of the SAE fuel lines I have if it's a close enough match.

[JayPea44]

Update for historical purposes.

Replaced PCV (did the glove test and it blew up and looked like a roosters head) but after the new system it was fine, no smoke from the dipstick, and passes the glove test. Some of the old parts were very clogged. Time for some new oil and filter.

Replaced wires, air filter, plugs, distributor, and rotor. The plugs were dark, which is to be expected, and the air filter was also horrible. Other stuff looked relatively new but still replaced it anyway.

Replaced the fuel regulator hose, the old one was rotten. I have also ordered some more vacuum lines as the ones from the turbo to the TCV look awful. Also, have some injector seals on the way as the old ones look like they need replacing.

Still smells unbelievably rich. I did disconnect the battery and was hoping to see the LTFT change but it stayed at 14... not sure why. Thinking I might throw a forward o2 sensor at it next and see what it does.

[WhatAmIDoing]

Keep searching for that vacuum leak. It might need to be driven some to get it to relearn the fuel trims.

[JayPea44]

I did give it a quick look over and all the lines seem ok. Gonna do the DIY test and spray some brake cleaner around while it’s running to see if I can find it.

[hausmeister]

If you need a reference, mine pulls -0.6 bar (vacuum) in idle.

[JayPea44]

Thanks, I don't have a vacuum gauge at the moment, but if I don't find an obvious leak I'll probably go find one to check the system, they're only about 15 bucks.

[JayPea44]

OK another update - I got a vacuum gauge and tested my vacuum, I was getting 15 inhg vacuum before I replace my TCV vacuum lines and now it's slightly lower, between 14 and 15, after replacing them. I also inspected and swapped out some worn-looking elbows but everything else looks relatively decent. I also did the "spray brake cleaner around all the connections to see if the idle changes" trick and it didn't budge.

So my question is, is that a normal reading? The needle is solid and doesn't move at all at idle, and to me, that seems like a decent reading for an engine this old that is also turbo'd (but I don't know - also bearing in mind I'm a mile above sea level). A little bit of googling tells me anything over 14 is "normal" on these, but not sure if I can trust that. Also, if it is a little low would a leak this small really put my emissions readings so high?

I'm starting to think I'm chasing my tail on this vacuum leak and thinking it's more a sensor, probably the o2 or MAF. (I had an old classic mini that had a bad MAP sensor and it ran rich as a pig which is making me think this is sensor related..)

Any input is greatly appreciated.

[matthew1]

Still no codes?

[JayPea44]

Nope. No codes. I’m gonna take it on a longer drive to see if I can get anything to show its head.

Also. After resetting the LTFT it’s now reading 20. Which seems crazy high. The STFT fluctuates between 0 and 29. No other number.