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CA SMOG FAIL: High HC @ Idle Only

Called it on the dead cat from day one...

Volume test on the fuel system once you have the pressure tester. That will help. Also tape the fuel pressure gauge to the windshield, go for a drive, see if it rises in boost. A dead in-tank usually will prevent pressure from doing what it should. Also could be the coupler hose from the in-tank to the sender that starts splitting as pressure increases.

IC's can split as well, worth a look. That's definitely a good place to have a pressure tester to induce system pressure and look for leaks.

Brake booster and check valve good?

87* stat won't cause what you're fighting.

Checked that you have the correct EZK and LH boxes in there? I've seen people swap in non-turbo EZK's which run too much timing for a turbo car.

Drop the gap on the plugs down to .028", see if that helps.

Wires ohm out correct?

Did you buy this car from the Sac area? There was one I tried to help diagnose for 2 different folks, never did find a damn thing on what it was doing what it was doing. Check if there's a blockoff plate in the EGR pipe to intake manifold connection. Symptoms sound damn similar...
 
The car won't rev past 4700 rpm, and bounces around there like an elastic band, it "feels" like a boost leak

I can hook up my cheapo Bosch graduated boost gauge tomorrow, for some better diagnostic. Fuel gauge is riddling me with fittings/adaptions, and where to mount it.

This was the TB classified's PNW Free Car with half a million miles.

I can pull plugs tomorrow, and confirm gap is in spec. I'll test the brand new Magnecor 8.5mm wires, just to be sure. I haven't touched the ECU/EZK, but assume they're in order....the original owner's name is written on the ECU, and the EZK is a gold box. I don't think I'd have made it the past 1500 miles without the boost issue, if the computers were incorrect. No EGR block-off. I had that apart myself, when I cleaned and resealed everything. I think booster & check valve are okay...I THINK
 
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Yikes, I can't figure out a fitting to the schrader valve on the rail. Looks like my cheapo fuel guage kit didn't have that one. I wonder if the rentals at Oreilly's will do?
 
Ugh, this car!

Fired it this morning, barely started, hardly idled, stalled. CEL came on 3-2-2

Went and cleared the code, and got it to run. CEL won't leave cluster, though it's showing a 1-1-1 when I read.



Add to it this....not a drivability issue but another reason to pull my hair out. If I have the lights on, and car in reverse, the directionals won't work. Related or not...I DON"T KNOW but this is exhausting and frustrating.

Parking it and driving a Toyota
 
It looks like the Chinese replacement MAFs Volvo is selling are thick film technology instead of the original hot wire and I don't think they are interchangeable/compatible. Other people have had issues with them including this 13 year old thread from the E46 Fanatics forum.

https://www.e46fanatics.com/threads/hot-wire-and-hot-film-maf.811136/

Let me know if you want to borrow a factory fuel pressure gauge and adapter.
 
hiperfauto said:
It looks like the Chinese replacement MAFs Volvo is selling are thick film technology instead of the original hot wire and I don't think they are interchangeable/compatible. Other people have had issues with them including this 13 year old thread from the E46 Fanatics forum.

https://www.e46fanatics.com/threads/hot-wire-and-hot-film-maf.811136/

Let me know if you want to borrow a factory fuel pressure gauge and adapter.
Click to expand...
yeah, I'm onboard with that, thanks.

Hmm, this AMM thing is a head scratcher. May put the old one back in, and see if the miss in boost goes away
 
Hey, the 4700 thing got me to thinking...have you ohm'd out the coil primary and secondary side yet? I had a coil go out, caused some really wacky stuff. Swapped in an Accel, ran even worse by a big margin, think that thing was bunk. Swapped in a fresh-yard coil, fixed a bunch of stuff. The old one ohm'd out fine cold, hot it was WAY out of spec. Seemed fine until I started loading it down in boost or winding out in the rev's.

No experience on the MAF.
 
Code 3-2-2 from the Bentley Guide
"LH-2.4: Air mass meter hot wire burn-off function not working

My next step will be to pull, inspect, confirm gap on plugs. Swap back old AMM (I didn't have the boost misfire before I swapped AMM/O2 Sensor/Injectors). And I can ohm out coil. I did in Seattle, in October, when I got this car running. It was fine then.


I didn't know the Hot Film VS. Hot Wire riddle on AMMs. Reading the listing on FCP more carefully, it says that this IS the Hot Film. Could/Would/Should this cause a misfire like I'm experiencing?
 
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Back with updates, and what I'd call "Good News"

I removed the screen from my old 016 AMM, cleaned the hot wire, and reassemled. Replace the "NEW VOLVO HOT FILM" unit and the car fired right up...no choking, no feathering throttle. It may be the first time it sounded like a healthy car.

Funny thing, a CEL came back. I read code 1-1-1 which is NO FAULTS, but why the CEL? Only way to clear was disconnect battery and touch battery leads.

I'll go road test in a moment...


PS my other sidebar complaint about right turn signal not working in reverse is solved....ground fell off tail light assembly.
 
Either the ECU or the EZK can turn on the CEL. Stick the little probe wire into socket 6 for EZK (vs. socket 2 for ECU) and read the other codes.

[and I'm still looking for a big flat box]
 
UPDATE:

I didn't know I could/need to check both the #2 & #6 diagnostic ports. Since the codes are clear now, I'll wait for a next CEL to test both.

Drove around town, and car drives, boosts & idles as it should. Did some pulls on the freeway, and it boosts without a miss and revs past 5k with ease.

Amazing, that all I needed to do was clean the AMM correctly, and that Volvo supplies incompatible parts. I'll put some more mileage on it and see what comes of this all.
 
bobxyz said:
Either the ECU or the EZK can turn on the CEL. Stick the little probe wire into socket 6 for EZK (vs. socket 2 for ECU) and read the other codes.

[and I'm still looking for a big flat box]
Click to expand...
Thanks again for teaching me about both modules to test for CEL.

I had to move the car this morning, to get another car from the vault. The Volvo threw a CEL, though ran fine.

I checked, and it was from the EZK module. I swear it read a 1-5-4, though I can't find that code anywhere else. So maybe a 1-4-3, or was that a 1-4-4? I will stay alert if it comes back, as I've cleared it for now.
 
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