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Old 06-09-2019, 11:12 AM   #51
ZVOLV
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Default E85 Ethanol

Cali gas is already E10.

E85.... Old Volvo don't care! It won't hurt anything. It burns very clean. I plan to run it once I turn up the boost. It's equivalent to high octane gas, but it lowers the MPG.

Sidestory: New cars can throw a lean code if FILLED with E85. I have a fuel tester at the shop. I had ONE modern car in the last couple years with a P0171 and P0172 and it was backfiring thru the intake lean. All checked out until I got the analyzer out and the fuel measured exactly 85% Ethanol.
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Old 06-09-2019, 12:21 PM   #52
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Sidestory: New cars can throw a lean code. I have a tester at the shop. I had ONE modern car in the last couple years with a P0171 and P0172 and it was backfiring thru the intake lean. All checked out until I got the analyzer out and the fuel measured exactly 85% Ethanol.
So running E85 made the car backfire through the intake? Damn. Did it cause a lot of damage?
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Old 06-09-2019, 03:12 PM   #53
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It was a direct injection modern V6. It just ran like crap and was very lean. +40%, or so, fuel trims with no air leaks found. Check engine.light on. I scratched my head for a while on that one until I took a fuel sample and found E85 in the tank. I think Grandma wanted to buy the cheap **** at the pump and picked up the yellow handle... I just ran it outta fuel until it stalled and filled the tank with gasoline.

Note: backfire thru the intake can indicate a lean condition.

Back on topic: try some E85 OP and post back with the numbers! I wanna see how clean she blows.
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Old 06-09-2019, 03:27 PM   #54
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I'm still 3/4 full on 87 gas, not really sure if I want to siphon some out to fill up on e85. I just need to drop my NOx at 25mph by 83ppm, which I think I'm fine now since I did an oil change and retarded timing to 10°, while also blocking the black box diaphragm so it doesn't advance the timing too much when they rev up for the 25mph test.
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Old 06-09-2019, 04:40 PM   #55
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Make sure the engine is breathing cold air only. A cooler mixture has lower nox. You could probably just rig the inside of the air box to only have the cold side open. Then it would be not be seen under visual inpection.

Last edited by dl242gt; 06-09-2019 at 04:41 PM.. Reason: spelling
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Old 06-09-2019, 04:53 PM   #56
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The cats inability to reduce NOx and the fact that it's backfiring both point to an exhaust leak. Cold air being drawn in through a leak will cause both issues.

E85 may make the mixture too lean and actually increase NOx. I wouldn't recommend it.

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Old 06-09-2019, 05:02 PM   #57
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The cats inability to reduce NOx and the fact that it's backfiring both point to an exhaust leak. Cold air being drawn in through a leak will cause both issues.
Yeah I've been battling with a possible exhaust leak. Already replaced all gaskets and piping from the front pipe back. Checked my manifold and see no visible cracks, front pipe is less than a year old. My dad and I welded on an OEM Volvo 240 turbo exhaust with the new cat and checked for leaks. But I have always been hearing the hissing sound when accelerating at the passenger side. I can try and make sure all piping is tightened well before doing the test.
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Old 06-09-2019, 05:52 PM   #58
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The front pipe can develop a sneaky leak right where the bracket for the trans support is welded to the two pipes.
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Old 06-09-2019, 06:45 PM   #59
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The front pipe can develop a sneaky leak right where the bracket for the trans support is welded to the two pipes.
Yeah that's where the last front pipe got its leak along with a mysterious 1" hole that had the exhaust shop confused.
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Old 06-09-2019, 06:49 PM   #60
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Make sure the engine is breathing cold air only. A cooler mixture has lower nox. You could probably just rig the inside of the air box to only have the cold side open. Then it would be not be seen under visual inpection.
A moot point over the thermostat's 80º target temperature which I'm sure it is now during most of the day in LA.
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Folks on here don't know a good deal when they see it.
how psi stock cna support?

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Old 06-09-2019, 07:04 PM   #61
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Yes, but those air thermostats fail and keep giving the engine hot air to breathe which would raise nox.
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Old 06-09-2019, 07:15 PM   #62
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Since I failed the visual inspection because the preheater hose was disconnected and instead used as a second air intake, I put it on and just plugged the heater side of the air box.
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Old 06-10-2019, 11:55 AM   #63
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Since I failed the visual inspection because the preheater hose was disconnected and instead used as a second air intake, I put it on and just plugged the heater side of the air box.
Are you having a hard time with the concept of stage zero?

Asking for a friend ...
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Old 06-10-2019, 12:43 PM   #64
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Are you having a hard time with the concept of stage zero?

Asking for a friend ...
I know what stage 0 is, and I explained to them that the preheater setup is useless in California and they understood. But I just put it back on for the next check so it doesn't fail inspection again.
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Old 06-10-2019, 01:02 PM   #65
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I know what stage 0 is, and I explained to them that the preheater setup is useless in California and they understood. But I just put it back on for the next check so it doesn't fail inspection again.
They understood before you "explained" it to them.

Put your car back together the not Mickey mouse **** way and it will pass.

Last month my car had high Nox, and high everything ...failed smog test, drove down the street, got a new cat. Came back the next day,...and passed. Done.

Don't make owning an old volvo harder than it needs to be.
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Old 06-12-2019, 03:19 PM   #66
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Passed
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Old 06-12-2019, 03:44 PM   #67
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So what did you do to pass?
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Old 06-12-2019, 03:52 PM   #68
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Oil change, set timing to 10° from 2 different timing lights (they recorded 12° though), reinstalled the preheater hose, blocked off the hose from sucking in hot air, blocked off the nipple to the black ignition box, replaced 2 exhaust manifold gaskets that were pitted, made sure all exhaust bolts/nuts were tightened, drove for 25 minutes, and left the car running in the lot.

Kept the 850 yellow injectors, but I'm not sure if it would've affected the smog too much.
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Old 06-12-2019, 04:16 PM   #69
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Well done. I used to pass in NJ without changing anything. Just a fresh tune up and oil change. The only visual check they do here is to see if the converter is there. They even accepted the 3" exhaust on the turbo because the converter is there and it passes emissions.

Now all cars older than 95 here have no inspection requirement.
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Old 06-12-2019, 04:23 PM   #70
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Yeah we all wish it was that easy or lax here.
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Old 06-12-2019, 04:53 PM   #71
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Yeah we all wish it was that easy or lax here.
96 and newer has the OBD II port so they can stand around and just check the computer. OBD I wasn't standardized enough. Might have to do different things to check each cars computer. So they made the cutoff OBD II.
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Old 06-12-2019, 05:20 PM   #72
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96 and newer has the OBD II port so they can stand around and just check the computer. OBD I wasn't standardized enough. Might have to do different things to check each cars computer. So they made the cutoff OBD II.
Here they made the cutoff at model year 2000 for some reason. So even OBDII cars up through '99 have to get the full inspection with dyno testing and gas analysis. Same exact car in a 2000 model year only gets the visual inspection and connection to OBDII.
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Old 06-12-2019, 05:25 PM   #73
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Passed

Well done. Glad we could help.
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Old 06-12-2019, 05:25 PM   #74
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Passed
Congrats! Nice job. I have a few friends who always swear by the "get 'er nice and piping hot right before the test" method. It has worked for me too. Fixing the exhaust leaks and getting timing sorted out helped too I'm sure.

Don't forget to un-block that vacuum hose to the ignition control unit - you'll be down on power as it is now.
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Old 06-12-2019, 06:35 PM   #75
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Looks like your exhaust manifold isn't quite sealed up.
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