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Old 11-02-2021, 11:19 PM   #1
getouttamyway
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Default Fuel cut?

1990 240 with the complete drivetrain from a 1991 940t swapped in. Bone stock except open intake and injectors from an 850. Runs great on stock boost. When I splice in my MBC and turn it up to 10 psi it gets a hard cut around 8-10psi under load, not necessarily WOT though. I can't figure out the problem but I'm reading conflicting numbers on my injectors. Notably the charts show 31lbs/hr but at 3.8bar. any one know if these might be the culprit:

0-280-155-831

They're yellow/orange for reference.

Plugs are BP7ES

Last edited by getouttamyway; 11-02-2021 at 11:30 PM..
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Old 11-03-2021, 12:11 AM   #2
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Do you have an AFR gauge? Is say your leaning out.
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Old 11-03-2021, 12:30 AM   #3
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Orange tops are plenty of injector for 10psi.

Bp7’s should be fine too. You can throw some bp8’s at it if you want but that probably won’t fix anything.

Check the simple stuff first. Vac lines are good? Turbo pipe clamps are tight? Grounds are all good? That open intake…as in there’s no filter before the amm? It won’t like that.
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Old 11-03-2021, 12:39 AM   #4
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I've gone over everything, all new vac hoses. It passed emissions great at the stock psi so I know it's in good tune. I've got a k&n cone filter clamped right on the AMM.

Here's the injectors I'm running. This site lists them at 31lbs @ 30psi, so it sounds like they are indeed fine: https://www.injectorplanet.com/produ...sch-0280155831

I don't have an AFR gauge, figured it's pretty close to stock so I wouldn't need it...

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Old 11-03-2021, 02:16 AM   #5
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MAF signal @ 5V= fuel cut.
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Old 11-03-2021, 05:35 AM   #6
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How close is your AMM to the turbo? If its to close to the turbo it will cause some problems. Your probably have it set up like factory but I just thought Id make a mention of it. Also, is both fuel pumps working.
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Old 11-03-2021, 08:00 AM   #7
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is the turbo intake collapsing? 8-10psi is well shy of the required airflow to hit fuel cut.
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Old 11-03-2021, 10:16 AM   #8
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Quote:
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How close is your AMM to the turbo? If its to close to the turbo it will cause some problems. Your probably have it set up like factory but I just thought Id make a mention of it. Also, is both fuel pumps working.
I'm using the stock intake s-shaped pipe connected to the AMM with a cone filter on it.
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Old 11-03-2021, 10:19 AM   #9
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Quote:
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is the turbo intake collapsing? 8-10psi is well shy of the required airflow to hit fuel cut.
That was my first thought but j read a comment saying if that's the issue it will be a soft loss of power vs mine is a very hard cut. I'll see if I can find a way to stick my GoPro under the hood though and confirm.
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Old 11-03-2021, 10:52 AM   #10
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Quote:
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I've got a k&n cone filter clamped right on the AMM.
probably not your issue but this is not helping
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Old 11-03-2021, 12:48 PM   #11
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i had this problem when my ignition timing was off, it was a 20° not at 10°
is the k&n filter with oil if so that isnt the best for the amm
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Old 11-03-2021, 01:13 PM   #12
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Would be worth piece of mind pulling the plugs out and making sure they’re gapped within spec. My 16 valve car will blow the spark out if the plugs aren’t gapped tight enough.
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Old 11-05-2021, 09:54 AM   #13
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Quote:
Originally Posted by getouttamyway View Post
That was my first thought but j read a comment saying if that's the issue it will be a soft loss of power vs mine is a very hard cut. I'll see if I can find a way to stick my GoPro under the hood though and confirm.
watch the boost gauge, if you have one... it'll swing back into vacuum without lifting off the gas. It's never been soft for me, it's always been abrupt
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Old 11-05-2021, 11:11 AM   #14
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Quote:
Originally Posted by linuxman51 View Post
watch the boost gauge, if you have one... it'll swing back into vacuum without lifting off the gas. It's never been soft for me, it's always been abrupt
I believe I'm suffering from the same
issue, the data log shows exactly what you're talking about. I also had the diaphragm fail in my WG actuator so it was spiking up to 28psi then dropping instantly. Here's my temporary/ maybe permanent solution if it works. Waiting for new WG diaphragms to show up. I had a massive oil leak from the turbo oil feed when the nipple snapped off in the block which drenched everything with 15w40 including the air filter. This in turn pulled a pretty good vacuum on my pcv system which then sucked a bunch of oil through my intake. Total cluster fudge. Anyway I stuck this smaller intake pipe I think I got off a fwd Volvo inside the rubber pipe, we'll see what happens next when the WG diaphragm shows up.

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Old 11-05-2021, 07:57 PM   #15
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Quote:
Originally Posted by linuxman51 View Post
watch the boost gauge, if you have one... it'll swing back into vacuum without lifting off the gas. It's never been soft for me, it's always been abrupt
My boost gauge kind of stutters and maybe dips a little but really quick. The dial is 0-15 so no vac shown.

I noticed the intake pipe at the turbo end does look kinda squished. I couldn't catch any action on my GoPro, to hard to mount a camera with a good view but I should try a new pipe as others are suggesting as well.

Sounds like the factory piece is NLA and the aftermarket ones are garbage. Thinking some silicon adapters and a bent tube?
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Old 11-05-2021, 08:38 PM   #16
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^^get what you need.

http://www.siliconeintakes.com/
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Old 11-06-2021, 03:50 PM   #17
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Don't know who told you the aftermarket replacement turbo hoses aren't good. They have worked fine in my experience. Or assemble your own setup as above. If your intake hose between the turbo and amm is soft then it's getting sucked shut.
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Old 11-06-2021, 04:21 PM   #18
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fwiw my cheap replacement turbo hose is holding up to well over 20psi.

If yours is indeed getting sucked shut, wouldn't you see vacuum on the boost gauge?

edit: yea what kenny said.
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Old 11-06-2021, 07:23 PM   #19
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Good to know. I just saw a bunch of whining about the aftermarkets when I searched for a replacement.
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Old 11-09-2021, 11:12 AM   #20
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So my metal reinforced intake hose doesn't seem to be the problem anymore, I think I'm hitting compressor surge over 26psi. I'm going to change the inlet piping one more time to see if it still happens.

Edit: I found a compressor map for a td06-20g, I have a td05-20g China turbo, and it looks like I'm ptobably hitting surge, it's making close to 600cfm at 27psi. I'm sure the head and plumbing won't support that kind of flow.

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Old 11-11-2021, 08:07 PM   #21
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Alright got a new intake hose in (MTC) and checked my plug gaps are correct. Still having the issue.

Checked my ignition coil and its ohm'ing out below the spec in the manual. Thinking this could be the problem. Any recommendations on replacement? I like to keep things OEM when I can... Sound like the 740 16v is a good upgrade?
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Old 11-11-2021, 08:48 PM   #22
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740 16valve what? Like the head? I’d keep my 240 **** box 8v and make the 8valves do as much work as they can. Gains to be had from getting an actual intake manifold instead of the garbage stock manifold.
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Old 11-11-2021, 08:53 PM   #23
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Quote:
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740 16valve what? Like the head? I’d keep my 240 **** box 8v and make the 8valves do as much work as they can. Gains to be had from getting an actual intake manifold instead of the garbage stock manifold.
Lol no just the ignition coil I'm wondering about as a replacement.
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Old 11-12-2021, 09:31 PM   #24
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MAF signal @ 5V= fuel cut.
Well?
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Old 11-13-2021, 05:10 AM   #25
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Well?
How can I check that while driving?
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