940 Engine cut at 2500rpm on load B230FK

Karelitos · 06-15-2022, 04:00 PM

Hi yall who are smarter with the beastly redblocks than me.

Basically i have a problem with my 940 B230FK (automatic sadly).
Under load and stepping on the gas the car cuts near somewhere 2500rpm (any other rpm range is fine.

Upped the boost on that car last year, was running fine, Max about 12-13psi

Last i thought it was a vaccum leak from the crank breather since it was cracked but i replaced it. But now Im thinking that the stock fuel table just isnt setup for that kind of boost on that load.
But if any of you can figure out if something else is causing this im more and happy to try fixing it or upgradeing something to get rid of the problem.

Example Video https://www.youtube.com/shorts/SPRD4...nnel=NotCayden

Best wishes
Your baltic tank engine enjoyer

dl242gt · 06-15-2022, 04:11 PM

Check the air intake hose from the air mass sensor to the turbo intake. If that hose is soft it can be sucked shut under high airflow.

How is the spark plug gap? You can get spark blowout under high load if the gap is too large or the plugs have weak spark.

Janspeed · 06-17-2022, 08:03 AM

If the cut is total/complete then it's the ECU protecting the engine from overboost.
Dial that boost down a bit and see what will happen. Another thing you could try is losening the wastegate actuator rod. If that's too tight it causes spoolup to be too fast and the engine gets a boost spike which it can't process. Because the ECU can only match X amount of fuel.

Karelitos · 06-20-2022, 09:36 AM

Quote:

Originally Posted by Janspeed

If the cut is total/complete then it's the ECU protecting the engine from overboost.
Dial that boost down a bit and see what will happen. Another thing you could try is losening the wastegate actuator rod. If that's too tight it causes spoolup to be too fast and the engine gets a boost spike which it can't process. Because the ECU can only match X amount of fuel.

Yes thank you. Im sure its the ECU protection. But in no way I want to Drive with the stock boost… And yes the boost does spike so ill see of loosening it Will help. Thank you kind stranger!

Bloody244 · 06-20-2022, 12:27 PM

an electronic boost controller would help had one on my 240 had option of low, scramble button and rpm based boost

06-15-2022, 04:00 PM	#1
Karelitos Newbie Join Date: May 2021	Engine cut at 2500rpm on load B230FK Hi yall who are smarter with the beastly redblocks than me. Basically i have a problem with my 940 B230FK (automatic sadly). Under load and stepping on the gas the car cuts near somewhere 2500rpm (any other rpm range is fine. Upped the boost on that car last year, was running fine, Max about 12-13psi Last i thought it was a vaccum leak from the crank breather since it was cracked but i replaced it. But now Im thinking that the stock fuel table just isnt setup for that kind of boost on that load. But if any of you can figure out if something else is causing this im more and happy to try fixing it or upgradeing something to get rid of the problem. Example Video https://www.youtube.com/shorts/SPRD4...nnel=NotCayden Best wishes Your baltic tank engine enjoyer

06-15-2022, 04:11 PM	#2
dl242gt Old and boxy but good. Join Date: Jun 2002 Location: S NJ, a suburb of Phila.	Check the air intake hose from the air mass sensor to the turbo intake. If that hose is soft it can be sucked shut under high airflow. How is the spark plug gap? You can get spark blowout under high load if the gap is too large or the plugs have weak spark. __________________ Dave, 1982 242 turbo. 338k miles. MVP coilovers and 3" exhaust. Flowed 405 with a V15. Cossie turbine housing with upgraded compressor housing. 90+, IPD remote oil filter. Some other goodness, too. Been lots of fun over 25 years. Restored in 2k. Now ready for a 2nd restoration. 1993 245 Classic, 440k miles, enem V15. IPD bars and chassis braces. Simons sport exhaust from Scandix. sbabbs ezk chip. Been a good road warrior. Genuine Volvo rebuilt leaky M47.

06-20-2022, 12:27 PM	#5
Bloody244 Board Member Join Date: Jul 2019 Location: Germany	an electronic boost controller would help had one on my 240 had option of low, scramble button and rpm based boost __________________ '87 244 B230R @14psi 19t, V16t cam, Haltech Elite 1500, Stage 3 overboostracing.se 530 Head, ACM H-beam rods, Do88 intercooler, Accumulator Mod AW71 Instagram https://www.instagram.com/blue__244/ Rip '87 B230f+t it did not stay window free 25.06.2021

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06-17-2022, 08:03 AM	#3
Janspeed Board Member Join Date: Sep 2005	If the cut is total/complete then it's the ECU protecting the engine from overboost. Dial that boost down a bit and see what will happen. Another thing you could try is losening the wastegate actuator rod. If that's too tight it causes spoolup to be too fast and the engine gets a boost spike which it can't process. Because the ECU can only match X amount of fuel.