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Old 06-13-2022, 05:04 PM   #1
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Join Date: Jan 2022
Default 93 240+t sputtering when giving it throttle

My 93 +t that I'm wrapping up is having an issue where at lower rpms, if I give it gas it will start to sputter, feels like I'm hitting a fuel dump/ cut. This happens more in the higher gears at lower rpm when I push the throttle quickly. If I slowly roll onto the gas then it will pull hard but start to get very rich as I use more throttle (Wideband starts to read as low as 8.5). I am using a 13c at stock 7psi. Im using the 350cc white top injectors. I replaced the 02 sensor but it made no difference, also tried 3 different MAFs, no difference. What else could be causing this?

One thing that could be making a difference is that the narrowband 02 sensor giving signal to the ecu is all the way down in the cat instead of right after the turbo exit. Not sure if that would make a difference?
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Old 06-13-2022, 09:42 PM   #2
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Location: Sweat zone, Arizona

Move your narrowband within 8-12 inches after the turbo, also make sure your fuel filter isn’t clogged if you think you’re not getting enough fuel
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Old 06-14-2022, 06:02 AM   #3
I.M. Weasel
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Join Date: Sep 2011
Location: Driving the No Malarkey Bus

Also which spark plugs are you using and what are they gapped at and how old are they?
Living life one day at a time. Stopping to smell the oil slick beneath my Volvos.
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Old 06-14-2022, 09:37 AM   #4
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Are you still running your stock fpr and maf or did you switch to ones from a turbo car? Have you chipped or swapped your ecu?
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Old 06-14-2022, 10:41 AM   #5
Burnt Sierra Madre
Join Date: Jan 2009
Location: An obscure body in the SK system

check for collapsing of pre turbo piping
Originally Posted by lummert View Post
Dammit, Lummert.
Originally Posted by Jesse8931 View Post
Well keep us updated on how your dumbass plan goes.
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Old 06-14-2022, 05:17 PM   #6
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Location: Bowling Green, KY

I would check to make sure your intake piping isn't collapsing, for sure. Then I would check fuel pressure. Kinda sounds like it's not getting enough fuel...in tank pump not working/filter sock clogged up...fuel filter could be full of crud...etc...
1986 245 Auto (RIP)
1986 245 Auto (RIP)
1988 245, M47
1989 245 Auto California Car (sold)
1993 245 Classic (Bro's Daily)
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Old 06-14-2022, 05:39 PM   #7
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fixed the sputtering issue by changing my spark plug gap from 0.037 to 0.028 on all plugs. Still runs rich asf past 4k rpm. AFRs get down to 8.5 and it looses power.
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Old 06-14-2022, 06:29 PM   #8
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Location: S NJ, a suburb of Phila.

Probably sucking the intake hose to the turbo shut. Make sure to check that the crankshaft pulley isn't slipping.
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.
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