93 240+t sputtering when giving it throttle

HELLOW · 06-13-2022, 05:04 PM

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?

Radtap · 06-13-2022, 09:42 PM

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

VB242 · 06-14-2022, 06:02 AM

Also which spark plugs are you using and what are they gapped at and how old are they?

widewagon92 · 06-14-2022, 09:37 AM

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?

apachechef · 06-14-2022, 10:41 AM

check for collapsing of pre turbo piping

intothelabyrinth · 06-14-2022, 05:17 PM

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...

HELLOW · 06-14-2022, 05:39 PM

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.

dl242gt · 06-14-2022, 06:29 PM

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

06-13-2022, 05:04 PM	#1
HELLOW Board Member Join Date: Jan 2022	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?

06-13-2022, 09:42 PM	#2
Radtap Board Member Join Date: Dec 2020 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 __________________ Feedback

06-14-2022, 06:02 AM	#3
VB242 I.M. Weasel 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.

06-14-2022, 05:17 PM	#6
intothelabyrinth Board Member Join Date: Mar 2012 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) 1988 245 (turbo manual swapped) 1990 245 (getting turbo manual swapped) 1991 245se (rat rod project, turbo aw71 swap) 1969 164 (trying to make it run) Instagram

06-14-2022, 06:29 PM	#8
dl242gt Old and boxy but good. Join Date: Jun 2002 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. __________________ 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.

06-14-2022, 09:37 AM	#4
widewagon92 Board Member Join Date: Apr 2020 Location: Maryland	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?

06-14-2022, 05:39 PM	#7
HELLOW Board Member Join Date: Jan 2022	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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