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940 se Fuel Cutoff

G

Grant22smith

New member
Joined
Dec 29, 2015
Location
San Diego
What's up guys, i'm brand new to turbobricks and the volvo community! I bought a 1991 940 se and the first thing i did was rebuild the engine along with new everything (spark plugs, cap & rotor, connecting rods, pistons, O rings, etc.), just got her back from the shop today! we fitted a 16t turbo, boost gauge, mbc and i plan on getting a free flowing 3 inch exhaust next week. every time i give it a little more gas than i would normally, the engine cuts out all power untill i lift my foot off the gas pedal completely. I'm pretty sure that it is fuel cut but like i said i'm new to all of this so i'm not sure. would a fuel/ignition chip fix my problem? if so who can i buy one from? thanks in advance
 
Yup, it's a garden variety fuel cutoff. You can get a 012 AMM, or buy performance LH box chip (ignition chips help general power, but are not related to cutoff, LH does that), or just take your .bin and remove fuel cut.. Whatever floats your boat.
 
how many psi are you boosting?
sounds like you need to hit up TLAO for some chips to get rid of the fuel cut.

so you are in san diego cool
 
nordmaschine said:
Yup, it's a garden variety fuel cutoff. You can get a 012 AMM, or buy performance LH box chip (ignition chips help general power, but are not related to cutoff, LH does that), or just take your .bin and remove fuel cut.. Whatever floats your boat.
Click to expand...

(take my .bin and remove fuel cut) what does this mean
 
Could also be the other common problem where the intake hose in front of the turbo, the rubber one collapses and chokes the motor. Check that. Other trick if you don't have blank 27c256 eeprom chips and a burner is to put a 5.1v zener diode in the line or wire from the AMM that goes to the ECU. The zener diode limits the voltage to the ECU so it won't cut fuel ever.
https://www.google.com/search?q=5.1v+zener+diode&ie=utf-8&oe=utf-8
 
that was one of our earlier problems, replaced that hose and she will pull all the way to about 3800 rpm's in 2nd gear instead of 3000 but right at 3800 i get fuel cut. where can i get a zener diode locally? thank you enormously for the replies they help a lot!
 
Any electronics supply place should have them. Pretty common.

What you do is jump the diode from one pin in the amm connector at the AMM to the ground pin and the diode has to be in the correct way for it to work. The diode is a one way voltage clamp.

http://www.turbobricks.com/forums/showthread.php?t=27648&highlight=AMM+Cut+Clamp


Check make sure your distributor is in correctly. You can't adjust the timing by moving the distributor but you can move it too far and then when your computer tries to advance the timing the distributor gap becomes too much and you lose spark....
 
0
is this incorrect? still get fuel cut
 
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