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Volvo 240 struggling to turn off

J

J240dl

New member
Joined
May 13, 2023
I have an 87 Volvo 240dl with a few very minor mods. The car runs and drives fine but when I go to turn off it doesn’t immediately turn off and often shakes and stutters before turning off as if it was stalling. The mods That I have that could affect this are higher flow injectors an intake and electric fan conversion. I am relatively knew to the Volvo platform so explain things in general terms before going down the rabbit hole of the different Volvo parts between years. Thanks.
 
If your injectors are leaking they could be dieseling. When you turn the key off, the spark will stop. I'm also suspicious why you'd need bigger injectors on a non turbo 240 with LH2.2 if your only other engine mod is an intake. You're probably running very rich.
 
get your wiring schematic and look at what's connected downstream of the ignition switch (and what changes based on state).

Combustion needs fuel, air, spark. No spark = no bang, no fuel = no bang, no air = no bang. Check what feeds the system and what isn't stopping.
 
OP as has been noted above.... If with the key off it still gets power to ignition or injectors that needs to be solved.

Injectors can leak but rarely all four at once.

A fuel pressure regulator can leak via the vacuum signal to the intake which will make it diesel after being turned off.

Also.... if there is enough gasoline in the crankcase it will continue to run on crankcase vapors.
 
JohnLane said:
OP as has been noted above.... If with the key off it still gets power to ignition or injectors that needs to be solved.

Injectors can leak but rarely all four at once.

A fuel pressure regulator can leak via the vacuum signal to the intake which will make it diesel after being turned off.

Also.... if there is enough gasoline in the crankcase it will continue to run on crankcase vapors.
Click to expand...
It’s not exactly still getting power it just turns over a few times after the ignition as been cut but it’s more of an aggressive stutter than it idling normally. I’m gonna look into the injectors leaking since I just installed new ones I wouldn’t doubt that they could be leaking. Also the fuel pressure regulator I will definitely check that. Thanks
 
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