fuel problem it want to go but then lack of power, then power then no more power
same thing over and over 94 940 can any body HELP???

 

I split this off to a new thread, as its a different car, with probably a different problem.

 

there's way insufficient information to diagnose this without seeing the car and running some tests. I dunno where I'd start.

Why do you think this is a fuel problem? it could be an ignition problem too. does it stall entirely, or just stutter and lose power ?

IF its a fuel problem... wait, a 1994 940 can have several different fuel systems... it could be a regina/rex non-turbo, a Bosch non-turbo, or a Bosch turbo. It even could be the 16V twin-cam variant, which was also Bosch. There were also B230FD 'pulse-air' engines that vintage. each of these systems has its own quirks and features, so guesses as to whats wrong without even knowing what you got would be futile.

 

TY to everyone who tryed to help, but both pumps I have seems to work when I
turn the key on I here the one that is connected to the fuel filter and the other
one which is in the tank I open the gas cap and put my ear to it I heared the fuel pump
kicked on when the key just before you start the car comes on for 1 or 2 sec then it
stops so dose any one out there have any idea why the car still doesnt work when you step on gas peddle the car bogs down and then when you keep pressing it will work until you let go of gas peddle it does the same thing. The point is I give gas works the like before over and over PLEASE HELP ME TY

 

ok, after cranking the car a few times, and having it not start.....

wait-a-minute... what car are we talking about here? the thread was about Jacob's 1990 240. What does Hodester have? so your car starts, but if you give it gas it bogs down? that sounds like a MAF problem, IF your car has one, since we don't know what it is, its hard to guess.

 

MAF is new. I have 1994 940 non turbo

 

so what exactly are the symptoms again? you said 'doesn't work', then it sounded like its starting and running, but bogging when you hit the gas pedal ? you said 'gas works like before', well, we have zero context on this, as this is your first post on this thread, which was about someone elses car.

actually, i'm going to merge this thread to your original one.

 

ok, a 1994 940 non-turbo could be a Bosch system, or it could be a Regina/Rex system. it also could be a B230F or a B230FD engine, the latter being 'pulse-air', and is distinguished by a odd 'F' shaped bunch of tubing and valves that goes over the top of the front of the head, and connects down to pipes near the exhaust manifolds.

you said you replaced the MAF, so its probably not a Regina, as they don't use an MAF. this new MAF, is it a Volvo 'blue box' part (genuine Volvo dealer part), or is it an aftermarket rebuilt part? the latter can be pretty sketchy as to quality, seen as many bad as good.

my next guess is going to be an issue with the air intake plumbing, an air leak between the MAF and the throttle body can cause the engine to grossly miscalculate how much fuel to inject.

 

could it be fuel pump relay? 1994 940 non turbo.when starting up runs fine then
lose power then power it does that all the time,new injectors (4) new fuel filter
I have no clue on what wrong with it

 

if the fuel relay fails, the car won't run at all. dead stop.

 

then what?

 

Just coming into this discussion cold, I would say that the first thing you need to do is verify constant fuel pressure. Connect a FP gauge to the fuel rail and verify 42-44psi with the engine idling. Fuel pressure should jump about 5psi when you snap the throttle. Once we know that fuel pressure is constant, even when the engine is losing power, we can rule out any fuel pump or pump control issue and focus on fuel management.

I am having a difficult time interpreting your text. I am not sure if you are saying that the engine runs okay when you step on the gas but surges when at idle. This would point to a lean idle condition, which could be caused by an inlet air leak, like a big hole in a hose somewhere, a ruptured brake booster diaphram, or a sucked in manifold gasket.

 

Some better grammar would be helpful... I cannot make any sense of some posts. But since this is an international forum, English is a problem, probably using computer translators...

 

better problem description. i can live with bad grammar although it annoys me when it comes from native speakers.

 

If it is not the MAF and there is no leak should I replace both fuel pumps?
1994 940 2.3 non turbo or just the high pressure pump next to the fuel filter or
just the low pressure in the tank? Thanks

 

I wouldn't replace any fuel pump without first testing it to see that its bad.

 

There are a bunch of other things that can be the cause. Fuel pump(s) is quite down the list...

Did you ever figure out if you got Bosch or Regina?

 

I have Bosch. Can you send me the list so I can check them off TY

 

sorry about the grammer! But do have a list of things I need to check?

 

See this, they explain it better than I ever would:
Engine Tune and Performance