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Bad fuel consumption b200ft help needed

J

justsproti

New member
Joined
Jul 10, 2024
Hey, I'm fighting since 10 months with my b200 ft in 940 wagon 1996. It takes ~15-16L/100km... 0 different between city or highway... Lambda light was on, I connected the diagnostic computer and it showed me some error about MAF. I replaced it, error is gone but fuel consumption is still bad. I changed an oxygen sensor and MAF again, still nothing has changed. Maybe fuel regulator valve? Nothing changes when I'm unplugging the hose from it and I have about 4+ bar on iddle and ~5 when I'm revving up
Help plz coz my wallet is crying xd
 

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Well if you have four bar of fuel pressure at idle. Your fuel pressure regulator is bad. It's a 3 bar regulator at least on the US models and I would think the same regulator pressure is on yours. So, that's one thing. I think you may also have another issue with the engine coolant temp sensor so that is worth checking out. As mentioned above you probably ruined the catalytic converter.
 
dl242gt said:
Well if you have four bar of fuel pressure at idle. Your fuel pressure regulator is bad. It's a 3 bar regulator at least on the US models and I would think the same regulator pressure is on yours. So, that's one thing. I think you may also have another issue with the engine coolant temp sensor so that is worth checking out. As mentioned above you probably ruined the catalytic converter.
Click to expand...
does a B200 use a different regular ? maybe needs more pressure
 
dl242gt said:
It's a turbo engine so I wouldn't think the regulator would be any different than the US models which are 3bar.
Click to expand...
Ive used 3.5 bar ones with little or no issues. I agree OP probably has a bad fpr, but euro specs might be high comp engines with commie gas regulations etc etc.

OP, What's the part no on the fpr you have now?

How do the plugs look, and how many miles on them?
 
dl242gt said:
Well if you have four bar of fuel pressure at idle. Your fuel pressure regulator is bad. It's a 3 bar regulator at least on the US models and I would think the same regulator pressure is on yours. So, that's one thing. I think you may also have another issue with the engine coolant temp sensor so that is worth checking out. As mentioned above you probably ruined the catalytic converter.
Click to expand...
Cat is cut out, turbo is red when I'm driving faster than usual
 
The 700/900 pocket data book says that the B200FT FPR is the same as the normal B230 FPRs: 3.0bar

The 3 bars is the pressure above the intake manifold pressure, where the hose connects. This means that at idle, when there's a manifold vacuum, the fuel pressure should be ~2.3bars due to 0.7bar idle vacuum. At 7psi or 0.5bar boost, pressure should be 3.5bars.

If you have a handheld vacuum pump (often for brake bleeding), you can connect it to the vacuum line and should be able to watch the pressure drop as you vacuum down the line. You can also check you fuel pressure gauge against a bicycle pump's gauge if you can figure out how to splice the lines together.
 
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