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1999 s70 AWD “ the Kat” intermittent loss of power (fuel delivery, ETM ) Topic is solved

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1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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abscate
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1999 s70 AWD “ the Kat” intermittent loss of power (fuel delivery, ETM )

Post by abscate »

Took the Kat out for a final test drive before going to daughter and it lost power on the highway.

Crept home at 20 mph, little throttle response.

No ETS light but feels like limp mode.

Will check fuel pressure and throttle positions in the morning
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Post by abscate »

Fuel pressure check - showing high. Check took 10 minutes. No "Ive got fuel at the rail so I have fuel pressure" for me.

System stabilises about 70 psi after start. Fuel pressure develops slowly and bleeds quickly, but Im not sure bleed down spec is same for the AWD and FWD - they should not be as the fuel delivery system is completely different.

Confirmed gauge is ok with 50 psi reading on my ME7 1999 FWD

Car starts and drives well with good power this morning, this is pointing me to a Throttle body fault and limp explaining last night.
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Post by 454cid »

abscate wrote: 05 Jul 2022, 08:38 System stabilises about 70 psi after start. Fuel pressure develops slowly and bleeds quickly...
Isn't spec in the 40's or is that just the 850? Could you have a plugged return line.... assuming there is one. I know on my truck, I can hit 90psi really fast, if I plug the return line.
Car starts and drives well with good power this morning, this is pointing me to a Throttle body fault and limp explaining last night.
Is this a fly-by-wire system?
1996 Volvo 850

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Post by abscate »

It is indeed the first year of fly by wire.

I have a spare late model contactless Turbo ETB so I am getting close to pulling a swap.
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Post by foggydogg »

abscate wrote: 05 Jul 2022, 08:38 Fuel pressure check - showing high. Check took 10 minutes. No "Ive got fuel at the rail so I have fuel pressure" for me.

System stabilises about 70 psi after start. Fuel pressure develops slowly and bleeds quickly, but Im not sure bleed down spec is same for the AWD and FWD - they should not be as the fuel delivery system is completely different.

Confirmed gauge is ok with 50 psi reading on my ME7 1999 FWD

Car starts and drives well with good power this morning, this is pointing me to a Throttle body fault and limp explaining last night.
My spare modules are all pre-99.
69 1800s, @500k Death by Rust
94 850 Turbo, T-boned, ambulance for me, crusher for it
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98 V70R, Junkyard rescue
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Post by scot850 »

That fuel pressure is high. Mine read in the high 60's psi when the dealer checked it after replacing the fuel and ejector pump units on the '00 V70R. So it is possible it may be that high. Only other possibility is you pinched a pipe refitting the fuel tank. As delivery pressure is good it would have to be on the return you would think. The return pipe runs onto the top of the tank on the front RH corner and then run all the way around the top rear to the front LH of the tank and then the connector pipe between the 2 sides. That front pipe is the most likely if any are caught or an issue with the pressure valve.

I don't think this is the fuel system thought. Feels more like the ETM unfortunately. Did you clean this when re-freshing everything? If not maybe a good clean of the throttle assembly might be in order before panicking!

I have a turbo ETM (the spare for the 'R') but it was from an 'R' so not sure if it is compatible even for a trial basis.

Neil.
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Post by abscate »

Just took it for another slow speed spin around town and it drove for about 15 minutes, the limped, then came back

Very un-fuel pump like.

I’ve got a spare contactless turbo ETM, I’ll swap tomorrow
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Post by abscate »

Well, this one made a complete fool of me. I drove around town just fine, but highway brought the same limp mode, then stranded me 1 mile from home.

My Albany Angel bailed me out, and I had a rare flash of insight realizing I had not qualified the fuel storage system In the Kat yet.

Sure enough m 3 gallons in the RH saddle tank , and she roared to life.

Cylinder 2 is missing so I’ll sort plugs and coils in the am, just put in new plugs

At the fill station, she took 10 gallons over 200 miles city driving, so I’m not getting access to 8 gallons on the Lh tank

I have a nice new turbo ETM late model contactless though!
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Post by scot850 »

You may not be getting any fuel pressure into the LH tank to move the fuel to the RH tank. As mentioned before, you may have trapped the transfer pipe when refitting or kinked it?

Does your fuel gauge show the correct amount of fuel?

Neil
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Post by abscate »

I think that is what is happening, I doubt I kinked it, either the FPR isn’t FPRing or it’s plugged..

Ill live with it for now.

It was showing the correct amount based on the refill
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