Has anyone put an LH 2.2 fuel rail and FPR on an LH 2.4 car? Any reason not to do it?

The 2.2 FPR runs at ~.5 bar < the 2.4. that shouldn't be a problem for the system as

1. FCP Euro shows the same injector 1986-93
2. T don't think the computer regulates pressure electronically.
3, The fuel pumps, sender, lines are also the same

It would be a problem on a car with a cold-start valve if you used the earlier manifold - you'd need to replace the 561 with a 951 or add a resistor to the cold-start circuit (if I understand that correctly via posts here).

(Why? Because I have several spare 2.2 manifolds with rails, injectors, and FPRs.)
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240 drivers / parts cars - JH, Ohio

I'm unsure. I imagine it'd bolt in onto the cylinder head with the throttle body, yet the FPR placement and model and return fuel line routing. While FPR fitment is different, I *believe*, yet am unsure, the LH-2.2 FPR rates at the same vacuum line BAR negative pressure and response.

You do mean to keep the LH-2.4 on the LH 2.4 car, yes? Prevet, comrade.

A quick n' easy visual compare should compare out as the same vacuum line routing.

An LH 2.4 car with a ... 5xx supports a cold start valve (injector). The LH 9xx ECU does not support the cold start valve (injector) though it may be wire into the harness. At least as I've read. I'm unsure.

I have a 1990 (late 1989) with LH-2.4. It came with a 951 (or a white label 561 and I installed salvage yard 951 on a lark.)

http://www.nuceng.ca/bill/volvo/database/ecu.htm

I have a 1991 with the LH-2.4 w / EGR 556 gold label. So the LH and the EZK ECU are different. It has the 933 or 946 (?) in it, now.

I'd like to remove the EGR piping and the EGR ECUs to replace it with the LH-3.1 and non EGR EZK ECU.

Hope that helps you and your conversation here.

Questions?

Thanks,

Macbeth
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Give your brickboard.com a big thumbs up! Way up! - Roger Ebert.

Thanks for the comments.

Yes, it's a bolt-in swap with a slight mod to the routing of the return line.

The only problem I see is that the LH 2.4 is expecting more pressure.

I'll probably just swap one around and see what happens.
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240 drivers / parts cars - JH, Ohio

The 2.2 was a dog compared to the 2.4. I think it was down to the higher fuel pressure.

Why do you want to do this ?

Greg

...from my 1st post above

"(Why? Because I have several spare 2.2 manifolds with rails, injectors, and FPRs.)"
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240 drivers / parts cars - JH, Ohio

I believe, yet am unsure, that fuel pressure delivered by the main fuel pump is the same.

I dunno where the spec is. Though we can search fro it here on your brickboard.com. A schrader valve come mounted to the later 2.4 and 3.1 fuel rail. Some will use a tire pressure gauge to measure it.

A quick glance at parts listing suggest the same Bosch injector is used on LH 2.0 (or 2.2) and newer engines. I'll imagine you are working with normally aspirated engines?

The LH-Jet ECU controls injection volume by injector open duration as the fuel pressure remain consistent with exception of the vacuum controlled fuel rail fuel pressure regulator on Bosch LH-Jetronic.

And while the fitting is different as to how the FPR secures to the LH-Jet 2.2 versus the LH-Jet 2.4 / 3.1 and Motronic on 940, though I can't cite the resource now, the LH-Jetronic 2.2 FPR has the same effect on fuel rail (and injector) pressure as does the 2.4 for an engine vacuum effect on the vacuum controlled diaphragm inside an FPR.

The FPR can fail yet not leak: certainly if let to set for long periods with water in the line. Uncle Art B. has performed post-mortems on the Bosch FPRs demonstrating this.

Also, while futzing with the rubber fuel line, you may want to buy a new section of it between the FPR out to the steel fuel return line, if it appears old, brittle, cracked.

I guess you do not have salvage yards near with late 740 1988 model year or 1989 model year 240s? These may have what you need.

Row52, the Pick'n'Pull site to list salvage yard autos at Pick'n'Pull nationwide affiliated salvage yards do not show any RWD Volvos near you.

http://row52.com/Search/?Year=&V1=&V2=&V3=&V4=&V5=&V6=&V7=&V8=&V9=&V10=&V11=&V12=&V13=&V14=&V15=&V16=&V17=&LocationId=0&ZipCode=43740&Distance=50&MakeId=243&ModelId=&Page=1&IsVin=false

There is a 1993 240 at the Pick'n'Pull with 2.4-LH-Jet white label 561 ECU / EZK 116 no EGR. Fuel rail was still there when I got the 14" steelies off it 3-4 Saturdays ago.

Could have driven it out of the yard. So ticks me off to see a good Volvo automobile in a salvage yard for small failures caused by neglect.

Like to keep the Corona wheels to rehab them some day with small center caps. Oh well.

St. Louis sucks. What a hell hole. Least the frosty cold holds down the stench. Pollution held at at bay, sort of.

cheers,

dud.
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Give your brickboard.com a big thumbs up! Way up! - Roger Ebert.

I think that's correct: main fuel pump produces the same pressure 2.2 and 2.4. The 2.2 FPR is at a lower pressure so the pressure at the 2.2 injectors is .5 bar lower than the 2.4.

The spec is in Bentley.

I've not been to a junkyard for 240 parts. There are some in yards ~ 1.5 hours NE of me. But I have several 2.2 rails w/FPRs and I'd like to use them.

Thanks for the comments.

(I liked St Louis but it's been a long time.)

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240 drivers / parts cars - JH, Ohio