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No boost

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.
1975 - 1993 240
1983 - 1992 740
1982 - 1991 760
1986 - 1991 780
1990 - 1998 940
1990 - 1998 960
1997 - 1998 V90/S90
Johnny91
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Year and Model: 1989 740
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Johnny91

No boost

Post by Johnny91 » Thu Feb 21, 2019 11:36 pm

Soo I noticed the other day a lack of power and my boost gauge needle only goes about a quarter inch into the yellow now whereas before it would go into the middle. I checked the valve that bolts onto the turbo and it doesn't hold pressure- not even the pressure you would use to blow bubbles with. Could that have something to do with the lack of power?? I hope not because there doesnt seem to be a replacement available for such a part unless you buy it with a slightly more expensive turbocharger attached to it. :shock: where do the people who sell remanned turbos get them? :lol: Am i supposed to be asking these questions?



tardcart
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Joined: Fri Feb 08, 2019 4:17 pm
Year and Model: 96 850t. 93 940t
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tardcart

Re: No boost

Post by tardcart » Fri Feb 22, 2019 11:59 am

You need a bypass valve diaphragm for the td03 or 4. If you look around you cn find one cheaper (not from volvo) bit IPDs is 25 plus ship. rumored to rot after 3 years.
https://www.ipdusa.com/products/11813/1 ... pass-valve



Johnny91
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Johnny91

Re: No boost

Post by Johnny91 » Fri Feb 22, 2019 8:48 pm

I dont think my valve can be disassembled. When you take it off its sort of a piston that slides into the turbo but it looks like I would have to do some cutting to open it.



tardcart
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tardcart

Re: No boost

Post by tardcart » Sat Feb 23, 2019 6:24 am

oh, sorry I thought it was the Mitsubishi.



Johnny91
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Johnny91

Re: No boost

Post by Johnny91 » Sat Feb 23, 2019 9:52 pm

Naw you showed me a valve that I haven't seen. It is a Mitsubishi it's just that theres at least 3 Mitsubishi models



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RickHaleParker
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RickHaleParker

Re: No boost

Post by RickHaleParker » Sat Feb 23, 2019 11:40 pm

Looks like there where 5 different turbochargers for the 1989 740 with a B230FT. Two Garret and three Mitsubishi. Which one do you have?

These are all Full HD pictures, click on them to zoom in. The part number of the turbo you are viewing shows in red.
2019-02-24.png
2019-02-24 (1).png
2019-02-24 (2).png
2019-02-24 (3).png
2019-02-24 (4).png


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

tardcart
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tardcart

Re: No boost

Post by tardcart » Sun Feb 24, 2019 7:14 am

great interactive diagrams. I would be thinking about swapping in another compressor housing from the newer TDO4-13 on the 940
and many others with same size turbine, or swap in a complete 15g from an 850 v70 s60 for more boost. However this might not be the only problem with your turbo, even with a leaking diaphragm the bypass spring should keep it closed for maby 5lbs boost. The seal area doesn't rip I think. You just dont have the manifold boost pressure pushing on the diaphragm helping the spring to seal the bypass.



Johnny91
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Johnny91

Re: No boost

Post by Johnny91 » Mon Feb 25, 2019 11:31 pm

Mine is the 1389645. I can tell by the funny shape of the diverter valve there



Johnny91
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Johnny91

Re: No boost

Post by Johnny91 » Mon Feb 25, 2019 11:31 pm

Thanks by the way that looks like a dealers diagram



Johnny91
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Johnny91

Re: No boost

Post by Johnny91 » Mon Feb 25, 2019 11:33 pm

Tardcart so you suspect I have a boost leak?



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