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What injector do I buy?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

anthonytsi
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anthonytsi

What injector do I buy?

Post by anthonytsi » Mon Jul 08, 2019 4:35 pm

I have a 1996 Volvo 850 Turbo Platinum wagon, engine code B5234t. When I go to FCP Euro I have two choices for injectors. One that is for vehicles with a fuel return line and one without. The ones on my car look like the fatter of the two and it is for non-return line cars. However, I do have a fuel line into the rail and one that comes off of the regulator and runs parallel to the other line. I am confused. Please help.



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tardcart

Re: What injector do I buy?

Post by tardcart » Mon Jul 08, 2019 5:00 pm

all the turbos are the same. return line off the pressure damper. why are you getting new ones?



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erikv11
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erikv11

Re: What injector do I buy?

Post by erikv11 » Mon Jul 08, 2019 5:15 pm

Don't worry about return or non-return fuel line setups, that is not going to matter at all here.

The fat ones (https://www.fcpeuro.com/products/volvo- ... -852-12142) are near-exact replacement for the orange injectors that came with your car originally.

The skinny ones (https://www.fcpeuro.com/products/volvo- ... -852-12163) originally shipped with 1997-98 LPT engines, they are called red injectors. The reds are the same flow rate cc/min as the orange ones so presumably they will work just fine in your HPT. I've never used them in a HPT engine but likely someone has, though I recently asked about that and no one volunteered that they have used them.

How many are you buying, a full set or just a replacement? Another great option is to get yours cleaned, flow tested and rebuilt by a service, will run you about $100 for the set and I would have 100% confidence in that route. If you just want a couple used orange injectors I'd recommend the junkyard or I can send you some for a few bucks each.


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

anthonytsi
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anthonytsi

Re: What injector do I buy?

Post by anthonytsi » Tue Jul 09, 2019 4:04 pm

tardcart wrote:
Mon Jul 08, 2019 5:00 pm
all the turbos are the same. return line off the pressure damper. why are you getting new ones?
Misfire on cylinder 4 before and after a tune-up.



anthonytsi
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anthonytsi

Re: What injector do I buy?

Post by anthonytsi » Tue Jul 09, 2019 4:05 pm

erikv11 wrote:
Mon Jul 08, 2019 5:15 pm
Don't worry about return or non-return fuel line setups, that is not going to matter at all here.

The fat ones (https://www.fcpeuro.com/products/volvo- ... -852-12142) are near-exact replacement for the orange injectors that came with your car originally.

The skinny ones (https://www.fcpeuro.com/products/volvo- ... -852-12163) originally shipped with 1997-98 LPT engines, they are called red injectors. The reds are the same flow rate cc/min as the orange ones so presumably they will work just fine in your HPT. I've never used them in a HPT engine but likely someone has, though I recently asked about that and no one volunteered that they have used them.

How many are you buying, a full set or just a replacement? Another great option is to get yours cleaned, flow tested and rebuilt by a service, will run you about $100 for the set and I would have 100% confidence in that route. If you just want a couple used orange injectors I'd recommend the junkyard or I can send you some for a few bucks each.
Thanks for the advice and the offer.



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tardcart

Re: What injector do I buy?

Post by tardcart » Tue Jul 09, 2019 6:38 pm

Its rarely the injector. You could swap it to another cylinder and see if the code changes to that. Volvo uses a inexact batch fire that
sort of equalizes out in the plenum to produce 14% fuel to air. check the routing and pinching and age of the HT wires including the coil.
if you are dead set on a new one just buy one the same color.



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erikv11

Re: What injector do I buy?

Post by erikv11 » Tue Jul 09, 2019 7:54 pm

tardcart wrote:
Tue Jul 09, 2019 6:38 pm
... Volvo uses a inexact batch fire that sort of equalizes out in the plenum to produce 14% fuel to air. ...
I'll have to remember to call on your for backup the next time I am trying to explain to some (or is it only one?) of our most prominent MVS members that (1) batch fuel injection is a real thing and (2) it is what the Motronic 4.3 and 4.4 engine management systems use.


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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abscate

Re: What injector do I buy?

Post by abscate » Wed Jul 10, 2019 6:48 am

My ME7 reports two injector durations but my sharp eyes have noticed they are identical in length and track each other exactly

I’ve assumed ME7 fires a single pulse length to all 5 - is that the understanding here on earlier systems too?


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erikv11
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erikv11

Re: What injector do I buy?

Post by erikv11 » Wed Jul 10, 2019 7:51 am

That is my understanding, yes.


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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