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1990 Renix Volvo/Bosch 19# 280-155-746 injector swap

Old 02-22-2013, 07:41 PM
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Default 1990 Renix. Volvo/Bosch 19# 280-155-746 injector swap

THESE WOULD BE FOR 87-90 RENIX JEEPS ONLY

4.0 Auto. I swapped the stock Simmons Deka to Bosch # 280 155 703, 23 Lb/Hr. injectors last year. Supper. About 18 hwy. MPG at 270,000 miles!.

But!, however long it's too cold to go into "closed loop", 23 Lbs/hr is too much fuel at a "default pulse width", set for 18.6 Lbs/hr. I'm gettin' about 13 MPG doing allot of 25 mile trips. Being rich won't help it warm up any faster. (evaporating liquid sucks up heat).

So. (on a tip from our most popular injector vender), I found that the Bosch # 280 155 746 #19 Lb, (with the clip slot, (unlike the 700's)), are plug and play, and at the moment seem golden. It idles and runs smooth as ever!

I might be biased, but they might feel better than the 703's. I did an acceleration test before I pulled the 703's, floored it for 10 seconds at 30 mph on steep hill. Hit 35. Same spot, same hill, with the 746's, I actually saw 36 MPH. So test error? Anyway I doubt they are worse.

So now I'm gonna' run a couple of tanks, (filling the same way, parked in the same spot, at the same Shell pump), and see if that 13 MPG improves with the 746's. Then I will swap in the OEM T-stat.

Added>> The relatively new t-stat does hold 195*, checked with a probe, but Cruiser says the OEM T-stat will get there faster, and it goes to closed loop quickly. Also 5-90 posted the heated "HEGO" 02 sensor will put it in closed loop pretty quick anyway. So my thanks to you both, (hope I got that right). I'll post what I see. 13 MPG leaves plenty of room for improvement!

I get just over 16 ohm's from both the Siemens and the 746, 12.2 on the 703's.

My thanks to Ebay vendor zipaquio for a supper deal. Yea, two of six were "sticky" but hey, used "as is", and they freed up. http://www.ebay.com/itm/281064226718?ssPageName=STRK:MEWNX:IT&_trksid=p398 4.m1439.l2649

OK the above link is dead. was $36 IIRC for my set..
Attached Thumbnails 1990 Renix Volvo/Bosch 19# 280-155-746 injector swap-102_0288.jpg   1990 Renix Volvo/Bosch 19# 280-155-746 injector swap-102_0287.jpg  

Last edited by DFlintstone; 08-03-2016 at 02:45 AM. Reason: OK the above link is dead
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Old 02-23-2013, 10:47 AM
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Your injector harness clips are falling off.

FYI Flintstone. factory stat 83501426AC:

28* ambient temp. Within 5 minutes of driving and 2 miles travelled on flat road, my coolant temp was at 195*.
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Old 02-23-2013, 01:10 PM
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Originally Posted by cruiser54 View Post
Your injector harness clips are falling off.

FYI Flintstone. factory stat 83501426AC:

28* ambient temp. Within 5 minutes of driving and 2 miles travelled on flat road, my coolant temp was at 195*.
*They just aren't on yet. Clouds and rain blowing in, (got the photo though!).

*The one they had for me was c, 83501426AD It's 195* It has a tiny check valve to let air through. (to be mounted at 12:00) ($22.75)

*I'm not heating that fast. Also my first 3 miles descend 1,500 feet. (pretty steep gravel)

You missed something. Wheres Waldo?

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Old 02-23-2013, 03:02 PM
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Originally Posted by DFlintstone View Post
*They just aren't on yet. Clouds and rain blowing in, (got the photo though!).

*The one they had for me was c, 83501426AD It's 195* It has a tiny check valve to let air through. (to be mounted at 12:00) ($22.75)

*I'm not heating that fast. Also my first 3 miles descend 1,500 feet. (pretty steep gravel)

You missed something. Wheres Waldo?
I saw the hokey CCV set-up..........Waldo.
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Old 02-23-2013, 03:20 PM
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Map tube!
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Old 02-23-2013, 03:26 PM
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What is up with that CCV setup?
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Old 02-23-2013, 03:33 PM
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Originally Posted by DFlintstone View Post
Map tube!
Oh. Did you do it like mine?
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Old 02-23-2013, 10:23 PM
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Originally Posted by cruiser54 View Post
Oh. Did you do it like mine?
Not yet. I managed to put all the little pieces sort of back together again. PNW, the CCV vent goes to the air cleaner.
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Old 02-24-2013, 11:27 AM
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Just ordered a set of injectors from zipaquio on eBay then popped over to Bonanza.com and ordered new caps & o-rings set.
http://www.bonanza.com/listings/BOSC...FYKDQgodAy0Atg
(I assume this is the right set?)

Thanks for being the guinea pig and lettting the rest of us in on this mod.
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Old 02-24-2013, 12:44 PM
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Originally Posted by Nick-B View Post
Thanks for being the guinea pig and letting the rest of us in on this mod.
Guess if you bought 746's we have two guinea pigs! (for 746's in RENIX ONLY!)

Yesterday a buddy who drives for me sometimes said he thought the Jeep ran smoother as well. It'll be a good while before I can take a stab at figuring mileage.

I'm no expert but that set looks fine. I didn't even take mine apart, don't know how!

Last edited by DFlintstone; 02-26-2013 at 08:40 PM. Reason: set
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Old 02-24-2013, 10:54 PM
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028 150 943 Might be 19 Lbs/Hr. There are "clip nut" slots. They are 14 ohm, stock is 16.

Bingo. Here it is. Bosch injector flow rates.

Divide CC's by (about)10.5 to get Lbs.
http://www.polog40.co.uk/article_injector_table.php

Last edited by DFlintstone; 03-13-2013 at 12:31 AM. Reason: Bunch of corrections
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Old 02-25-2013, 10:02 AM
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Any update on your fuel mileage ?
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Old 02-25-2013, 11:55 AM
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"don't get around much any more" was a song lyric. Nope! In 70 miles it went from pegged down to the full mark is all I've got. Trying to earn $ for property tax from people saving there $ for property tax sucks! Work will pick up.
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Old 02-26-2013, 07:15 PM
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105 miles, and a bit over 3/4 tank. MAN! I gotta say. Smooth as warm butter. My job today was a ways up a winding highway along the Smith River. It really feels great. I'm about to see if I can balance a nickel on the valve cover!

I'm waiting to see the actual mileage before I suggest everyone with a Renix consider trying them, but shoot, those of you who went to 703 and said "Wow", there is yet another "Wow" out there!

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Old 02-26-2013, 08:01 PM
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Hmm which wow... Should I do...
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