1989 BMW E32 730i help needed

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Gilbertd
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Re: 1989 BMW E32 730i help needed

#21 Post by Gilbertd » Wed Jun 17, 2020 9:43 am

Cheap, readily available and with the correct thread to screw into the boss in the downpipe. Any 0-1V sensor will work but having had the cheap generic ones fail regularly and having to solder them in, I went for an NTK (lambda sensor division of NGK) that was one of the cheaper ones (due to the quantity being sold) that I could just plug in.
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Re: 1989 BMW E32 730i help needed

#22 Post by LPGC » Wed Jun 17, 2020 10:44 am

The other day I fitted a Chevy 0>1v sensor on my Nissan. I'd ordered the Chevy sensor to fit on a customer Chevy but when it got close to the date of the customer appointment and it still hadn't arrived I bought another one from a local dealer, this one arrived the day after I'd fitted the one from the dealer so I ended up having this one left on shelf which is why I ended up fitting it on the Nissan. I just cut the plugs off both sensors and soldered the Nissan plug onto the Chevy sensor.

Still a bit of a pain to change the sensor on the Nissan due to access, some mechanics lower the engine to do it, I removed the inlet manifold.
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Mouse
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Re: 1989 BMW E32 730i help needed

#23 Post by Mouse » Wed Jun 17, 2020 11:43 pm

I didn't think lambdas would be interchangeable like that. Good to know. I might give a scoot around a few scrappys I know and will help to keep the costs down.

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Re: 1989 BMW E32 730i help needed

#24 Post by Brian_H » Thu Jun 18, 2020 9:39 am

Some you buy come with no plug at all, you cut the old plug off the original sensor and use a piece in the kit to rejoin the wires from the new sensor to the old plug. Which is fine as long as the plug is ok of course.

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Re: 1989 BMW E32 730i help needed

#25 Post by Mouse » Thu Aug 27, 2020 1:16 pm

Well, it's coming to crunch time. I mentioned a bit back that the car won't be on the road until October, so with one thing and another, including the long finger, I still have not done any work regarding LPG on the car.

I had decided to go with the single point system, however, in a passing conversation yesterday with someone about the car and it's conversion to gas, they sent me a link to a used multipoint kit that got me reconsidering my choice. It's an OMVL Dream XXL system.

https://www.gumtree.com/p/car-replaceme ... 1382288970

In fairness, it does seem like good value, but would it do what I want, considering that the seller mentions it was on a 520i and it didn't work correctly?

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Re: 1989 BMW E32 730i help needed

#26 Post by Gilbertd » Thu Aug 27, 2020 2:15 pm

Looks like it will do the job, although it might be worth swapping the 2 x 8 injector blocks for a pair of 2 x 3 way blocks. It's cheap enough but bear in mind that you will need to buy a few hoses, clips, etc and a tank would probably be a good idea too.
96 Saab 900XS, AEB Leo, sold
93 Range Rover 4.2LSE, Lovato LovEco, sold
97 Range Rover 4.0SE, multipoint, sold
98 Ex-Police Range Rover 4.0, AEB Leo, daily motor
96 Range Rover 4.6HSE Ascot, AEB Leo, my spare


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Mouse
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Re: 1989 BMW E32 730i help needed

#27 Post by Mouse » Thu Aug 27, 2020 5:48 pm

Lol. Yeah, a tank would help to move the car alright. The hose clamps and stuff, I'd have to buy anyway, along with a tank. I'm probably better off not having seen that ad, as it made me think twice now.

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Re: 1989 BMW E32 730i help needed

#28 Post by LPGC » Fri Aug 28, 2020 4:03 pm

TBH on this install the 2 x 4 OMVL SL injectors will be fine, if it was a later straight 6 engine'd 7 series there probably wouldn't be enough space between where the injectors need to sit on top of the engine for the bonnet to close but on this older 7 series there will.

Did we find out if the car has a lambda sensor? If it doesn't it will be a pain to calibrate.
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Re: 1989 BMW E32 730i help needed

#29 Post by Mouse » Sun Aug 30, 2020 2:30 pm

No. It doesn't have a lambda sensor, but I am going to fit one to it. That will work, won't it?

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Re: 1989 BMW E32 730i help needed

#30 Post by LPGC » Sun Aug 30, 2020 3:47 pm

Mouse wrote:
Sun Aug 30, 2020 2:30 pm
No. It doesn't have a lambda sensor, but I am going to fit one to it. That will work, won't it?
Only if the petrol ECU can be made to work closed loop and is wired to do so.

If that isn't the case the lambda sensor won't help fuelling on LPG but will still be useful when you attempt to calibrate it.

The LPG system you've bought is incapable of reacting to lambda readings itself, as are most sequential LPG ECU's. For closed loop operation they rely on petrol ECU closed loop functionality.

If you intend on fitting a lambda sensor because you want the system to keep mixture correct and want an easy setup but then cannot get the petrol ECU to react to lambda readings (enable petrol closed loop operation) you might have been better off fitting a single point mixer closed loop system on it.
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Mouse
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Re: 1989 BMW E32 730i help needed

#31 Post by Mouse » Sun Aug 30, 2020 3:53 pm

Hmmm. I don't know if it can be made to work in a closed loop system. It's an old injection system, so I'm not sure.

What way will it run if it can't be made to work in a closed loop, or what way will the problems manifest themselves?

I haven't bought that kit yet.

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Re: 1989 BMW E32 730i help needed

#32 Post by LPGC » Sun Aug 30, 2020 3:59 pm

In my last post I presumed you'd bought the OMVL Dream system.

If you buy a closed loop mixer system, yes, connecting the lambda sensor to the gas ECU will work.

Now it's clear the original car doesn't have a lambda sensor and you haven't bought any bits yet - Buy a closed loop mixer system, not the OMVL Dream system.
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Re: 1989 BMW E32 730i help needed

#33 Post by Mouse » Sun Aug 30, 2020 5:10 pm

No. I hadn't bought it yet. I said I'd ask here first to make sure.

Right. I'll stick with the original plan

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Re: 1989 BMW E32 730i help needed

#34 Post by Budgetbond » Tue Sep 01, 2020 1:15 am

V tasty looking Bmw that Mouse great condition in one of the best colours can't be too many like it still about good find pal.

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Re: 1989 BMW E32 730i help needed

#35 Post by Mouse » Tue Sep 01, 2020 11:24 am

Thanks. Big old barges like them are getting more and more rare.

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Re: 1989 BMW E32 730i help needed

#36 Post by Budgetbond » Tue Sep 01, 2020 12:13 pm

Yeah nice purchase and find that mouse, better looking than its predecessor e23 and equivalent mercs, 5 series of that era are well regarded too aren't they.

What s the auto in it, I know on my e24 6 series that was there achiles heel?

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Re: 1989 BMW E32 730i help needed

#37 Post by Mouse » Wed Sep 02, 2020 9:22 pm

It's perfect. 145,000 miles, but drives lovely. The gearboxes can give trouble, but like any car, once it has been looked after, it stands to it later in life. Also, a car like this isn't generally one that gets abuse. It's used to waft about in, not to race. Overall, there's not a lot that goes wrong in them, with the caveat that it's 30 years old, and electrics and things can start to break down.
The E34 is like a small version of the E32, and prices are starting to rise on them. The E30 prices have been on the rise for a while, but you'll still get good value on an E34. They were very built cars, unlike the BMW's of today.

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Re: 1989 BMW E32 730i help needed

#38 Post by Budgetbond » Thu Sep 03, 2020 12:16 am

It sounds and looks luvly, I really liked that shape of 7 series, 145k sounds nicely used with plenty of life left in it.
I was gutted when I had to get rid of my 6 series, was a later one had been partly restored by a friend and was pretty rust free cept the fuel tank filler in the nice metallic blue with bbs alloys.
I remember it had motronic 1.3 and some of th electrics were starting to struggle on them, it had an early diagnostic port in the engine bay and if u paper clipped two pins it would start up if ever it was struggling.
And yeah the equivalent 5 series look pretty robust too.
Yeah I do believe some of the newer bm ' s aren't as well built what's that down to cheaper components, more complexity, cheaper mateials, made to break, not as good on the inside as the outside?

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Re: 1989 BMW E32 730i help needed

#39 Post by LPGC » Thu Sep 03, 2020 10:05 am

Around 10 years ago I owned 2 x BMW750 V12s on this shape.
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Re: 1989 BMW E32 730i help needed

#40 Post by Mouse » Thu Sep 03, 2020 8:45 pm

Well any man can have one :)

V12's were some serious machine. A real monster on the road, expecially compared to the 735.

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