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Volvo V70 Bi-fuel CNG help

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Old Jan 5th, 2014, 00:04   #1
charlidson
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Default Volvo V70 Bi-fuel CNG help

I have a V70 2006 Bi-fuel CNG . The car used to run 70% of the time on CNG but would typically switching to petrol just before the engine reached normal operating temperature. I have read numerous bloggs and post but found nothing that relates directly to CNG engines.
As I have now discovered, the Necam Voltec CNG system is very similar to the LPG system with a gas regulator rather than a vaporizer. The CNG has one advantage that it doesn't suffer from the same dirt and oil contamination most LPG users report since CNG is totally clean.

I eventually replaced the stepper motor and distributor but found the car would start up, switch to gas and then struggle to idle before dieing.

Any ideas most welcome!
Charlie
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Old Jan 5th, 2014, 00:46   #2
classicswede
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You might find that the replacement distributor is the wrong one. There are a few versions of the Necam distributor.

The CNG ones still need cleaning.

We have a forum member on here called CNGbifuel on here with a CNG V70
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Old Jan 5th, 2014, 20:55   #3
charlidson
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Default CNGbifuel

Thanks for your reply,
I checked the old and new distributor and they both have the same serial number prefix and are also visually identical.
Will check out CNGbifuel though.
Charlie
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Old Mar 16th, 2014, 17:56   #4
CNGBiFuel
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'tis I. I've a pile of bits that I've been collecting. I replied to your other post. I will admit here, I'm mystified. Nine times out of ten it'll be dirt in the dist and if you've let it go too far a new stepper.
I'm puzzled. PM me. And psot what it was if you sorted it. I had issues with the Lambda which gave similar issues.

Ouch! You've already spent real dough...

Edit: Didn't see you location at first, just looked up Dals Rostock - I had you as a Brit!
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Last edited by CNGBiFuel; Mar 16th, 2014 at 17:58.
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Old Apr 2nd, 2014, 13:10   #5
Lpgc
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Isn't CNG a bit hard to obtain in this country compared to easily obtainable LPG?

Unless you have your own CNG compressor and maybe a spinnable gas meter lol..

Simon
www.Lpgc.co.uk
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cng, necam koltec, problems, repair, v70 2006


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