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

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

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

'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!

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