The Toyota Landcruiser Owners Club

j0mpst0rt · * Joined: 05 Aug 2007 Posts: 27 Location: Croydon, London

Car: VZJ95 3.4 5VZ-FE. - I was driving a long and heard a knock like a bang. I then try to accelerate but find I cannot go above 3k revs with what seems like some form of "throttle" i,e, i cannot accelerate unless i take the foot off the accelerator and then wait and put it back on again softly.

I looked at the engine, but couldn't see anything wrong.

This happened when I first bought the car too, but it suddenly went away.

What could the problem be please?

MIke

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DaveB · * Joined: 01 Mar 2005 Posts: 24

Is the ECU light on??

Sounds a bit like the ECU has gone into safe mode which limits the amount of revs you can ask of the engine.

Was the knock a backfire??

If the ECU has gone into safe mode, there is a fuse under the bonnet in the fusebox that says ECU. Remove it for 5 seconds, replace and start the engine, it will run like a stricken pig until the ECU re-maps itself to the engine, but gradually it will get better.

j0mpst0rt · * Joined: 05 Aug 2007 Posts: 27 Location: Croydon, London

The ECU light is not on, i don't even know whether the ecu light actually works.

How would I know whether it was a backfire? it sounded like it came from the front, not the back. Don't know what the cause of the backfire would be?

The sound of the bang was like a big stone hitting the side of the car (would that be a backfire)?

Keep in mind my car is only LPG.

Mike.

smudge · ** Joined: 17 Oct 2006 Posts: 106 Location: North Wales

DaveB · * Joined: 01 Mar 2005 Posts: 24

I think Smudge has got it, single point LPG systems are prone to causing backfires.

No ECU light eh?

When u switch on ignition its usually amber with like an engine symbol in the middle, goes off after starting.

j0mpst0rt · * Joined: 05 Aug 2007 Posts: 27 Location: Croydon, London

Ok,

Now to see what an inlet pipe looks like and where it is.

Yes, the light does come on and go off after starting.

So now, i have an LPG Service, and inlet thingy to repair, and all round brakes to be done and brake oil to be replaced, and backfire valves. Wonder what else this car will cost me? I'm in croydon, Surrey, anybody got any recommendations on who/where to go in Croydon, Surrey?? Otherwise, i'm going to send it off to the company in Wisbech, Norfolk who installed it in the first place.

I did get 194MPG from 58litres of LPG day before yesterday. Hope that's enough.

The brake oil is separating so i know that has to be changed, and the transmission oil and the power steering oil.

DaveB · * Joined: 01 Mar 2005 Posts: 24

j0mpst0rt · * Joined: 05 Aug 2007 Posts: 27 Location: Croydon, London

Is that normal, 300 miles for 60 litres?

I'm half a mind at the mo, to ask if my car can be switched over to multipoint, as I know there's currently a problem with the LPG (it doesn't start without ezstart first thing in morning). I've got two tanks (70 litre and 30 litre)underneath, so if its just an solenoid/vaporiser/mixer/injector change, would that be economical to do it on this car?

Previously there had been ( i can only assume before I bought it) there had been a bad backfire, cos the air box is broken and there's a burnt out bit of fibre on the underside of the bonnet where the air box is located?

Other than that, i cannot find anything else wrong...

DaveB · * Joined: 01 Mar 2005 Posts: 24

The Doc · * Joined: 01 Dec 2006 Posts: 46 Location: North London

If you're looking for an LPG specialist in south london try Battersea Autogas. They're on the web. Had my 3.4 fitted with a multipoint PRINS system by them a month ago and it's running a dream. 63L gets me 200 miles round london (stop start, winter driving). Am taking it on a run tomorrow, but expecting over 300 on the motorway.

My old Rangie ran a singlepoint system and would freqently backfire. Never seemed to do it any harm tho'..

It also had rubbish fuel consumption. Multipoint definitely the way forward. the 3.4 actually feels faster than when running on petrol.

j0mpst0rt · * Joined: 05 Aug 2007 Posts: 27 Location: Croydon, London

hmm, that's almost identical to my motorway driving, 195 for 58l,

you have a multipoint? in which 3.4 engine? 5VZ-FE? what did u pay for the install? if u don't want to say here, send me an email to j0mpst0rt@yahoo.com.

Battersea are concerned about my car repair, cos they are not sure how to get it started without petrol.

otherwise, its going to be yorkshire autogas who have already quoted a keen price.

The Doc · * Joined: 01 Dec 2006 Posts: 46 Location: North London

Have already posted details of the conversion in the 90 forum a few weeks ago. Mine is a 2001 3.4 VX, and runs on petrol too. The conversion was expensive - £2295 all in, but I went for a PRINS vsi multipoint which is pretty much the best system available. They replaced the petrol tank with a smaller one (42L) and a further 80L LPG tank, both underslung. The price included a flashlube system, pick up/delivery and a tank of gas. The PRINS system is set up to start the engine on petrol and then flicks over automatically when the engine reaches 32C. I don't know whether it can be set up to run only on gas. Multipoints are alot more expensive than singlepoints because of the ECU and the cost of the injectors. Having run both systems, there's no comparison - you get what you pay for.

j0mpst0rt · * Joined: 05 Aug 2007 Posts: 27 Location: Croydon, London

Conversation with mechanic....

Mate your pipes are not connected... Here... You here that wind sound, that's cos your sucking in air somewhere. So he fumbled around for about 2 minutes, found a cable and plugged it into a white thing looked like the top of a white hard metal/ceramic looking thing. The air sucking sound disappeared immediately, the engine calmed down, and engine went the quietest it has ever.

He told me not to bother with the compression test and won't bother taking yer money. Trust me mate, i'm not going to take your money, you don't have a problem with that lump.

I've disconnected the black cable from the battery and left it disconnected overnight. However, the car still will not accelarate beyond 2.5k revs. I have to be softly softly on the pedal.

The good side. This morning i started the car without ezstart for the first time in 4 months. And no LPG smell.

Any ideas on the accelaration side?

Mechanic now is quoting me to bleed and replace brakes, and to replace air box.

olivergt · Posted: Wed Jan 09, 2008 17:03 Post subject:

Keep plugging away, sounds like you are finally getting somewhere.

As for the acceleration above 2.5k, have you checked the Spark Plugs? if it wasn't running the correct LPG mix (with all that Air etc) they may have got a little out of sorts.

Or you could try the Italian Tune Up (Blast down the MWAY at max RPM for 15 minutes), this is not for the faint hearted though! And make sure the engine/oil is nice and warm before attempting!

Oliver

j0mpst0rt · * Joined: 05 Aug 2007 Posts: 27 Location: Croydon, London

Hiya, Oliver, thanks for your comments.

The Acceleration issue is now getting worse. I now cannot seem to get above 2k without the "cut out". It's getting above 2k and then i have the sudden drop in power again I have to take the foot off the accelarator, otherwise, it will stall. When i accelarate with the car in neutral, it accelerates fine. i don't know if that helps at all. Anyone got any ideas?

The car now starts absolutely fine. Although now I have to make sure I don't use the accelrator, otherwise the LPG backfires, but that's a known issue.

I'll have a look under the car at the exhaust next see if anythings off there.

Mike.