Topic: Jeep WJ Major Misfire (Read 15842 times)

Dutch · « **Reply #75 on:** November 02, 2012, 08:28:45 PM »

Quote from: jay140285 on November 02, 2012, 11:40:20 AM

Bubba mobile mechanics will be out this afternoon,

Tank's supplied the Frame.

GazJeep vehicle collection and delivery services is booked in to provide the tow rig as the Panzer is a weighty beast.

'Kinell you really called out the cavallery

jay140285 · « **Reply #76 on:** November 02, 2012, 08:35:42 PM »

That is what good mates do.

Update, after Kev spent a couple of hrs on it this afternoon it seems that:

No2 Valve is screwed, seems to have failed in the open position therefore letting gases escape causing the misfire on 1 and 2.

Compressions are from 145 - 150 psi, but on No2 psi reads 0.

So going to have to get in touch with the LPG installer as "Valve Saver" was installed for a reason.

Thanks for this afternoon Kev,

FYI he did need to stand on a spare tyre to reach the engine

Bulldog67 · « **Reply #77 on:** November 02, 2012, 08:58:18 PM »

I am beyond fucked off with reading bullshit like this

Dutch · « **Reply #78 on:** November 02, 2012, 09:08:47 PM »

Quote from: Bulldog67 on November 02, 2012, 08:58:18 PM

I am beyond fucked off with reading bullshit like this

explain ....

bigjeepzj · « **Reply #79 on:** November 02, 2012, 09:23:16 PM »

jay140285 · « **Reply #80 on:** November 02, 2012, 09:33:14 PM »

Anyway back on track, just emailed the installer and will report back once I hear back from him.

He is normally hot on the email, and I was in touch with him the week it went tits up as its due a service on the lpg in a 1000mile.

I have said that I have all the required gaskets (£400) if he had to get them from Jeep or a motor factors, I said that I will supply those to him.

Showing some consideration from my end early on.

MOCAJ · « **Reply #81 on:** November 02, 2012, 09:33:59 PM »

Ade

but i should ask everyone what flavour first

demonicwillow · « **Reply #82 on:** November 03, 2012, 09:31:54 AM »

The valve may have failed regardless of running on LPG or petrol, even with flashlube/valvelube/valvesaver fitted the V8 suffers badly from valve seat recession running on LPG ... the valves are made of extremely runny cheese and dont hold up too well from LPG which is a totally dry fuel, its octane rating is much higher then petrol and generates more heat within the combustion chamber, if one has suffered then get them all done, but dont be surprised if they fail again.

big g · « **Reply #83 on:** November 03, 2012, 10:29:54 AM »

The ol' I6 will drink any old shit,that v8,well,that's a bit more of a connoisseur :jpshakehead

Bubba · « **Reply #84 on:** November 03, 2012, 11:33:20 AM »

has to go back to installer in my mind

Bubba · « **Reply #85 on:** November 03, 2012, 12:00:58 PM »

i have a theory that the valve save fluid is not reaching the front cylinders

demonicwillow · « **Reply #86 on:** November 03, 2012, 01:06:56 PM »

what type of lpg system is it, single point, multipoint injection, sequential ??

Bubba · « **Reply #87 on:** November 03, 2012, 04:49:55 PM »

mulitpoint but saver fluid goes in to rear of throttle body does not seem to have any kind of vaporizer just drips in to the rear of body i wonder if it simply does not vaporize enough to get to front cylinders or even weather delivers enough fluid throttle body is to rear of inlet manifold

lpg and petrol are both delivered by injector to ports

i could be in the dark but thats what i was wondering

Panic mechanic! · « **Reply #88 on:** November 03, 2012, 05:45:22 PM »

to be honest most systems run that way, so I doubt it would make any difference, maybe the 4.7 is just one of those engines that can't deal with it.

has got me wondering tho if it would be easier to just add some lead replacement additive to the petrol so that when it starts it coats them?

jay140285 · « **Reply #89 on:** November 03, 2012, 06:41:12 PM »

I imagine I will get a reply off him on Monday, so will let you know what he says.

I was thinking that I one valve has failed what are the others going to be like.

Compression should be from 140 to 180 psi, mine are 145ish, so lower end of scale.

If this due to its age and miles 96k or could it be the others on their way out as well?

demonicwillow · « **Reply #90 on:** November 03, 2012, 06:56:14 PM »

As I said if one has failed then get them all checked and done VSR is a bugger with the V8's and will fail again after a rebuild, but should last a good while before vsr sets in again, if that is indeed what is wrong, but get it checked first with your lpg fitter hopefully he will get it sorted for you

... see here, this is quite a good guide for anyone wanting to fit an lpg system

http://www.amrautos.co.uk/database_problem_cars.pdf

Bubba · « **Reply #91 on:** November 04, 2012, 09:30:03 AM »

hmmm i seem to be very much out of my depth i gracefully decline to make my self look foolish and refer the problem on to my learned friend panic should the installer welch on the warranty ....................... i think he may need 3 wheels to stand on but heyhoo

jay140285 · « **Reply #92 on:** November 04, 2012, 04:35:11 PM »

Kevin if the LPG installer doesn't play ball there is only one place it's going.

I will throw the spare in so you can reach lol.

I use panic for those jobs where it involves lying on the floor in the rain

isle of man · « **Reply #93 on:** November 04, 2012, 05:35:18 PM »

Quote from: jay140285 on November 04, 2012, 04:35:11 PM

Kevin if the LPG installer doesn't play ball there is only one place it's going.

I will throw the spare in so you can reach lol.

I use panic for those jobs where it involves lying on the floor in the rain

Your going to be waiting for some considerable time then?

ChrisS · « **Reply #94 on:** November 09, 2012, 04:43:57 PM »

The system I had put on the WK 5.7 is a multi-point injection and the valve lube fluid is pumped individually to each injector boss via a swept T piece. I can see how a single point of injection onto the plenum could indeed lead to issues

All the research I did before I went for LPG on mine said that the 5.7 was fine with LPG but being the paranoid sort, I figured why not have the added safety of the valve lube option.

jay140285 · « **Reply #95 on:** November 09, 2012, 04:51:36 PM »

Well either way mine is dead.

I am going to be looking at a few £££ to sort out the mullered valve and sort the rest at the same time I think.

Do I spend at a guess £600 ish and just sort out the broken valve, or do I go down the route of changing or what ever they need the other 7 whilst its apart at a cost of

?

demonicwillow · « **Reply #96 on:** November 10, 2012, 11:42:48 AM »

Has the head/s been pulled yet ??

gazjeep · « **Reply #97 on:** November 10, 2012, 11:50:04 AM »

I guess you have to work out how much it is worth if all was running well & go from there to see if it is worth doing our moving on for spares or a replacement engine from a motor being stripped

wildwood · « **Reply #98 on:** November 10, 2012, 12:05:10 PM »

unless you strike lucky in the spares dept.... Reckon a sad breaking is in order.....

is it worth getting most of the LPG kit stripped off to use on a 6cyl 4 litre (yes I know brain and injectors will be different) but could help reduce costs....... All the shiny bits off and saved for later....

not ideal I know but the 6s love LPG......had mine on the. 1 Tonne for 5 years........ deep Joy

gazjeep · « **Reply #99 on:** November 10, 2012, 12:36:16 PM »

The hippy speaks sense young Jedi

Author Topic: Jeep WJ Major Misfire (Read 15842 times)

jay140285

jay140285

demonicwillow

big g

demonicwillow

Panic mechanic!

jay140285

demonicwillow

jay140285

jay140285

demonicwillow