Tb-42e lumpy under accleration

[taslucas]

Ok guys the bloke is asking about an efi engine.. so no ballast resistor no carby no points.....

No one has mentioned any of those things?

Please read before posting dribble about what your mate may have told you....

I would check fuel pressure, compression as a bare minimum to start with before anything.

Ok, at least the last part of that was constructive, but it is missing on both lpg AND petrol. So as you said above: Please read before posting.....

Clearly someone saying it could be the tps is a stab in the dark and an uneducated one at that. Check your service manual for the correct resistance readings if your unsure. But KISS (keep it simple stupid) 1st.

It was the OP that mentioned the TPS and the only response to that was mine saying that it would not be the problem

Seems a lack of mechanical knowlage on this forum in regaurds to anything not diesel. That's my rant over.

Diesles are a straight forward engine. Petrols and more importantly dual fuels are more complicated. There are quite a lot of simple things that can be the cause of a slight miss and it is hard to diagnose straight away over the internet without asking a lot of questions.
I have had the same (or similar, its hard to tell without seeing the vehicle) problem twice with my dual fuel TB42 (carby). The first time it was leads, the second time it was a vacuum leak affecting the vacuum advance.

[taslucas]

Wow ... how many contradicting responses can you get ....

If I'm not deleted/banned by the time you read this, PM me and I'll tel you what the issue is ...

Other than that; search my old threads on dual fuel issues with TB42's ... you're problem is pretty easy to isolate with the right advice ... as opposed to what you've received so far ...

Hey scotty, firstly welcome back! One way to keep threads on track with the right advice would be to post it here instead of over PM? You know that those symptoms could be caused be a few different problems but if you already know exactly what it is then please post here for the benefit of others and also so that those of us that have know idea may learn a little more.
Contradicting responses are sometimes more like trial and error...... "have you checked this?" "yes its fine", "ok then, what about that?" "yes that seems good as well"........etc

[taslucas]

Lets please keep this thread back on topic, refrain from cr@p slinging and help our fellow patroller get his beast running the best it can

So if you definately know whats wrong then please post away and help this guy

[threedogs]

I've owned a dual fuel 4x4 for over 400,000k and long distance diagnostics is not my forte.
Agree with the electrics need to be 110% no question about it , with my BIL and son being Auto lects and sharing a factory with
a gas conversion mob. I used to see it all the time, That's why I push for the use of "Y" instead of "T" pieces on the water side of gas.
Could even have an air lock in the converter. again lots of questions need to be asked as its a process of elimination, that gas person
said that 99% of gas problems are electrical

[taslucas]

lumpy on both fuels?

Slightly on gas but mainly on fuel.

I've owned a dual fuel 4x4 for over 400,000k and long distance diagnostics is not my forte.
Agree with the electrics need to be 110% no question about it , with my BIL and son being Auto lects and sharing a factory with
a gas conversion mob. I used to see it all the time, That's why I push for the use of "Y" instead of "T" pieces on the water side of gas.
Could even have an air lock in the converter. again lots of questions need to be asked as its a process of elimination, that gas person
said that 99% of gas problems are electrical

Its missing on both petrol and lpg.

[threedogs]

That's my point whats common to both ,,,,,,,,electrics
Do we know where timing is set to ??

[Drewboyaus]

I see your staying on topic and helping this bloke with his problem.

Id say this forum is mainly populated but the nerds that were picked on at school for been know it alls.. as for being an egomaniac is that all you have got to contribute to this post??? Clearly your not a mechanic and have f-all experance.

Never said I was a mechanic chief. Just a curious observer and Patrol enthusiast answering a member who was clearly miffed by someone else's curmudgeonly attitude.

Must be a relation.........


Tip tip tip......tap tap tap....

[taslucas]

I have a slight miss whilst at tick over, when I checked the leads to the dizzy I had a weak spark at No 3 I cleaned the inside of the cap and the rotor tip now all have a strong spark. Plugs and leads are all good where should I look next? Timing is set to 10%.

That's my point whats common to both ,,,,,,,,electrics
Do we know where timing is set to ??

Lol, it's all there 3d

[davo94]

Ignition with overlooking the mechanical aspects of it?? It cold be down on compression. So do a comp test and a cylinder leakage test to confirm that it is not related to an internal fault.

[Pezzer]

Hey guys I really appreciate the help, that's one reason I joined this forum also to to add any experience that I can offer to assist other members, its how we keep our vehicles on the road without going to big brother all the time emptying our wallets.
The Maverick has gone back to the LPG workshop for a tune and he is going to check a few things, the miss is definitely more apparent on fuel than on Lpg but its there. Reading other threads spiral leads seem to be the go with a cooler plug, the head has had lots of work done to it and mechanically all compressions are spot on. When I checked the vacuum lines I did not detect any leaks and no stray arcing was seen or heard at night, the vacuum operated fuel regulator shows no signs of seepage either. It does take 3 turns of the key to fire up, system always selects fuel to starts on.