Tb-42e lumpy under accleration

[Robo]

I ran fuel doctor stuff, and after 4 attempts I threw it in the bin.
97 efi 1.8 ltr lancer normally getting 7.8 ltr per 100k.
put additive in tank as described that jumped to 10 lt per 100 each time.
that is while the stuff was in the tank, next tank returned to 7.8 as usual.
car wasn't suffering any problems I simply treat last tank before an oil change.
translated 4x treatments for 20 000klm.

I heard (mates Dad) of a cleaner product actually turning oil to clag clue in a diesel GU some yrs back.
but "Barry" actually put the stuff in each and every consecutive tank.
"not as described Barry".
It destroyed the mtr.

dual fuel is a real problem to tune.
electrical system needs to be 101% top condition.
cap rotor leads and plugs don't skimp on quality.

Recently replaced plugs with Y electrode as it was all I could get.
waste of time my system hates em, it missus as you describe in your problem.
I use morreys in petrol tank occasionally 3/4 strength and run it in dripper system full time for the gas/petrol.
find it helps keep system cleaner.

also check around injectors with a little light oil see if injector seals are leaking.
cleaners only really remove small amounts of garbage,that's been my experience.
removing em and proper clean and new seals if needed.
can be cleaned on car by special equipment but never done that personally.

but first get electrical system working 101% before you start looking at other systems.
x2 dark and looking for wayward sparks

[happygu]

I am not the expert on the Petrol 4.2, as my last Dual Fuel vehicle was the L28.... but

It could be a worn Distributor Advance Mechanism, Crank Angle Sensor, Ballast Resistor......

Give these three things a little look at.

Mic

[Pezzer]

ok will check these tomorrow.

[Bigrig]

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 ...

[davo94]

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

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.

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.


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

[davo94]

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 ...

This is the only post so far with any idea how to fix this blokes problem. .

[Parksy]

This is the only post so far with any idea how to fix this blokes problem. .

Mate, you merely gave the same advice I did earlier on then claim that no one else is giving good enough advice? Ffs, what is wrong with people just having a go?

[Drewboyaus]

Mate, you merely gave the same advice I did earlier on then claim that no one else is giving good enough advice? Ffs, what is wrong with people just having a go?

Don't worry about it Parksy. The bloke is an egomaniac who seems to have some sort of chip on his shoulder at the moment.......



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

[davo94]

Don't worry about it Parksy. The bloke is an egomaniac who seems to have some sort of chip on his shoulder at the moment.......



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

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.

[davo94]

Could be your injectors. Have you tried an injector cleaner? I found fuel doctor actually works, bought at super
Cheap. Have you checked fuel rail pressure? Should be 40psi. When I bought my patrol it measured about 32 psi. Changed the fuel pump and it jumped back to 40psi and made a world of difference.

Edit: forgot to add, if you have a vacuum leak, an obvious sign is a "putt putt" sound at the exhaust.

No sing of a compression test here.. as for the put put out the exhaust you may be refering to a way people check valve clearance. Fuel doc yep that will fix its as its having the samw issue on gas and fuel...