Thread: A Failure To Learn?

*bump* and-

have they tested it with the new Maf?

if its not running properly at start up it should be showing faults,,

Looks like a fault between the LPG and the petrol departments. LPG not running right and is making the system remap incorrectly.

Going like a train on Petrol now.... And I stood in front of it and pointed between its' beady little spotlights and said "If you don't behave yourself I'm trading you in on a friggin T****A!" Started and ran perfectly after that!

Just a theory at this stage. But not a bad one.

I.

Hi

Vehicle was chugging under acceleration between about 1200 to 2000 rpm. Also would cut out at this rev range. It was also suffering from a perceptible lack of performance

Is this the original problem? And how hard are you accelarating?

although on start up we still have five minutes of coughing and almost stopping....

Has this happened since the plugs and MAF have been replaced?

Mechs put it on the computer and saw that it wasn't firing on all cylinders and MAF was showing a fault.

All the plugs were about 40K old, as was the MAF.

They replaced the MAF (with a Bosch) and all the plugs, then they wiped the MAF maps (or whatever they are called) and said the truck needed to learn - so would chug for the first few starts. It did seem to improve the situation on the drive home but next start we were back pretty much where we started.

Why were the plugs replaced?

What was the problem with the MAF?
Did they replace the MAF based soley on a fault code? Or was there any other testing done? I've seen MAF's and PCM's replaced and wiring pulled out of cars by a mechanic all because a MAF fault was indicated. Actual fault was a blown fuse.

Apparently, according to the Test Machine the O2 sensors were opening and closing the way they are supposed to.

Under what conditions did they look at this? E.g. when the 'chugging' is occurring on start up, under the accelaration, when the fault was occuring or when it was OK?

Any opions on what to do next

This reads like parts throwing is going on. Whether that is the case or not, I don't know. If so I'd be taking it somewhere else.

Where are you?

Any other symptoms?

Originally Posted by mrapocalypse

Looks like a fault between the LPG and the petrol departments. LPG not running right and is making the system remap incorrectly.

Going like a train on Petrol now.... And I stood in front of it and pointed between its' beady little spotlights and said "If you don't behave yourself I'm trading you in on a friggin T****A!" Started and ran perfectly after that!

Just a theory at this stage. But not a bad one.

I.

What kind of gas system? If its running well on petrol now the gas system needs a look at.

Looks like a fault between the LPG and the petrol departments

So it's dual fuel....
Devils in the minor details.

They swapped out the MAF and changed plugs due to miss on all cylinders and the MAF was throwing up faults. Even though it was less than 18 months old.

After running it for 900Km on BP Premium unleaded we are still going well and I haven't swapped in the LPG yet. Will run another 160l of PULP and then see what happens.

Also ran some injector cleaner through it.

Can't remember what LPG system is but it's the poor cousin, not the renzo one. It was running the best on LPG, which made me Suss!

Thanks for help....

Ian.