Hilux Surf bad jerks

[TonyN]

I would be interested to know what kit had been put on it. Usually the gas ECU runs alongside the petrol ECU mirroring what it does (this would depend on the age of it all I guess - Tony???) I cant understand why you would have to re-map the petrol ECU as it shouldn't have been altered in anyway (unless some bright spark had had it chipped????)

WEIRD!!

Yeah, I was thinking that, if its been on a few years it won't be to technical, it'll only have injector emulators, just fool the ECU into thinking the injectors are working and not switch the engine fault light on.

[mike holland]

Hilux Surf bad jerks

Hi everybody
Some of the gas electronics have been disconnected now but left in situ as I might want to buy a tank at some time to convert to gas. The guy had a diagnostic pod which he used on the road. This showed that the Surf was ok when cold (agreed) but had a definate lean spot when it started jerking then rich and shooting forward. This was traced to the AFM which was apparently damaged due to a gas blowback (I've read that Range Rovers suffer from This when gased and it's recommended to have the ducting from the AFM slightly loose to allow for this). The Surf goes to another specialist on Friday for the AFM to be put right (hopefully). The above might be interesting to RUSTY with his V6 problem. Will keep you posted.
Mike

[TonyN]

Hi everybody
Some of the gas electronics have been disconnected now but left in situ as I might want to buy a tank at some time to convert to gas. The guy had a diagnostic pod which he used on the road. This showed that the Surf was ok when cold (agreed) but had a definate lean spot when it started jerking then rich and shooting forward. This was traced to the AFM which was apparently damaged due to a gas blowback (I've read that Range Rovers suffer from This when gased and it's recommended to have the ducting from the AFM slightly loose to allow for this). The Surf goes to another specialist on Friday for the AFM to be put right (hopefully). The above might be interesting to RUSTY with his V6 problem. Will keep you posted.
Mike

Any gas system willl blow back, it happens if the mixture leans out and ignites in the intake.

This is the reason modern motors with hitech plastic plenium chambers are bad news, like the Ford Exploroer, it granades the whole intake. On normal EFI motors it just blows the air filter box to pieces.

[rusty]

Any gas system willl blow back, it happens if the mixture leans out and ignites in the intake.

This is the reason modern motors with hitech plastic plenium chambers are bad news, like the Ford Exploroer, it granades the whole intake. On normal EFI motors it just blows the air filter box to pieces.

Hmmm, this tends to be a problem on vapour take off systems, I haven't had any blow back problems yet but there again with mine being injection it puts the gas into each individual chamber as opposed to completely flooding the whole air intake

[mike holland]

Hilux Surf bad jerks

Hi everyone
Got the surf back after 6 weeks in the garage !!!!!!!!!.
Distributer was faulty so new one installed.
AFM was shot so new one flown in from Japan.
Runs loads better now but I noticed the vaccuum to a small valve (not the EGR) was blocked off so I re-attached it and it ran better - anyone Know what it's for (front right side of engine by distributer). Still has slight hesitation on acceleration........any ideas??????

[Ricksurf]

Hi everyone
Got the surf back after 6 weeks in the garage !!!!!!!!!.
Distributer was faulty so new one installed.
AFM was shot so new one flown in from Japan.
Runs loads better now but I noticed the vaccuum to a small valve (not the EGR) was blocked off so I re-attached it and it ran better - anyone Know what it's for (front right side of engine by distributer). Still has slight hesitation on acceleration........any ideas??????

Vacuum timing advance for dizzy ? Plugs + leads replaced ??

[Apache]

I know nothing about the petrol engine you are talking about although i did once own a 2.2 hilux petrol pickup with a similar problem, it turned out that the shaft inside the distributer had worn out causing the distributer to shake about at differrnt rpms..
I hope i havnt made myself look daft and find out that you do not have a distributer with it being injection but if you dont maybe there is something similar going on
check for Play in somekind of moving engine parts


Hope you get to the bottom of it

Seen this problem with a VW Polo auto as well. Revs used to build randomly (presumably due to advance) and it would strain against the brakes. Changing the dizzy cured it. May be worth checking water temp sender too, and oil temp sender if it has one.