Thread: 95 v8 running a bit rough

Matthew,
I think you will have to do a bit more research before anyone can give you an answer.
I find your post pretty confusing.

If it goes better on gas than petrol it is likely to be something to do with the injection not ignition.
Backfiring can also mean sticking exhaust valves though it is more common to backfire from inlet valve sticking.
Or that the cylinder is not firing through an ignition problem but usually it is worse on gas. In that case it may be plugs etc related.

So see if you can narrow it down a bit.
Regards Philip A

just a bit hard with this pos ,

do you know when you get a bit of water in the feul and the car starts performing crap, it shudders and farts and back fires

thats whats happening to the disco when i accelerate on feul and dose quiet alot happen on gas

but i also find this arvo my car ran better when fooot was flat to the floor
the accelerator sensor?


in reading your response i will go and change the plugs, leads, rotor, and dizzy cap and feul filter and see where that takes me

Originally Posted by PhilipA

Matthew,
I think you will have to do a bit more research before anyone can give you an answer.
I find your post pretty confusing.

If it goes better on gas than petrol it is likely to be something to do with the injection not ignition.
Backfiring can also mean sticking exhaust valves though it is more common to backfire from inlet valve sticking.
Or that the cylinder is not firing through an ignition problem but usually it is worse on gas. In that case it may be plugs etc related.

So see if you can narrow it down a bit.
Regards Philip A

Originally Posted by matthewk

just a bit hard with this pos ,

do you know when you get a bit of water in the feul and the car starts performing crap, it shudders and farts and back fires

thats whats happening to the disco when i accelerate on feul and dose quiet alot happen on gas

but i also find this arvo my car ran better when fooot was flat to the floor
the accelerator sensor?


in reading your response i will go and change the plugs, leads, rotor, and dizzy cap and feul filter and see where that takes me

Matthew ....

I would not go in a mad rush to change things when your not sure what your changing them for??



Why don't you fill in the blanks setout below on the list of parts + the brand & the age .....

1: Leads ..........
2: Rotor button ...
3: Spark plugs .....
4: Dizzy cap .....
5: Coil ....

Now on the side of the Dizzy is the Vacuum advance unit .... A black hose goes from that to the plentium chamber ... Pull the hose off the plentium chamber and suck on it to make the vacuum advance unit work ... Does it hold vacuum or does it keep sucking air

Also make sure that your MAF plug is actually plugged into the MAF ... and make sure that your air filter (or pod) is actually connected properly to the MAF .... and there are no holes in the large black air hose going from the MAF to the throttle of the plentium

Also .... When you use the petrol ... Did you run it for a long time with very little in the fuel tank, while you happily carried on using the Gas as your daily runner ....


BTW ... Landrovers are not a POS

Mike

Originally Posted by mike 90 RR

Matthew ....

I would not go in a mad rush to change things when your not sure what your changing them for??



Why don't you fill in the blanks setout below on the list of parts + the brand & the age .....

1: Leads ..........
2: Rotor button ...
3: Spark plugs .....
4: Dizzy cap .....
5: Coil ....

Now on the side of the Dizzy is the Vacuum advance unit .... A black hose goes from that to the plentium chamber ... Pull the hose off the plentium chamber and suck on it to make the vacuum advance unit work ... Does it hold vacuum or does it keep sucking air

Also make sure that your MAF plug is actually plugged into the MAF ... and make sure that your air filter (or pod) is actually connected properly to the MAF .... and there are no holes in the large black air hose going from the MAF to the throttle of the plentium

Also .... When you use the petrol ... Did you run it for a long time with very little in the fuel tank, while you happily carried on using the Gas as your daily runner ....


BTW ... Landrovers are not a POS

Mike

sorry dont mean alll land rovers are pos just mine lol it had so much trouble it aint funny

1: Leads .......... ngk or top gun 6months old
2: Rotor button ... origonal
3: Spark plugs .....ngk 6 months old
4: Dizzy cap ..... origonal
5: Coil .... no idea of bran but bran new less then 12 months old


Also .... When you use the petrol ... Did you run it for a long time with very little in the fuel tank, while you happily carried on using the Gas as your daily runner ....
every now and then i may have left little or no feul in the tank and in one case a yellow light for a 1-200ks before i fill up both feul and gass

MAF is plugged in

as for the Vacuum advance unit ....it has A black hose goes from that to the plentium chamber, but on the other side of the Vacuum advance unit it has no pipe on it
i pulled it off the plentium chamber and sux it i dint notice anything i didnt feel it sux or anything

Originally Posted by matthewk

sorry dont mean alll land rovers are pos just mine lol it had so much trouble it aint funny

1: Leads .......... ngk or top gun 6months old
2: Rotor button ... origonal
3: Spark plugs .....ngk 6 months old
4: Dizzy cap ..... origonal
5: Coil .... no idea of bran but bran new less then 12 months old


Also .... When you use the petrol ... Did you run it for a long time with very little in the fuel tank, while you happily carried on using the Gas as your daily runner ....
every now and then i may have left little or no feul in the tank and in one case a yellow light for a 1-200ks before i fill up both feul and gass

MAF is plugged in

as for the Vacuum advance unit ....it has A black hose goes from that to the plentium chamber, but on the other side of the Vacuum advance unit it has no pipe on it
i pulled it off the plentium chamber and sux it i dint notice anything i didnt feel it sux or anything

Now we are getting a bit closer



For starters .... The leads / Coil & the spark plugs are Crucial to gas car setups ... + the engine timing

Spark plugs ... All tho you say NGK ... Exactly, what is the serial number on them??

Leads ... If they are Blue in colour then they are highly likely to be "Top guns" .... Throw them in the bin ....
.... Go buy some "Champion S/S Gas leads" ... or "Gas Master leads"

The Coil .... What kind of coil??? .... Is it a ordinary round "black" can coil that was bought from say "Rovercraft" .... or did you get one of those fancy electronic coils made by "Bosch" ... or perhaps it is a "Red" round can with "GT40" written on the side of it

The Rotor button .... Is it dark brown in colour & does it have the words LUCUS written on it .... If not ... Throw this in the bin also

The vacuum advance .... Yes there are, what looks like 2 hook up pins for the black hose ....
The 1 on the INSIDE (pointing to the Dizzy) .... is to be left alone ... Do not hook this up to nothing
The 1 on the OUTSIDE (Pointing away from the Dizzy) ... This is what that small black hose hooks up to....

Now take the Dizzy cap off
With The black vacuum hose hooked up properly to the outside vacuum pin
.... Suck on the hose and watch the Dizzy plate move .... You should feel the vacuum on your tongue and it should hold vacuum .... if you release it and allow air in, you should hear a clunk, as the
dizzy plate is sprung back into position

If all you can do is suck & suck ... and all you get is air ..... then it is CUPUT




Now for the real dooooozzy .....

You say that you have been driving around with little, or NO fuel in the petrol Tank .....
THIS IS the biggest mistake that you could have done
1: The tank needs to have at least 20litres of fuel in it .... this is to keep the fuel pump cool & make sure it does not burn out (as it runs all the time)
2: The circulated fuel also moves past the injectors to also help keep them cool
3: When you drain a tank empty, or it is on the absolute lowest level .... it has no choice but to pick up all the fines of crud and rubbish ... and send it to the fuel injectors.....and the fuel pressure regulator

You are up for a major service


Given all the different parts that are on hand ... Any chance you could post some pics of your motor and the engine bay??

Mike

A simple thing to do ....

At night / in complete darkness .... Pop the bonnet ... Start the motor and have a look around the engine bay

If ANY leads are arking out ... then you will see it plain as day

You'l be surprised to what you can see sometimes

A few more items

Firstly .... Only test the car / motor on Gas ... DO NOT use the petrol when driving or checking the motor .... You CAN switch it over to petrol to see how it compares to gas ... Using the gas side of things will take out the confusion of TPS, MAF, Fuel regulators, Fuel pump, ect
As your problems are related / but not related (gets confusing)



Secondly .... The FIRST job to do tonight is the, Start it up tonight in the dark and see if you can see the spark leads arking out ... before you buy any replacement parts



Third .... Check the inside of the Dizzy cap for the condition of the carbon pick ups and inspect it for any Hair line cracks

Fourth ... That injector cleaner that you shoved in the fuel tank ... It is not a HOT idea to leave it in there for long periods of time ... Try to use the petrol side of things when driving & get that tank down low, and refill with 20 litres / Drive that down low / then refill the tank to 3/4+ ... If I could get you to picture injector cleaner??? Hydrochloric Acid might do it

Couple of extras ....
Have you ever touched the "Gas feed valve"
Have you touched the Dizzy timing (used a Timing light?)



.... Hopefully it's just all comes down to some bung spark leads ...


Mike

Originally Posted by matthewk

you know when you get a bit of water in the Petrol and the car starts performing crap, it shudders and farts and back fires

That is what is happening to the disco when i accelerate on Petrol .... and does it quite alot when running on Gas

Originally Posted by matthewk

in reading your response, i will go and change the plugs, leads, rotor, and dizzy cap and fuel filter and see where that takes me

Yea, change the fuel filter .... When you take the old one off, tip the petrol inside the filter, into a container and see what sort of "water or crud" comes out

Make sure that you take the "Fuel tank side of the filter" off first / and tip that side into a container