1hdt smokey

[BOGAN80]

Hi, have a 1hdt
Getting hard to start when cold hasnt really been an issue, blows white raw fuel smoke when cold, also blows white raw fuel when decelerating down hills for long times(egts drop aswell as low water temps). Also has a slight shudder when revved up slightly but goes away above or below that certain point.

Side note, no glow plugs due to no rail, have never needed them always started first hit. Only an issue recently now when cold.

Cheers

Motor and Injectors have 60k kms and head has 40k kms

When into it changes to black smoke. My main concern is sorting the smokey idle, hoping fixing that will also help with cold starting.

 

[BOGAN80]

Extra note

No loss in power or change in fuel, no blow by at all

 

[TheBussman]

What brand at the injector nozzles? Glow plugs will help reduce smoke after cold starts they have a afterglow feature were they will stay on awhile after startup, help reduce soot in your engine. I recomend getting the glow system working. Do you have ASCD?

 

[BOGAN80]

Bai

What brand at the injector nozzles? Glow plugs will help reduce smoke after cold starts they have a afterglow feature were they will stay on awhile after startup, help reduce soot in your engine. I recomend getting the glow system working. Do you have ASCD?

Bailey's diesel group done the injectors, so not to sure.
Might try sort it, I can't find a rail for it though.

The cold start on the pump has been removed

 

[TheBussman]

Bai

Bailey's diesel group done the injectors, so not to sure.
Might try sort it, I can't find a rail for it though.

The cold start on the pump has been removed

I know you said the head is fresh, might be worth checking the valve clearance again, it's easy enough, so is a compression test.

 

[BOGAN80]

If low on compression wouldn't it be expected to lose power and use more fuel?

I could check the valve clearances. Something I didn't think of looking at seeing as everything's so new.
The motor doesn't sound off at all apart from that shudder with slight throttle in neutral.

 

[AussieHJCruza]

What year is the engine and have you got the correct washers under the injectors? Pistons changed for MY93 and if the wrong washers are under the injectors they tend to be very smoky.
Secondly, check for air leaks in the fuel system. The fuel filter head/primer is a regular offender. Air in the fuel will effectively retard your timing which can lead to white smoke.

 

[BOGAN80]

What year is the engine and have you got the correct washers under the injectors? Pistons changed for MY93 and if the wrong washers are under the injectors they tend to be very smoky.
Secondly, check for air leaks in the fuel system. The fuel filter head/primer is a regular offender. Air in the fuel will effectively retard your timing which can lead to white smoke.

Not sure on year, I purchased the motor 2nd hand but rebuilt,

I changed the fuel lines to and from the lift pump on the weekend, my next step was to change the lift pump,

I have noticed what appears to be a minor weep on the return rail on number 1 injector right on the top.

 

[AussieHJCruza]

Not sure on year, I purchased the motor 2nd hand but rebuilt,

I changed the fuel lines to and from the lift pump on the weekend, my next step was to change the lift pump,

I have noticed what appears to be a minor weep on the return rail on number 1 injector right on the top.

See if you can find out, or put up the engine number and some other members might be able to help with comparison. It definitely does make a difference.

 

[BOGAN80]

See if you can find out, or put up the engine number and some other members might be able to help with comparison. It definitely does make a difference.

I will have a look Into that, will there be any visible sign if they are wrong?

 

[BOGAN80]

See if you can find out, or put up the engine number and some other members might be able to help with comparison. It definitely does make a difference.

I put a brand new Toyota head on it, so I'd assume it's later injectors then?

 

[AussieHJCruza]

I put a brand new Toyota head on it, so I'd assume it's later injectors then?

The difference is in the piston bowl, so not necessarily.

 

[AussieHJCruza]

I will have a look Into that, will there be any visible sign if they are wrong?

They're a different thicknesses, I can't remember right now if the earlier ones are thicker or vise versa, but you'd have to pull them out to check which often means destroying them so would recommend new ones on hand before you start.

 

[BOGAN80]

They're a different thicknesses, I can't remember right now if the earlier ones are thicker or vise versa, but you'd have to pull them out to check which often means destroying them so would recommend new ones on hand before you start.

Okay thanks, what difference does that make internally? If they are sealed etc?

 

[AussieHJCruza]

Okay thanks, what difference does that make internally? If they are sealed etc?

The bowl in the piston is a different diameter and depth MY90-92 and MY93+ - the different thickness washer positions the injector correctly for the respective bowl.
If the fuel isn't being sprayed into the bowl correctly they'll always smoke.

 

[BOGAN80]

The bowl in the piston is a different diameter and depth MY90-92 and MY93+ - the different thickness washer positions the injector correctly for the respective bowl.
If the fuel isn't being sprayed into the bowl correctly they'll always smoke.

Okay thanks, thats good to know I had no idea that was a thing.

 

[mudgudgeon]

You have an electric lift pump?

If so, air in the fuel lines shouldn't be an issue.

Toyota doesn't use a lift pump. The fuel injection pump draws fuel from the tank itself once its primed. Fuel lines are under a vacuum and will suck air in through any kids joint or cracked hose etc

If you have an electric lift pump, the fuel lines from lift pump forward are pressurised, so this shouldn't be a problem, unless you have bad lines from tank to lift pump?

 

[BOGAN80]

You have an electric lift pump?

If so, air in the fuel lines shouldn't be an issue.

Toyota doesn't use a lift pump. The fuel injection pump draws fuel from the tank itself once its primed. Fuel lines are under a vacuum and will suck air in through any kids joint or cracked hose etc

If you have an electric lift pump, the fuel lines from lift pump forward are pressurised, so this shouldn't be a problem, unless you have bad lines from tank to lift pump?

By lift pump I ment the filter primer pump sorry

I understood the injector pump has essentially 2 pumps in 1, but I can see what you mean by the vacuum issue, I might look into chucking an electronic "lift pump" in maybe that will help eliminate problems.

Does it matter we're I put the electric lift pump?

Thanks

 

[mudgudgeon]

It's debatable if there's any advantage using a lift pump.
Eliminates the need for a hand primer.

I have read it can affect timing advance in the injection pump, but in not sure.

It's another thing that can fail.

 

[BOGAN80]

It's debatable if there's any advantage using a lift pump.
Eliminates the need for a hand primer.

I have read it can affect timing advance in the injection pump, but in not sure.

It's another thing that can fail.

That is a fair point.
If I installed one it would tell me iv got some form of air/fuel issue between the pump and tank tho wich could be handy?

And It could potentially show me any leaks in lines? Where a vacuum might not?