Skyline r33 fuel injectors guidance

[Bob Virk]

Skyline r33 fuel injectors guidance

Hi guys my car fuel consumption is so high it's doing 250 per tank 55 litres means 20 litres per 100 km . So had oil nd filters changed mechanic said spark plugs r ok .

so now I am thinking to replace its fuel injectors. Currently looking on eBay but confused which ones are good for me. 750 cc nd 550 cc company brand my4 . Also can someone tell me do I have to change other things to replace the injectors on my car . What's the factory injectors info like (what cc or brand ) etc . Can I use the same coil pack for new injectors as it's already on the car I mean factory coil pack or I have to change coil packs too according to new injectors? Thanks guys hope to get some good information cheers 

[inmaniac]

There are a number of things I'd check before replacing injectors dude:

• Oxygen Sensor
• Intake/Filter - check for blockages
• Temp Sensor
• AFM - might need a clean
• Thermostat
• Vacuum leaks

All of these things are far cheaper and easier to address than injectors. Have you done the basics? Low tyre pressure combined with old/thick oil can actually affect fuel consumption pretty dramatically. Are you running good, 98RON fuel?

Maybe try a reputable fuel system/injector cleaner too.

[KiwiRS4T]

You can't really change the injectors with the stock ecu. You could get them cleaned and tested. Did the mechanic actually pull out a spark plug to have a look? By the time you have gone that far one would normally change the plugs anyway. If you look in the DIY section you will find a guide to changing the plugs. get new ones gapped down to 0.8mm. Give the coils a good clean and if you see any burn marks where they have been shorting you should ideally replace them with OEM or Splitfires (or at least spray or wrap them with insulating tape).

If you can go through the list in the previous post. Dirty air filter is a top suspect. There is a DIY somewhere on how to clean AFM. If you want to know how to do something Google the question first and you will usually find the answer. If you don't usually do your own work get a few tools and start now or your Skyline will keep you poor!!

[iruvyouskyrine]

There are a number of things I'd check before replacing injectors dude:

• Oxygen Sensor
• Intake/Filter - check for blockages
• Temp Sensor
• AFM - might need a clean
• Thermostat
• Vacuum leaks

All of these things are far cheaper and easier to address than injectors. Have you done the basics? Low tyre pressure combined with old/thick oil can actually affect fuel consumption pretty dramatically. Are you running good, 98RON fuel?

Maybe try a reputable fuel system/injector cleaner too.

 

This is a great list!

 

Before doing anything related to the injectors check all these things above first. Also put in new spark plugs, new fuel filter and new oil. After doing all the things listed above start writing a log and the come back with those results and we can help further. Have fun!

 

[Bob Virk]

Hi guys it's temp needle never goes up it always few minutes to come normal level so it's can't be temp sensor or thermostat. Um just gonna change its air pod which not much $$$$ and will clean AFM thanks. But whenever I start cold engine like next morning it's turn up but after couple of rounds it's goes off . But day time it's alright just 1 round nd runs smooth. Any idea why ?

[Missileman]

There are two temperature sensors, one for the dashboard gauge and one for the computer to operate the fueling tables, so yes it still could be the cause of your issue.

O2 sensor

Computer Temp sensor

and bad/ stuck thermostat.

They are your most likely culprits.

 

 

[Die$eL]

1 hour ago, Missileman said:

There are two temperature sensors, one for the dashboard gauge and one for the computer to operate the fueling tables, so yes it still could be the cause of your issue.

O2 sensor

Computer Temp sensor

and bad/ stuck thermostat.

They are your most likely culprits.

 

 

Thermostat is a likely culprit. I'd say change it either way.

[iruvyouskyrine]

Hi guys it's temp needle never goes up it always few minutes to come normal level so it's can't be temp sensor or thermostat. Um just gonna change its air pod which not much $$$$ and will clean AFM thanks. But whenever I start cold engine like next morning it's turn up but after couple of rounds it's goes off . But day time it's alright just 1 round nd runs smooth. Any idea why ?

This is incorrect, as missleman said there it 2 senders. If the sender for the ECU has died it will be reporting full cold temp and as such the ECU will compensate by adding lots of extra fuel as it thinks it is in very cold conditions. The temp sensors are on the inlet manifold near the top radiator hose. The dash one is the single pin and the ECU one is the two pin plug.

[Bob Virk]

Thanks for your advice guys 

I clean the AFM 

had look on oxygen sensor it looks ok 

spark plugs on the way to be replaced 

had look on temp sensor not sure they working properly but looks ok too

but I can tell yah my car has bad starting in the morning. Daytime it's ok but morning time it takes 2 push or I have to accelerate to help engine turn up . I am really confused if it's temp problem then it shouldn't have starting problem. Looking to hear you again please 

[inmaniac]

At this stage I would stay patient until your spark plugs arrive. Put them in and see if that fixes your issue, as it may well be them.

After that, I would start by replacing the O2 sensor, temp sensor (2 pin) and thermostat. Sensors can be got for around $40ea and the Thermostat around $50.

We've given you the advice mate, just have to follow it 

[Bob Virk]

Hi guys um back with same issue I have replaced spark plugs nd splitfire coil packs but car still sucking the fuel same way nd in the cold morning still has same bad starting engine just stall sometimes it seems like motor has breathing difficulties but not sure what it is any suggestions please. It's r33 by the way um posting pics very soon it's got front facing plenum, front mount inter cooler apart from that it's a stock car. Sucking fuel more than 20 litres per 100 km don't know why