injector nozzle number

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strada-caster
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injector nozzle number

Postby strada-caster » Thu Sep 13, 2012 8:09 pm

I had my injectors rebuilt last year hoping for my performance and fuel issues to disappear. to my demise, absolutely nothing changed after the rebuild, and I've been raking my brain for the last year trying to figure out my problem.

leak down test, comp test, injector pump seal, new fuel lines....
The engine coughs and farts on start up until a little heat is generated(kinda like its missing a cylinder), has 10-15% worse fuel mileage and 10-15% less power.

The shop used #112 nozzles. From my research, #112 nozzles were used until 1993, then #130 were used afterwards in the 4d56T engines.

My questions are:
-are any importers selling #112 nozzles?
-Have the importers always been selling #130 nozzles for the pre '93 engines?
-should I get #130 nozzles installed?

EDIT: THIS IS ON A 4D56 ENGINE. PLEASE MOVE IT TO THE L300 TECHNICAL.

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Re: injector nozzle number

Postby nxski » Fri Sep 14, 2012 7:43 am

There may be other factors than just the injectors. EGR, air in the system, glow plugs, etc...
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Re: injector nozzle number

Postby Feds » Fri Sep 14, 2012 11:20 am

strada-caster wrote:
The engine coughs and farts on start up until a little heat is generated(kinda like its missing a cylinder)



That symptom makes me think you've got a bad glow plug. I just changed mine, and even though the resistance was the same on all of the old ones, 2 would glow within 5 seconds, and the other 2 took more than 10 seconds to glow. I was getting hiccough-y starts even when it was 10-15° outside.

As far as performance issues: What else can you tell us? Do you have a boost gauge? Did you make any other changes (Tires, lift, accessories) that might make a difference?

If compression and leak down are good, and you're confident in the fuel delivery, perhaps low boost, or fuel pump timing are at issue.

strada-caster
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Re: injector nozzle number

Postby strada-caster » Fri Sep 14, 2012 1:20 pm

i can blame the glowplug controller for the start-ups. they don't cycle after start-up. I have a manual switch to fix that.
glowplugs are fine.

the performance and fuel mileage came on over a period of at least a year progressively getting worse.

boost gauge installed and working fine.
engine timing and injection timing are both right on. I've changed the timing belts, water pump and had the IP timing checked afterwards. no changes in the symptoms were noticed during those repairs.

I know there is no air going into the IP in the fuel lines. I've used a clear line to check that.

strada-caster
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Re: injector nozzle number

Postby strada-caster » Fri Sep 14, 2012 1:22 pm

I started this thread to try and get a comparison between the two injector nozzles. anybody know where I can find anything helpful?

spray pattern?
is one meant for turbo? one for non-turbo engines?
cracking pressures?

I haven't been able to find out any of that info.

strada-caster
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Re: injector nozzle number

Postby strada-caster » Wed Sep 19, 2012 10:22 am

OK, any 4d56 oil cooled turbo before 1993 will have the PDN 112 nozzles, therefore I have the correct nozzles.

thread dismissed!

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Re: injector nozzle number

Postby Strada 92 » Thu Sep 20, 2012 3:13 am

Check pressure of the fuel pump.You need good pressure,mainly on cold start.
I've just put a new rebuild fuel pump on my Strada.They changed rotor head,cam plate,
tune it and it is like a new truck.Absolutly no chugging,cough or anything wrong.Fuel
economy is better.
I bought a used pump on e-bay(coming from a Pajero) with automatic cold start device on it and send the pump
for a complete overhaul.

I'm pretty sure it's your problem.
Mitsubishi Strada Ralliart 1992 (sold)
Mitsubishi L400 Spacegear
Mitsubishi I-MiEV 2012

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Strada 92
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Re: injector nozzle number

Postby Strada 92 » Thu Sep 20, 2012 3:29 am

You can aslo try to give advance on the fuel pump timing.That will compensate the wear of
the cam plate but will not do anything for the pressure.
Give advance on the timing and you will see a difference.The timing on our truck is 7 degrees,try
for 5 degrees,like on 4d55,or even lower,until you notice a difference.The sound of the engine
will change a bit but nothing wrong.
That should help for cold start.

But nothing will be better than rebuild the fuel pump.
Mitsubishi Strada Ralliart 1992 (sold)
Mitsubishi L400 Spacegear
Mitsubishi I-MiEV 2012


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