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Old 08-12-17, 05:33 PM   #1
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Hey guys I'm having some problems and I've traced it to the injectors.

My symptoms are:

Extended crank times when left overnight
Hesitation under load
Terrible mpg
Surging when able to finally accelerate.
Rough idle.

I've done a leak off test and everything looks ok. What would be my next move?

Should I box up my injectors to be sent off for inspection and order some new leak off clips and copper washers? Or should I take it to a diesel specialist and have them check temps on each cylinder?

307 2.0 Hdi 136 RHR
Siemens VDO injection.
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Old 08-12-17, 06:10 PM   #2
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Option 2 for me.
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Old 09-12-17, 09:29 AM   #3
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It's a bit confusing though. I assumed listening to each injector fire and doing a leak off test would highlight something but I guess not.

The old owner changed the fuel pump and referenced a lazy injector and tried to offer me a tuning box. I assume the box has killed the injectors and the old pump.
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Old 09-12-17, 12:28 PM   #4
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What is a tuning box then?
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Old 09-12-17, 12:30 PM   #5
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One way to check each injector would be to remove each in turn and run the engine to check the spray pattern of each one whilst the other three are still fitted of course!
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Old 09-12-17, 01:15 PM   #6
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You should never run a modern diesel with an exposed injector nozzle.

Diesel being sprayed out at 1750 bar can do serious damage to you and the car. Injectors should only be tested in a test rig

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Old 09-12-17, 01:28 PM   #7
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Yep...I aggree (with windy)...get them tested by a diesel specialist and refit with new pipes..you can see the pressure the pump is at by looking a planet...that will eliminate the injector doubt..
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Old 09-12-17, 01:46 PM   #8
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Fuel pressure is fine but fuel economy is really bad and there is no torque in the engine.

A tuning box is one of those cheap remap alternatives that plugs in and tricks your car into making more fuel pressure. Like a bleed valve but for fuel pressure.
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Old 09-12-17, 02:04 PM   #9
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some of the ones I,ve seem just tell the ecu the car engine is colder that it is to incease the fuel injection time to inject more fuel as it thinks its a cold engine...my rhr has been remapped and still gived me around 50 mpg..but not on short trips..a 5 mile nip out=30mpg,,
so with your short test runs the average will be well low...average over a long trip 55mpg
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Old 09-12-17, 02:09 PM   #10
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I average about 20-25 mpg. It's a little better on the motorway but it's that bad it even uses a decent amount ticking over. It's foot to the floor everywhere just to keep it drivable.

Put it this way. My 1.6 hdi 90. 15 each way to my mum's. The RHR, 35
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