Hesitation / Poor Throttle Response

[Kenton]

They will be dephi injectors that have been reconditioned. Not Ford, as they never made the injectors. I know Siemens did make the later Mk1's if I am not mistaken. Not wrong, but not correct wording from the seller either

[pl01]

You can see the box in the pic.....here is the listing:

https://www.ebay.co.uk/itm/Genuine-Ford ... 635-2958-0

Part is listed on Ford catalogue 7zap.

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[pl01]

They will be Delphi injectors that have been reconditioned. Not Ford, as they never made the injectors. I know Siemens did make the later Mk1's if I am not mistaken. Not wrong, but not correct wording from the seller either

Sorry I wasn't meaning Ford manufactured them, I know they are Delphi by manufacturer, and these parts are listed as remanufactured and listed as a Ford part available from main dealer. My point was firstly I was leaning toward these being of good quality and within tolerance as they carry the Ford logo (being remanufactured / reconditioned by AN OTHER), my reluctance was regarding the price they appear very reasonable. I hope they are genuine end of line stock or something like that.

I have been trying to find definitive leak off test data / test procedure to identify good from bad injectors by test data, rather than this one leaks more than that one.

I found this but I do not think it applies due to model: https://www.fordwiki.co.uk/index.php?ti ... k-Off_Test

If it does my new injector fitted is a load of crap, anyone know where or if leak off volumes are listed for 1.8 TDCI Delphi injectors and test specifics?

[Kenton]

Remember the new injectors need to be coded in if you haven't done this already

[pl01]

Yes the new one was coded.

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[metalworker0]

What you need is one of these. wonder if his could be made into a diesel injector tester.
What you are looking at here is a fuel injector bench. (petrol)
This is used for testing and calibrating fuel injectors.
The analogue knobs control two 555 timer IC's and an LM1949 IC, ( you have control of pulse frequency and duration) the circuit was built by a friend ..I built the rest.
which consists of a lpg camping stove gas bottle, small Datsun oil filter as a fuel filter, adaptors for the injector, pressure gauge, 5 amp power supply. - it works on the air over fluid principle. 30 PSI
i left the knobs set, i timed the injectors with a timer that switched the power supply on off after a period of time
i didn't need a multi ..as i just did one at a time .

all the best.mark

[pl01]

All fixed now. Problem was one or more injectors. Fixing just one did not solve the issue, improvement but issue still there. I have replaced all 4 and no longer have the hesitation issue. For anyone reading this with a similar problem, perform a leak off test. Unfortunately I cannot find injector specific leak off data, but I have followed the test as per fordwiki page. My results are far exceeding what is claimed within tolerance over the 5 min period but I know this is not the same injector, nevertheless the van now drives perfectly. Results are with 5ml of each other. Cost me 360 pounds in total, as I needed a new fuel line plus 4 x remanufactured delphi ford retail packaging injectors.

The Test:

The test that I used starts with 2 minutes running at idle followed by:

30 seconds with the accelerator held at 3800 rpm followed by:

30 seconds at idle followed by:

30 seconds with the accelerator held at 3800 rpm followed by:

30 seconds at idle followed by:

30 seconds with the accelerator held at 3800 rpm followed by:

30 seconds at idle.

Delphi state that the fuel temperature should be no less than 50C so hot engine for this test.

https://www.fordwiki.co.uk/index.php?ti ... k-Off_Test



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