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Ask Gavin Perry Your Own Question
Gavin Perry
Gavin Perry, Auto Mechanic
Category: Car
Satisfied Customers: 2166
Experience:  Licensed diagnostic and repair technician
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I have a van and it’s misfiring and tough at idle, 170000.

Customer Question

I have a van and it’s misfiring and tough at idle
JA: How many miles are on the car? Is it a steady misfire? Or random?
Customer: 170000. And steady
JA: What is the make/model/year of your car?
Customer: Ford transit 2010
JA: Are you fixing your Transit yourself? What have you tried so far?
Customer: yeah I’ve changed glow plugs and injector seal
JA: Is there anything else the Mechanic should know before I connect you? Rest assured that they'll be able to help you.
Customer: ones van heats up to temperature no misfiring and no rough idle
Submitted: 12 days ago.
Category: Car
Expert:  Gavin Perry replied 12 days ago.

Hi my name is ***** ***** am here to assist you Today does the engine warning light stay on see image.

Customer: replied 12 days ago.
There no engine light on?
Expert:  Gavin Perry replied 12 days ago.

More of a mechanical issue then have the injectors been tested.

Customer: replied 12 days ago.
Yeah injector have been tested and seem fine like I say glow plugs have been changed also
Expert:  Gavin Perry replied 12 days ago.

How did they get tested.

Customer: replied 12 days ago.
Thing that gets me it’s rough at start up and idle but when temperate gets to level its perfect?
Expert:  Gavin Perry replied 12 days ago.

Did the injectors get sent away for testing or just a leak off test.

Customer: replied 12 days ago.
Just a leak off test
Expert:  Gavin Perry replied 12 days ago.

They need to be sent away and bench tested properly.

Customer: replied 12 days ago.
Thing is this wasn’t a issue until I changed glow plugs as one was showing up on diagnostics machine before this the van was running fine?
Expert:  Gavin Perry replied 12 days ago.

With Delphi common rail you just need to look at it and it fails.

Customer: replied 12 days ago.
Yeah I hinder stand that but wouldn’t a fault come up on machine?
Customer: replied 12 days ago.
Understand*
Expert:  Gavin Perry replied 12 days ago.

I use http://www.merlindiesel.com for testing if that helps.

Customer: replied 12 days ago.
What’s your background as a mechanic?
Expert:  Gavin Perry replied 12 days ago.

Done it since i was 15 and i am 42 now if that's the question.

Customer: replied 12 days ago.
Ok so you think of what I’ve told you that it’s the injectors that are causing the problem?
Expert:  Gavin Perry replied 12 days ago.

Yes a sticking injector that starts working when the engine gets worm normally due to carbon.

Customer: replied 12 days ago.
Oh so I take it this wouldn’t show up on diagnostic machine that there’s a problem with Injector?
Expert:  Gavin Perry replied 12 days ago.

The injector is 50% electronic and 50% mechanical so if the mechanical part fails the ECU / module can not detect it if that makes sense.

Customer: replied 12 days ago.
Yeah that makes sense
Expert:  Gavin Perry replied 12 days ago.

Their are other companies that test injectors i just used the merlin link as an example as they are just round the corner from me.