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Roy
Roy, import/domestic specialest
Category: Car
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Experience:  ASE master tech for 40 years
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F350 7.3 powerstroke: I am in Australia and have a 96 7.3 which

Resolved Question:

I am in Australia and have a 96 7.3 which misses at start up and then the idles smoothes out after 10-15 minutes. It will then be good until left overnight and the problem is there again the next morning. Could it be a poor injector?
Submitted: 10 months ago.
Category: Car
Expert:  Roy replied 10 months ago.
Good morning, my name is XXXXX XXXXX X will assist you.

Yes, it could be an injector which is common but in order to find the miss, do you have a scan tool to see which cylinder???

Before condemning the injector, a more common issue is the valve cover gasket as the electrical connector for the injectors goes through that point and could be causing a bad connection. I would look there first to be sure there is no issue at that point.

Roy
Customer: replied 10 months ago.


The auto electrician has checked the gasket and connections electrically and it tests OK. The issue I have is why the miss disappears after a short time. if it was a faulty injector would the miss not be there continuously.

Expert:  Roy replied 10 months ago.
did he remove the valve cover to check the connection on the inside of the gaskets??? That a big job on its own.

It depends on the spray pattern of the injector. It can be intermittent.

Roy
Customer: replied 10 months ago.


yes the valve covers were off and I believe he checked it inside the cover. The mechanic also commented that there was not a return oil flow from the injector. would you suggest that I replace all the injectors to be sure or only the single unit.

Expert:  Roy replied 10 months ago.
you could replace just the bad one but did your guy find out which one has failed?? Replacing them all is always a recommendation but very costly.

Roy
Customer: replied 10 months ago.


none appear to have failed electrically but one cylinder is running colder than the others so we think that is the one that is down. I still do not understand why it gets going after a short period of time.

Expert:  Roy replied 10 months ago.
It is from the make up of the injector and the extremely small orfices that are in them. Any build up of carbon or any other debris will change the spray patterns to effect cold operation.

Roy
Customer: replied 10 months ago.


Thanks for your help. would a engine flush help with getting the carbon removed or is the only option to remove the injector and replace.


 


Thanks for al your help

Expert:  Roy replied 10 months ago.
you can try the flush. It is always good to clean it up but as far as the injector. you cannot get into the injector with the flush. Try some diesel injector cleaner and see if that helps before doing the injector.

Dont forget to hit the smiley button so I get credit for my answers

Roy
Roy, import/domestic specialest
Category: Car
Satisfied Customers: 1244
Experience: ASE master tech for 40 years
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