Engine misfire - fuel injectors

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Re: Engine misfire - fuel injectors

Postby Grant » Fri 28.08.2015, 19:36

After just completing my new front brake install, I have found that I now have this problem as well. Grrrrr!
While road testing the new brakes, I found that every time I drove the car for a short stint, shut it off and re-started, it would be back to what feels like 2 cylinders. Putting the gas to the floor would sometimes help to kick-in all four cylinders.

Unfortunately, I had this same issue back in 2010, but I cant remember if I replaced all 4 or just 2 of the injectors. I kind of hope I only replaced 2 at the time, and it is now the other 2 that are failing. I hate to think the injectors only lasted 5 years.
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Re: Engine misfire - fuel injectors

Postby c4mun » Sat 29.08.2015, 22:25

OK I went through the process of checking why my engine was running on 2 cylinders by removing individual plug leads. ! & 3 were not firing (and also plugs looked clean - no fuel). Then measure the resistance of all injectors and No.3 was very low.
Left off the connector for 3 and it started running on 3 cylinders not 2. Hence 3 was bringing 1 down when connected.
So replaced with MFI559 injectors - all 4.
Now runs nicely on all 4 cylinders, but some backfires and lots of popping and banging?
Any ideas? Can the ECU cope with the MFI559 injectors? Where do I go to get an analysis?
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Re: Engine misfire - fuel injectors

Postby Grant » Tue 22.09.2015, 23:46

Replaced all 4 injectors and fuel filter this weekend. Not sure what was more challenging the fuel filter or the injectors. Probably the fuel filter, as it didn't occur to me that I would have to remove the carpet and the floor from the hood stowage compartment to get to it. I did have a bit of trouble getting the filter out at first though since the fitting at the rear of the filter seemed to be rust seized to the line, so I could not reverse it out without twisting the line. So instead I removed the front fitting first (not seized) and then twisted the filter free of the rear fitting. I also managed to kink the front fuel line when reinstalling the filter, so be very careful that the line does not twist or kink when reinstalling like I did. The front line needs to be pointing straight up.

In the end the whole project went pretty smooth, and she is up and running again!
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