Hey guys,
Just got off the phone with the mechanic and the cylinder 6 & 7 does not work but there is great compressor test the coils are fine, the spark plugs are fine and the injectors are fine!!! what's next... any suggestion??? The mechanic doesn't seem to know and I don't want to pay $600 in labor!!!

Thanks in advance!!!

 

So, two cylinders are dead, but the compression test was fine, the plugs are fine and the injectors are fine. That doesn't make a whole lot of sense.

Are there any codes?

 

Well I don't have the codes on hand but he told me that it gave him the cylinder #7 and intermitant cylinder problem code.

 

Also, the mechanic told that the plugs of the two cylinder should smell like gas and they don't and thats what brought him to the injectors but when I called this morning to get news, the injectors are fine!!!

 

If all that is true, could something be a rye with the valves, not opening. I would think if it was a valve problem though that you would have other problems. I dont know.

 

I'd find a new mechanic.....if the plugs don't smell like gas and they're not firing, then the injectors can't be working right.....

 

When I first learned how an engine works, it was simply broken down.
You need air/fuel, compression, and spark.
Compression test was good, so this can get eliminated.
Spark plugs and coils were working, so this can also get eliminated.
Injectors are apparently ok, so this can get eliminated.

With the results you got from this mechanic... it should run.
Find a new mechanic... cause this guy sounds like an idiot.

 

Is it possible the plug wires for 6 and 7 have been switched, This would def cause a problem and you would have compression,spark and fuel and the plugs would be sparking so they would burn off the fuel just not on a compression cycle.,If after checking this the problem is still occurring I would look at the valve train for possible problems.

VJ

 

No plug wires on a 5.4...its coil on plug...

 

I have to agree. If the coils and plugs "test" ok fine, but are they getting a signal to fire from the control module? Or, how did he test the injectors? If he bench tested them fine, but are they getting a signal from the control module?

 

I'd swap injectors and coils around, easy enough, to see if I could change the misfire or lack of. then find a new mechanic.