GGosa Posted April 19, 2008 Share Posted April 19, 2008 I had a gut feeling that my engine wasn't running all six cylinders and when doing a run through I found out that the fifth cylinder from the front isn't working. There are all new spark plugs and wires and I'm getting spark to the spark plug in the cylinder and the compression is perfect but it's running extremely rich. I just put the spark plugs in three days ago and that one was black. I'm guessing either the fuel injector isn't getting a signal to it or it may be stuck open. Any thoughts? Link to comment Share on other sites More sharing options...
CWLONGSHOT Posted April 20, 2008 Share Posted April 20, 2008 New dosent mean its working properly. I suspect the wires or at least the one on/to that cylinder. Swap back on one of your old ones and seee what happens. If nothing, do the same with the spark plug. CW Link to comment Share on other sites More sharing options...
GGosa Posted April 20, 2008 Author Share Posted April 20, 2008 Already tried it. The spark plugs before were getting spark but it was about time anyways to put in new ones. The new ones are all working the way they should be. Link to comment Share on other sites More sharing options...
CWLONGSHOT Posted April 20, 2008 Share Posted April 20, 2008 Personally I don't like coincidence... If it was fine before you made these changes and now its not. Retrace your steps, I'll bet there is something you overlooked. CW Link to comment Share on other sites More sharing options...
Randy in Maine Posted April 20, 2008 Share Posted April 20, 2008 Usually if there is no signal to the injector, there is no fuel being injected. If you have a "noid light" that will tell you quickly if the injector is seeing a "fire" signal. I like a bad plug or some other weak ignition component (ignition wire?) or a leaking injector or poor compression. Usually incorrect fuel pressure will make them all run rich, so that would be less likely IMO. Link to comment Share on other sites More sharing options...
Car RamRod Posted April 20, 2008 Share Posted April 20, 2008 pull the spark plug of the cylinder in question. Link to comment Share on other sites More sharing options...
GGosa Posted April 20, 2008 Author Share Posted April 20, 2008 I was having the problem before I did the spark plugs and everything, that's why I did them to see if maybe that would fix it but it didn't. Link to comment Share on other sites More sharing options...
Car RamRod Posted April 21, 2008 Share Posted April 21, 2008 were any of the plugs out of the ordinary? Link to comment Share on other sites More sharing options...
deziped Posted April 21, 2008 Share Posted April 21, 2008 Pull the rail & swap injector 5 with 2 and see what happens. It don't take to long to do. At least you'll know if that injector is really bad or its a wiring problem. I wouldn't spend any money on parts until you track the problem. M2C Link to comment Share on other sites More sharing options...
GGosa Posted April 21, 2008 Author Share Posted April 21, 2008 The only one that seemed out of the ordinary was the one on the 5th cylinder. Thanks for the idea, I'll try swapping the injectors. Link to comment Share on other sites More sharing options...
HOrnbrod Posted April 21, 2008 Share Posted April 21, 2008 The only one that seemed out of the ordinary was the one on the 5th cylinder. Thanks for the idea, I'll try swapping the injectors. Another thing you can do is check the resistance across the injector terminals. The reading should be approx. 14.5 ohms. If not, the injector should be replaced. If okay, disco the coil wire and place a 12V test light across the injector terminals. The light should flash when cranking the engine. Link to comment Share on other sites More sharing options...
SomeNew Name Posted April 25, 2008 Share Posted April 25, 2008 The only one that seemed out of the ordinary was the one on the 5th cylinder. Thanks for the idea, I'll try swapping the injectors. Another thing you can do is check the resistance across the injector terminals. The reading should be approx. 14.5 ohms. If not, the injector should be replaced. If okay, disco the coil wire and place a 12V test light across the injector terminals. The light should flash when cranking the engine. Does that 14.5 ohms hold true for 90 renix injectors as well? cause if that's the case all my injectors read a solid 16.3 each one. Link to comment Share on other sites More sharing options...
HOrnbrod Posted April 25, 2008 Share Posted April 25, 2008 Does that 14.5 ohms hold true for 90 renix injectors as well? cause if that's the case all my injectors read a solid 16.3 each one. That's okay for Renix injectors. They can vary from 12-20 ohms. It's good that all read the same too. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now