Looking for suggestions on what to do next...
Thread Starter
Racer
Joined: Apr 2006
Posts: 419
Likes: 1
From: Kelso WA
Looking for suggestions on what to do next...
I'm having a problem with a rough running situation (sounds like a miss). I pulled the codes and got a 32, so after much ado, I finally got the EGR valve replaced. I restarted the car and still had the big miss at idle. Going for a drive, it ran very rough under acceleration and when I tried WOT it started pinging real bad so I backed off. Not so bad when coasting. I had previously checked spark, so I decided to pull injector connectors. There was no change in idle when I pulled the connectors to injectors 5 and 7. Before I go out and spend the money on new injectors, I want to make sure that is the problem. Here's my plan of attack: First, I'll ohm out all the injectors and see if there is a problem with the coils on 5 and 7. If the coils are bad, get new injectors. If coils are good, then I need to find out if signal is getting to them from ECM using an oscilloscope or a noid light. I suppose there is a slight chance that there is a blockage in the fuel delivery to those two cylinders also. Any other suggestions?
Burning Brakes
Joined: Aug 2007
Posts: 769
Likes: 0
From: Cincinnati OH
This may not be of any help, but in some cars ( like my 98 Taurus SHO ) if the ECM picks up a bad miss in one cylinder, it will turn the injector off to that cylinder.
Eg, I had a coil go bad ( coil on plug ) and the ECM shut off the injector to that cylinder. I replaced the coil and still had a miss. Only to have the missfire clear up after I cleared the code out.
Just a thought... Don't know if a 91 is that smart yet.
Mike
Eg, I had a coil go bad ( coil on plug ) and the ECM shut off the injector to that cylinder. I replaced the coil and still had a miss. Only to have the missfire clear up after I cleared the code out.
Just a thought... Don't know if a 91 is that smart yet.
Mike
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 413
From: WV
If you have the stock injectors in your car then the chances are good that this is the problem. Check the ohms on the injectors, they should be around 16.5 +/-.3 . Most of the people I know that have stock (Multec injectors) have had problems and changed them out. Its not if they will go bad but when.
Last edited by WW7; Sep 5, 2007 at 09:24 PM.
Le Mans Master
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
An old trick may work. In a dark garage/or at night, pop the hood and start the engine and look for sparks from plug wires grounding. Or use a water spray bottle on the plug wires to look for shorts.
