I thought I would check to see what my plugs are like since I know that cylinders 5 and 7 are the only cylinders that get fouled. All the other plugs in the car pretty good looking. I took a picture of plugs number 5 and also plug number 1 to show the comparison.

I have done a compression test and all the cylinders showed 195 - 205 psi so they were all very close. My oil consumption is very minimal i'd say it is normal and healthy.

The compression test was a dry test I should add.

On start up the car does smell a little rich with white blue smoke coming out from the exhaust but that soon dissapears.

The car is converted to MAP it is and 86 Camaro. I know the bloke who had my car had the car runing on the old MAF ecm etc... so It was running very very rich and that is why I fixed it and since doubled my mileage so to speak. The plenum inside is very dirty with black fuel buildup. When I put my finger in there it comes out black.

The cold start injector is not connected to the ECM but it is still in place next to the runners. Could that be the culprit? As the cold start injector is right above cylinders 5&7. Could it be leaking fuel or soemthing like that but the wire is not connected to the ECM I left it unhooked.

The plugs are not very old I'd say I have done about 1500 miles on them. When hooked to my laptop the cars BLM's are very much all near 128 they are in the 122 - 133 range.

Mileage I get about 60L to 670km that is about 418 miles to 15.5 gallons.

The more I think about it maybe the 9th injector is runing full time. Because the car does smell rich when I am at lights etc, I can smell the fuel.


Here is the picture of the plugs.

 

Yhe right plug is definitely carboned from excess fuel and/or oil. The left plug appears relatively normal for a mildly rich condition.

The cold start injector does not spray fuel directly into the plenum, but sprays into the air passages cast on the underside of the plenum that distribute the air/fuel to the front, right behind the throttle body. Therefore, even if the cold start injector were leaking or constantly operating, it would not necessarily flood only the closest cylinders, but all of them. You problem is more likely with the service injectors in those cylinders, and /or oil being introduced into those cylinders.

One means to prove or disprove your theory would be to connect a fuel pressure gauge and test pressure after shut down. The system should maintain pressure for at least 15 minutes. I presuem since you've converted to a speed/density scheme, you no longer have the cold start injector electrically connected, correct? If not, you should remove the connector from the cold start injectos to test your theory.

Another contributing factor could be a weakening oxygen sensor with the classic degrading signal, contributing to an overall rich condition, or rather, it's inability to report a rich condition as rich, therefore making you integrator numbers appear to be in the "normal" range. Is your sensor fresh?

 

Check to make sure your 5 and 7 wires dont cross or arent switched.

 

Guys thanks for the input. Just a few things I should add after reading your posts. With the cold start injector going by Mike Davis instructions I might have read them wrong and thought that to leave a wire unplugged from the ECM. Thinking tha the ECM controls the CSI. Looks like it is not controlled by the ECM reading through your replies and that I have to unplug the connector to the CSI correct? I left a wire going into the ECM unplugged I should check to see what that wire is for if I missed something.

The o2 Sensor is relatively new. I have done about 8000 miles in 3 years and that is how old the o2 sensor is. It was recently pulled out when I had some headers made up for the car.


The fuel pressure I will need to buy a gauge for it and check. Saw one on Jegs Hypertech brand for 49.95 that should do the job.

I will check the wirring to see if 5 and 7 don't cross or anything like that.

I will also just unplug the connector to the CSI and see if it helps at all.

The guy who did my custome set of headers tri-y's installed the o2 sensor in number 1 and 3 where they join. He also did not use any gasket under the headers but use some stuff called selastic? Said it was the best stuff to use with headers.

I remember someone a long time ago saying that selastic kills o2 sensors any truth behind that?