Injectors Spraying Too Much?

[1987 GMC Jimmy]

I don't think my injectors are stuck, but I was wondering if they are pushing too much fuel. I've already put a new CTS, new EGR valve, new O2 sensor, and I've checked the MAP sensor line. I unplugged an injector, and it started but coughed and missed. The breather is currently off, but I don't think that has anything to do with it. This isn't the best video because I was in a hurry, but there are a couple good shots of they spray pattern.

https://youtu.be/oFpeVJwuJ1k

 

[Georgeb]

Have you cleaned the ground connection by the cts on the intake? Also the back one between the head and the firewall?

 

[1987 GMC Jimmy]

The ground on the intake is clean, but I didn't know there was one on the back. I'll have to check that out when I get the chance. However, I'm not getting any codes for the CTS or anything for that matter. It's just smelly.

 

[Georgeb]

What is in it for a thermostat?

 

[1987 GMC Jimmy]

It's a 195 degree t-stat. I checked the temperature where the temperature sender goes in, and it said 195-196 so I guess it's doing its job well.

 

[Georgeb]

It's a 195 degree t-stat. I checked the temperature where the temperature sender goes in, and it said 195-196 so I guess it's doing its job well.

My 87 smelled rich too. I ended up running 12 deg advanced initial timing and it ran much better. Spend some time looking for vacuume leaks with a can of carb cleaner. Spray all the hose connections and around the intake and base of the TB. You will hear a change in RPM if you spray a leak.
I would also check your fuel pressure. Low pressure could result in a poor spray pattern. You need between 9 and 13 psi.
I hope some others chime in here as well.

 

[1987 GMC Jimmy]

Does the video link work okay? I will check for leaks when I'm with the car again. It's not setting off any codes, it starts on the first try every time (hot or cold), and the richness does seem to go away after I've driven it. I just don't see the injectors pulsing as pronounced as they should, which I guess if they're not sticking, that could point to a bad regulator. I'm sure the fuel pump is old, but when everything's alright with the sensors, the truck is peppy and responsive. Again, just smelly.

 

[Georgeb]

Your vid worked fine.