FI help please

[sho_shane]

Ok so I just got back into a full size. Its a 87 4x4 Burb. It is FI and was having a high idle prob. Today I did a oil change, new plugs and a few vac lines. Im sure that is what was making it idle high but after I fixed everything it started idling so low that every time I stop the truck dies. Also the SES light stays on all the time. What all could that be. and how can I raise the idle? Please help.

 

[sho_shane]

Ok one more thing I just thought of. there was a cylinder looking thing on the intake kinda behind the TB that was unpluged and the vac line going to it was blocked off. I unblocked the vac line and pluged it back up.

 

[sho_shane]

15 views no help im sad.

 

[dyeager535]

What code are you getting? Your check engine light is storing it.

Not sure what the cylinder thing is you are describing, any chance you can take a pic, or at least describe it in detail, and it's location in detail? I don't know much about how the TBI motors are arranged, but it sounds like it MIGHT be the EGR solenoid?

 

[sho_shane]

Im not sure how to check the codes. But I did unhook the thing I told you about and blocked off the vac line and now it idles right.

 

[dyeager535]

http://coloradok5.com/forums/showthread.php?t=240425&highlight=checking+codes

Should get you on the path.

However, pull your ECM fuse to clear the codes, it's a lot simpler for most of us, and you don't lose your radio presets, clock, etc.

 

[4X4HIGH]

It sounds like you're talking about the EGR valve. If it is stuck open it will make the truck run like crap. To check codes you just need to jump the A and B terminals on the ALDL connector which is located just beneath the dash on the driver side (the upper right terminals are what you put a jumper wire on). Once you have a jumpoer wire between those two terminals then turn the key to the ON position engine off and watch for the SES (service engine soon) light to blink. You should get a code 12 telling you the system is working properly then any other codes will follow. The codes consist of a blink then pause then blink blink for a code 12 which will happen 3 times then any other codes to follow in the same fashion.