Tbi swap build thread

[rfmaster]

Originally Posted by dropd80s

Finally got my CCSB pulled out of the shop under its own TBI'd power yesterday! Shes an 86 with a 90 sub TBI 350/700 and complete harness swap. Everything stock. My problem is she seems to be running very rich. I have considerable black smoke at idle. I have let the truck warm up to operting temp, and still have no codes stored. Everything is clear.

I am curious if the higher pressure fuel pump I ran (E2000) is overloading the FPR?
I know I need to check and make sure the 5/16" return line I ran is not kinked.
Also, I have no exhaust on the motor, only a few inches of pipe on the manifolds. Could this be cooling my 02 and not letting it read properly?
I assume this could also be a CTS problem or Vacuum leak?

Any ideas you guys have or how I should go about ruling things out would be a huge help. Thanks in advance

Yes, all of the above can potentially cause rich condition. Make sure that your harness has ALDL connector wired and SES is functional. If your ECM sees open CTS it will set Code 15 (very cold temperature = rich fuel mixture!) Jumper Pin A&B of ALDL and read SES blinks.

I would go through the check list first before jumping to any conclusions.

1) Verify operating fuel pressure by measuring FP at the input port of the TB with a fuel pressure gauge. That should take care of E2000 pump and 5/16" return line. You should see solid 13 to 14 PSI. Stock regulator can handle 40 PSI pump without too much trouble.

2) Non functioning CTS or an open ground lead will cause rich condition.

3) I am going to assume that you have cast iron (CI) exhaust manifolds - these should be adequate to keep your O2 hot (around 600F), but a full length exhaust system should be put in eventually.

//RF