wires to injectors look pinched and burned.

 

Obviously. This is the connection to the hose that goes to the air-cleaner. It would be hard to have a hose there with the air cleaner off. And yes, when we test it, it still surges with this port plugged.

 

The injectors work fine, still doesn't explain surging

 

Just from the pix ...... it would seem due to condition on overall cleanliness, I would pull the TBs, clean them up and put in all new gaskets / seals etc .....
The EGR needs to be replaced ...... I would be totally amazed if it functions at all considering its condition .....
would certainly check all the wiring in the clean up process to make certain of their condition ....
Its very difficult to diagnose small issues with the current condition of your system .... it's a little time consuming .... but well worth the effort .....

keep us informed ....

 

We already pulled the TBIs and cleaned them up with new gaskets. They work fine, the injectors pulse great and the spray is constant.
I agree about the EGR, we will mess around a little more with that today. The thing is, when you plug the ports for the egr, it still surges...

 

what do the plugs look like ?are they burning good?

 

To do a proper diagnosis of this you need:

a. A vacuum gauge, maybe even a vacuum pump
b. An adjustable/variable timing light w /rpm
c. A pad and paper
d. A helper
e. Patience

Sure the cam's not wiped?

Not to be an azz, but if it were mine I'd yank it either go back to carb or move up to TPI

 

here is what I would check next.....
1-fuel pressure, you should have at least 13 psi fuel pressure in the system. best place to check is between the TB's. but you can also check at the fuel filter.
2-recheck spray pattern of both injectors, making sure that both have umbrella spray pattern, and not a drip pattern at anytime.
3-you replaced the fuel pump, did you also replace the hoses along with the pump? and if you did, the small rubber hose that actually sits in the fuel, needs to be fuel resistent hose, otherwise it will rot in a matter of days.....and can cause your surge condition.....
4-check 20 amp fuse near battery, take fuse out, make sure there is no corrision in the connection, also check ECM connections for any type of corrision, etc..
5-if the above checks out and you still have a problem, change fuel filter again, you may have build-up of "junk" in the fuel line from the pump to the fuel filter, that has not worked it self out. get a container and with the filter removed,run the pump, making sure the fuel coming out is clean and clear.

on my friend's 82, he skipped #1, but did #2,3,4 and that solved his problem of a no-start condition, and rough idle. he then developed almost same condition a week later and did #5 and his engine is running just fine.
on my 82, my idle is getting better with each little item I do. although I don't have a surge condition like yours, my idle does fluctuate slightly, but runs great. the dash and guages are still out of the car, thus the speed sensor is disconnected, which contributes to the idle as it tells the ECM if the car is idling or in motion to make the necessary adjustments.
before you would attempt to balance the TB's, I would check and make sure that the TB plates both open and close exactly the same time. If they do, I would say that the TB's are probably balanced and would not attempt doing this at this time. I would concentrate on the above to eliminate every possible item that may be causing your condition.
all-in-all, the CFI is a great motor, I get great mileage with mine as my "dd". You just have to understand how it works, (which I am learning myself) and it will run forever when set-up properly.
hope this helps................................... ........Tom


although this may seem irrelevant, make sure your battery and alternator are in top shape and putting out the charge they need to be......also make sure your grounds are secure.....

 

i would add beer

 

My 1982 Corvette crossfire injection seems to run ok but when I tried to balance out the injectors I get no vacuum at idle. any thoughts?

 

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