I swapped in a set of ford 24lb injectors onto my L98 $8d setup. Since then, the engine seems to be fighting itself when I drive it. It almost seems like it's running with a clogged exhaust, but I'm sure that's not it

I took a datalog today, but I'm pretty new at this, so I'm asking if someone can read my log and tell me what's not right with it. I have it raw CSV and cleaned up XLS..

http://www.ubertux.net/ecu/


Thanks!
-dperk

 

Are you burning your own chips?
If you put bigger injectors without "informing" the system you will be really rich and won't run real good.
I haven't check out the files yet.
Where are you in Ohio?

 

I burn my own chips. I set the injector constant to 24 from 22. I even tried a chip with it at 25.5.


I'm just south of Cleveland.

 

Looks like you have the mechanical adjustment on the thottle body holding open the throttle to keep it idling above 800 rpm.
Lower it back unitl you see that the IAC is actually controlling the idle. Then do the reset of the the TPS and the IAc to be sure they are correct.
then do another log to see if it still surges.
As a quick look, I'd say the IAC couldn't really do its job and was just doing some throttle following.
Another note,
the BLM was actually adding fuel so the bigger injectors don't seem to be making you run rich.
Check your fuel pressure as well. I would think putting larger injectors in would cause the correction to remove fuel, not add it. The pressure may be lower than the stock spec.

 

Nice and hot today, Any luck ?

 

not yet. I double checked all my connections. I will try setting the manual adjustment on the throttle linkage in more and reset the TPS.

When I installed my AFPR, I set the pressure with the engine at idle to 40 psi. Is that the wrong way to set the pressure? Should I have the vacuum line removed and the engine at idle?

 

U want to set your fuel pressure with the vacuum line off to 43psi.

Should be 38 line on and 42-44 line on range , give or take a pound.

My best setting for SVO #24 inj has been 23.8. This is on my GTA with stock regulator and stock everything except catback exhaust.

Keeps the BLM right about 124-126 range when warm.

Also, like JP86 mentioned, making sure you TPS/IAC/ base idle screw/base timing are correct can pay u back with huge dividends, especially at low speed driving.

Reset/adjust as necessary and repeat the process as required

later
Jeremy