No I dont. I wish I had the extra money to get a tool to tell me the error's that's going on.
No I dont. I wish I had the extra money to get a tool to tell me the error's that's going on.
yeah ditch the EEC and grab a 7730 lmao. jk. ever tried EECtuning.org?
Most auto parts stores will do that for ya...Originally Posted by Ruffy
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
Some questions. What is your fuel pressure? What injectors? What EECIV manual (A9L) or auto (A9P) or something else? Is it a manual or auto tranny? Do you have a VSS wired in?
If you are using a manual ECU with an auto tranny and no VSS you will get those stalling issues like you described. I had this issue when I switched over to an auto tranny. I switched to the auto EECIV and it worked good with no VSS. It still idles down pretty far when coming to a stop but doesn't stall. This is on a 5.0 though. How did you get the pip signal from the caddy ignition?
You can pull codes with a paper clip or jumper wire. You can also use a test light in place of the VOM. This diagram is from the Charles Probst book:
And, may be a stupid question, but did you modify the Injector harness to acommodate the Caddy firing order? Also, make 100% sure that you have the Hegos on their correct banks? Questions from my past experiences, I started on mustangs. Also, did you pull the system from a mustang, or is it a set up that you bought from someone...there are 2 firing orders for ford 302's.
Firing order of a 302 won't effect how a Caddy 4.9 runs. ;)
The man who says something is impossible, is usually interrupted by the man doing it.
even though the EEC has sequential injector pulses?
To me "firing order" is ignition side.
"Injector order" is different. ;)
The man who says something is impossible, is usually interrupted by the man doing it.
Back to the VSS thinger. No mine isn't plugged in nor is the speedo plugged in. I think that VSS has 4 or 5 wires and is a round shape plug. The funny thing is not only coming at a stop does it do a low idle but also going down the highway it boggs some times like its not getting much fuel. Would the VSS wire do that also?
I doubt it. I do not have a VSS at all and I have no other issues. My setup is on the engine that it was designed for though. You have such an odd combo of parts its hard to trouble shoot anything without the ability to datalog. I am curious why you didn't just use a GM EFI system.
Yea it would of been nice to have the computer and all GM instead of the Ford swap. The guy that built it said he did it for better performance. The stock GM one lagged a little and the throttle body is smaller so that's why he changed it.
I joined just so I could reply to this thread. But after having taken a look around I think I may throw my 2 cents in a few more places here. :)
Anyway, the problem Ruffy lies in that if you are using the stock Tune on the EEC-IV for that Caddy motor you have to know that that tune was specifically written for a 302. Things like Injector Slopes, Injector Break Points, Throttle Body Air Flow, MAF Xfer table, Injector Timing, Intake Fill Rate(and a few I know I'm missing) all play in idle quality. Simply that EEC-IV was not designed to work on that motor even if you have all the correct Sensors and Injectors. The Air Flow design of that engine is going to be way off from that of a 5.0HO. You will need a EEC-IV Emulator chip like the QuarterHorse so the tune can be modified if you plan on keeping it.
See: http://www.moates.net/quarterhorse-for-fords.html
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