Waste wages.

[wasted wages]

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it looks naked with the wheels off. I'll be taking them tomorrow to get the new tires put on. I've also got most of the tbi stuff figured out it still seems a little hesitant to rev up at times and it feels a little weak to me but I haven't drove it yet to see how it runs on the highway. It's not backfiring so I'm not thinking it's in the distributor. The only sensor that's not new is the map sensor I may go ahead and change just for the hell of it since everything else is new. It may also need a tune in the future.

 

[Scooterwrench]

The only sensor that's not new is the map sensor I may go ahead and change just for the hell of it since everything else is new. It may also need a tune in the future.

Which ECM did you go with? Did you do an EGR delete?
Gonna take it to a dyno shop or DIY?

 

[wasted wages]

Which ECM did you go with? Did you do an EGR delete?
Gonna take it to a dyno shop or DIY?

I don't remember the exact number off top of my head but it's a 87 k20 ECM. I don't have EGR hooked up or even on the engine that could also be part of the issue. I'm most likely going to go to a tbi specialist tuning an ECM is out of my territory

 

[Scooterwrench]

I don't remember the exact number off top of my head but it's a 87 k20 ECM. I don't have EGR hooked up or even on the engine that could also be part of the issue. I'm most likely going to go to a tbi specialist tuning an ECM is out of my territory

Probably 1227747 ECM. I thought TBI tuning was out of my wheelhouse too but I proved myself wrong. Don't be a chicken $hit, try it!

 

[wasted wages]

Probably 1227747 ECM. I thought TBI tuning was out of my wheelhouse too but I proved myself wrong. Don't be a chicken $hit, try it!

It is a 1227747. It's going to need a tune it idles all day long but backfires out of the exhaust under light throttle at 1500ish rpm. I've got a 18 psi for spring on the way. I've tried advancing base timing to 6btdc with the timing plug disconnected it helped but didn't cure the issue

 

[Scooterwrench]

It is a 1227747. It's going to need a tune it idles all day long but backfires out of the exhaust under light throttle at 1500ish rpm. I've got a 18 psi for spring on the way. I've tried advancing base timing to 6btdc with the timing plug disconnected it helped but didn't cure the issue

Does it still have the four letter broadcast code on it?
What makes you think you need an 18lb spring in the regulator?

 

[wasted wages]

It does it's acsk

 

[Jimmy D]

It is a 1227747. It's going to need a tune it idles all day long but backfires out of the exhaust under light throttle at 1500ish rpm. I've got a 18 psi for spring on the way. I've tried advancing base timing to 6btdc with the timing plug disconnected it helped but didn't cure the issue

I have read advancing the timing on a tbi engine does nothing as the ecm retards it to within specs, but just how much timing correcting does it actually do is my question? In all my pre computer controlled cars bumping up the timing always perked them up.

 

[wasted wages]

I have read advancing the timing on a tbi engine does nothing as the ecm retards it to within specs, but just how much timing correcting does it actually do is my question? In all my pre computer controlled cars bumping up the timing always perked them up.

I've read that and I've also read that adding a to the base timing when you swap to vortec heads helps. I can't say for sure I'm still relearning all this tbi stuff as I go.

 

[PlayingWithTBI]

I have read advancing the timing on a tbi engine does nothing as the ecm retards it to within specs, but just how much timing correcting does it actually do is my question?

The ECM doesn't know what your initial timing is so, the only way it can retard the timing is, if it senses Knocks and goes into Knock Retard. There is a place in the .bin where you can tell it what you set your initial to but, that takes the ability to "Burn" a new calibration.