why do stock carbs have a computer plug

[TURNA]

As well as a lock up kit for your trans.

Why is this?

The Electric Q-jet depending on the year car and where it was built effect the trans lock up.

 

[Minion1186]

with overdrive 2004r's the tcc system is hooked to the computer. Taking the computer away takes the ttc and overdrive of the trans away, the cure for this when removing the computer is to get a tcc lockup kit.

 

[FE3X CLONE]

with overdrive 2004r's the tcc system is hooked to the computer. Taking the computer away takes the ttc and overdrive of the trans away, the cure for this when removing the computer is to get a tcc lockup kit.

Removing the computer only effects the TCC lockup. It does not take way your 4th gear (overdrive).

 

[DoubleV]

"3) The EGR valve. Technically you don't NEED it, but the computer is calibrated for use with EGR, so keep it on or you'll get part throttle pinging."

the EGR allows exhaust to re-enter the combustion chamber which reduces the cylinder temperature...removing or disabling it creates higher cylinder temps which can cause the pre-ignition pinging. Also without it you'll have higher readings of NOx if your worried about emissions

If this was directed at me, I'm not sure why you posted this. I know how the EGR works and what it's purpose is. The ECM adds extra timing advance during the times the EGR is working. If you delete the EGR, the ECM will still apply extra timing advance during part throttle because it doesn't know the EGR valve is missing. This can cause pinging. This is why I said the computer is calibrated for use with EGR.

 

[DoubleV]

does anything need to be capped off once you remove the vacuum lines?

It's pretty self explanatory. If you have a 'device' that has a vacuum line going to it and you remove the 'device', you're left with an open vacuum line which then needs to be plugged.

 

[DoubleV]

I never had a decent 307 run "right", something was always amiss with them. My cutlass supreme had a slight missfire and my cutlass salon had a super lean condition, ran almost ok with a 442 dual snorkel on it but ran like sh*t with an open element air cleaner on it. I tried richening up the secondaries with different rods,a different hanger and grinding down the air valve door stop so the flaps open up 100 percent rather than 50. If it's not running right chuck the electric q jet,ccc distributor and dehose the engine bay. I would then grab a new remanned q jet or a good used one and put any olds HEI distributor in it from 1979 and down and it'll run a whole lot better. I have done this a couple times and from experience the 307s got a little more peppier as opposed to when the ccc junk was on it.

You can't really blame the CCC system design ( or call it junk ) just because your cars didn't run right. If they ran poorly that's a maintenance/tuning issue. A service manual would've helped you correct whatever your problems were, but you felt it was easier to just chuck it. Some people like to do things differently I guess.

Mind you I've seen CCC cars run like crap too. That's a maintenance and/or tuning problem, not a design problem. I've seen CCC cars run incredible as well. How is this possible? Easy, everything was tuned and working properly. No voodoo magic at all!

 

[pontiacgp]

"3) The EGR valve. Technically you don't NEED it, but the computer is calibrated for use with EGR, so keep it on or you'll get part throttle pinging."

the EGR allows exhaust to re-enter the combustion chamber which reduces the cylinder temperature...removing or disabling it creates higher cylinder temps which can cause the pre-ignition pinging. Also without it you'll have higher readings of NOx if your worried about emissions

If this was directed at me, I'm not sure why you posted this. I know how the EGR works and what it's purpose is. The ECM adds extra timing advance during the times the EGR is working. If you delete the EGR, the ECM will still apply extra timing advance during part throttle because it doesn't know the EGR valve is missing. This can cause pinging. This is why I said the computer is calibrated for use with EGR.

I was pointing out another issue with removing the egr....that is why I posted it...

 

[DoubleV]

"3) The EGR valve. Technically you don't NEED it, but the computer is calibrated for use with EGR, so keep it on or you'll get part throttle pinging."

the EGR allows exhaust to re-enter the combustion chamber which reduces the cylinder temperature...removing or disabling it creates higher cylinder temps which can cause the pre-ignition pinging. Also without it you'll have higher readings of NOx if your worried about emissions

If this was directed at me, I'm not sure why you posted this. I know how the EGR works and what it's purpose is. The ECM adds extra timing advance during the times the EGR is working. If you delete the EGR, the ECM will still apply extra timing advance during part throttle because it doesn't know the EGR valve is missing. This can cause pinging. This is why I said the computer is calibrated for use with EGR.

I was pointing out another issue with removing the egr....that is why I posted it...

Gotcha. I thought you were implying my quote was BS since I didn't really make any mention of how the EGR works.

 

[pontiacgp]

Gotcha. I thought you were implying my quote was BS since I didn't really make any mention of how the EGR works.

nope...wasn't doing that.....another thing if someone wants to disable the EGR they may want to consider removing the intake and to stuff the egr port in the head with steel wool so the hot exhaust won't heat up the intake which could affect the fuel

 

[dougfather]

Of course, some of us who have done the infamous 231 V6 to V8 swap often times delete the CCC. Reason being in my case was the simple fact it is nearly impossible to find a good V8, CCC, wire harness junkyards around here (let alone g-bodies). Add to that, the CCC Q-Jet's are often left exposed in the weather and their condition is questionable.