Modifying an E4ME

[82ELCAMINO]

Hello Cliff,I purchased your book some years back with the intentions of getting a little more knowledge about these very surprising little gems,the Quadrajet.I know my little carb that could or might,may have a peppy future in store for it.Mine is a CCC p/n 17082204,on top of a 305.You mention on page 14 of your book that once I were able to remove and modify the electronic equipment correctly,the E4M's make excellent performers.How would this be done,is that the only thing I could do to this carb to give it a lot more.Yes I know it's on an anemic little boat anchor,but it's ours and it's paid for.lol I should probably add that it does run really well,starts easily once the fuel is at the carb (drive it occasionally in summer).Thank-you in advance.

[Cliff Ruggles]

Keep in mind when working on a CCC carburetor that the ECM only controls part throttle fuel delivery.

Idle, heavy and full throttle are not computer controlled.

They use an M/C (Mixture Control) solenoid to do this.  The ECM is fed information from the TPS, MAP, O2, etc just like many later TB and FI systems that followed.  It will adjust the A/F ratio within it's limits when driving.

If you are trying to use one outside of it's original application or without an ECM and all the related hardware the stock jets/metering rods and M/C solenoid can be removed and set up to run straight off of the jets.  Remarkably if you choose the correct jet size they work very well like this as the carburetor by design will increase fuel delivery based on engine load, throttle position, vacuum, pressure differential above and below the venture areas, etc.

Of course without a power piston and primary metering rods the control woln't be as precise, but I've actually fixed MAJOR issues with later vehicles using those carburetors by setting them up in that manner........Cliff

[82ELCAMINO]

Thanks Cliff for your response.Our emission police here in Ontario have been fairly visible in recent years and I have heard rumours of spot checks in the past.Now from what I just read from a gov't site on this ,we are to keep all emission related parts.

So if I were to stick with the M/C solenoid,is there a way to gut the hidden parts of the M/C solenoid and use  only the jets ,or is that a useless way to go and use the correct chosen jet size whatever that may be.

If I remember correctly I think I read somewhere that the APT on these carbs could be adjusted to provide control of the part throttle a/f mixture,would that overide the function or mess with the ECM.

With having the later APT system doesn't it have a power piston, I may not be understanding correctly as I'm green in this field.

Could I just focus on the secondary side to get more full throttle by changing metering rods/jets and can the secondary cam be changed to raise the rod up further or is that even needed? In regards to my secondary side it seems like it's underpowered or there just isn't that pull you back in the seat feeling,or maybe just the lack of cubes is the issue.

[Cliff Ruggles]

ALL modifications would be internal so it would easily pass a visual inspection....

[82ELCAMINO]

That's comforting to know,thank-you Cliff for your time I appreciate it.I'll be waiting for the weather warm up a bit so I can tear into this more.Cheers.

[tayto]

no one will know the difference unless you pull the air cleaner off and actually know what you're looking for. funny that ontario is tightening the noose on older vehicles... BC (vancouver) recently got rid of "aircare" and now we have no emissions testing. the reason being old cars are just not on the road anymore.