Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Ping when secondaries open up

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da_raabi:
Von- Thanks for the comment on EGR. Fortunately EGR has been disconnected (along with pretty much every other emissions device) since before I purchased this truck. The serious ping is only since the rebuild, although it did ping just a little in certain circumstances before.

Cliff- I pulled apart the secondary flaps and found that the plastic cam was actually broken. It was actuating the rods, but probably not quite right. I also measured the seat using number drill bits, and found that the seat that came with the rebuild kit was slightly larger than a #30 (.1285) while the old seat was a little larger than a #29 (.1360). So it is quite possible this is affecting the issue.

I don't have the funds to purchase an entirely new rebuild kit, but I'll be calling to get a new cam and a new needle/seat.

Expect a call on Monday, and hopefully that will do it!

Thanks,

Adam

Cliff Ruggles:
Sounds great, those parts will ship 1st Class Mail in a small envelope so calling will save some money there as well.  Get our blue pump seal at the same time, the one in your kit will fail sooner or later........Cliff

da_raabi:
Ok I'm back. Finally got the truck running right. I had a whole bunch of problems. Ended up buying a new rebuild kit from Cliff - what a difference.

First, the needle and seat that came in the first kit were too small. I actually measured this with numbered drill bits and found that the "new" seat was 1-2 sizes smaller than the original seat I pulled out. Cliff's kit contained a seat of the same size as the original.

Second, the secondary cam was broken. Replaced it as part of the kit.

Replaced the choke shaft and adjusted the high-speed idle.

Installed fatter main jets.

Adjusted the timing while running on the 87 ethanol fuel.

At this point I've just got a little ping in when I get into the secondaries. I'm going to try fattening up the rods and see if that helps. Otherwise this truck runs better than it ever has. It starts easy (still needs a tiny bit of choke adjustment though) and idles/accelerates awesome.

I can tell you... I'm already loving the 70 cents per gallon savings of going with 87 octane E-10 over the 89 Octane E-0. Haven't noticed any performance drop either.

I'll post up results after I get the new rods installed.

I think I finally beat the quadrajet blues!!!

Cliff Ruggles:
Good news.

We stock DA and AX secondary metering rods.  I'll bet a set of DA rods will cure the pinging issues at WOT.......Cliff

da_raabi:
Ok cool. I pulled the rods last night to double check them, and they are DR rods. I'll give you a call later today to talk about which rods would be best.

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