Hello all,

I have a non-CC Q-jet on my 350 that I believe is giving me problems. I've drove the car for the last several months with this carb (it was rebuilt by a shop in July), and had no problems. I drove the car as recently as last night for about 40 miles with no problems at all.

I go out this morning to start it up, and the car starts and barely runs. You have to hold it to the floor to keep it running, and even then it only will turn about 2200 rpms, and eventually either it bogs itself down and dies and backfires out the intake, or you back off the pedal and it just dies.

The ignition system has worked perfectly for the last few months, and the carb has as well. My fuel filters are both fine, and I know it's not a timing problem, as I've had this thing dialed in for a while now.

It MAY be an electrical problem, as I've got longtube headers and occasionally get something burned on them, but everything else electrical on the car works fine.

I think it's the carb, but I don't know what. I've got tuning tools if it needs to be leaned out or richened.

Any ideas on WTF is wrong with it?

 

Also, the carb will jet fuel if you throttle it, so it's apparently not a starving itself of fuel. It now will not start, just crank and crank.

 

Anyone?

 

Backfiring out the intake almost always indicates a timing problem. Check the ignition and cam timing again--no matter HOW certain you are that nothing has changed.

Also, bumping a thread every 30 minutes isn't going to get you a faster response. The carb board doesn't have anywhere near the kind of traffic the other sections do.

 

Not trying to be a PITA - but these things are usually the simplest things that are overlooked - ie plug wires. I have a plug wire that wants to back itself off just slightly - makes mine run like crap when it happens, and it's easily overlooked cause the wire is still there, just not securely on the plug. Recheck the simple dumb things again - I always forget myself, and later I feel really stupid lol.

 

Hello I have a 1986 iroc Q jet too and i have the same prob with when i start engine in the morning after it cools down. I tend to think its a carb prob choke or something of that nature. I plan on replaceing my carb to an after market so i'll keep you updated this summer

 

Q-jets are known to drip gas from the fuel bowl to the intake plenum via lead plugged passages. The usual fix is to take the carb off, disassemble enough to remove the throttle body, and clean & epoxy over those plugs.

If flooring and holding the pedal down to get it to start and run helps, you've got a flooded engine.

 

can you borrow a carb from a buddy? at least you'd know for sure whether or not the problem is in the carb

 

99Hawk120 was right on this one.

It apparently had jumped a tooth on the dizzy and was pretty retarded. The hold down bolt was still down tight....kinda odd, but pulled the dizzy and retimed it, no problems since (except for the bogging thing mentioned in the other thread).

As for my impatience, I had a family friend's funeral that morning that I ended up missing, thus the impatience.

 

Good to hear that you got it fixed. No worries on the impatience thing, we all do it sometimes.