I am having some real trouble with my non cc qjet. it is on an 84 350 on my 1/2 ton p/u.

the choke doesnt work and the carb has developed a serious problem with higway speeds.

when I give it gas it goes then cuts out and comes back many times about once a second. I dont see any smoke from the tailpipe so I think it is lean but I have richened up the idle mixture screws as much as I can without causing idle problems and it doesnt help.

I will replace the fuel filter today.

the fuel pump has always made a loud noise that sounds like clanking but I thought this might be normal and has not changed since the problem started.

this started when I drove it back from buffalo (6 hrs) and it wasnt so bad at first just a slight hessitation. but eventually I couldent hold the truck at 60mph as it would just kick and sputter if I tried to give it gas.

my first question is could this be happening because the exhaust crossover passages are blocked? It didnt seem like it would cause this much of a problem and ran fine for the first 2 weeks after I changed to the blocking intake gaskets.

my second question is if and when I decide to give up with it what is the best option for a reliable new carb. should I ::

a) get a replacement 650 spreadbore from holley with the same choke and everything.

b) get a square bore 600-650 holley and a new manifold.

Thanks for any suggestions either along how to fix my qjet or recomendations for a new carb.

james

 

Try the fuel filter first.

It would be best if you could get a fuel pressure gage on it to verify fuel pressure - could also be the fuel pump or clogged fuel pickup screen.

 

ok I got the fuel filter in and it helped only slightly.

I remembered that I retarded the timing from 10 degrees to 8 for the trip and tried moving it back to 10 but this doesnt help either.

While I was doing this I also noticed the reason why the previous owner had the base timing set at 20+. the timing doesnt advance at all with rpm WHICH ODDLY ENOUGH is the SAME F_ING problem Im having with my trans am!!!!!!!!!!!!!!!!

ARRGGGG I hate computers and electronics. they dont belong on motors.

well that is a bit rash I am just having a bit of bad luck with them....

ok so I got a fuel pump and I should have it on in the morning and I also got a carb rebuild kit and will do that this weekend. and I also got a mechanical/vaccuum advance dissy from summit which should go in on thurs/fri.

maybe then this thing will run ok.

 

You said in your first post it was a NON cc Q jet. Are you still using the CC dist? If so..then no wonder you're having problems, you can't do that. That might not be all of it but it sure won't help.

 

you are right of course and I have a non cc dissy on the way.

btw I changed the fuel pump this morning and problem solved totally.

thanks for the help guys I will definately have some questions when I rebuild the carb this weekend.