720World

Little Trucks, Big World

finally getting back to work on truck. 1984 720 king cab with Z24 auto trans.  Engine will start and run but only responds to first little bit of throttle then nothing, getting fuel mist blowing back through carb.

problem started slowly and progressed over a 2-3 week period when it became unsafe to drive on road

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1/  Head gasket blown between two cylinders. By no means definitive, if you find two adjacent cylinders low this could be the cause.

2/ Valve lash is too tight. Intake most likely.

Is it possible that the CAT is plugged up?

My Cat was partially clogged up,was making noise at exhaust 3 and 4 cylinder,both plugs were toasted,the head gasket was blown between cylinder  3 and 4.But I didn't lose power,took it to Jack,he's the one that installed the Jasper engine.My front pipe needed replacing also,when he took off,he noticed that the cat was clogged,part of the inside came apart and was partially blocking the flow.He recommended not putting another cat on it,we don't have smog test here,he also has a 720 truck.You will need to remove cat and look at both ends cause one end may look good but the other may be clogged,that's how mine was,plus it gave me more power without it and I went from 18 mpg to 20 mpg on my 4x4.

need to replace exhaust system from just before cat to tailpipe

will have to get gage and check cyls was running good then just went downhill over a few days

well checked cat not the problem. engine will rev to 1300 rpms then nothing more. will get gage this weekend and check compression. carb is rebuild from guaranteed carbs??? too much stuff to do around the house not to have it running. it idles fine 

It may be time to upgrade your carb.I put a Weber on mine long long time ago,us in Georgia have no smog test so we can let it all hang out,lol.I am down the road from Columbus,mine is a 85 and your's a 84,somewhat different in somethings.Here's where I got mine from,I have bought a idle cut off solenoid to make it idle right,you need it too,trust me.Also here's a video of my conversion,your's maybe a little different.

Could it be an ignition issue? Put a timing light on it and confirm that you have proper advance when you throttle it up. You must have proper spark advance for the engine to rev up in rpm. I would verify that.
Change fuel filter if you haven't lately.

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