Hello guys its been a few weeks since I last posted but am having problems and need some final advice on things. Engine is a 350 sbc dual plane intake with a hydraullic roller cam etc. Engine and all parts are all new clear down to the last bolt. Problem is engine will run and start up and runs fine some times and other times it does not. When you give it gas and it runs right it will rev nice and fast with no problems. Then when it does its problem that its doing if you rev it it will fall flat on its face and will want to die and will not want to run and you have to like fight it too keep fighting it to keep going. Some times it wants to drop a cylinder or two and then refire up and plugs are getting fowled out cause the engine does not want to stay running and all these problems.
When it is running fine it will stay and idle well then it will slowly want to start to die off and quit like its chocked or something. When you can get it to stay running decent it will seem to want to stall and you have to give it gas to try to keep it going. At a steady throttle it will stay running sometimes other times it does not just depends. Sometimes if you give it gas it helps and other times it wants to kill it. Ok here is a list of all that has been replaced and checked on this thing.
Two Edelbrock carburetors a 600 cfm performer and 750 performer both in excellent running condition.
One Holley Street avenger 670 carburetor brand new and floats and everyting set as it should be and ims screws all tuned right.
Two different Hei's where used and both are in excellent working condition and both have been tested at the autoparts store and everything is fine on them.
Two sets of plug wires and three sets of spark plugs where used and all are new.
Ignition wire to hei where all checked and 12 volts are being supplied
New gas tank and original fuel sending unit installed.
All new fuel line.
Two brand new mechanical fuel pumps where used and have correct fuel pressure of around 5-6 psi.
New alternator has been installed and checked.
New vacuum lines have been installed and all checked out fine and no cracks and carb cleaner sprayed around intake manifold and no leak around carb base or in front or back of intake. There is no hint of a vacuum leak and vacuum is steady at 14-15 hg (performance cam)
Ok guys after all these things have been checked and after all the different things swaped out for the process of elimination it still wants to do this and don't know else to do here. All electriacl stuff and fuel stuff has been checked out and replaced with new stuff to troubleshoot here. Everything is what it's supposed to be and timing was dead on and nothing else was ever messed with.
Any suggestions here? When you can get it out it will run good then bad then good then bad again it will rev strong then will just fall flat and there is no pattern it just happens when it wants too. Hope to hear from someone here. My Dad has worked on cars for over 30 plus years and hes know's it all pretty much and he is just baffled with this mystery.
Thanks guys
Eric
When it is running fine it will stay and idle well then it will slowly want to start to die off and quit like its chocked or something. When you can get it to stay running decent it will seem to want to stall and you have to give it gas to try to keep it going. At a steady throttle it will stay running sometimes other times it does not just depends. Sometimes if you give it gas it helps and other times it wants to kill it. Ok here is a list of all that has been replaced and checked on this thing.
Two Edelbrock carburetors a 600 cfm performer and 750 performer both in excellent running condition.
One Holley Street avenger 670 carburetor brand new and floats and everyting set as it should be and ims screws all tuned right.
Two different Hei's where used and both are in excellent working condition and both have been tested at the autoparts store and everything is fine on them.
Two sets of plug wires and three sets of spark plugs where used and all are new.
Ignition wire to hei where all checked and 12 volts are being supplied
New gas tank and original fuel sending unit installed.
All new fuel line.
Two brand new mechanical fuel pumps where used and have correct fuel pressure of around 5-6 psi.
New alternator has been installed and checked.
New vacuum lines have been installed and all checked out fine and no cracks and carb cleaner sprayed around intake manifold and no leak around carb base or in front or back of intake. There is no hint of a vacuum leak and vacuum is steady at 14-15 hg (performance cam)
Ok guys after all these things have been checked and after all the different things swaped out for the process of elimination it still wants to do this and don't know else to do here. All electriacl stuff and fuel stuff has been checked out and replaced with new stuff to troubleshoot here. Everything is what it's supposed to be and timing was dead on and nothing else was ever messed with.
Any suggestions here? When you can get it out it will run good then bad then good then bad again it will rev strong then will just fall flat and there is no pattern it just happens when it wants too. Hope to hear from someone here. My Dad has worked on cars for over 30 plus years and hes know's it all pretty much and he is just baffled with this mystery.
Thanks guys
Eric
O well here we go again at least this time if I have any issues what so ever I know its the carb period.
