1985 Corvette Problems
Drifting
Joined: Mar 2017
Posts: 1,897
Likes: 164
From: Nashville TN
2017 C4 of Year Finalist
are you familiar with the ninth injector? Previous owner might have removed it. Mine was leaking so I deleted mine. Takes a little extra cranking to get her started now. It's on the drivers side and injects directly into the plenum-look for a small metal hose coming off the back of the fuel rail to the injector. If it's not there, that could be causing your long crank time. That injector is only on the old C4s, it shoots a small amount of fuel directly into your intake, kinda like spraying starter fluid into the intake, to get things started more quickly. You don't have to have it (they tend to leak after a while) and you can't buy a new one, to my knowledge.
Just a thought.
Just a thought.
Instructor
Joined: Mar 2017
Posts: 111
Likes: 12
are you familiar with the ninth injector? Previous owner might have removed it. Mine was leaking so I deleted mine. Takes a little extra cranking to get her started now. It's on the drivers side and injects directly into the plenum-look for a small metal hose coming off the back of the fuel rail to the injector. If it's not there, that could be causing your long crank time. That injector is only on the old C4s, it shoots a small amount of fuel directly into your intake, kinda like spraying starter fluid into the intake, to get things started more quickly. You don't have to have it (they tend to leak after a while) and you can't buy a new one, to my knowledge.
Just a thought.
Just a thought.
Advanced
Joined: Feb 2017
Posts: 86
Likes: 4
From: San Antonio, Fl Florida
Pulsator damper
I fought this one for many years and was not happy about it. two fixes for me. I had a couple of leaking injectors - replaced all. the second problem is that my fuel pressure was not holding to spec after shut off. After a complete search and change out of the entire fuel system, i found it was a ruptured fuel pulsator damper - it's just upstream of the fuel pump (note the troubleshooting manuals dont mention this thing as a potential pressure issue source). You can replace this little piece with straight fuel hose - pressure problem now solved and my hard starts when warm are now much much better. hope this helps.
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 763
For the hard starting folks there is a fuel temp sensor on the front of the engine, check and clean or change it. It could cause the problem too. My 85 starts when the key is put to run any time(167000) so something is out of wack.
Last edited by Joe C; Jul 27, 2017 at 05:41 AM.
Instructor
Joined: Mar 2017
Posts: 111
Likes: 12
