ZR-1 Net Registry Forums - View Single Post - 91 ZR-1 Cutting Out Under Load

george henry · 10-20-2006

My 2 cents: My '90 had a similar problem, cutting out (missing) under load when the engine was hot (all was fine with cold engine). Did all the usual and simple stuff first. The guy's at the corvette shop suspected a coil breaking down when hot. My fuel pressure was 42psi on either pump or both pumps together. Should be 52-55 psi. Is yours still 32psi? not good. Under load the engine would be starving for fuel. Anyway, since the plenum was coming off, I replaced the fuel pressure regulator (pressure is now 52psi) and all four coils. Problem gone, I can now do 180mph again. Regulator was $125 at GMPartsdirect.com.

Good luck

10-20-2006	#59
george henry Join Date: Aug 2006 Location: San Diego, CA Posts: 24	Re: 91 ZR-1 Cutting Out Under Load My 2 cents: My '90 had a similar problem, cutting out (missing) under load when the engine was hot (all was fine with cold engine). Did all the usual and simple stuff first. The guy's at the corvette shop suspected a coil breaking down when hot. My fuel pressure was 42psi on either pump or both pumps together. Should be 52-55 psi. Is yours still 32psi? not good. Under load the engine would be starving for fuel. Anyway, since the plenum was coming off, I replaced the fuel pressure regulator (pressure is now 52psi) and all four coils. Problem gone, I can now do 180mph again. Regulator was $125 at GMPartsdirect.com. Good luck