Are cammed cars always harder to start?
01-11-2012, 08:37 AM
#41
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Totally different car but my ls6 ctsv did the exact same thing as in your videos. A month later my starter went bad. I replaced it and haven't had the issue since.
01-11-2012, 08:45 AM
#42
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A weak check valve in the fuel pump is notorious for causing long crank times in GM cars, next time try priming the fuel system and see if it fires right up. Prime it by turning the key on for 3-4 seconds, back off for 3-4 seconds, then back on again for 3-4 seconds, that will build up fuel pressure, then crank it and see if it fires right up.
It could be several things, but on a GM with a long crank complaint I always start there.
FYI what happens is the check valve in the pump goes bad and lets all the fuel drain out of the fuel line back into the tank so when you hit the key the pump has to fill the line and build pressure, that isn't immediate. If the check valve is good the line stays full of fuel and the pump can pressurize it very quickly.
It could be several things, but on a GM with a long crank complaint I always start there.
FYI what happens is the check valve in the pump goes bad and lets all the fuel drain out of the fuel line back into the tank so when you hit the key the pump has to fill the line and build pressure, that isn't immediate. If the check valve is good the line stays full of fuel and the pump can pressurize it very quickly.
02-28-2012, 06:21 PM
#47
Well I still haven't tested it with a fuel pressure gauge, however, if you prime the pump or even run the car and shut it off and press on the shrader valve on the fuel rail nothing comes out. I think this alone pretty well confirms the check valve is bad. I'll just think of it as a forced upgrade. 
11-23-2018, 09:05 PM
#48
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My car was a forged 347 with prc 5.3 stage 2.5 heads milled for 11.5:1 compression with a 235/240 112+4 cam and a ported FAST 92 combo and would fire right away everytime. As ive seen with the setups ive had its all in the tune. Cunningham Motorsports specd my cam and also tuned it.
