Are cammed cars always harder to start?
#21
ok lately my car has been doing the same thing where is takes a second or 2 longer to start up, unless i prime the ignition a few times it fires right up as normal and i was just wondering where is the fuel check valve and the fuel filter on a 98 ls1 camaro?
#28
That i dont know once you fill up your tank to full put 2/3rds of it in the tank. People say a full can but i jsut did 2/3 and it worked great. It wont hurt anything. The problem is people putting it through the brake booster. Through the tank is fine. That should help.
#31
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After watching video, I can tell you its not a battery/starter issue as its turning over perfectly fine. Thats more of a plug/coil/fuel issue. Check the fuel pressure at the rails, replace the plugs with some tr55's and see how it starts after that.
#32
I suppose I'll look into a fuel pressure gauge. If that passes, then I suppose I'll look into getting it re-tuned.
#33
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It has brand new tr55s in it and msd wires. Before that it had semi old tr55s in it with stock wires and it started the same as it does now. It also has a new wix fuel filter, stp paper filter, and freshly cleaned maf for what it's worth.
I suppose I'll look into a fuel pressure gauge. If that passes, then I suppose I'll look into getting it re-tuned.
I suppose I'll look into a fuel pressure gauge. If that passes, then I suppose I'll look into getting it re-tuned.
#34
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Well I took a cold start video yesterday morning without any priming of the fuel pump. Then I took another video this morning after priming the pump 4 times as 00pooterSS instructed. Both in the morning after sitting for 15 hours and both @ ~35* F outside. As you'll see, they're almost identical.
Couple of things, in your first video the key was already in the "on" position when you started it. If the check valve is really bad it won't hold a prime. When you turn the key to on the pump comes on and primes, if you let it sit for a few seconds after the pump ran and the valve is real bad it will lose the prime that fast.
I agree it sounded the same in both however and not being there it is hard to say.
It still kinda seemed like fuel or the tune (air/fuel mixture). Since when it did fire it fired up and ran decent (didn't stumble and miss etc) I doubt it is anything other than something to do with fuel, whether it be pump or tune.
That's a good question, if they are worn or gapped wrong it makes it hard to light off the fuel on a cold start.
Wires would cause it to misfire, not a delayed start. Seafoam won't improve this symptom much if any.
I concur!
#35
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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.
#36
ok here we go sorry dont mean to take over thread here,
Starting when it acts up:
http://www.youtube.com/watch?v=n9xlP...UmZTgPmMmVrm2o
Starting when it acts fine:
http://www.youtube.com/watch?v=sdsAs..._order&list=UL
from the sounds of it im thinking it has to b something with the fuel pump and all because i just put a new fuel filter on, that didnt help, and it dosent do it everytime just sometimes. so i leaning more towards the check valve and pump.
Starting when it acts up:
http://www.youtube.com/watch?v=n9xlP...UmZTgPmMmVrm2o
Starting when it acts fine:
http://www.youtube.com/watch?v=sdsAs..._order&list=UL
from the sounds of it im thinking it has to b something with the fuel pump and all because i just put a new fuel filter on, that didnt help, and it dosent do it everytime just sometimes. so i leaning more towards the check valve and pump.
#40
TECH Veteran
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ok here we go sorry dont mean to take over thread here,
Starting when it acts up:
http://www.youtube.com/watch?v=n9xlP...UmZTgPmMmVrm2o
Starting when it acts fine:
http://www.youtube.com/watch?v=sdsAs..._order&list=UL
from the sounds of it im thinking it has to b something with the fuel pump and all because i just put a new fuel filter on, that didnt help, and it dosent do it everytime just sometimes. so i leaning more towards the check valve and pump.
Starting when it acts up:
http://www.youtube.com/watch?v=n9xlP...UmZTgPmMmVrm2o
Starting when it acts fine:
http://www.youtube.com/watch?v=sdsAs..._order&list=UL
from the sounds of it im thinking it has to b something with the fuel pump and all because i just put a new fuel filter on, that didnt help, and it dosent do it everytime just sometimes. so i leaning more towards the check valve and pump.
Again, the check valve is in the fuel pump. I cannot begin to count how many GM fuel pumps I have changed for this exact reason. Two things can cause fuel drain back/not hold prime. Pump check valve or regulator, we have returnless systems so it's near impossible to test the regulator. If we had fuel rail mounted regulators I could tell you how to eliminate that from the equation. You said when you prime it it fires right up didn't you? If so put a pump in it. Mine did it, my best friends chevy truck is doing it now, and many many customer cars have done it. On GM's it was always the pump. I have changed pumps on many other makes of vehicles too for the same exact thing.
If you guys will go get a fuel pressure tester, rent one or buy one, you could narrow this down so easy. Hook up the fuel pressure tester to the test port on the end of the driver side fuel rail, prime the system and watch the gauge, the fuel pressure should hold or fall extrememly slowly, and I mean take many minutes to loose 10 or so pounds of pressure. If you watch that gauge just drop or drop multiple pounds in a few seconds to a few minutes... you are seeing the gas drain back into the tank so the pressure drops. The pump has to repump the fuel back up to the rails AND pressurize it before it will crank right up. That is the number one cause of extended crank times, no fuel pressure or fuel in the rail at start up.
If it is something that it has done ever since a tune change or engine parts change, check the tune. If it started out of the blue, check fuel pressure drop..