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A buddy of mine has a 97 Camaro with an LT4 350 in it, and it ran fine yesterday but today it just won't crank. It turns over really fast but it won't even try to start. He is gettin spark, and i'm not sure if he's gettin enough fuel but when he tries to crank it, i can smell it. Any suggestions?
What's an LS4 350?
lt4 is what he means. lt1 camaro with lt4 heads and intake. are you sure it is firing at the plug and not just going into the opti? if the waterpump starts leaking it will run into the opti and do just like you are describing but there is no fire at the plugs.
That's possible, but I've never heard of them going from fine to not working in one day. Usually the car will start having a miss that gets progressively worse when the opti goes out.Quote:
Originally Posted by youngun
The fuel pump is a common issue with these cars. Can you hear the pump prime when you turn the key to "run"? If so, throw a fuel pressure gauge on it to see if you're getting fuel to the injectors.
It's gettin spark, i put a screwdriver in the wire and watched it jump to the header. and yes i meant lt4. I was thinking it was fuel and i really don't remember hearin the pump whinin.
opti spark FAIL!!!!!!!
Opti-crap possibly. There is also a fail-prone wire harness to the OS. It's like 4 or 5 wires and maybe a foot long and is $200 from GM.
if water gets in the opti it goes from working to dead as soon as the water gets in there. and the weep hole for the water pump is directly over the opti, great place for the opti. it's very common to have to replace the opti when changing the waterpump unless all water is removed from the block to keep it from getting into the opti.Quote:
Originally Posted by krwyellowZ28
you should hear the pump when you switch the car on, but get someone to take the gas cap off and listen when you switch the key on. or check the schrader valve on the fuel rail by switching the car on and press the valve core in, make sure you are not in front of it when you press the valve core!!!
Quote:
Originally Posted by GasGuzzler
If I remember right that pigtail (runs from a connection near the TB down to the opti) was only like $25 when I swapped a '94 LT1 into a '95 Z28 a few years back.
But I would still double check that the pump whines when the key is turned to run, and then check the fuel pressure at the rail... My dad tought me to check the simple stuff first.:burnrubb:
Yeah, I made that up.
LOL... sounds realistic, though.Quote:
Originally Posted by GasGuzzler
Funny thing happened Tuesday. Parts guy brings out the exact harness we are discussing...the end is all messed up. Asks me "Do you have anything like this?"....I'm like...."What, an LT1 part? No...but you can order one from GM, they used to be a problem part." He said "Yeah, I know....but it's $237 and the customer doesn't have the money"....