97 Z28 350 backfiring
Thread Starter
Teching In
Joined: Mar 2018
Posts: 8
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From: ALABAMA
97 Z28 350 backfiring Just got my engine back from Speed Shop got motor back in car tried to crank it Backfired 2 times did not try to start. So yesterday i tried to start it again never tried to start at all. All it did was shoot about a 1 1/2 foot flame out the passenger side header and the driver side header little smoke come out it. Could someone tell me what the problem is. Thanks
Most likely it is a timing problem. Either the timing chain or the optispark or both are not clocked right. It could also be the rotor on the optispark has come loose. Do a search on this forum. All kinds of info.
Thread Starter
Teching In
Joined: Mar 2018
Posts: 8
Likes: 0
From: ALABAMA
Everything on the motor is new. The heads were done by Lloyd Elliott I had the LE2 370 to 410 rwhp and TB 58mm. Got my TB from Arizona Speed Marine. Had it bored 30 over 1.6 roller rockers comp cam long tube pacesetter headers. I have checked the plug wires 4 or five time they are right. The motor was never crank there I got it and had to put intake on it. Ever thing on this car is new even gas tank fuel pump relay and fuel pump. I have trick flow 36LB Injectors and Moe at MoreHorsePower did the computer. Thanks for the feed back.
If things are not installed right then it doesn't matter what is new. What you describe leans towards a timing issue. The valves adjusted correctly? May want to check those as well.
