opti related?
Thread Starter
Joined: Oct 2005
Posts: 1,687
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From: Fairfax, Virginia
opti related? My car starts up fine and doesn't have any problems until it fully warms up. Then when it starts to sputter, and I give it more gas, it will backfire. Usually sputters when its shifted into 3rd or 4th and stays in gear when slowed down (30-45mph). Sometimes it will hesitate off the line driving normally too. At first I was thinking it was a air/fuel problem. But why would it happen only at warm-up. Also, it's progressively getting worse. All this started happening months after my header/exhaust install. My car has never stalled or failed to start up. Does any of this sound like the opti starting to go bad, or air/fuel ratio?
my dads 94 formula had the SAME problem, after we put a new coil,opti, and plugs it died and we couldnt get it started, long story short we had it towed to dealer and it was the fuel pump! if you've got a fuel pressure tester id check the fuel pressure, you can buy one at advance or autozone for like 30 bucks. does it sound like its backfiring from the intake?? i was amazed that it was the fuel pump i was ready to tear it down and check timing...
Thread Starter
Joined: Oct 2005
Posts: 1,687
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From: Fairfax, Virginia
Originally Posted by Cammd95Z
does it sound like its backfiring from the intake?? i was amazed that it was the fuel pump i was ready to tear it down and check timing...
never starve a 4th gen fbody of fuel, especially the lt1's you are just asking for problems. they require fuel to keep themselfs cool ... no fuel, big problem. Right now Summit has a sale on the Granatelli fuel pumps for 90 bucks ... good deal. As far as it happening when the car warms up that is a symptom of the opti ... notice anything else? harder to start? rough idle? it is always a good idea to do a tuneup before going to the opti ... plugs, wires, fuel filter, and if it breaks up in higher rpm it could even be the coil. if everything has been changed recently sounds like it could be the opti.
Thread Starter
Joined: Oct 2005
Posts: 1,687
Likes: 0
From: Fairfax, Virginia
Originally Posted by titter
never starve a 4th gen fbody of fuel, especially the lt1's you are just asking for problems. they require fuel to keep themselfs cool ... no fuel, big problem. Right now Summit has a sale on the Granatelli fuel pumps for 90 bucks ... good deal. As far as it happening when the car warms up that is a symptom of the opti ... notice anything else? harder to start? rough idle? it is always a good idea to do a tuneup before going to the opti ... plugs, wires, fuel filter, and if it breaks up in higher rpm it could even be the coil. if everything has been changed recently sounds like it could be the opti.
My car starts up perfect. Idles fine too. The only time it seems to idle "bad", would be after the car has sputtered and backfired a few times, THEN it would idle at 500 rather than the normal 600rpm. The sputtering occurs from idle to around 3K rpm.
If I give it a little gas, and the needle doesn't move at all, does that mean a opti problem? cause sometimes on the highway, I give it gas and hear my car rev, but the needle and car won't move.
Lastly, I'm getting my car dyno tuned next week. Should I take it as is, or replace something first?
