runs bad
Thread Starter
5th Gear
Joined: May 2008
Posts: 5
Likes: 0
From: centralia wa
runs bad
well i have a 88 4+3 vette well the first Q the car is a little hard to start in the morning but starts fine when warm if you dont let the car warm up it backfires through the intake. the 2nd Q is the car while driving will act like it lost all power and you work the gas it is like it wants to work in one spot and if you floor it it backfires and spuders .this problen happens and no service light comes on. i have chaged the ecm egr plugs wires cap roter the electronic thing under the roter.the fule pressuer was checked by a shop they dont know what to do.it does have ne fuel inj.got them from this site.tps was changed and set.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
A couple of things - If it has a Cold Start Injector, you'll need to make sure it's firing when cold. Otherwise the Coolant Temp Sensor is your Choke - you need to see what it's telling the ECM when the engine is cold - preferably after it's sat overnight. The only way to do that is with a scanner, but you could throw 12 Bucks at a new one. There's no need to install it. Just disconnect the old one and plug the harness into the new one. If it starts ok, the sensor is the problem. If not, there's still a possiblity that it's the wiring or the ECM and you're going to have to hookup a scanner to figure it out.
