Starting problem.

**cntrhub** · 06-03-08, 11:51 AM

If it starts right up cold in the morning, where is the air leak? Where is the clogged part that is causing a hard start? Would not a clogged air cleaner run the engine rich in the warm start? That would mean fuel is getting to the cylinder? You had to push on the pedal to start on a hot day? Does that mean more air because you have to match the over rich condition?

How much over-rich is that on cold start-up where it works and starts fine. You might be chasing your tail is more the TPS on the throttle app. I doubt it since it starts so well cold.
You have a plug in the correct heat range? You have the plug gap past spec or under spec? If cold telemetry starts well enough needing that rich map in the morning is the ECU has captured the water temp, the TPS and all is ready to fire.

Air cleaner or plug change is might be something as setting a higher idle adjust and you are done pulling off parts that work fine in the morning start.

**Paul Higg** · 06-03-08, 12:48 PM

Thanks Jake, but since this thread has been going for a while, could you be a little more specific? Which intake are you talking about? The IAC or the EGR?

Paul

**Paul Higg** · 06-03-08, 12:52 PM

Originally Posted by cntrhub

If it starts right up cold in the morning, where is the air leak? Where is the clogged part that is causing a hard start? Would not a clogged air cleaner run the engine rich in the warm start? That would mean fuel is getting to the cylinder? You had to push on the pedal to start on a hot day? Does that mean more air because you have to match the over rich condition?

How much over-rich is that on cold start-up where it works and starts fine. You might be chasing your tail is more the TPS on the throttle app. I doubt it since it starts so well cold.
You have a plug in the correct heat range? You have the plug gap past spec or under spec? If cold telemetry starts well enough needing that rich map in the morning is the ECU has captured the water temp, the TPS and all is ready to fire.

Air cleaner or plug change is might be something as setting a higher idle adjust and you are done pulling off parts that work fine in the morning start.

I do not know if the plugs are in the correct heat range because I have never had them out. I just bought the car in January so I do not know what maintenance was done on it. One thing I have noticed is that if I turn the key to run and let the fuel pump run for three seconds it will start right up. So I think it may be fuel pressure related. And from what I have read changing the plugs can be a real nightmare so I am going to have my mechanic do it soon. He's been overhauling just Vettes for 32 years. He does good work and I trust him.

**Toms01** · 06-03-08, 01:29 PM

Dang Paul, I wish I lived closer, I could help you do that plug change. I am guessing that you are correct in thinking it might a be a fuel pressure issue.