My new 90 vert decided not to idle anymore. It was running fine at first. Then when I moved it off the trailer and parked it in the driveway and left it running for a while it started 'searching for idle. it would hunt rapidly up and down between about 500-1000 rpm's. I got in hit and hit the trottle a few times to see if that would clear it up. When I would push the accelerator it kinda sounded like it was pinging when I first hit it. After doing that a few times it would still search for idle but it would stay running. I shut it off and moved things around in the garage so I could put it away. When I started it back up it just dies right away.I can get it to run if I hold the throttle open a bit but as soon as I take my foot off the gas it just dies. I 'two-footed' it and put her in the garage. I have looked at a few things but nothing jumps out at me. I replaced the tps with another that I had but still same thing. I was suspecting the iac but I would think the bas idle would kick in and keep it running. I haven't removed the tb to clean it yet although I did spray some cleaner into the tb.

Hopefully I will get time to pull the throttle body off and give it a cleaning and check the iac. I do hear the iac moving after I shut it down. The car has been sitting for about a year and only started occasionally. Could the gas be bad? Would it help to get octane boost or injector cleaner to put in the tank? It's about half full. I did check the fuel pressure and it is about 32 psi not running and it holds pressure pretty good once it shuts off.

Any help would be appreciated. I have not work on a speed density car before. Thay have all been maf ones.

Thanks.

 

welcome to the world of ecm controlled fuel injection. any mods? excluding the air foil as i tend to think changing a light bulb will produce more results.

 

No mods that I know of. Just got the car. Haven't even removed the frisbee yet. I have an 85 allready. Just about everything is different between the two cars since one is maf and the other sd.

 

Sitting for a year? I hope they drained the gas.....if not, then could be fuel filter or fuel pump.

 

Seems to be the fuel filter. Changed it (what a PITA) and now she idles fine.

 

http://forums.corvetteforum.com/show...50&forum_id=48

 

Check your ECT sensor.I suppose it could be bad gas put some ISO Heet in it and shake it How full is the tank?

OOps posted late but I would still put the Heet in just in case if the gas is old.

 

I hooked my fp gauge up and I was only getting 32 psi when I turned the key on. I didn't start it too see if it would go any higher but I went ahead and replaced the fuel filter. It was on $7 from Autozone. Had to drop the X frame down to get the filter clamp bolt back on.

 

And did you get higher FP numbers?