99 vette throwing p0300 and p0410 codes..

**MachWon** · 03-04-2010, 07:26 PM

Ok so I did some research on here before posting this. I recently had the entire engine redone, trick flow heads, cam, rockers, fast 92 intake, 90mm tb, 85 mm maf, long tubes. I am STILL running factory injectors unfortunatley and when the car was tuned the injectors ran as high as 126% duty cycle at wot. Now I have a A/F ratio gauge and I have been monitoring that and it seems to be ok even at wot but the power seems to be intermittent at wot at high rpms. I think my injectors are hosed and that is what is throwing the P0300 misfire code. Anyone else care to give their 2 cents?

**0rion** · 03-04-2010, 07:31 PM

what size cam do you have and 126% IDC is bad.....p0410 is for your a.i.r. system. Is that still on the car?

**farmtruc** · 03-05-2010, 04:22 PM

Since your car has heads and cam, the P300 code should have been turned off, or the misfire count maxed out. So that's just probably an oversight from the tuner.
Have him turn that code off.
Since you have all the mods above, you probably have aftermarket headers, which probably didn't come with AIR inj provisions, at least nobody connects it when doing heads/cam.
Just have the codes turned off or fixed and get some new injectors.
The Lucas 48lb @ 58psi injectors are just right for your setup, if fuel pressure is good.

**MachWon** · 03-06-2010, 01:20 AM

I got the kooks 1 7/8" long tubes on it. No air pump provision on them cuz they are the off road ones. Still got the air pump on the car but plugged the line off. I got the 37lb racetronix injectors waiting to be put on but my tuner is having difficulty finding the voltage and flow data for them.